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Xu Z, Dong W, Cui X, Duan Q. Three-dimensional donor-acceptor conjugated porous polymers based on metal-porphyrin and triazine for highly effective photodegradation of organic pollutants in water. Chemosphere 2024; 355:141801. [PMID: 38552804 DOI: 10.1016/j.chemosphere.2024.141801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 03/04/2024] [Accepted: 03/24/2024] [Indexed: 04/01/2024]
Abstract
Three-dimensional donor-acceptor (D-A) type conjugated porous polymers (CPPs) was designed and synthesized via imine condensation of copper tetraaminoporphyrin (CuTAPP) as donor and 1,3,5-tris-(4-formyl phenyl) triazine (TFPT) as acceptor, named as CuPT-CPP. The CuPT-CPP possesses a high specific surface area (73.7 m2/g) and excellent photophysical properties. The simultaneous introduction of the organometallic molecules and D-A structures in CuPT-CPP could be broadened the visible-light response range (400-800 nm) and facilitated efficient photogenerated carrier separation and transportation. As heterogeneous photocatalysts, CuPT-CPP has excellent photocatalytic performances under visible light irradiation, leading to excellent model pollutant rhodamine B degradation efficiency up to about 100% in 3 h, it has superb stability and reusability during the photocatalytic processes, and CuPT-CPP also exhibited broad substrate adaptability, which could photocatalytic degradation of methylene blue (MB), methyl orange (MO), and tetracycline hydrochloride (TC). This work indicates that three-dimensional D-A type porphyrin- and triazine-based CuPT-CPP has great potential in the practical application of photocatalysis.
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Affiliation(s)
- Zhilin Xu
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, 130022, China
| | - Wenyue Dong
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, 130022, China
| | - Xu Cui
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, 130022, China; Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun, 130022, China.
| | - Qian Duan
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, 130022, China; Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun, 130022, China.
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2
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Imtiaz F, Rashid J, Kumar R, Eniola JO, Barakat MAEF, Xu M. Recent advances in visible light driven inactivation of bloom forming blue-green algae using novel nano-composites: Mechanism, efficiency and fabrication approaches. Environ Res 2024; 248:118251. [PMID: 38278506 DOI: 10.1016/j.envres.2024.118251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 12/21/2023] [Accepted: 01/07/2024] [Indexed: 01/28/2024]
Abstract
Over the years, algae have proved to be a water pollutant due to global warming, climate change, and the unregulated addition of organic compounds in water bodies from diffused resources. Harmful algal blooms (HABs) are severely affecting the health of humans and aquatic ecosystems. Among available anti-blooming technologies, semiconductor photocatalysis has come forth as an effective alternative. In the recent past, literature has been modified extensively with a decisive knowledge regarding algal invasion, desired preparation of nanomaterials with enhanced visible light absorption capacity and mechanisms for algal cell denaturation. The motivation behind this review article was to gather algal inactivation data in a systematic way based on various research studies, including the construction of nanoparticles and purposely to test their anti-algal activities under visible irradiation. Additionally, this article mentions variety of starting materials employed for preparation of various nano-powders with focus on their synthesis routes, analytical techniques as well as proposed mechanisms for lost cellular integrity in context of reduced chlorophyll' a' level, cell rapture, cell leakage and damages to other physiological constituents; credited to oxidative damage initiated by reactive oxidation species (ROS). Various floating and recyclable composited catalysts Ag2CO3-N: GO, Ag/AgCl@ZIF-8, Ag2CrO4-g-C3N4-TiO2/mEP proved to be game-changers owing to their enhanced VL absorption, adsorption, stability, separation and reusability. An outlook for the generalized limitations of published reports, cost estimations for practical implementation, issues and challenges faced by nano-photocatalysts and possible opportunities for future studies are also proposed. This review will be able to provide vast insights for coherent fabrication of catalysts, breakthroughs in experimental methodologies and help in elaboration of damage mechanisms.
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Affiliation(s)
- Fatima Imtiaz
- Department of Environmental Sciences, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, 45320, Pakistan
| | - Jamshaid Rashid
- Department of Environmental Sciences, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, 45320, Pakistan; BNU-HKUST Laboratory for Green Innovation, Advanced Institute of Natural Sciences, Beijing Normal University at Zhuhai, Zhuhai, 519087, China.
| | - Rajeev Kumar
- Department of Environment, Faculty of Environmental Sciences, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Jamiu O Eniola
- Department of Environment, Faculty of Environmental Sciences, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Mohamed Abou El-Fetouh Barakat
- Department of Environment, Faculty of Environmental Sciences, King Abdulaziz University, Jeddah 21589, Saudi Arabia; Central Metallurgical R & D Institute, Helwan, 11421, Cairo, Egypt
| | - Ming Xu
- BNU-HKUST Laboratory for Green Innovation, Advanced Institute of Natural Sciences, Beijing Normal University at Zhuhai, Zhuhai, 519087, China.
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Janani FZ, Khiar H, Taoufik N, Sadiq M, Favier L, Ezzat AO, Elhalil A, Barka N. Mn 3O 4/ZnO-Al 2O 3-CeO 2 mixed oxide catalyst derived from Mn-doped Zn-(Al/Ce)-LDHs: efficient visible light photodegradation of clofibric acid in water. Environ Sci Pollut Res Int 2024; 31:25373-25387. [PMID: 38472583 DOI: 10.1007/s11356-024-32841-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Accepted: 03/06/2024] [Indexed: 03/14/2024]
Abstract
Mn3O4/ZnO-Al2O3-CeO2 catalyst was synthesized through a solid-state process from a 3% Mn-doped Zn-(Al/Ce) layered double hydroxide structure. Detailed structural and optical characterization using XRD, FTIR, UV-visible DRS, and TEM was conducted. By investigating clofibric acid (CA) degradation in aqueous solution, Mn3O4/ZnO-Al2O3-CeO2 photocatalytic activity was evaluated. The results show that the heterostructure mixed oxide catalyst has excellent CA photodegradation performance. Further, the characterization reveals that such photocatalytic efficiency can be attributed to two facts that are summarized in the optical properties and the synergic effect between Mn and Ce elements. The sample demonstrated a narrow band gap of 2.34 eV based on DRS. According to the experimental results of the photodegradation, after 120 min of irradiation, the photocatalyst exhibited the highest photocatalytic activity, with a degradation efficiency of 93.6%. Optimization outcomes indicated that maximum degradation efficiency was attained under the following optimum conditions: catalyst dose of 0.3 g/L, initial dye concentration of 20 mg/L, pH 3.86, and 120 min of reaction time. The quenching test demonstrates that photogenerated electrons and superoxide radicals are the most powerful reactive species. The catalyst could be useful in decreasing the photogenerated charges recombination, which offers more redox cycles simultaneously during the catalytic process. The strong Ce-Mn interaction and the formation of their different oxidation states offer a high degradation efficiency by facilitating electron-hole transfer. The introduction of Mn3O4 in the catalyst can effectively improve the visible absorption properties, which are beneficial in the photocatalytic process by reaching a high catalytic efficiency at a low cost.
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Affiliation(s)
- Fatima Zahra Janani
- Multidisciplinary Research and Innovation Laboratory, Sultan Moulay Slimane University of Beni Mellal, FP Khouribga, BP.145, 2500, Khouribga, Morocco
| | - Habiba Khiar
- Multidisciplinary Research and Innovation Laboratory, Sultan Moulay Slimane University of Beni Mellal, FP Khouribga, BP.145, 2500, Khouribga, Morocco
| | - Nawal Taoufik
- Multidisciplinary Research and Innovation Laboratory, Sultan Moulay Slimane University of Beni Mellal, FP Khouribga, BP.145, 2500, Khouribga, Morocco
| | - Mhamed Sadiq
- Multidisciplinary Research and Innovation Laboratory, Sultan Moulay Slimane University of Beni Mellal, FP Khouribga, BP.145, 2500, Khouribga, Morocco
| | - Lidia Favier
- Univ Rennes, Ecole Nationale Supérieure de Chimie de Rennes, CNRS, ISCR-UMR 6226, F-35000, Rennes, France
| | - Abdelrahman Osama Ezzat
- Department of Chemistry, College of Sciences, King Saud University, 11451, Riyadh, Saudi Arabia
| | - Alaâeddine Elhalil
- Laboratory of Process and Environmental Engineering, Higher School of Technology, Hassan II University of Casablanca, Casablanca, Morocco
| | - Noureddine Barka
- Multidisciplinary Research and Innovation Laboratory, Sultan Moulay Slimane University of Beni Mellal, FP Khouribga, BP.145, 2500, Khouribga, Morocco.
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Bhava A, Shenoy US, Bhat DK. Silver doped barium titanate nanoparticles for enhanced visible light photocatalytic degradation of dyes. Environ Pollut 2024; 344:123430. [PMID: 38281571 DOI: 10.1016/j.envpol.2024.123430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Revised: 01/01/2024] [Accepted: 01/21/2024] [Indexed: 01/30/2024]
Abstract
Due to the rapid growth of global population, new, fast and reliable methods must be developed to purify contaminated water. Various photocatalysts have been developed to remove organic dyes from water. Herein, Ag doped BaTiO3 has been synthesized using a facile solvothermal method and its excellent photocatalytic activities were demonstrated in degradation of both anionic and cationic dyes under visible light illumination. Ag doped BaTiO3 nanoparticles showed greater efficacy in the degradation of methylene blue (MB) and eosin yellow (EY) than undoped BaTiO3 nanoparticles, which makes them a better candidate for photocatalysis. 1.0 AgBT sample showed the highest photocatalytic activity for MB (99.1 % in 100 min) and EY (99.3 % in 60 min) dye degradation compared with those of other samples. Further, the trapping experiments revealed that hydroxyl radicals and holes are the active species in the photocatalytic process of MB and EY dye degradation and recycle test showed excellent stability of the synthesized material.
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Affiliation(s)
- A Bhava
- Department of Chemistry, National Institute of Technology Karnataka, Surathkal, Mangalore, 575025, India
| | - U Sandhya Shenoy
- Department of Material Science and Engineering, Institute of Engineering and Technology, Srinivas University, Mukka, Mangalore, 574146, India
| | - D Krishna Bhat
- Department of Chemistry, National Institute of Technology Karnataka, Surathkal, Mangalore, 575025, India.
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Sánchez-Silva JM, Ojeda-Galván HJ, Villabona-Leal EG, Labrada-Delgado GJ, Aguilar-Maruri SA, Fuentes-Ramírez R, González-Ortega O, López-Ramón MV, Ocampo-Pérez R. Synergistic photocatalysis of a hydrochar/CeO 2 composite for dye degradation under visible light. Environ Sci Pollut Res Int 2024; 31:16453-16472. [PMID: 38321273 DOI: 10.1007/s11356-024-32281-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Accepted: 01/27/2024] [Indexed: 02/08/2024]
Abstract
The synthesis and characterization of a hydrochar/CeO2 composite along with its evaluation in methylene blue degradation under visible light are presented. The methodology consisted of a single-pass hydrothermal method, having as synthesis conditions 9 h of reaction time, 210 °C, autogenous pressure, and a biomass/CeO2 ratio of 100:1. The composite characterization revealed good dispersion of CeO2 in the carbonaceous matrix and significant synergy in the composite activation using visible irradiation. The photodegradation experiments showed an efficiency of 98% for white LED light, 91% for UV light, 96% for solar irradiation, and 85% for blue LED light using as conditions pH 7.0, 50 mg of composite, 50 mL of solution, 10 mg/L of dye initial concentration, and 120 min of contact time. Meanwhile, the reusability experiments evidenced a reuse capacity of up to five times with a constant photodegradation efficiency (99%); moreover, it was determined that the presence of electrolytes at pH below 7.0 during degradation negatively affected methylene blue degradation. Finally, the results of this work demonstrate that the hydrochar/CeO2 composite can be synthesized by a green method and used for the efficient treatment of water contaminated with methylene blue.
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Affiliation(s)
- Jonathan Michel Sánchez-Silva
- Centro de Investigación y Estudios de Posgrado, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, 78260, San Luis Potosí, Mexico
| | - Hiram Joazet Ojeda-Galván
- Centro de Investigación en Ciencias de la Salud y Biomedicina (CICSAB), Universidad Autónoma de San Luis Potosí, 78210, San Luis Potosí, Mexico
| | - Edgar Giovanny Villabona-Leal
- Centro de Investigación en Ciencias de la Salud y Biomedicina (CICSAB), Universidad Autónoma de San Luis Potosí, 78210, San Luis Potosí, Mexico
| | | | - Saul Alejandro Aguilar-Maruri
- Centro de Investigación y Estudios de Posgrado, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, 78260, San Luis Potosí, Mexico
| | | | - Omar González-Ortega
- Centro de Investigación y Estudios de Posgrado, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, 78260, San Luis Potosí, Mexico
- Centro de Investigación en Ciencias de la Salud y Biomedicina (CICSAB), Universidad Autónoma de San Luis Potosí, 78210, San Luis Potosí, Mexico
| | - María Victoria López-Ramón
- Departamento de Química Inorgánica y Orgánica, Facultad de Ciencias Experimentales, Universidad de Jaén, 23071, Jaén, Spain
| | - Raúl Ocampo-Pérez
- Centro de Investigación y Estudios de Posgrado, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, 78260, San Luis Potosí, Mexico.
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6
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Dewa H, Yoda K, Mine S, Wang ZM, Sano T, Koura S. Utilization of waste beverages for achieving carbon-based core-shell nanostructures of high visible light photocatalytic performance. J Environ Manage 2024; 354:120353. [PMID: 38377756 DOI: 10.1016/j.jenvman.2024.120353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 01/09/2024] [Accepted: 02/08/2024] [Indexed: 02/22/2024]
Abstract
Waste beverages are utilized as resources in various valuable, albeit energy-consuming, waste-to-energy processes. There is a growing need for alternative cost-effective methods to harness their potential. This study explored the feasibility of employing waste beverages as feedstock for the counterpart component of a TiO2-based composite photocatalyst. Several commonly available carbonated soft drinks from the Japanese market have been investigated to achieve this goal. The investigation revealed that a mild hydrothermal treatment condition could transform all examined beverages into carbonaceous materials suitable for fabricating a core-shell structure with TiO2, resulting in a remarkably efficient visible light active photocatalyst. Notably, a pH-adjusted photocatalyst derived from Coca Cola® exhibited superior visible light photodegradability toward dye molecules and enhanced bactericidal efficacy compared to the counterpart derived from pure sucrose. The heightened visible light photocatalytic activity can be attributed to the distinctive carboxy-rich surface functional groups, based on the findings of experimental analyses and density functional theory calculations. The bidentate-type bonding of these groups with TiO2 induces a modified interfacial bond structure that facilitates the efficient transfer of photoexcited carriers. This study presents a novel avenue for the effective utilization and recycling of waste beverages, and adds value under environmentally benign conditions.
