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Fan J, Gong H, Wang F, Wang L, Yu Y, Liu D, Yang W. Multiplexed electrochemical nucleic acid sensor based on visible light-mediated metal-free thiol-yne click reaction for simultaneous detection of different nucleic acid targets. Talanta 2024; 273:125856. [PMID: 38442565 DOI: 10.1016/j.talanta.2024.125856] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 12/26/2023] [Accepted: 02/28/2024] [Indexed: 03/07/2024]
Abstract
Simultaneous detection of multiple tumor biomarkers with a simple and low-cost assay is crucial for early cancer detection and diagnosis. Herein, we presented a low-cost and simple assay for multiplexed detection of tumor biomarkers using a spatially separated electrodes strategy. The sensor is fabricated based on a metal-free thiol-yne click reaction, which is mediated by visible light, on commercially available indium tin oxide (ITO) electrodes. Four biomarkers, including p53 DNA, Brca2 DNA, K-ras DNA, and MicroRNA-204 RNA, were used as model analytes, and the corresponding oligonucleotide probes were modified on the desired electrode units sequentially with 530 nm irradiation light in the presence of photosensitizer Eosin Y. By this visible light-mediated coupling reaction, oligonucleotide probe densities of up to 9.2 ± 0.7 × 1010 molecules/cm2 were readily obtained on the ITO electrode surface. The proposed multiplexed E-NA sensor could detect four different nucleic acid targets concurrently without crosstalk among adjacent electrodes and was also successfully applied for detecting targets in a 20% fetal calf serum sample. The detection limits for p53 DNA, Brca2 DNA, K-ras DNA, and MicroRNA-204 RNA were 0.72 nM, 0.97 nM, 2.15 nM, and 1.73 nM, respectively. The developed approach not only has a great potential for developing cost-effective biosensors on affordable substrates for nucleic acid target detection, but also be easily extended to detect other targets by modifying the specific oligonucleotide probes anchored on the electrode.
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Affiliation(s)
- Jinlong Fan
- School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, China; MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China
| | - Hanlin Gong
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China
| | - Fan Wang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China
| | - Li Wang
- Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang 150001, China
| | - Yongsheng Yu
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China
| | - Danqing Liu
- School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, China.
| | - Weiwei Yang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China.
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2
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Siva V, Murugan A, Shameem AS, Jhelai S, Palanivel B, Asaithambi S, GaneshKumar P, Kim I, Govindasamy P, Lee J, Paramasivam S. Rational design of CdS-enwrapped polypyrrole nanoparticles for wastewater treatment: removal of hazardous pollutants in aqueous solutions. Environ Sci Pollut Res Int 2024:10.1007/s11356-024-33285-y. [PMID: 38653896 DOI: 10.1007/s11356-024-33285-y] [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: 11/13/2023] [Accepted: 04/07/2024] [Indexed: 04/25/2024]
Abstract
The modern world requires a chemical industry that can run at low production costs while producing high-quality products with minimal environmental impact. The development of environmentally friendly, cost-effective, and efficient wastewater treatment materials remains a major problem for the sustainable approach. We prepared nanoscale cadmium sulfide (CdS)-enwrapped polypyrrole (PPy) polymer composites for degradation of organic pollutants. The prepared CdS@PPy nanocomposites were characterized by powder X-ray diffraction, scanning electron microscope (SEM), field emission scanning electron microscope (FESEM), Fourier transform infrared spectroscopy (FTIR), and ultraviolet-visible (UV) absorption spectroscopy, indicating proper intercalation between CdS and PPy. Consequently, the catalytic efficiency of the synthesized hybrid nanocomposites was analyzed through the degradation of methylene blue (MB) and rhodamine B (Rh B) under visible light irradiation. The measured degradation efficiency of the dye solutions under the photolysis process is about 18% and 23% for MB and Rh B dye, respectively. Furthermore, the recycle test result concludes that the CdS@PPy composite exhibits 91% and 89% of MB and Rh B dye degradation efficiency even at the 4th cycle, respectively. The positive synergistic impact of CdS and PPy may be the result of effective photocatalytic degradation of MB and RhB.
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Affiliation(s)
- Vadivel Siva
- Department of Physics, Karpagam Academy of Higher Education, Coimbatore, 641 021, India
- Centre for Energy and Environment, Karpagam Academy of Higher Education, Coimbatore, 641 021, India
| | - Anbazhagan Murugan
- Department of Science and Humanities, Karpagam College of Engineering, Coimbatore, 641 032, India
| | - Abdul Samad Shameem
- Centre for Energy and Environment, Karpagam Academy of Higher Education, Coimbatore, 641 021, India
- Department of Science and Humanities, Karpagam Academy of Higher Education, Coimbatore, 641 021, India
| | - Sahadevan Jhelai
- Department of Physics, Karpagam Academy of Higher Education, Coimbatore, 641 021, India
| | - Baskaran Palanivel
- Department of Physics, Bannari Amman Institute of Technology, Sathyamangalam, 638 401, India
| | - Sankaiya Asaithambi
- Nanotechnology Advanced Materials Engineering, Sejong University, Seoul, South Korea
| | - Poongavanam GaneshKumar
- Department of Mechanical Engineering, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Tamil Nadu, Kattankulathur, 603 203, India
| | - Ikhyun Kim
- Department of Mechanical Engineering, Keimyung University, Daegu, 42601, Republic of Korea
| | - Palanisamy Govindasamy
- School of Chemical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan, 38541, Republic of Korea.
| | - Jintae Lee
- School of Chemical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan, 38541, Republic of Korea
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Fadhila FR, Umar A, Chandren S, Apriandanu DOB, Yulizar Y. Biosynthesis of CoCr 2O 4/ZnO nanocomposites using Basella alba L. leaves extracts with enhanced photocatalytic degradation of malachite green in aqueous