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Affiliation(s)
- Hideki Dewa
- National Institute of Advanced Industrial Science and Technology, Environmental Management Research Institute, Onogawa 16-1, Tsukuba, Ibaraki, 305-8568, Japan; Department of Applied Chemistry, Chiba Institute of Technology, Chiba, 275-0016, Japan
| | - Kazumasa Yoda
- National Institute of Advanced Industrial Science and Technology, Environmental Management Research Institute, Onogawa 16-1, Tsukuba, Ibaraki, 305-8568, Japan; Department of Applied Chemistry, Chiba Institute of Technology, Chiba, 275-0016, Japan
| | - Shinya Mine
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo, 001-0021, Japan; National Institute of Advanced Industrial Science and Technology, Research Institute for Chemical Process, Nigadake 4-2-1, Miyagino-ku, Sendai, 983-8551, Japan
| | - Zheng-Ming Wang
- National Institute of Advanced Industrial Science and Technology, Environmental Management Research Institute, Onogawa 16-1, Tsukuba, Ibaraki, 305-8568, Japan.
| | - Taizo Sano
- National Institute of Advanced Industrial Science and Technology, Environmental Management Research Institute, Onogawa 16-1, Tsukuba, Ibaraki, 305-8568, Japan
| | - Setsuko Koura
- Department of Applied Chemistry, Chiba Institute of Technology, Chiba, 275-0016, Japan
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Wang X, Wang J, Liu S, Dou M, Gao B. Sterilization mechanism and nanotoxicity of visible light-driven defective carbon nitride and UV-excited TiO 2. J Hazard Mater 2024; 461:132109. [PMID: 37734307 DOI: 10.1016/j.jhazmat.2023.132109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 07/05/2023] [Accepted: 07/19/2023] [Indexed: 09/23/2023]
Abstract
The sterilization effect of photocatalysis and biotoxicity of nanomaterial catalysts have attracted high attention. In this study, the novel visible-driven defective carbon nitride (VL/DCN) system exhibits non-photoreactivation, non-toxic superior performance compared with traditional ultraviolet radiation (UV) and UV/titanium dioxide (UV/TiO2). The inactivation of antibiotic-resistant bacteria (ARB) by novel VL/DCN still reached 7 log within 4 h, and the reduction rates of aminoglycoside gene strB and tetracycline gene tetA exceeded 0.8 log and 1.2 log, respectively. Further, the sterilization mechanism and nanotoxicity were contrastively and systematically analyzed among above three systems as following. Firstly, in the VL/DCN system, reactive oxygen species (ROSs) generated from photocatalytic process leads to the destruction of cell membranes, resulting in dissolving out of potassium ion (K+), protein and cell membrane ATP content. Thus, resistant bacteria were completely inactivated and photoreactivation disappears. In contrast, the UV only acted on bacterial DNA and existed the light resurrection. The UV/TiO2 strictly dependent on ultraviolet light and can be used in limited scenarios. Secondly, in cell viability analysis by human lung cell line BEAS-2B experiments, the 10% inhibition of cell growth when DCN was 600 mg/L much lower than 28% inhibition of cell growth when TiO2 was only 200 mg/L. The expression of pro-inflammatory cytokines ((Interleukin, IL) -6), IL-8, IL-1β) under the effect of DCN was 1.5-fold, 5.7-fold and 3.7-fold lower than TiO2, respectively. Meanwhile, DCN induced cells to produce less ROSs, malondialdehyde (MDA), and more superoxide dismutase (SOD). Above results demonstrated that DCN has far lower cytotoxicity than TiO2. This study provides theoretical support for the application of photocatalytic sterilization technology and the exploration of the toxicity of nanomaterials.
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Affiliation(s)
- Xiaoyue Wang
- Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Environment, Beijing Jiaotong University, Haidian District, Beijing 100044, China
| | - Jin Wang
- Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Environment, Beijing Jiaotong University, Haidian District, Beijing 100044, China.
| | - Shanjun Liu
- Jinan Environmental Research Academy, Jinan 250102, China
| | - Mengmeng Dou
- Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Environment, Beijing Jiaotong University, Haidian District, Beijing 100044, China
| | - Boru Gao
- China International Engineering Consulting Corporation, Beijing 100048, China
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Sharma S, Devi B, Koiri D, Sharma K, Bhattacharyya KG, Devi A. Visible light photocatalytic degradation of methylene blue and rhodamine B over silver-doped titanium dioxide nanocomposites supported on Fuller's earth. Environ Monit Assess 2023; 195:1362. [PMID: 37872312 DOI: 10.1007/s10661-023-11981-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Accepted: 10/12/2023] [Indexed: 10/25/2023]
Abstract
Silver-doped-titanium dioxide nanoparticles supported on Fuller's earth, prepared by the sol-gel method, were characterized with XRD, TGA, zeta potential, SEM, EDX, TEM, XPS, photoluminescence and UV-DRS measurements. The material, Ag-TiO2-Fuller's earth (AgTF), was tested for photocatalytic activity concerning the degradation of rhodamine B (RhB) and methylene blue (MB) in aqueous solution under visible light irradiation with pH, catalyst dosage, and dye concentration as the process variables. The degradation kinetics indicated pseudo-first-order kinetics with rate constant of (i) 0.55 min-1with 0.12 gL-1AgTF loading, 10-5 M MB at pH 9, and (ii) 0.53 min-1 with 0.08 g L-1 AgTF loading, 5 × 10-5 M RhB at pH 8. The methylene blue degradation was maximum (98.66%) for AgTF loading of 0.12 g L-1 while the maximum RhB degradation (96.34%) was attained with AgTF loading of 0.08 g L-1. With 5 × 10-6M MB concentration, the degradation achieved was 98% in 45 min and 100% in 60 min. One hundred per cent degradation of the dye, RhB (1 × 10-6 M) could be achieved in 30 min with 0.08 g L-1 AgTF at pH 8. The use of Fuller's earth, a cheap, abundant and large surface area support, increases the adsorbability of the dye on the catalyst surface and hence promotes the degradation. The catalyst could be removed easily from the reaction mixture and reused for up to five cycles without any significant decrease in activity. Scavengers such as triethanolamine (TEOA), p-benzoquinone (BQ) and isopropyl alcohol (IPA) were utilized to get some insight into the photocatalysis mechanism.
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Affiliation(s)
- Sudeshna Sharma
- Environmental Chemistry Laboratory, Resource Management and Environment Section, Life Sciences Division, Institute of Advanced Study in Science and Technology (IASST), Guwahati, Assam, 781035, India
| | - Bhaswati Devi
- Environmental Chemistry Laboratory, Resource Management and Environment Section, Life Sciences Division, Institute of Advanced Study in Science and Technology (IASST), Guwahati, Assam, 781035, India
| | - Dibyajyoti Koiri
- Environmental Chemistry Laboratory, Resource Management and Environment Section, Life Sciences Division, Institute of Advanced Study in Science and Technology (IASST), Guwahati, Assam, 781035, India
| | - Khanindra Sharma
- Environmental Chemistry Laboratory, Resource Management and Environment Section, Life Sciences Division, Institute of Advanced Study in Science and Technology (IASST), Guwahati, Assam, 781035, India
| | | | - Arundhuti Devi
- Environmental Chemistry Laboratory, Resource Management and Environment Section, Life Sciences Division, Institute of Advanced Study in Science and Technology (IASST), Guwahati, Assam, 781035, India.
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Sánchez-Silva JM, Aguilar-Aguilar A, Labrada-Delgado GJ, Villabona-Leal EG, Ojeda-Galván HJ, Sánchez-García JL, Collins-Martínez H, López-Ramón MV, Ocampo-Pérez R. Hydrothermal synthesis of a photocatalyst based on Byrsonima crassifolia and TiO 2 for degradation of crystal violet by UV and visible radiation. Environ Res 2023; 231:116280. [PMID: 37257742 DOI: 10.1016/j.envres.2023.116280] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 05/24/2023] [Accepted: 05/28/2023] [Indexed: 06/02/2023]
Abstract
This work presents a one-step synthesis methodology for preparing a hydrochar (HC) doped with TiO2 (HC-TiO2) for its application on the degradation of crystal violet (CV) using UV and visible radiation. Byrsonima crassifolia stones were used as precursors along with TiO2 particles. The HC-TiO2 sample was synthesized at 210 °C for 9 h using autogenous pressure. The photocatalyst was characterized to evaluate the TiO2 dispersion, specific surface area, graphitization degree, and band-gap value. Finally, the degradation of CV was investigated by varying the operating conditions of the system, the reuse of the catalyst, and the degradation mechanism. The physicochemical characterization of the HC-TiO2 composite showed good dispersion of TiO2 in the carbonaceous particle. The presence of TiO2 on the hydrochar surface yields a bandgap value of 1.17 eV, enhancing photocatalyst activation with visible radiation. The degradation results evidenced a synergistic effect with both types of radiation due to the hybridized π electrons in the sp2-hybridized structures in the HC surface. The degradation percentages were on average 20% higher using UV radiation than visible radiation under the following conditions: [CV] = 20 mg/L, 1 g/L of photocatalyst load, and pH = 7.0. The reusability experiments demonstrated the feasibility of reusing the HC-TiO2 material up to 5 times with a similar photodegradation percentage. Finally, the results indicated that the HC-TiO2 composite could be considered an efficient material for the photocatalytic treatment of water contaminated with CV.
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Affiliation(s)
- J M Sánchez-Silva
- Centro de Investigación y Estudios de Posgrado, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí, 78260, Mexico
| | - A Aguilar-Aguilar
- Centro de Investigación y Estudios de Posgrado, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí, 78260, Mexico
| | | | - E G Villabona-Leal
- Centro de Investigación en Ciencias de la Salud y Biomedicina (CICSAB), Universidad Autónoma de San Luis Potosí, San Luis Potosí, 78210, Mexico
| | - H J Ojeda-Galván
- Centro de Investigación en Ciencias de la Salud y Biomedicina (CICSAB), Universidad Autónoma de San Luis Potosí, San Luis Potosí, 78210, Mexico
| | - J L Sánchez-García
- Centro de Investigación y Estudios de Posgrado, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí, 78260, Mexico
| | - H Collins-Martínez
- Ingeniería y Química de Materiales, Centro de Investigación en Materiales Avanzados, S.C, Chihuahua, 31136, Mexico
| | - M V López-Ramón
- Departamento de Química Inorgánica y Orgánica, Facultad de Ciencias Experimentales, Universidad de Jaén, Jaén, 23071, Spain
| | - R Ocampo-Pérez
- Centro de Investigación y Estudios de Posgrado, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosí, 78260, Mexico.
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Javan Mahjoub Doust F, Sharafi K, Jaafari J. Novel fabrication of the recyclable Bi 7O 9I 3/chitosan and BiOI/chitosan heterostructure with improved photocatalytic activity for degradation of dimethyl phthalate under visible light. Environ Sci Pollut Res Int 2023:10.1007/s11356-023-27935-w. [PMID: 37280488 DOI: 10.1007/s11356-023-27935-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Accepted: 05/20/2023] [Indexed: 06/08/2023]
Abstract
Among the bismuth oxyhalides, bismuth oxide has the shortest band gap and high absorption power in the visible light region. Dimethyl phthalate (DMP) has been identified as endocrine-disrupting plasticizer and emerging pollutant, which was selected as the target pollutant to evaluate the efficacy of the studied catalytic process. In this work, Bi7O9I3/chitosan and BiOI/chitosan were efficaciously synthesized by the hydrothermal process method. Characterizing prepared photocatalysts was done by employing transmission electron microscopy, X-ray diffraction, scanning electron microscopy energy-dispersive spectroscopy, and diffuse reflectance spectroscopy. For this study, the test design was performed using the Box-Behnken Design (BBD) method in which the variables of pH, Bi7O9I3/chitosan dose, and dimethyl phthalate concentration were examined for the catalytic removal of dimethyl phthalate in the presence of visible light. Our detected results disclosed that the order of efficiency in DMP removal was as follows: Bi7O9I3/chitosan > BiOI/chitosan > Bi7O9I3 > BiOI. Also, the maximum pseudo-first-order kinetic coefficient for Bi7O9I3/chitosan was 0.021 (min)-1. When the synthesized catalysts were exposed to visible light irradiation, the predominant active species were O2- and h+ for degradation of DMP. The study on the reuse of Bi7O9I3/chitosan showed that this catalyst could be reused 5 times without significant reduction in efficiency, which indicates the cost-effectiveness and environmental friendliness of using this catalyst.
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Affiliation(s)
- Fatemeh Javan Mahjoub Doust
- Department of Environmental Health Engineering, School of Health, Guilan University of Medical Sciences, Rasht, Iran
| | - Kiomars Sharafi
- Research Center for Environmental Determinants of Health (RCEDH), Research Institute for Health, Kermanshah University of Medical Sciences, Kermanshah, Iran
- Department of Environmental Health Engineering, School of Public Health, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Jalil Jaafari
- Department of Environmental Health Engineering, Research Center of Health and Environment, School of Health, Guilan University of Medical Sciences, Rasht, Iran.
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11
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Wang Y, Chen J, Yang J, Jiao Z, Su CY. Elaborating E/Z-Geometry of Alkenes via Cage-Confined Arylation Catalysis of Terminal Olefins. Angew Chem Int Ed Engl 2023:e202303288. [PMID: 37060207 DOI: 10.1002/anie.202303288] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 04/13/2023] [Accepted: 04/14/2023] [Indexed: 04/16/2023]
Abstract
A visible light photosensitizing metal-organic cage is applied as an artificial supramolecular reactor to control the reaction of aryl radicals with terminal olefins under green light/solvent conditions, which facilitates selective transformation in the confined enzyme-mimicking environment to give a series of geometrically defined E/Z-alkenes. The hydrophobic cage displays good host-guest inclusion with aromatic substrates, promoting Meerwein arylation and protecting E-isomeric products during reaction; while a small amount of benzonitrile can turn on efficient E→Z isomerization. Besides π-π stacking, the hydrogen bonding and halogen bonding interactions also act as control forces for the arylation of aliphatic terminal olefins known as poor acceptors in classic Meerwein arylation. The application of this switchable cage-confined arylation catalysis has been demonstrated by the syntheses of Tapinarof and a marine natural product from the same substrate via controllable E/Z selectivity.
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Affiliation(s)
- Yuanfan Wang
- Sun Yat-Sen University, Shcool of Chemsitry, CHINA
| | - Jie Chen
- Sun Yat-Sen University, Shcool of Chemsitry, CHINA
| | - Jie Yang
- Sun Yat-Sen University, Shcool of Chemsitry, CHINA
| | - Zhiwei Jiao
- Sun Yat-Sen University, Shcool of Chemsitry, CHINA
| | - Cheng-Yong Su
- Sun Yat-Sen University, School of Chemistry and Chemical Engineering, 135 Xingang West Rd, 510275, Guangzhou, CHINA
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12
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Sun S, Yang J, Liu Y, Xie Y, Mwabulili F. Porous Graphitic phase carbon nitride/graphene oxide hydrogel microspheres for efficient and recyclable degradation of aflatoxin B 1 in peanut oil. Food Chem 2023; 417:135964. [PMID: 36934709 DOI: 10.1016/j.foodchem.2023.135964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 03/12/2023] [Accepted: 03/13/2023] [Indexed: 03/17/2023]
Abstract
Removal of aflatoxin is an urgent issue in agricultural products. A porous graphitic carbon nitride/graphene oxide hydrogel microsphere (CN/GO/SA) was synthesized and used to degrade AFB1 in peanut oil. CN/GO/SA was characterized by scanning electron micrograph (SEM), X-ray diffraction (XRD) and FT-IR. The introduction of GO significantly improved the adsorption capacity and visible light activity of photocatalysts. About 98.4% AFB1 in peanut oil was removed by 20% CN/GO/SA under visible light for 120 min. ‧O2- and h+ were the main active species during photoreaction, and five degradation products were identified by UPLC-Q-Orbitrap MS analysis. At the same time, the quality of treated peanut oil was still acceptable. More importantly, CN/GO/SA showed excellent cycle stability, and the degradation rate of AFB1 in peanut oil remained above 95% after five-time recycling. This work provides a practical way for developing efficient and sustainable photocatalysts to degrade mycotoxins in edible oil.
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Affiliation(s)
- Shumin Sun
- College of Food Science and Technology, Henan Key Laboratory of Cereal and Oil Food Safety Inspection and Control, Henan University of Technology, Lianhua Street, Zhengzhou 450001, China
| | - Jiayi Yang
- College of Food Science and Technology, Henan Key Laboratory of Cereal and Oil Food Safety Inspection and Control, Henan University of Technology, Lianhua Street, Zhengzhou 450001, China
| | - Yajie Liu
- College of Food Science and Technology, Henan Key Laboratory of Cereal and Oil Food Safety Inspection and Control, Henan University of Technology, Lianhua Street, Zhengzhou 450001, China
| | - Yanli Xie
- College of Food Science and Technology, Henan Key Laboratory of Cereal and Oil Food Safety Inspection and Control, Henan University of Technology, Lianhua Street, Zhengzhou 450001, China.
| | - Fred Mwabulili
- College of Food Science and Technology, Henan Key Laboratory of Cereal and Oil Food Safety Inspection and Control, Henan University of Technology, Lianhua Street, Zhengzhou 450001, China
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13
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Cui Y, Ye Q, Wang H, Duo X, Peng L, Dong W, Cui X, Lu Y, Li Y. Photocatalytic and oxidation mechanisms of Fe-Ag@AgCl: Effect on co-existing arsenic (III) and Escherichia coli. Environ Res 2023; 217:114913. [PMID: 36427633 DOI: 10.1016/j.envres.2022.114913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 11/17/2022] [Accepted: 11/21/2022] [Indexed: 06/16/2023]
Abstract
To address the drinking safety problems associated with high arsenic(III) (As(III)) and bacteria in underground water, core-shell Fe-Ag@AgCl nanowires were synthesized and exhibited excellent photocatalytic oxidation effects on co-existing As(III) and Escherichia coli (E. coli). With the introduction of Fe, the nanowires that were used 5 times could be easily magnetically collected, and the As(III) oxidation effect of these re-chlorinated nanowires increased from 39% to 60%. E. coli was completely inactivated within 60 min without photoreactivation after 20 min. Extracellular polymeric substances have play a protective role in the disinfection process. Quenching testing results confirmed that, except for the superoxide radical (•O2-), the subdominant active species were different for different objects: hole (hVB+) to As(III) and hydroxyl radical (•OH) to E. coli. Therefore the system with co-existing As(III) and E. coli, the inactivation effect of Fe-Ag@AgCl on E. coli decreased remarkably with an increase in As(III) concentration, while the oxidation process of As(III) was not significantly affected by E. coli until E. coli was increased to 108 cfu/mL. The photocatalytic process of co-existing As(III) and E. coli is displayed in a schematic diagram and was tested using desired results obtained from field groundwater in Xiantao City, Hubei Province. The function of Fe in band structures and density of states was analyzed using plane-wave density functional theory. These magnetic nanowires presented excellent photocatalytic ability on co-existing As(III) and E. coli, and provided new insights into drinking water safety in high-arsenic areas.
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Affiliation(s)
- Yanping Cui
- School of Environmental Studies, Hubei Key Laboratory of Yangtze River Basin Environmental Aquatic Science, China University of Geosciences (Wuhan), Wuhan, 430078, PR China.
| | - Qian Ye
- School of Environmental Studies, Hubei Key Laboratory of Yangtze River Basin Environmental Aquatic Science, China University of Geosciences (Wuhan), Wuhan, 430078, PR China
| | - Haili Wang
- School of Environmental Studies, Hubei Key Laboratory of Yangtze River Basin Environmental Aquatic Science, China University of Geosciences (Wuhan), Wuhan, 430078, PR China
| | - Xuewen Duo
- School of Environmental Studies, Hubei Key Laboratory of Yangtze River Basin Environmental Aquatic Science, China University of Geosciences (Wuhan), Wuhan, 430078, PR China
| | - Liang Peng
- School of Environmental Studies, Hubei Key Laboratory of Yangtze River Basin Environmental Aquatic Science, China University of Geosciences (Wuhan), Wuhan, 430078, PR China
| | - Wei Dong
- School of Environmental Studies, Hubei Key Laboratory of Yangtze River Basin Environmental Aquatic Science, China University of Geosciences (Wuhan), Wuhan, 430078, PR China
| | - Xiaoxiao Cui
- School of Environmental Studies, Hubei Key Laboratory of Yangtze River Basin Environmental Aquatic Science, China University of Geosciences (Wuhan), Wuhan, 430078, PR China
| | - Yue Lu
- School of Environmental Studies, Hubei Key Laboratory of Yangtze River Basin Environmental Aquatic Science, China University of Geosciences (Wuhan), Wuhan, 430078, PR China
| | - Yajie Li
- School of Environmental Science and Engineering, Jiangsu Provincial Key Laboratory of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, Jiangsu Province, China
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14
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Pestana CJ, Hui J, Camacho-Muñoz D, Edwards C, Robertson PKJ, Irvine JTS, Lawton LA. Solar-driven semi-conductor photocatalytic water treatment (TiO 2, g-C 3N 4, and TiO 2+g-C 3N 4) of cyanotoxins: Proof-of-concept study with microcystin-LR. Chemosphere 2023; 310:136828. [PMID: 36241123 DOI: 10.1016/j.chemosphere.2022.136828] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 10/05/2022] [Accepted: 10/07/2022] [Indexed: 06/16/2023]
Abstract
Cyanobacteria and their toxins are a threat to drinking water safety as increasingly cyanobacterial blooms (mass occurrences) occur in lakes and reservoirs all over the world. Photocatalytic removal of cyanotoxins by solar light active catalysts is a promising way to purify water at relatively low cost compared to modifying existing infrastructure. We have established a facile and low-cost method to obtain TiO2 and g-C3N4 coated floating photocatalysts using recycled glass beads. g-C3N4 coated and TiO2+g-C3N4 co-coated beads were able to completely remove microcystin-LR in artificial fresh water under both natural and simulated solar light irradiation without agitation in less than 2 h. TiO2 coated beads achieved complete removal within 8 h of irradiation. TiO2+g-C3N4 beads were more effective than g-C3N4 beads as demonstrated by the increase reaction rate with reaction constants, 0.0485 min-1 compared to 0.0264 min-1 respectively, with TiO2 alone found to be considerably slower 0.0072 min-1. g-C3N4 based photocatalysts showed a similar degradation pathway to TiO2 based photocatalysts by attacking the C6-C7 double bond on the Adda side chain.
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Affiliation(s)
- Carlos J Pestana
- School of Pharmacy and Life Sciences, Robert Gordon University, Garthdee Road, Aberdeen, Scotland, AB10 7GJ, UK.
| | - Jianing Hui
- School of Chemistry, University of St Andrews, North Haugh, St Andrews, Scotland, KY16 9ST, UK
| | - Dolores Camacho-Muñoz
- School of Pharmacy and Life Sciences, Robert Gordon University, Garthdee Road, Aberdeen, Scotland, AB10 7GJ, UK
| | - Christine Edwards
- School of Pharmacy and Life Sciences, Robert Gordon University, Garthdee Road, Aberdeen, Scotland, AB10 7GJ, UK
| | - Peter K J Robertson
- School of Chemistry and Chemical Engineering, The Queen's University of Belfast, Stanmillis Road, Belfast, Northern Ireland, BT9 5AG, UK
| | - John T S Irvine
- School of Chemistry, University of St Andrews, North Haugh, St Andrews, Scotland, KY16 9ST, UK
| | - Linda A Lawton
- School of Pharmacy and Life Sciences, Robert Gordon University, Garthdee Road, Aberdeen, Scotland, AB10 7GJ, UK
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15
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Shan J, Wu X, Li C, Hu J, Zhang Z, Liu H, Xia P, Huang X. Photocatalytic degradation of tetracycline hydrochloride by a Fe 3O 4/g-C 3N 4/rGO magnetic nanocomposite mechanism: modeling and optimization. Environ Sci Pollut Res Int 2023; 30:8098-8109. [PMID: 36050555 DOI: 10.1007/s11356-022-22770-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Accepted: 08/24/2022] [Indexed: 06/15/2023]
Abstract
The photocatalytic degradation of antibiotics requires a good separation efficiency of photogenerated electron-hole pairs and a wide visible light absorption range. Current studies have discussed the successful preparation of ferroferric oxide/graphite carbon nitride/reduced graphene oxide (Fe3O4/g-C3N4/rGO). The phase structure and morphology of the Fe3O4/g-C3N4/rGO composites were characterized by XRD, HR-TEM, SEM, and EDS. The obtained composites were used to degrade tetracycline hydrochloride (TCH) to evaluate its photocatalytic activity. The effects of four variables on the degradation of TCH were analyzed by the response surface method and artificial intelligence (gradient regression tree, random forest, artificial neural network, etc.). The results showed that the graphite carbon nitride in the catalyst maintained its original structure and that the photocatalytic activity was significantly improved. The degradation rate of TCH was 86.7% under the optimal conditions (the Fe3O4/g-C3N4/rGO dosage was 0.1 g, pH = 7.0, the initial concentration of TCH was 20 mg/L, and the visible light irradiation time was 60 min). At the same time, the degradation rate of TCH changed little after the material was used five times, which indicates that the stability and recyclability of the Fe3O4/g-C3N4/rGO photocatalyst were excellent. Finally, a possible photocatalytic mechanism of the Fe3O4/g-C3N4/rGO photocatalyst is proposed in this paper.
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Affiliation(s)
- Junyue Shan
- Guizhou Provincial Key Laboratory for Information Systems of Mountainous Areas and Protection of Ecological Environment, Guizhou Normal University, 550001, Guiyang, China
| | - Xianliang Wu
- Guizhou Institute of Biology, Guiyang, Guizhou, 550009, China
| | - Caifang Li
- Guizhou Provincial Key Laboratory for Information Systems of Mountainous Areas and Protection of Ecological Environment, Guizhou Normal University, 550001, Guiyang, China
| | - Jiwei Hu
- Guizhou Provincial Key Laboratory for Information Systems of Mountainous Areas and Protection of Ecological Environment, Guizhou Normal University, 550001, Guiyang, China
- , Guiyang City, China
| | - Zhenming Zhang
- Guizhou Institute of Biology, Guiyang, Guizhou, 550009, China
| | - Huijuan Liu
- The Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang, 550025, China
| | - Pinhua Xia
- Guizhou Provincial Key Laboratory for Information Systems of Mountainous Areas and Protection of Ecological Environment, Guizhou Normal University, 550001, Guiyang, China
| | - Xianfei Huang
- Guizhou Provincial Key Laboratory for Information Systems of Mountainous Areas and Protection of Ecological Environment, Guizhou Normal University, 550001, Guiyang, China.
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16
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Ji Z, Yang X, Qi X, Zhang H, Zhang Y, Xia X, Pei Y. Facile synthesis of waste-based CdS-loaded hierarchically porous geopolymer for adsorption-photocatalysis of organic contamination and its environmental risks. Chemosphere 2022; 308:136144. [PMID: 36029860 DOI: 10.1016/j.chemosphere.2022.136144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Revised: 07/14/2022] [Accepted: 08/17/2022] [Indexed: 06/15/2023]
Abstract
In order to obtain an adsorbent-photocatalyst with low-cost, strong stability and great reusability/recyclability, a waste-based and CdS-loaded hierarchically porous geopolymer (HPG) was prepared by facile synthesis. The adsorption-photocatalysis ability, reusability, and stability of HPG under different conditions were determined. Results indicated that HPG showed better adsorption-photocatalysis performance for organic dyes under alkaline environment, and it remained a high adsorption-photocatalysis efficiency after used for five times. Furthermore, HPG was stable in different environment conditions (strong acidic, acid raining, neutral, high salinity, and high alkali environment). The mass loss of HPG were around 3.22-6.68% (7 days extraction), and the immobilization rates of Cd2+ in neutral, high salinity, and high alkali environments were higher than 99.99%. Under visible light irradiation, HPG effectively photo-degraded the organic substances in overlying water of polluted sediments. After 330 min irradiation, the concentrations of COD and TOC were decreased from 47.52 mg/L and 20.9 mg/L to 16.58 mg/L and 11.19 mg/L, respectively. The humic-like and fulvic-like substances were transformed to protein-like substances under photo-degradation effect. This study confirmed that HPG possesses advantages in cost, chemical stability, and reusability, and it has a great potential to be used as in-situ remediation environmental functional material for organic contaminants in lake.
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Affiliation(s)
- Zehua Ji
- State Key Laboratory of Water Environment Simulation, Ministry of Education, School of Environment, Beijing Normal University, Beijing, 100875, China; Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Xiaohuan Yang
- State Key Laboratory of Water Environment Simulation, Ministry of Education, School of Environment, Beijing Normal University, Beijing, 100875, China; The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing, 100875, China
| | - Xinyu Qi
- State Key Laboratory of Water Environment Simulation, Ministry of Education, School of Environment, Beijing Normal University, Beijing, 100875, China; The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing, 100875, China
| | - Hao Zhang
- State Key Laboratory of Water Environment Simulation, Ministry of Education, School of Environment, Beijing Normal University, Beijing, 100875, China; The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing, 100875, China
| | - Yu Zhang
- State Key Laboratory of Water Environment Simulation, Ministry of Education, School of Environment, Beijing Normal University, Beijing, 100875, China; The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing, 100875, China
| | - Xinghui Xia
- State Key Laboratory of Water Environment Simulation, Ministry of Education, School of Environment, Beijing Normal University, Beijing, 100875, China; The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing, 100875, China
| | - Yuansheng Pei
- State Key Laboratory of Water Environment Simulation, Ministry of Education, School of Environment, Beijing Normal University, Beijing, 100875, China; The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing, 100875, China.
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17
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Chen M, Li M, Li P, Lee SLJ, Tang J, Li Q, Lin S. Enhanced visible light-driven photodegradation of tetracycline by salicylic acid-modified graphitic carbon nitride and toxicity assessment. Environ Sci Pollut Res Int 2022; 29:90768-90778. [PMID: 35876997 DOI: 10.1007/s11356-022-22000-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 07/10/2022] [Indexed: 06/15/2023]
Abstract
The tetracycline (TC) in water has led to serious concern. Graphitic carbon nitride (g-C3N4) photocatalysts were produced via copolymerization of mono-benzene ring-mediated precursors (urea, melamine, and dicyandiamide) involving salicylic acid (SA) for TC degradation. The SA-modified g-C3N4 samples showed improved visible light absorbance, transfer and separation of photogenerated electrons, and prospective photocatalytic application in TC degradation. As a result, the optimal SA-modified g-C3N4 (2 wt% of SA) using urea (CNU-SA-2) showed 2 times higher TC degradation than that of pristine g-C3N4. The process of TC degradation was evaluated by the reduction of antibacterial activity and extensively studied by varying the types of TC, initial pH values, co-existing anions, and natural organic materials. In addition, the catalyst could be reused for at least four cycles, indicating good reusability. The main active species were revealed to be h+ and ·O2- by scavenging experiments and electron spin resonance. The CNU-SA-2 photocatalyst and TC intermediates during degradation had no adverse impact on zebrafish embryos. This work could provide a design strategy and a perspective on the practical application of g-C3N4-based photocatalysts for the treatment of wastewater containing antibiotics.
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Affiliation(s)
- Mengmeng Chen
- College of Environmental Science and Engineering, Biomedical Multidisciplinary Innovation Research Institute, Shanghai East Hospital, Tongji University, 1239 Siping Road, Shanghai, 200092, China
- Key Laboratory of Yangtze River Water Environment, Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai, 200092, China
- College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai, 200090, China
| | - Mengxue Li
- College of Environmental Science and Engineering, Biomedical Multidisciplinary Innovation Research Institute, Shanghai East Hospital, Tongji University, 1239 Siping Road, Shanghai, 200092, China.
- Key Laboratory of Yangtze River Water Environment, Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai, 200092, China.
| | - Peng Li
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Stephanie Ling Jie Lee
- College of Environmental Science and Engineering, Biomedical Multidisciplinary Innovation Research Institute, Shanghai East Hospital, Tongji University, 1239 Siping Road, Shanghai, 200092, China
- Key Laboratory of Yangtze River Water Environment, Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai, 200092, China
| | - Juanjuan Tang
- College of Environmental Science and Engineering, Biomedical Multidisciplinary Innovation Research Institute, Shanghai East Hospital, Tongji University, 1239 Siping Road, Shanghai, 200092, China
- Key Laboratory of Yangtze River Water Environment, Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai, 200092, China
| | - Qian Li
- College of Environmental Science and Engineering, Biomedical Multidisciplinary Innovation Research Institute, Shanghai East Hospital, Tongji University, 1239 Siping Road, Shanghai, 200092, China
- Key Laboratory of Yangtze River Water Environment, Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai, 200092, China
| | - Sijie Lin
- College of Environmental Science and Engineering, Biomedical Multidisciplinary Innovation Research Institute, Shanghai East Hospital, Tongji University, 1239 Siping Road, Shanghai, 200092, China.
- Key Laboratory of Yangtze River Water Environment, Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai, 200092, China.
- College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai, 200090, China.
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18
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Pan B, Zhou L, Qin J, Wang C, Ma X, Sharma VK. Oxidation of micropollutants by visible light active graphitic carbon nitride and ferrate(VI): Delineating the role of surface delocalized electrons. Chemosphere 2022; 307:135886. [PMID: 35926741 DOI: 10.1016/j.chemosphere.2022.135886] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Revised: 07/12/2022] [Accepted: 07/27/2022] [Indexed: 06/15/2023]
Abstract
The treatment of recalcitrant micropollutants in water remains challenging. Ferrate(VI) (FeVIO42-, Fe(VI)) has emerged as a green oxidant to oxidize organic molecules, however, its reactivity with recalcitrant micropollutants are sluggish. Our results demonstrate enhanced oxidation of carbamazepine (CBZ) by three types of visible light-responsive graphitic carbon nitride (g-C3N4) photocatalyst in absence and presence of ferrate(VI) (FeVIO42-, Fe(VI)) under mild alkaline conditions. The g-C3N4 photocatalysts were prepared by thermal process using urea, thiourea, and melamine and were named as CN-U, CN-T, and CN-M, respectively. The degradation efficiency of CBZ, in both visible light-g-C3N4 and visible light-g-C3N4-FeVIO42- systems followed the order of CN-U > CN-T > CN-M. The mechanisms for this trend was elucidated by measuring physiochemical properties of the microstructures with various surface and analytical techniques. Results suggest the dominating role of specific surface area and surface delocalized electrons of microstructures in degrading CBZ. Crystallinity, morphology, and surface functional groups may not directly associate with CBZ degradation. The CN-U has higher specific surface area and surface delocalized electrons than CN-T and CN-M and therefore the highest degradation efficiency of CBZ. The surface electrons likely generated O2●- and 1O2 in the visible light-g-C3N4 system. The additional oxidants, FeV and FeIV in the visible light-g-C3N4- FeVIO42- system led to higher degradation efficiency than the visible light-g-C3N4 system. Results suggest that the surfaces of g-C3N4 may be prepared preferentially with high levels of delocalized electrons at the surface of microstructures to enhance degradation of micropollutants.
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Affiliation(s)
- Bao Pan
- Key Laboratory of Chemical Additives for China National Light Industry, School of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, PR China; Program for the Environment and Sustainability, Department of Environment and Occupational Health, School of Public Health, Texas A&M University, 212 Adriance Lab Rd., College Station, TX, 77843, USA
| | - Linxing Zhou
- Key Laboratory of Chemical Additives for China National Light Industry, School of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, PR China
| | - Jiani Qin
- School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, PR China
| | - Chuanyi Wang
- School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, PR China
| | - Xingmao Ma
- Department of Civil and Environmental Engineering, Texas A&M University, College Station, TX, 77843, USA
| | - Virender K Sharma
- Program for the Environment and Sustainability, Department of Environment and Occupational Health, School of Public Health, Texas A&M University, 212 Adriance Lab Rd., College Station, TX, 77843, USA.
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Yuan F, Li C, Yang R, Tan Y, Ma R, Zhang X, Zheng S, Sun Z. High-efficient mineralization of formaldehyde by three-dimensional "PIZZA"-like bismuth molybdate-titania/diatomite composite. J Colloid Interface Sci 2022; 624:713-724. [PMID: 35696789 DOI: 10.1016/j.jcis.2022.06.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 06/03/2022] [Accepted: 06/03/2022] [Indexed: 12/17/2022]
Abstract
The application of TiO2-based photocatalysts in air pollution control has attracted much attention thanks to their advantageous green and sustainable performance. However, how to improve the degradation efficiency under visible light is still challenging. Herein, we report a ternary three-dimensional "PIZZA"-like Bi2MoO6-TiO2/diatomite (BTD) composite with high-efficient mineralization and recycling performance towards gaseous formaldehyde (HCHO) under visible light. The high-efficient adsorption-photocatalysis collaborative system with intimate interface combination is successfully established among Bi2MoO6 (BMO), TiO2 and diatomite. The HCHO mineralization rate constant of BTD-1:2 composite is up to around 4.03 times and 2.18 times higher than those of bare BMO and binary Bi2MoO6-TiO2 composite, respectively. It is indicated that the introduction of diatomite increases active sites and plays the vital role in the improvement of photocatalysis. In addition, the photogenerated holes (h+) and hydroxyl radical (OH) are proved to be the main active species for HCHO mineralization. Furthermore, there is a competitive adsorption relationship between water (H2O) molecules and HCHO molecules, and both H2O molecules and oxygen (O2) molecules participated in the reaction of HCHO mineralization based on in-situ DRIFTs spectra analysis. Our work would give a new perspective on gaseous HCHO purification.
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Affiliation(s)
- Fang Yuan
- School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; Faculty of Science, National University of Singapore, Singapore 117543, Singapore
| | - Chunquan Li
- School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
| | - Renfeng Yang
- School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
| | - Ye Tan
- School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; Faculty of Science, National University of Singapore, Singapore 117543, Singapore
| | - Ruixin Ma
- Hebei Key Laboratory of Hazardous Chemicals Safety and Control Technology, School of Chemical and Environmental Engineering, North China Institute of Science and Technology, Langfang 065201, China
| | - Xiangwei Zhang
- School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
| | - Shuilin Zheng
- School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
| | - Zhiming Sun
- School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China.
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20
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Wu Y, Zhao X, Li Y, Ling Y, Zhang Y, Zhang X, Huang S. New insights into the efficient charge transfer by construction of adjustable dominant facet of BiOI/CdS heterojunction for antibiotics degradation and chromium Cr(VI) reduction under visible-light irradiation. Chemosphere 2022; 302:134862. [PMID: 35533931 DOI: 10.1016/j.chemosphere.2022.134862] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 04/12/2022] [Accepted: 05/03/2022] [Indexed: 06/14/2023]
Abstract
The narrow light-response range and high electron/hole recombination rate greatly restrict the widespread use of photocatalytic technology. The integration of exposing dominant facet of semiconductor and Z-scheme heterostructures designing is expected to break those barriers. Herein,In this work, hydrothermal and ultrasonic stirring methods were used to selectively exposed the (001) and (110) facet of BiOI to construct the BiOI/CdS heterostructures. The obtained BiOI(001)/CdS material shown the maximum degradation for tetracycline-based antibiotics (Oxytetracycline, Tetracycline and Doxycycline), and excellent reduction of hexavalent chromium. Combining the electron spin resonance and scavenger experiments, the superior photocatalytic capacity was attributed to the generation of superoxide and hydroxyl radicals. DFT calculation results shown BiOI(001)/CdS performed high binding energy and adsorption energy for hexavalent chromium, and the different work function between BiOI(001) and CdS confirmed the building of internal electric field, thereby increased the charge separation. Finally, the Gaussian 09 and HPLC-MS program investigated the attack sites of free radicals and degradation pathways in the degradation of antibiotics. This study not only provides a potential photocatalyst, also gives an in-depth understanding of the photocatalytic properties of heterojunctions constructed by different exposed crystal facets.
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Affiliation(s)
- Yixiao Wu
- School of Geography & Environmental Science, Guizhou Normal University, Guiyang, 550000, China; School of Environment and Energy, South China University of Technology, Higher Education Mega Center, Guangzhou, 510006, China
| | - Xuesong Zhao
- Institute of Environment and Ecology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, Guangdong, China
| | - Yihao Li
- School of Environment and Energy, South China University of Technology, Higher Education Mega Center, Guangzhou, 510006, China
| | - Yu Ling
- School of Environment and Energy, South China University of Technology, Higher Education Mega Center, Guangzhou, 510006, China
| | - Yongqing Zhang
- School of Environment and Energy, South China University of Technology, Higher Education Mega Center, Guangzhou, 510006, China
| | - Xiaoqian Zhang
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, China.
| | - Shaobin Huang
- School of Environment and Energy, South China University of Technology, Higher Education Mega Center, Guangzhou, 510006, China.
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21
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Cao S, Zhang Y, Ding K, Xu J, Zhao Y, Wang Y, Xie X, Wang H. Efficient visible light driven degradation of antibiotic pollutants by oxygen-doped graphitic carbon nitride via the homogeneous supramolecular assembly of urea. Environ Res 2022; 210:112920. [PMID: 35167850 DOI: 10.1016/j.envres.2022.112920] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 02/01/2022] [Accepted: 02/06/2022] [Indexed: 06/14/2023]
Abstract
Graphitic carbon nitride (CN), as a non-metal material, has emerged as a promising photocatalyst to address environmental issues with the favorable band gap and chemical stability. The porous oxygen-doped CN nanosheets (CNO) were synthesized by an ecofriendly and efficient self-assembled approach using a sole urea as the precursor. The CNO photocatalysts were derived from the hydrogen-bonded cyanuric acid-urea supramolecular complex, which were obtained by pretreatment of urea at high temperature and pressure. The homogeneous supramolecular assembly was advantageous to the formation of uniform porous and oxygen-doped CN nanosheets. The formation process of the supramolecular intermediate and the CNO nanosheets were investigated. Moreover, doping amount of O in CNO could be controlled by the time of the high-pressure thermal polymerization of urea. The characterization results shown that the O atoms were successfully doped into the framework of CN by substitution the N atoms to form the C-O structures. The obtained CNO photocatalysts demonstrated the excellent visible-light photocatalytic performances for sulfamerazine (SMR) degradation, which was ascribed to synergistic interaction of porous structure and O doping. The degradation intermediates of SMR were identified and the degradation pathway were also proposed. Furthermore, density functional theory (DFT) calculations proved that O doping changed the electronic structure of CN, resulting in more easier to activate O2. This work provides a novel perceptive for the development of high-performance nonmetal photocatalysts by using the homogeneous supramolecular assembly, which exhibits great potential in the environmental treatment.
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Affiliation(s)
- Shihai Cao
- College of Environmental Engineering, Nanjing Institute of Technology, Nanjing, 211167, China
| | - Yu Zhang
- Key Laboratory of Jiangsu Province for Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Keqiang Ding
- College of Environmental Engineering, Nanjing Institute of Technology, Nanjing, 211167, China
| | - Jianhua Xu
- Joint Laboratory of Advanced Biomedical Materials (NFU-UGent), College of Chemical Engineering, Nanjing Forestry University, 210037, China
| | - Yuqi Zhao
- College of Environmental Engineering, Nanjing Institute of Technology, Nanjing, 211167, China
| | - Yi Wang
- College of Environmental Engineering, Nanjing Institute of Technology, Nanjing, 211167, China
| | - Xianchuan Xie
- Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, School of Resources Environmental & Chemical Engineering, Nanchang University, Nanchang, 330031, China; Jiangxi Nanxin Environmental Protection Technology Co. LTD, Jiujiang City of Jiangxi Province, 330300, China.
| | - Huiya Wang
- College of Environmental Engineering, Nanjing Institute of Technology, Nanjing, 211167, China.
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Sun S, Tang Q, Zhou L, Gao Y, Zhang W, Liu W, Jiang C, Wan J, Zhou L, Xie M. Exploring the photocatalytic inactivation mechanism of Microcystis aeruginosa under visible light using Ag 3PO 4/g-C 3N 4. Environ Sci Pollut Res Int 2022; 29:29993-30003. [PMID: 34997489 DOI: 10.1007/s11356-021-17857-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Accepted: 11/26/2021] [Indexed: 06/14/2023]
Abstract
In this work, a series of Ag3PO4/g-C3N4 (AG) photocatalysts were synthesized. After characterizing the properties, the effects of mass ratio, light intensity, and material dosages on photodegradation were investigated. The material with a 1/2 mass ratio of Ag3PO4/g-C3N4 showed the highest photocatalytic activity under visible light, and the removal efficiency reached 90.22% for an initial suspended algae concentration of 2.7 × 106 cells/mL, 0.1 g of AG, and 3 h of irradiation. These results showed that the conductivity was increased while the total protein and COD contents of the algae suspension were declined rapidly. In contrast, the variations in the malondialdehyde (MDA) level suggested that the algae cell wall was severely damaged and that selective permeability of the membrane was significantly affected. A possible photocatalytic mechanism was proposed and •O2- was shown to be the major reactive oxygen species in the photocatalysis. In summary, during the visible light photocatalytic process, the cell structure was destroyed, which caused the leakage of electrolyte, the inactivation of protein, and the inhibition of photosynthesis; finally, the cells died. This study provides a reference for photodegradation of algae pollution in water bodies.
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Affiliation(s)
- Shiquan Sun
- School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha, 410114, China.
- Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha, 410114, China.
| | - Qingxin Tang
- School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha, 410114, China
| | - Lean Zhou
- School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha, 410114, China
- Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha, 410114, China
| | - Yang Gao
- School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha, 410114, China
- Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha, 410114, China
| | - Wei Zhang
- School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha, 410114, China
- Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha, 410114, China
| | - Wang Liu
- School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha, 410114, China
| | - Changbo Jiang
- School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha, 410114, China
- Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha, 410114, China
| | - Junli Wan
- School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha, 410114, China
- Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha, 410114, China
| | - Lu Zhou
- School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha, 410114, China
- Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha, 410114, China
| | - Min Xie
- School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha, 410114, China
- Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha, 410114, China
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23
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Bagherzadeh SB, Kazemeini M, Mahmoodi NM. Preparation of novel and highly active magnetic ternary structures (metal-organic framework/cobalt ferrite/graphene oxide) for effective visible-light-driven photocatalytic and photo-Fenton-like degradation of organic contaminants. J Colloid Interface Sci 2021; 602:73-94. [PMID: 34118607 DOI: 10.1016/j.jcis.2021.05.181] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 05/23/2021] [Accepted: 05/31/2021] [Indexed: 12/16/2022]
Abstract
Herein, MIL-101(Fe), CoFe2O4, novel binary (MIL-101(Fe)/CoFe2O4, MIL-101(Fe)/GO and CoFe2O4/GO), and ternary (MIL-101(Fe)/CoFe2O4/(3%)GO and MIL-101(Fe)/CoFe2O4/(7%)GO) magnetic composites based upon the MIL-101(Fe) were synthesized. The XRD, FESEM, TEM, EDX, BET-BJH, FTIR, VSM, DRS, PL, EIS and other electrochemical analyses were applied to characterize samples. The MIL/CoFe2O4/(3%)GO demonstrated the best performance compared to other samples for visible light photocatalytic and photo-Fenton-like degradation of Direct Red 23 (DtR-23), Reactive Red 198 (ReR-198) dyes as well as Tetracycline Hydrochloride (TC-H) antibiotic. Degradation of dyes using the ternary composite after 70 min of visible light irradiation was greater than that of 99%. The presence of the optimum GO as a strong electron acceptor in MIL/CoFe2O4/(3%)GO not only led to the effective separation of charge carriers and thus reduction of their recombination but also increased the absorption of visible light. The composite possessed good durability in terms of stability and reusability. The PL, EIS and electrochemical analyses indicated that the MIL/CoFe2O4/(3%)GO improved the optical properties and photocatalytic performance.
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Affiliation(s)
- Seyed Behnam Bagherzadeh
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran; Department of Environmental Research, Institute for Color Science and Technology, Tehran, Iran
| | - Mohammad Kazemeini
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
| | - Niyaz Mohammad Mahmoodi
- Department of Environmental Research, Institute for Color Science and Technology, Tehran, Iran.
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24
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Wang Y, Zhou J, Ma X, Li X, Lang X. Cooperative Photocatalysis with 4-Amino-TEMPO for Selective Aerobic Oxidation of Amines over TiO 2 Nanotubes. Chem Asian J 2021; 16:2659-2668. [PMID: 34302305 DOI: 10.1002/asia.202100682] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 07/20/2021] [Indexed: 12/17/2022]
Abstract
Attaching π-conjugated molecules onto TiO2 can form surface complexes that could capture visible light. However, to make these TiO2 surface complexes durable, integrating 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) or its analogues as a redox mediator with photocatalysis is the key to constructing selective chemical transformations. Herein, sodium 6,7-dihydroxynaphthalene-2-sulfonate (DHNS) was obtained by extending the π-conjugated system of catechol by adding a benzene ring and a substituent sodium sulfonate (-SO3 - Na+ ). The DHNS-TiO2 showed the best photocatalytic activity towards the blue light-induced selective aerobic oxidation of benzylamine. Compared to TEMPO, 4-amino-2,2,6,6-tetramethylpiperidine-1-oxyl (4-amino-TEMPO) could rise above 70% in conversion of benzylamine over the DHNS-TiO2 photocatalyst. Eventually, a wide range of amines could be selectively oxidized into imines with atmospheric O2 by cooperative photocatalysis of DHNS-TiO2 with 4-amino-TEMPO. Notably, superoxide (O2 •- ) is crucial in coupling the photocatalytic cycle of DHNS-TiO2 and the redox cycle of 4-amino-TEMPO. This work underscores the design of surface ligands for semiconductors and the selection of a redox mediator in visible light photocatalysis for selective chemical transformations.
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Affiliation(s)
- Yuexin Wang
- Sauvage Center for Molecular Sciences, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Jun Zhou
- Sauvage Center for Molecular Sciences, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Xiaoming Ma
- Sauvage Center for Molecular Sciences, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Xia Li
- Sauvage Center for Molecular Sciences, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Xianjun Lang
- Sauvage Center for Molecular Sciences, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
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25
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Zhu Z, Zhu C, Hu C, Liu B. Facile fabrication of BiOIO 3/MIL-88B heterostructured photocatalysts for removal of pollutants under visible light irradiation. J Colloid Interface Sci 2021; 607:595-606. [PMID: 34509734 DOI: 10.1016/j.jcis.2021.08.183] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Revised: 08/26/2021] [Accepted: 08/27/2021] [Indexed: 02/04/2023]
Abstract
In this work, a Z-scheme heterojunction of BiOIO3/MIL-88B was constructed via two steps solvothermal method. Various characterization techniques showed that this Z-scheme heterojunction is an effective strategy to promote spatial charge separation, and the catalytic performance was evaluated by degrading simulated organic pollutants. Herein, the BiOIO3/MIL-88B composites exhibited an exceptional removal rate for Reactive Blue 19 and tetracycline hydrochloride (TC) under visible light irradiation, which was approximately 3.28 and 4.22 times higher than the pristine BiOIO3, respectively. Additionally, the analysis of photocatalysis mechanism showed that the active species O2- and OH could strongly affect the degradation of tetracycline hydrochloride (TC) in the studied system. Furthermore, the degradation process of TC was tracked and detected by identifying intermediates produced in the reaction system. It is anticipated that this research can deepen the understanding of BiOIO3/MIL-88B heterojunction structure to remove organic contaminants and provide a strategy for applying photocatalytic technology in the practical industry.
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Affiliation(s)
- Zhijia Zhu
- Key Lab of Science and Technology of Eco-textile, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Innovation Center for Textile Science and Technology, Donghua University, Shanghai, 201620, China
| | - Chenmiao Zhu
- Key Lab of Science and Technology of Eco-textile, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Innovation Center for Textile Science and Technology, Donghua University, Shanghai, 201620, China
| | - Chunyan Hu
- Key Lab of Science and Technology of Eco-textile, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Innovation Center for Textile Science and Technology, Donghua University, Shanghai, 201620, China
| | - Baojiang Liu
- Key Lab of Science and Technology of Eco-textile, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Innovation Center for Textile Science and Technology, Donghua University, Shanghai, 201620, China.
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26
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Yang W, Yang Z, Shao L, Li S, Liu Y, Xia X. Photocatalytic reduction of Cr(VI) over cinder-based nanoneedle in presence of tartaric acid: Synergistic performance and mechanism. J Environ Sci (China) 2021; 107:194-204. [PMID: 34412782 DOI: 10.1016/j.jes.2021.02.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 02/02/2021] [Accepted: 02/03/2021] [Indexed: 06/13/2023]
Abstract
Cr(VI) is a common heavy metal ion, which will seriously harm human body and environment. Therefore, the removal of Cr(VI) has become an attractive topic. In this work, cinder was used as a raw material to synthesize a nanoneedle material: γ-(AlOOH@FeOOH) (γ-Al@Fe). The physicochemical properties of γ-Al@Fe were thoroughly characterized, and its effectiveness as a catalyst for photocatalytic reduction of Cr(VI) was evaluated. The results showed that Cr(VI) could be efficiently reduced by γ-Al@Fe in the presence of tartaric acid (TA) under visible light. The variable factors on the reaction were investigated in detail, and the results showed that under optimal conditions (γ-Al@Fe 0.4 g/L, TA 0.6 g/L, pH 2), Cr(VI) was completely reduced within 7 min. Besides, scavenger experiments and EPR proved that O2• - and CO2• - played a significant role in the photocatalytic reduction of Cr(VI). TA acts as a sacrificial agent to trap the holes and generate strong reducing free radicals: CO2• -. Dissolving O2 could react with electrons to generate O2• -. This work discussed the performance and mechanism of photocatalytic reduction of Cr(VI) in detail, which provided a new idea for the resource utilization of solid waste and the treatment of heavy metal sewage.
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Affiliation(s)
- Wenwu Yang
- College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Zhenfei Yang
- College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Luhua Shao
- College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Sijian Li
- College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Yutang Liu
- College of Environmental Science and Engineering, Hunan University, Lushan South Road, Yuelu District, Changsha 410082, China
| | - Xinnian Xia
- College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China; Advanced Catalytic Engineering Research Center of the Ministry of Education, Hunan University, Changsha 410082, China.
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27
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Wu Y, Zhao X, Huang S, Li Y, Zhang X, Zeng G, Niu L, Ling Y, Zhang Y. Facile construction of 2D g-C 3N 4 supported nanoflower-like NaBiO 3 with direct Z-scheme heterojunctions and insight into its photocatalytic degradation of tetracycline. J Hazard Mater 2021; 414:125547. [PMID: 33676258 DOI: 10.1016/j.jhazmat.2021.125547] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2020] [Revised: 02/10/2021] [Accepted: 02/25/2021] [Indexed: 06/12/2023]
Abstract
Photocatalytic oxidation using solar energy is a promising green technology to degrade antibiotic contaminants. Herein, a 2D g-C3N4 supported nanoflower-like NaBiO3 with direct Z-scheme heterojunction was synthesized via a facile hydrothermal approach, and the photocatalytic performance of g-C3N4/NaBiO3 was remarkable better than that of g-C3N4 and NaBiO3 for tetracycline degradation under visible light. Photoinduced electrons accumulated on the conduction band of g-C3N4 and holes gathered on the valence band of NaBiO3, which was more suitable for generating superoxide and hydroxyl radicals. Meanwhile, the built-in electric field between g-C3N4 and NaBiO3 was proved by their different work functions based on DFT calculations, which enhanced the charges separation. The formed radicals were determined by ESR, and their role in the degradation of tetracycline was examined by the active species trapping test. Moreover, the sites attacked by free radicals and degradation pathways for tetracycline were inferred by the results of Gaussian 09 program and HPLC-MS. The effects of water matrix and three other organic contaminants was further studied for actual use evaluation. Importantly, the prepared g-C3N4/NaBiO3 showed stable photodegradation activity for eight cycles. This work not only provides a promising photocatalyst, but also gets insight into the photocatalytic removal of tetracycline.
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Affiliation(s)
- Yixiao Wu
- School of Environment and Energy, South China University of Technology, Higher Education Mega Center, Guangzhou 510006, China; Qiannan Normal University for Nationalities, Duyun 558000, China
| | - Xuesong Zhao
- Institute of Environment and Ecology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, Guangdong, China
| | - Shaobin Huang
- School of Environment and Energy, South China University of Technology, Higher Education Mega Center, Guangzhou 510006, China.
| | - Yihao Li
- School of Environment and Energy, South China University of Technology, Higher Education Mega Center, Guangzhou 510006, China
| | - Xiaoqian Zhang
- School of Environment and Energy, South China University of Technology, Higher Education Mega Center, Guangzhou 510006, China
| | - Gongchang Zeng
- School of Environment and Energy, South China University of Technology, Higher Education Mega Center, Guangzhou 510006, China
| | - Lishan Niu
- School of Environment and Energy, South China University of Technology, Higher Education Mega Center, Guangzhou 510006, China
| | - Yu Ling
- School of Environment and Energy, South China University of Technology, Higher Education Mega Center, Guangzhou 510006, China
| | - Yongqing Zhang
- School of Environment and Energy, South China University of Technology, Higher Education Mega Center, Guangzhou 510006, China
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28
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Mohammad A, Khan ME, Cho MH, Yoon T. Graphitic‑carbon nitride based mixed-phase bismuth nanostructures: Tuned optical and structural properties with boosted photocatalytic performance for wastewater decontamination under visible-light irradiation. NanoImpact 2021; 23:100345. [PMID: 35559846 DOI: 10.1016/j.impact.2021.100345] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2021] [Revised: 07/20/2021] [Accepted: 08/02/2021] [Indexed: 06/15/2023]
Abstract
To enhance the activities of advanced semiconductor photocatalysts, the charge carriers must be separated effectively. One strategy for achieving this is the use of heterogeneous structures, which can be prepared by hydrothermal synthesis and post-synthetic thermal and ultrasonic treatment. Herein, we report a mixed-phase composite of basic bismuth nitrate/pentabismuth heptaoxide nitrate (PC) prepared by hydrothermal synthesis under basic conditions and post-synthetic thermal treatment. In addition, sulfur-doped-graphitic carbon nitride (S-g-C3N4) was prepared and combined with PC in different ratios, denoted as PC-1, PC-2, and PC-3, using sonication-assisted treatment. The characterization of these catalysts confirmed the formation of mixed basic bismuth nitrate/pentabismuth heptaoxide nitrate phases and the composite nanostructure. The developed nanostructure showed interesting morphological features, for example, layered sheets of S-g-C3N4. The prepared PCs were tested for their visible light responsiveness for the photocatalytic degradation of a representative organic dye (Rhodamine B). We found that the modified photocatalysts showed superior activity to that of pristine PC. The optimal photocatalyst (PC-3) was also used to degrade methylene blue and Congo red, achieving 99% degradation. Thus, we present not only an efficient photocatalyst but also insights into the post-synthetic modification of basic bismuth nitrate/pentabismuth heptaoxide nitrate with stable carbon-based nanostructures.
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Affiliation(s)
- Akbar Mohammad
- School of Chemical Engineering, Yeungnam University, Gyeongsan-si, Gyeongbuk 38541, South Korea.
| | - Mohammad Ehtisham Khan
- Department of Chemical Engineering Technology, College of Applied Industrial Technology (CAIT), Jazan University, Jazan 45971, Kingdom of Saudi Arabia
| | - Moo Hwan Cho
- School of Chemical Engineering, Yeungnam University, Gyeongsan-si, Gyeongbuk 38541, South Korea
| | - Taeho Yoon
- School of Chemical Engineering, Yeungnam University, Gyeongsan-si, Gyeongbuk 38541, South Korea.
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Liu W, Li Z, Kang Q, Wen L. Efficient photocatalytic degradation of doxycycline by coupling α-Bi 2O 3/g-C 3N 4 composite and H 2O 2 under visible light. Environ Res 2021; 197:110925. [PMID: 33737075 DOI: 10.1016/j.envres.2021.110925] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 02/02/2021] [Accepted: 02/19/2021] [Indexed: 05/26/2023]
Abstract
Antibiotic pollutants have posed a huge threat to the ecological environment and human health. In this work, α-Bi2O3/g-C3N4 composite was prepared and coupled with H2O2 for the rapid and efficient degradation of doxycycline (DOX) in water under visible light irradiation. The composite exhibited enhanced photocatalytic activity and 80.5% of DOX could be degraded in 120 min. The addition of H2O2 significantly improved the degradation efficiency of DOX under visible light, resulting in 79.0% of it degraded within 30 min, and the degradation rate constant of DOX was 3.6 times than that without H2O2. On the one hand, the Z-scheme heterojunction of α-Bi2O3/g-C3N4 promoted the separation rate of photogenerated electron-hole pairs, thereby enhancing the photocatalytic activity of the composite. On the other hand, the improvement of photocatalytic efficiency also benefited from the extra hydroxyl radicals generated by the reaction of photogenerated electrons with H2O2 in the photocatalytic system. Free radicals trapping experiments and electron spin resonance tests proved that played prominent role in the degradation process. After adding H2O2, OH also became important active species. Cyclic degradation experiments demonstrated the recyclability of the composite photocatalyst in DOX elimination applications. This work provides an efficient, clean, and recyclable purification strategy for removing antibiotic contaminants from water.
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Affiliation(s)
- Wei Liu
- Faculty of Resources and Environmental Science, Hubei University, Wuhan, 430062, China; Hubei Rural Safe Drinking Water Engineering Technology Research Center, Wuhan, 430062, China
| | - Zhaohua Li
- Faculty of Resources and Environmental Science, Hubei University, Wuhan, 430062, China; Hubei Rural Safe Drinking Water Engineering Technology Research Center, Wuhan, 430062, China
| | - Qun Kang
- Faculty of Resources and Environmental Science, Hubei University, Wuhan, 430062, China.
| | - Lilian Wen
- Faculty of Resources and Environmental Science, Hubei University, Wuhan, 430062, China
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30
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Scimone A, Redfern J, Patiphatpanya P, Thongtem T, Ratova M, Kelly P, Verran J. Development of a rapid method for assessing the efficacy of antibacterial photocatalytic coatings. Talanta 2021; 225:122009. [PMID: 33592748 DOI: 10.1016/j.talanta.2020.122009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 12/08/2020] [Accepted: 12/12/2020] [Indexed: 11/28/2022]
Abstract
Visible-light activated photocatalytic coatings may represent an attractive antimicrobial solution in domains such as food, beverage, pharmaceutical, biomedical and wastewater remediation. However, testing methods to determine the antibacterial effects of photocatalytic coatings are limited and require specialist expertise. This paper describes the development of a method that enables rapid screening of coatings for photocatalytic-antibacterial activity. Relying on the ability of viable microorganisms to reduce the dye resazurin from a blue to a pink colour, the method relates the time taken to detect this colour change with number of viable microorganisms. The antibacterial activity of two photocatalytic materials (bismuth oxide and titanium dioxide) were screened against two pathogenic organisms (Escherichia coli and Klebsiella pneumoniae) that represent potential target microorganisms using traditional testing and enumeration techniques (BS ISO 27447:2009) and the novel rapid method. Bismuth oxide showed excellent antibacterial activity under ambient visible light against E. coli, but was less effective against K. pneumoniae. The rapid method showed excellent agreement with existing tests in terms of number of viable cells recovered. Due to advantages such as low cost, high throughput, and less reliance on microbiological expertise, this method is recommended for researchers seeking an inexpensive first-stage screen for putative photocatalytic-antibacterial coatings.
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Affiliation(s)
- Antony Scimone
- Department of Life Sciences, Faculty of Science and Engineering, Manchester Metropolitan University, Manchester, UK.
| | - James Redfern
- Department of Natural Sciences, Faculty of Science and Engineering, Manchester Metropolitan University, Manchester, UK
| | - Panudda Patiphatpanya
- Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
| | - Titipun Thongtem
- Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand; Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
| | - Marina Ratova
- Surface Engineering Group, Faculty of Science and Engineering, Manchester Metropolitan University, Manchester, UK
| | - Peter Kelly
- Surface Engineering Group, Faculty of Science and Engineering, Manchester Metropolitan University, Manchester, UK
| | - Joanna Verran
- Department of Life Sciences, Faculty of Science and Engineering, Manchester Metropolitan University, Manchester, UK.
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31
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Ghanbari M, Salavati-Niasari M. Copper iodide decorated graphitic carbon nitride sheets with enhanced visible-light response for photocatalytic organic pollutant removal and antibacterial activities. Ecotoxicol Environ Saf 2021; 208:111712. [PMID: 33396043 DOI: 10.1016/j.ecoenv.2020.111712] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2020] [Revised: 11/18/2020] [Accepted: 11/20/2020] [Indexed: 06/12/2023]
Abstract
The photocatalytic process is an environmentally-friendly procedure that has been well known in the destruction of organic pollutants in water. The multiple semiconductor heterojunctions are broadly applied to enhance the photocatalytic performances in comparison to the single semiconductor. Polymeric semiconductors have received much attention as inspiring candidates owing to their adjustable optical absorption features and simply adaptable electronic structure. The shortcomings of the current photocatalytic system, which restricts their technical applications incorporate fast charge recombination, low-utilization of visible radiation, and low immigration capability of the photo-induced electron-hole. This paper indicates the novel fabrication of new CuI/g-C3N4 nanocomposite by hydrothermal and ultrasound-assisted co-precipitation methods. The structure, shape, and purity of the products were affected by different weight percentages and fabrication processes. Electron microscope unveils that CuI nanoparticles are distributed on g-C3N4. The bandgap of pure carbon nitride is estimated at 2.70 eV, and the bandgap of the nanocomposite has increased to 2.8 eV via expanding the amount of CuI. The CuI/C3N4 nanocomposite has a great potential to degrade cationic and anionic dyes in high value because of its appropriate bandgap. It can be a great catalyst for water purification. The photocatalytic efficiency is affected by multiple factors such as types of dyes, fabrication methods, the light sources, mass ratios, and scavengers. The fabricated CuI/C3N4 nanocomposite exposes higher photocatalytic performance than the pure C3N4 and CuI. The photocatalytic efficiency of nanocomposite is enhanced by enhancing the amount of CuI. Besides, the fabricated CuI/C3N4 revealed remarkable reusability without the obvious loss of photocatalytic activity. The antibacterial activity of the specimens reveals that the highest antimicrobial activities are revealed against P. aeruginosa and E. coli. These results prove that the nanocomposite possesses high potential for killing bacteria, and it can be nominated as a suitable agent against bacteria.
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Affiliation(s)
- Mojgan Ghanbari
- Institute of Nano Science and Nano Technology, University of Kashan, Kashan P.O. Box 87317-51167, Iran
| | - Masoud Salavati-Niasari
- Institute of Nano Science and Nano Technology, University of Kashan, Kashan P.O. Box 87317-51167, Iran.
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Benabbas K, Zabat N, Hocini I. Facile synthesis of Fe 3O 4/CuO a core-shell heterostructure for the enhancement of photocatalytic activity under visible light irradiation. Environ Sci Pollut Res Int 2021; 28:4329-4341. [PMID: 32944857 DOI: 10.1007/s11356-020-10749-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Accepted: 09/06/2020] [Indexed: 06/11/2023]
Abstract
A magnetically separable Fe3O4/CuO core-shell heterostructure photocatalyst was synthesized by hydrothermal method. The obtained photocatalyst was characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscope (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and UV-visible diffuse reflectance (UV-DRS). The obtained photocatalyst was used for the degradation of azo dye Direct Red 89 (DR89), under visible light irradiation provided by fluorescent lamp of 100 W in the presence of 7 mL of H2O2 (30%); the results of the photocatalytic activity for Fe3O4/CuO photocatalyst showed that in the presence of 0.75 g dispersed in 250 mL of 40 mg/L of DR89 dye at pH 6 the dye was completely removed after 240 min. Moreover, the photocatalytic activity of the prepared Fe3O4/CuO was enhanced 11 and 9 times compared with the pure Fe3O4 or CuO. The effect of initial dye concentrations on the photocatalytic activity was studied in the range of 20-60 mg/L, and the results showed that the catalyst has a good photocatalytic activity of 89% even at high concentration (60 mg/L). Furthermore, the catalyst maintained its activity after 5 cycles, and its paramagnetic property facilitates its recovery. The excellent photodegradation activity of Fe3O4/CuO was attributed to the low band gap of the catalyst equal to 1.54 eV and the enhancement of light absorption in visible range of 330-780 nm, but also to a better charge carriers separation, due to the presence of Fe3O4 that reduces electron/hole recombination.
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Affiliation(s)
- Khaled Benabbas
- Laboratory of Organic Synthesis-Modeling and Optimization of Chemical Processes, Badji Mokhtar University, P.O. Box 12, 23000, Annaba, Algeria.
| | - Nassira Zabat
- Laboratory of Organic Synthesis-Modeling and Optimization of Chemical Processes, Badji Mokhtar University, P.O. Box 12, 23000, Annaba, Algeria
| | - Imene Hocini
- Laboratory of Organic Synthesis-Modeling and Optimization of Chemical Processes, Badji Mokhtar University, P.O. Box 12, 23000, Annaba, Algeria
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Orooji Y, Ghanbari M, Amiri O, Salavati-Niasari M. Facile fabrication of silver iodide/graphitic carbon nitride nanocomposites by notable photo-catalytic performance through sunlight and antimicrobial activity. J Hazard Mater 2020; 389:122079. [PMID: 32062394 DOI: 10.1016/j.jhazmat.2020.122079] [Citation(s) in RCA: 77] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 01/08/2020] [Accepted: 01/11/2020] [Indexed: 05/24/2023]
Abstract
Silver iodide/graphitic carbon nitride nanocomposites have been successfully fabricated through sonication-assisted deposition-precipitation route at room temperature and hydrothermal method. Varied mass ratios and preparation processes can modify the structure, purity, shape, and scale of specimens. The purity of the product was confirmed by Energy Dispersive X-Ray Spectroscopy (EDS) and X-ray crystallography. The morphology and size of specimens could be observed with transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM). The bandgap was evaluated around 2.82 eV for pure g-C3N4. The bandgap has reduced to 2.70 eV by increasing the quantity of silver iodide in the nanocomposites. The photocatalytic activity of AgI/C3N4 has been studied over the destruction of rhodamine B (RhB) and methyl orange (MO) through visible radiation due to their suitable bandgap. The as-prepared AgI/C3N4 nanocomposites photocatalyst revealed better photocatalytic behavior than the genuine AgI and C3N4 which ascribed to synergic impacts at the interconnection of C3N4 and AgI. Furthermore, these nanocomposites have great potential for being a great antibacterial agent.
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Affiliation(s)
- Yasin Orooji
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, PR China; College of Materials Science and Engineering, Nanjing Forestry University, 159 Longpan Road, Nanjing, 210037, PR China.
| | - Mojgan Ghanbari
- Institute of Nano Science and Nano Technology, University of Kashan, Kashan, Islamic Republic of Iran
| | - Omid Amiri
- Department of Chemistry, College of Science, University of Raparin, Rania, Kurdistan Region, Iraq
| | - Masoud Salavati-Niasari
- Institute of Nano Science and Nano Technology, University of Kashan, Kashan, Islamic Republic of Iran.
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Wu M, He X, Jing B, Wang T, Wang C, Qin Y, Ao Z, Wang S, An T. Novel carbon and defects co-modified g-C 3N 4 for highly efficient photocatalytic degradation of bisphenol A under visible light. J Hazard Mater 2020; 384:121323. [PMID: 31586913 DOI: 10.1016/j.jhazmat.2019.121323] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 09/14/2019] [Accepted: 09/25/2019] [Indexed: 06/10/2023]
Abstract
Graphite carbon nitride (g-C3N4, CN) is considered as a promising semiconductor for environmental catalysis. However, pure CN can not meet the requirements for actual applications due to its high recombination rate of photogenerated electron-hole pairs and a relatively large band gap preventing full utilization of solar energy. In this work, we report synthesis of a novel carbon and defects co-modified g-C3N4 (CxCN) by calcination of melamine activated by oxalic. This new catalyst CxCN has porous structure with much higher surface areas compared with pristine CN. UV-vis analysis and DFT calculations show that CxCN has a lower bandgap for enhancing visible light adsorption compared with CN. Photoluminescence (PL) and photoelectrochemical analyses show that CxCN has a low recombination rate of photogenerated electron-hole pairs, which improves the utilization of solar energy. As a result, CxCN samples show high efficiency for the degradation of bisphenol A (BPA) under visible light irradiation, where the best catalyst of CxCN (C1.0CN) samples shows about 22 times higher photocatalytic degradation rate than that of CN. Moreover, C1.0CN shows high mineralization rate and can degrade BPA into CO2 and H2O by the generated active species, like superoxide radicals (O2-) and holes (h+).
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Affiliation(s)
- Ming Wu
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 51006, China
| | - Xin He
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 51006, China
| | - Binghua Jing
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 51006, China
| | - Teng Wang
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 51006, China
| | - Chengyin Wang
- College of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Environmental Engineering and Monitoring, Yangzhou University, 180 Si-Wang Ting Road, Yangzhou, 225002, China
| | - Yanlin Qin
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 51006, China
| | - Zhimin Ao
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 51006, China.
| | - Shaobin Wang
- School of Chemical Engineering, University of Adelaide, Adelaide, SA 5005, Australia
| | - Taicheng An
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 51006, China
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35
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Zhang Z, Yu J, Ma L, Sun Y, Wang P, Wang T, Peng S. Preparation of the plasmonic Ag/AgBr/ZnO film substrate for reusable SERS detection: Implication to the Z-scheme photocatalytic mechanism. Spectrochim Acta A Mol Biomol Spectrosc 2020; 224:117381. [PMID: 31412311 DOI: 10.1016/j.saa.2019.117381] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 06/25/2019] [Accepted: 07/12/2019] [Indexed: 06/10/2023]
Abstract
In this work, a novel Ag/AgBr/ZnO SERS substrate was prepared by calcinating spin-coated zinc acetate on glass slides in the presence of ethanolamine (EA), followed by the process of impregnating-precipitation-photoreduction treatment. The SERS performances of Ag/AgBr/ZnO substrates were evaluated using aqueous crystal violet (CV) and Rhodamine 6G (R6G) as target analytes. The effects of initial immersion precursor concentration and irradiation time on the SERS performance were systematically studied. The as-prepared SERS substrate exhibited good chemical detection sensitivity, reproducibility and reusability. The optimal Ag/AgBr/ZnO (10 mM-30 min) substrates were capable of detecting 10-12 M CV and 10-11 M R6G aqueous solutions. The quantitative detection by the SERS substrate was investigated by constructing a linear corresponding calibration plot. The Ag/AgBr/ZnO SERS substrate was regenerated by a simple visible light driven photocatalytic process. A plausible Z-scheme visible light photocatalytic mechanism seems to account for the Ag-ZnO-AgBr system. This SERS substrate can be separated from the reaction easily, and the results indicated that the film was reusable for eight times without significantly losing the SERS efficiency, each time accompanied by a simple photo-driven regeneration. This study reveals that the Ag/AgBr/ZnO film on glass is practically applicable as an ultra-highly sensitive SERS substrate that can be readily regenerated.
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Affiliation(s)
- Zhengyi Zhang
- State Key Laboratory of Advanced Technology for Float Glass, Bengbu 233000, PR China
| | - Jiajie Yu
- Research Center of Microelectronics and Information Materials, Hangzhou Innovation Institute of Beihang University, Hangzhou 310051, PR China
| | - Liyun Ma
- State Key Laboratory of Advanced Technology for Float Glass, Bengbu 233000, PR China
| | - Yangshan Sun
- State Key Laboratory of Advanced Technology for Float Glass, Bengbu 233000, PR China
| | - Pingping Wang
- State Key Laboratory of Advanced Technology for Float Glass, Bengbu 233000, PR China
| | - Tianhe Wang
- State Key Laboratory of Advanced Technology for Float Glass, Bengbu 233000, PR China.
| | - Shou Peng
- State Key Laboratory of Advanced Technology for Float Glass, Bengbu 233000, PR China.
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Wang L, Bian Z. Photocatalytic degradation of paracetamol on Pd-BiVO 4 under visible light irradiation. Chemosphere 2020; 239:124815. [PMID: 31526994 DOI: 10.1016/j.chemosphere.2019.124815] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 09/02/2019] [Accepted: 09/07/2019] [Indexed: 05/09/2023]
Abstract
In this study, Pd-BiVO4 bearing highly dispersed Pd nanoparticles was prepared from pure BiVO4 using an impregnation method. The pure BiVO4 and Pd-BiVO4 catalysts were characterized by X-ray diffraction, scanning electron microscopy, UV-visible diffuse reflection, transmission electron microscopy, and X-ray photoelectron spectroscopy. The results showed that the prepared catalysts had a monoclinic scheelite structure and exhibited a flake-like morphology. Pd-BiVO4 showed a distinct response in the visible light region, with an extended absorption edge at 550 nm. According to the Scherrer formula, the nanocrystal particle sizes of the BiVO4 and Pd-BiVO4 catalysts were 35 and 28 nm, respectively. Highly dispersed Pd nanoparticles with sizes of 2.5 ± 0.5 nm were observed on the BiVO4 surface. Two Pd valence states, Pd(II) and Pd(0), were identified in a 2:1 ratio. Pd-BiVO4 exhibited excellent activity for paracetamol (PCT) degradation, with 100% removal achieved in 1 h under visible light irradiation. During degradation, the mineralization ratio reached up to 40% total organic carbon removal. Two highly active species, namely, hydroxyl and superoxide radicals, were determined by electron spin resonance (ESR). Furthermore, the potential degradation of PCT in this system was proposed based on intermediate information obtained using HPLC-MS and Gauss analysis. The high dispersion and small size of Pd nanoparticles might favor the removal of emerging contaminants using the Pd-BiVO4 photocatalytic system.
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Affiliation(s)
- Linyuan Wang
- College of Water Sciences, Beijing Normal University, Beijing, 100875, PR China
| | - Zhaoyong Bian
- College of Water Sciences, Beijing Normal University, Beijing, 100875, PR China.
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Hu Z, Cai X, Wang Z, Li S, Wang Z, Xie X. Construction of carbon-doped supramolecule-based g-C 3N 4/TiO 2 composites for removal of diclofenac and carbamazepine: A comparative study of operating parameters, mechanisms, degradation pathways. J Hazard Mater 2019; 380:120812. [PMID: 31326838 DOI: 10.1016/j.jhazmat.2019.120812] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 06/11/2019] [Accepted: 06/21/2019] [Indexed: 06/10/2023]
Abstract
An eco-friendly 2D heterojunction photocatalyst composites (BCCNT) consisting of carbon-doped supramolecule-based g-C3N4 (BCCN) layers and TiO2 nanoparticles has been fabricated via an in-situ method. Based on the SEM and XPS results affirmed that the coaction of doped carbon and supramolecule precursors lead to the different morphology of pure g-C3N4, C-doped g-C3N4 have improved the photodegradation diclofenac (DCF) and carbamazepine (CBZ). And the degradation efficiencies of DCF and CBZ could reach 98.92% and 99.77%, which were separately corresponded to 30 min (min) and 6 h (h) of LED lamp illumination. Additionally, the effects of catalysis dosage, solution pH, natural organic matter (NOM), inorganic anions (Cl-, SO42-, NO3-) and different water matrices were deeply investigated. The scavenger experiments demonstrated that •O2-, h+ were main active species under visible irradiation. Furthermore, the photodegradation pathways of DCF and CBZ were detected by high-resolution mass spectrometry (HRMS) instruments and three-dimensional excitation-emission matrix fluorescence spectra (3D EEMs). Eventually, the possible photocatalytic mechanisms of BCCNT were proposed.
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Affiliation(s)
- Zhongzheng Hu
- Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Xuewei Cai
- Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Zirun Wang
- Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Shan Li
- Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Zhaowei Wang
- Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Xiaoyun Xie
- Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China.
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38
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Su R, Ge S, Li H, Su Y, Li Q, Zhou W, Gao B, Yue Q. Synchronous synthesis of Cu 2O/Cu/rGO@carbon nanomaterials photocatalysts via the sodium alginate hydrogel template method for visible light photocatalytic degradation. Sci Total Environ 2019; 693:133657. [PMID: 31635004 DOI: 10.1016/j.scitotenv.2019.133657] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 07/27/2019] [Accepted: 07/27/2019] [Indexed: 06/10/2023]
Abstract
A series of Cu2O/Cu/rGO@carbon nanomaterial (Cu2O/Cu/rGO@CN) heterogeneous photocatalysts were successfully synthesized synchronously via a novel sodium alginate hydrogel method. Cu2O nanoparticles (~50nm) were synthesized by calcination under the protection of a nitrogen atmosphere. Cu nanoparticles (~6nm) inevitably appeared on the surface of Cu2O, thereby forming a Cu2O/Cu heterostructure which is known as a Schottky junction. Graphene oxide (GO) nanosheets were synchronously reduced in situ by sodium alginate during the synthesis process and eventually acted as a 3-D structure with the assistance of the hydrogel skeleton. Because of the 3-D rGO modification, both the adsorption capacity and the photocatalytic activity of Cu2O/Cu/rGO@CN were significantly improved. The rate of p-nitrochlorobenzene (p-NCB) degradation catalyzed by Cu2O/Cu/rGO@CN was ~1.97×10-2min-1, which was much higher than that of the degradation catalyzed by Cu2O/Cu@CN (~0.239×10-2min-1). This result could be attributed to the two-stage Cu2O/Cu/rGO heterostructure, which facilitated efficient electron-hole separation. This method has the advantages of nontoxic raw materials, facile synthesis and reduced auxiliary usage, providing a new technique for designing heterogeneous photocatalysts.
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Affiliation(s)
- Ruidian Su
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China
| | - Shuhan Ge
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China
| | - Hua Li
- Shandong Shared Environmental Management Consulting Co., Ltd, Jinan 250100, PR China
| | - Yuan Su
- School of Mathematic and Quantitative Economics, Shandong University of Finance and Economics, 250014 Jinan, PR China
| | - Qian Li
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China.
| | - Weizhi Zhou
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China
| | - Baoyu Gao
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China
| | - Qinyan Yue
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China
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Zhang L, Liu F, Xiao X, Zuo X, Nan J. Microwave synthesis of iodine-doped bismuth oxychloride microspheres for the visible light photocatalytic removal of toxic hydroxyl-contained intermediates of parabens: catalyst synthesis, characterization, and mechanism insight. Environ Sci Pollut Res Int 2019; 26:28871-28883. [PMID: 31385253 DOI: 10.1007/s11356-019-06074-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2019] [Accepted: 07/25/2019] [Indexed: 06/10/2023]
Abstract
The iodine-doped bismuth oxychloride (I-doped BiOCl) microspheres are synthesized as the visible light photocatalysts for the photocatalytic removal of three toxic hydroxyl-contained intermediates of parabens. With the aid of the unique heating mode of microwave method, the I-doped BiOCl photocatalysts with tunable iodine contents and dispersed energy bands, instead of a mixture of BiOI and BiOCl or solid solution, are synthesized under the controllable conditions. Due to the stretched architectures, high specific surface area, and effective separation of photogenerated carriers, they exhibit high activity to the photocatalytic degradation of methyl 2,4-dihydroxybenzoate (MDB), methyl 3,4-dihydroxybenzoate (MDHB), and ethyl 2,4-dihydroxybenzoate (EDB). As a typical result, it is indicated that though MDB as the most difficult intermediate of parabens to be degraded, a 91.2% removal ratio can still be achieved over the I-doped BiOCl with an energy band of 2.79 eV within 60 min. In addition, it is also confirmed that these photocatalysts remain stable throughout the photocatalytic reaction and can be reused, and more importantly, the photogenerated h+ and •O2- are the key reactive species, while •OH plays a negligible role in the photocatalytic reaction. Resorcinol was identified as the main photodegraded intermediate. These results demonstrate that this photocatalytic system not only exhibit a high efficiency but also avoid the consequent secondary pollutions due to the no formation of complex hydroxyl derivatives.
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Affiliation(s)
- Ling Zhang
- School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, People's Republic of China
| | - Fei Liu
- School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, People's Republic of China
| | - Xin Xiao
- School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, People's Republic of China.
| | - Xiaoxi Zuo
- School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, People's Republic of China
| | - Junmin Nan
- School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, People's Republic of China.
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40
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Yi C, Liao Q, Deng W, Huang Y, Mao J, Zhang B, Wu G. The preparation of amorphous TiO 2 doped with cationic S and its application to the degradation of DCFs under visible light irradiation. Sci Total Environ 2019; 684:527-536. [PMID: 31154225 DOI: 10.1016/j.scitotenv.2019.05.338] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 05/22/2019] [Accepted: 05/22/2019] [Indexed: 06/09/2023]
Abstract
An amorphous S-doping TiO2 catalyst [S-TiO2 (300)] with visible light catalytic activity was successfully prepared via a sol-gel method with low-temperature calcination (300 °C) using thiourea as the sulfur source. The S-TiO2 (300) catalyst showed great performance in degrading the recalcitrant pharmaceutical, diclofenac (DCF). 93% of the target pollutant DCF degraded in 4 h under visible light irradiation. Both the amorphous form of the catalyst and cationic S-doping (with a coordinated structure) contributed to narrowing the band gap. As a result, the photocatalytic activity of S-TiO2 (300) was significantly enhanced under visible light irradiation. In addition, oxidative species such as photogenic cavitation (h+), OH and O2- were proved to participate in the photodegradation process, attacking COOH group and NH bond, degraded DCF into low molecule organic gradually.
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Affiliation(s)
- Chuan Yi
- School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; Hubei Academy of Environmental Sciences, Wuhan 430072, China
| | - Qi Liao
- Hubei Academy of Environmental Sciences, Wuhan 430072, China
| | - Wei Deng
- College of Resources and Environmental Science, South-central University For Nationalities, Wuhan 430074, China
| | - Yawei Huang
- Hubei Academy of Environmental Sciences, Wuhan 430072, China
| | - Juan Mao
- School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Beiping Zhang
- School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Guiping Wu
- College of Resources and Environmental Science, South-central University For Nationalities, Wuhan 430074, China.
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41
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Chen CR, Zeng HY, Yi MY, Xiao GF, Zhu RL, Cao XJ, Shen SG, Peng JW. Fabrication of Ag 2O/Ag decorated ZnAl-layered double hydroxide with enhanced visible light photocatalytic activity for tetracycline degradation. Ecotoxicol Environ Saf 2019; 172:423-431. [PMID: 30735974 DOI: 10.1016/j.ecoenv.2019.01.080] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 01/17/2019] [Accepted: 01/19/2019] [Indexed: 06/09/2023]
Abstract
The photocatalytic performance of layered double hydroxides (LDH) is usually confined to the slow interface mobility and high recombination rate of photogenerated electron-hole pairs in material. To overcome the low photocatalytic efficiency, novel Ag2O/Ag decorated LDH (LDH-Ag2O/Ag) was successfully synthesized by depositing Ag2O on the surface of LDH and then converted to Ag° nanoparticles in the right position after heat treatment. The as-synthesized LDH-Ag2O/Ag composites were characterized by Powder X-ray diffraction (XRD), Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflectance spectra (UV-vis DRS), photoluminescence spectra (PL) and transient photocurrent (TPC) analysis. Compared with virgin LDH, the photocatalytic activities of LDH-Ag2O/Ag composites were enhanced significantly. The optimum photocatalytic efficiency of LDH-Ag10 (0.0184 min-1) was nearly 46 times higher than that of virgin LDH (0.0004 min-1). The result of active species trapping experiments indicated that •OH, h+, and •O2- have an effect on the TC degradation, where •OH played the predominant role during the photocatalytic process. The possible photocatalytic mechanisms involving the charge transfer pathway and reactive species generation during the process of TC degradation were also discussed. The improved photocatalytic activity of LDH-Ag2O/Ag could be attributed to the synergetic effect between LDH and Ag2O/Ag that extended visible light range and reduced photogenerated charge carriers recombination.
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Affiliation(s)
- Chao-Rong Chen
- College of Chemical Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China
| | - Hong-Yan Zeng
- College of Chemical Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China.
| | - Mo-Yu Yi
- College of Chemical Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China
| | - Gao-Fei Xiao
- College of Chemical Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China
| | - Run-Liang Zhu
- Key Laboratory of Mineralogy and Metallogeny, Guangdong Provincial Key Laboratory of Mineral Physics and Material Research & Development, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
| | - Xiao-Jv Cao
- College of Chemical Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China
| | - Shi-Gen Shen
- College of Chemical Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China
| | - Jia-Wen Peng
- College of Chemical Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China
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Hong S, Ratpukdi T, Sungthong B, Sivaguru J, Khan E. A sustainable solution for removal of glutaraldehyde in saline water with visible light photocatalysis. Chemosphere 2019; 220:1083-1090. [PMID: 33395795 DOI: 10.1016/j.chemosphere.2018.12.216] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 12/25/2018] [Accepted: 12/31/2018] [Indexed: 06/12/2023]
Abstract
Glutaraldehyde (GA) is the most common biocide used in unconventional oil and gas production. Photocatalytic degradation of GA in brine simulating oil and gas produced water using Ag/AgCl/BiOCl composite as a photocatalyst with visible light was investigated. Removal of GA at 0.1 mM in 200 g/L NaCl solution at pH 7 was 90% after 75 min irradiation using 5 g/L of the photocatalyst. The GA removal followed pseudo-first order reaction with a rate constant of 0.0303 min-1. At pH 5 or at 300 g/L NaCl, the photocatalytic removal of GA was almost completely inhibited. Similar inhibitions were observed when adding dissolved organic carbon (from humic acid) at 10 and 200 mg/L, or Br- at 120 mg/L to the system. The removal rate of GA markedly increased with increasing pH (5-9), photocatalyst loading (2-8 g/L) and under 350 nm UV (compared to visible light). On the contrary, the removal rate of GA markedly decreased with increasing NaCl and initial GA concentrations (0-300 g/L for NaCl and 0.1-0.4 mM for GA). A quenching experiment was also conducted; electron holes (h+) and superoxide () were found as the main reactive species responsible for the removal of GA while OH had a very limited effect.
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Affiliation(s)
- Soklida Hong
- Environmental and Conservation Sciences Program, North Dakota State University, Fargo, ND, 58108, USA; International Postgraduate Programs in Environmental Management, Graduate School Chulalongkorn University, Bangkok, 10330, Thailand.
| | - Thunyalux Ratpukdi
- Department of Environmental Engineering, Faculty of Engineering and Research Center for Environmental and Hazardous Substance Management, Khon Kaen University, Khon Kaen, 40002, Thailand; Center of Excellence on Hazardous Substance Management (HSM), Bangkok, 10330, Thailand.
| | - Bunleu Sungthong
- Pharmaceutical Chemistry and Natural Product Research Unit, Faculty of Pharmacy, Mahasarakham University, Maha Sarakham, 44150, Thailand.
| | - Jayaraman Sivaguru
- Center for Photochemical Sciences and Department of Chemistry, Bowling Green State University, Bowling Green, OH, 43403, USA.
| | - Eakalak Khan
- Department of Civil and Environmental Engineering and Construction, University of Nevada, Las Vegas, NV, 89154, USA.
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43
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Yu L, Wang L, Sun X, Ye D. Enhanced photocatalytic activity of rGO/TiO 2 for the decomposition of formaldehyde under visible light irradiation. J Environ Sci (China) 2018; 73:138-146. [PMID: 30290862 DOI: 10.1016/j.jes.2018.01.022] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 01/17/2018] [Accepted: 01/22/2018] [Indexed: 06/08/2023]
Abstract
Due to the low concentration of indoor air contaminants, photocatalytic technology shows low efficiency for indoor air purification. The application of TiO2 for photocatalytic removal of formaldehyde is limited, because TiO2 can only absorb ultraviolet (UV) light. Immobilization of TiO2 nanoparticles on the surface of graphene can improve the visible light photocatalytic activity and the adsorption capacity. In this study, rGO (reduced graphene oxide)/TiO2 was synthesized through a hydrothermal method using titanium tetrabutoxide and graphene oxide as precursors, and was used for the degradation of low concentration formaldehyde in indoor air under visible light illumination. Characterization of the crystalline structure and morphology of rGO/TiO2 revealed that most GO was reduced to rGO during the hydrothermal treatment, and anatase TiO2 nanoparticles (with particle size of 15-30nm) were dispersed well on the surface of the rGO sheets. rGO/TiO2 exhibited excellent photocatalytic activity for degradation of formaldehyde in indoor air and this can be attributed to the role of rGO, which can act as the electron sink and transporter for separating photo-generated electron-hole pairs through interfacial charge transfer. Furthermore, rGO could adsorb formaldehyde molecules from air to produce a high concentration of formaldehyde on the surface of rGO/TiO2. Under visible light irradiation for 240min, the concentration of formaldehyde could be reduced to 58.5ppbV. rGO/TiO2 showed excellent moisture-resistance behavior, and after five cycles, rGO/TiO2 maintained high photocatalytic activity for the removal of formaldehyde (84.6%). This work suggests that the synthesized rGO/TiO2 is a promising photocatalyst for indoor formaldehyde removal.
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Affiliation(s)
- Lian Yu
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
| | - Long Wang
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Xibo Sun
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Daiqi Ye
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, Guangzhou 510006, China; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, South China University of Technology, Guangzhou 510006, China
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44
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Stucchi M, Elfiad A, Rigamonti M, Khan H, Boffito DC. Water treatment: Mn-TiO 2 synthesized by ultrasound with increased aromatics adsorption. Ultrason Sonochem 2018; 44:272-279. [PMID: 29680612 DOI: 10.1016/j.ultsonch.2018.01.023] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 01/16/2018] [Accepted: 01/26/2018] [Indexed: 05/20/2023]
Abstract
Pharma-products are mostly single or multiple cyclic compounds. They pollute surface water and are persistent in the aquatic ecosystem. When irradiated by UV light, TiO2 catalysts cleave or degrade organic contaminants in water. Removal of organics by photocatalysis results from a synergistic effect of adsorption and photocatalysis. Synthesis of catalysts by ultrasound (US) produces high surface area and porous solids. Here, we synthesized Mn-doped TiO2 with a US-assisted sol-gel method. Compared to the classical synthesis, US increased the BET surface area from 83 m2 g-1 to 90 m2 g-1 in the Mn-TiO2 sample and from 9.0 m2 g-1 to 53 m2 g-1 in the control TiO2. Accordingly, acetaminophen and amoxicillin adsorption increased from 44% to 52%, and from 34% to 94% for the Mn-TiO2 obtained in absence and presence of US, respectively. When in a mixture, the two drugs strongly compete for adsorption on TiO2.
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Affiliation(s)
- M Stucchi
- Polytechnique Montréal, Department of Chemical Engineering, 2900 boul. Édouard-Montpetit, 2500 chemin de Polytechnique, Montréal, Québec H3T 1J4, Canada
| | - A Elfiad
- Polytechnique Montréal, Department of Chemical Engineering, 2900 boul. Édouard-Montpetit, 2500 chemin de Polytechnique, Montréal, Québec H3T 1J4, Canada; Université des Sciences et de la Technologie Houari Boumediene, Department of Applied Organic Chemistry, BP 32 El Alia, 16111 Bab Ezzouar, Alger, Algeria
| | - M Rigamonti
- Polytechnique Montréal, Department of Chemical Engineering, 2900 boul. Édouard-Montpetit, 2500 chemin de Polytechnique, Montréal, Québec H3T 1J4, Canada
| | - H Khan
- Polytechnique Montréal, Department of Chemical Engineering, 2900 boul. Édouard-Montpetit, 2500 chemin de Polytechnique, Montréal, Québec H3T 1J4, Canada
| | - D C Boffito
- Polytechnique Montréal, Department of Chemical Engineering, 2900 boul. Édouard-Montpetit, 2500 chemin de Polytechnique, Montréal, Québec H3T 1J4, Canada.
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45
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Li Y, Sun Y, Ho W, Zhang Y, Huang H, Cai Q, Dong F. Highly enhanced visible-light photocatalytic NO x purification and conversion pathway on self-structurally modified g-C 3N 4 nanosheets. Sci Bull (Beijing) 2018; 63:609-620. [PMID: 36658881 DOI: 10.1016/j.scib.2018.04.009] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2018] [Revised: 04/02/2018] [Accepted: 04/10/2018] [Indexed: 01/21/2023]
Abstract
The unmodified graphitic carbon nitride (g-C3N4) suffers from low photocatalytic activity because of the unfavourable structure. In the present work, we reported a simple self-structural modification strategy to optimize the microstructure of g-C3N4 and obtained graphene-like g-C3N4 nanosheets with porous structure. In contrast to traditional thermal pyrolysis preparation of g-C3N4, the present thermal condensation was improved via pyrolysis of thiourea in an alumina crucible without a cover, followed by secondary heat treatment. The popcorn-like formation and layer-by-layer thermal exfoliation of graphene-like porous g-C3N4 was proposed to explain the formation mechanism. The photocatalytic removal performance of both NO and NO2 with the graphene-like porous g-C3N4 for was significantly enhanced by self-structural modification. Trapping experiments and in-situ diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) measurement were conducted to detect the active species during photocatalysis and the conversion pathway of g-C3N4 photocatalysis for NOx purification was revealed. The photocatalytic activity of graphene-like porous g-C3N4 was highly enhanced due to the improved charge separation and increased oxidation capacity of the O2- radicals and holes. This work could not only provide a novel self-structural modification for design of highly efficient photocatalysts, but also offer new insights into the mechanistic understanding of g-C3N4 photocatalysis.
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Affiliation(s)
- Yuhan Li
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, Engineering Research Center for Waste Oil Recovery Technology and Equipment, Ministry of Education, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China; Department of Science and Environmental Studies, The Center for Education in Environmental Sustainability, The Education University of Hong Kong, Hong Kong, China
| | - Yanjuan Sun
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, Engineering Research Center for Waste Oil Recovery Technology and Equipment, Ministry of Education, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
| | - Wingkei Ho
- Department of Science and Environmental Studies, The Center for Education in Environmental Sustainability, The Education University of Hong Kong, Hong Kong, China
| | - Yuxin Zhang
- College of Materials Science and Engineering, National Key Laboratory of Fundamental Science of Micro/Nano-Devices and System Technology, Chongqing University, Chongqing 400044, China
| | - Hongwei Huang
- School of Materials Science and Technology, National Laboratory of Mineral Materials, China University of Geosciences, Beijing 100083, China
| | - Qiang Cai
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, Engineering Research Center for Waste Oil Recovery Technology and Equipment, Ministry of Education, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
| | - Fan Dong
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, Engineering Research Center for Waste Oil Recovery Technology and Equipment, Ministry of Education, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China.
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46
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Wang H, He W, Dong X, Wang H, Dong F. In situ FT-IR investigation on the reaction mechanism of visible light photocatalytic NO oxidation with defective g-C 3N 4. Sci Bull (Beijing) 2018; 63:117-125. [PMID: 36658923 DOI: 10.1016/j.scib.2017.12.013] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2017] [Revised: 11/10/2017] [Accepted: 12/05/2017] [Indexed: 01/21/2023]
Abstract
The g-C3N4 with different structures was prepared by heat treatment using urea (CN-U) and thiourea (CN-T) as precursors under the same conditions. The microstructure and optical properties of the photocatalyst were analyzed with advanced tools. The results showed that the CN-U has a porous structure, a high specific surface area and a wide band gap in comparison with CN-T. The in situ FT-IR technique was used to monitor the adsorption and reaction process of visible photocatalytic NO oxidation on g-C3N4. The corresponding reaction mechanism was proposed based on the results of reaction intermediate observation and electron paramagnetic resonance (EPR) radical scavenging. It was revealed that (1) the presence of defective sites favored the adsorption of gas molecules and electronically compensated it leading to promoted formation of the final products; (2) the high separation efficiency of photogenerated electron-hole pairs enhanced the production of radicals during the photocatalytic reaction; (3) the hydroxyl radicals (OH) are not selective for the decomposition of pollutants, which are favorable to the complete oxidation of the reaction intermediates. The above three aspects are the main reasons for the CN-U possessing the efficient visible light photocatalytic activity. The present work could provide new insights and methods for understanding the mechanism of photocatalysis.
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Affiliation(s)
- Hong Wang
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
| | - Wenjie He
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
| | - Xing'an Dong
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
| | - Haiqiang Wang
- Department of Environmental Engineering, Key Laboratory of Polluted Environment Remediation and Ecological Health of Ministry of Education, Zhejiang University, Hangzhou 310027, China
| | - Fan Dong
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China.
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47
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Stucchi M, Bianchi CL, Argirusis C, Pifferi V, Neppolian B, Cerrato G, Boffito DC. Ultrasound assisted synthesis of Ag-decorated TiO 2 active in visible light. Ultrason Sonochem 2018; 40:282-288. [PMID: 28946426 DOI: 10.1016/j.ultsonch.2017.07.016] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Revised: 07/08/2017] [Accepted: 07/08/2017] [Indexed: 05/12/2023]
Abstract
Titanium dioxide is the most popular photocatalyst to degrade organic pollutants in air, as well as in water. The principal drawback preventing its commercial application lies in its limited absorption of the visible light (400-700nm), while it is active under UV irradiation (≤387nm). Supporting noble metals in the form of nanoparticles on TiO2 increases its activity in the visible range. However, both the synthesis of noble metal nanoparticles and their deposition on TiO2 are multi-step processes that often require organic solvents. Here, we deposit Ag nanoparticles from AgNO3 on the surface of micrometric TiO2 with H2O as a solvent and under ultrasound irradiation at 30Wcm-2. Ultrasound increases the surface amount of Ag on TiO2 with heterogeneous size distribution of Ag nanoparticles, which are bigger and overlaid (1-20nm vs. 0.5-3nm) compared to the sample obtained in traditional conditions (TEM images). While this change in morphology had no effect on acetone photodegradation under UV light, the 5%, 10%, and 20% Ag-TiO2 degraded 17%, 20% and 24% acetone under visible light, respectively. The 10% by weight Ag-TiO2 sample obtained in absence of ultrasound only degraded 14% acetone in 6h, while the bare TiO2 was not active.
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Affiliation(s)
- M Stucchi
- Polytechnique Montréal, Département de Génie Chimique, 2900 Edouard Montpetit Blvd, H3C 3A4 Montrèal (QC), Canada; Università di Milano, Chemistry Department, Via Golgi 19, 20133 Milano, Italy.
| | - C L Bianchi
- Università di Milano, Chemistry Department, Via Golgi 19, 20133 Milano, Italy
| | - C Argirusis
- National Technical University of Athens, School of Chemical Engineering, Athens, Greece
| | - V Pifferi
- Università di Milano, Chemistry Department, Via Golgi 19, 20133 Milano, Italy
| | - B Neppolian
- SRM University, SRM Research Institute, Chennai, India
| | - G Cerrato
- Università di Torino & NIS Inter-departmental Centre, Torino, Italy
| | - D C Boffito
- Polytechnique Montréal, Département de Génie Chimique, 2900 Edouard Montpetit Blvd, H3C 3A4 Montrèal (QC), Canada
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Al-Saadi MJ, Al-Harthi SH, Kyaw HH, Myint MT, Bora T, Laxman K, Al-Hinai A, Dutta J. Influence of Atomic Hydrogen, Band Bending, and Defects in the Top Few Nanometers of Hydrothermally Prepared Zinc Oxide Nanorods. Nanoscale Res Lett 2017; 12:22. [PMID: 28063141 PMCID: PMC5218952 DOI: 10.1186/s11671-016-1800-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2016] [Accepted: 11/28/2016] [Indexed: 05/22/2023]
Abstract
We report on the surface, sub-surface (top few nanometers) and bulk properties of hydrothermally grown zinc oxide (ZnO) nanorods (NRs) prior to and after hydrogen treatment. Upon treating with atomic hydrogen (H*), upward and downward band bending is observed depending on the availability of molecular H2O within the structure of the NRs. In the absence of H2O, the H* treatment demonstrated a cleaning effect of the nanorods, leading to a 0.51 eV upward band bending. In addition, enhancement in the intensity of room temperature photoluminescence (PL) signals due to the creation of new surface defects could be observed. The defects enhanced the visible light activity of the ZnO NRs which were subsequently used to photocatalytically degrade aqueous phenol under simulated sunlight. On the contrary, in the presence of H2O, H* treatment created an electronic accumulation layer inducing downward band bending of 0.45 eV (~1/7th of the bulk ZnO band gap) along with the weakening of the defect signals as observed from room temperature photoluminescence spectra. The results suggest a plausible way of tailoring the band bending and defects of the ZnO NRs through control of H2O/H* species.
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Affiliation(s)
- Mubarak J. Al-Saadi
- Department of Physics, Sultan Qaboos University, PO Box 36, Al Khoudh, 123, Muscat, Oman
| | - Salim H. Al-Harthi
- Department of Physics, Sultan Qaboos University, PO Box 36, Al Khoudh, 123, Muscat, Oman
| | - Htet H. Kyaw
- Department of Physics, Sultan Qaboos University, PO Box 36, Al Khoudh, 123, Muscat, Oman
| | - Myo T.Z. Myint
- Department of Physics, Sultan Qaboos University, PO Box 36, Al Khoudh, 123, Muscat, Oman
| | - Tanujjal Bora
- Chair in Nanotechnology, Water Research Center, Sultan Qaboos University, PO Box 17 Al Khoudh, 123, Muscat, Oman
| | - Karthik Laxman
- Chair in Nanotechnology, Water Research Center, Sultan Qaboos University, PO Box 17 Al Khoudh, 123, Muscat, Oman
| | - Ashraf Al-Hinai
- Department of Chemistry, Sultan Qaboos University, PO Box 36, Al Khoudh, 123, Muscat, Oman
| | - Joydeep Dutta
- Functional Materials Division, Materials and Nanophysics, ICT School, KTH Royal Institute of Technology, Isafjordsgatan 22, SE-164 40 Kista, Stockholm Sweden
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49
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Zhang J, Yuan X, Jiang L, Wu Z, Chen X, Wang H, Wang H, Zeng G. Highly efficient photocatalysis toward tetracycline of nitrogen doped carbon quantum dots sensitized bismuth tungstate based on interfacial charge transfer. J Colloid Interface Sci 2017; 511:296-306. [PMID: 29031149 DOI: 10.1016/j.jcis.2017.09.083] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 08/22/2017] [Accepted: 09/21/2017] [Indexed: 12/11/2022]
Abstract
In this study, a novel N-CQDs/Bi2WO6 was synthesized through a facile hydrothermal method. Multiple techniques were applied to investigate the structures, morphologies, optical and electronic properties and photocatalytic performance of as-prepared samples. The results indicated that the hybrid materials were formed with N-CQDs attached on the surface of sphere-like Bi2WO6. The photocatalytic activity of N-CQDs/Bi2WO6 materials was evaluated sufficiently by using tetracycline (TC) as target organic pollutant. N-CQDs/Bi2WO6-5 displayed superior photocatalytic efficiency with nearly 97% removal of TC in 25min and 86.37% mineralization in 90min. The degradation reaction coefficient (kobs) was approximately two times higher than pure Bi2WO6 as a result of the synergistic effects of N-CQDs and Bi2WO6. Increased light harvesting capacity, excellent electron transfer ability and improved molecular oxygen activation ability were obtained in N-CQDs/Bi2WO6 hybrid materials caused by N-CQDs. The present study demonstrated that N-CQDs modification was an effective way to improve photocatalytic efficiency, which can be extended to a general strategy for other semiconductors. The study indicated that novel N-CQDs/Bi2WO6 has a great potential for rapid and efficient treatment of organic pollutants in water.
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Affiliation(s)
- Jin Zhang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China
| | - Xingzhong Yuan
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China.
| | - Longbo Jiang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China
| | - Zhibin Wu
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China
| | - Xiaohong Chen
- Mobile E-business 2011 Collaborative Innovation Center of Hunan Province, Hunan University of Commerce, Changsha 410205, PR China
| | - Hou Wang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China
| | - Hui Wang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China
| | - Guangming Zeng
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China
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Zhang W, Zhou L, Shi J, Deng H. Fabrication of novel visible-light-driven AgI/g-C(3)N(4) composites with enhanced visible-light photocatalytic activity for diclofenac degradation. J Colloid Interface Sci 2017; 496:167-76. [PMID: 28222304 DOI: 10.1016/j.jcis.2017.02.022] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Revised: 02/04/2017] [Accepted: 02/10/2017] [Indexed: 11/20/2022]
Abstract
A visible-light-driven heterostructured AgI/g-C3N4 was prepared by a deposition-precipitation method. The composition, structure, morphology, and optical properties of the photocatalyst were characterized by Brunauer-Emmett-Teller method (BET), X-ray powder diffraction (XRD), Fourier transform-infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), scanning electron microscope (SEM), UV-vis diffused reflectance spectroscopy (DRS), photoluminescence spectroscopy (PL), photocurrent, and electrochemical impedance spectroscopy (EIS), respectively. AgI/g-C3N4 composite photocatalysts exhibited higher photocatalytic activities than those of AgI nanoparticles and g-C3N4 in the degradation of diclofenac (a model anti-inflammatory medicine) under visible light irradiation (λ≥400nm). When the mass molar ratio of AgI was 45% in AgI/g-C3N4, the reaction rate constant of diclofenac degradation reached 0.561min-1, which was almost 12.5 and 43.2 times higher than that achieved by AgI (0.045min-1) and g-C3N4 (0.013min-1). The h+ and O2- were pinpointed as the main reactive species in the photocatalytic reaction using their obligate radical scavengers. Diclofenac was completely degraded and partly mineralized during the photodegradation. The main intermediates were determined by liquid chromatograph mass spectrometer (LC-MS), and toxicological assessments were carried out to evaluate the change of toxicity in the degradation process. In addition, the photocatalysts showed excellent stability over multiple reaction cycles. Finally, a possible photocatalytic and charge separation mechanism was proposed.
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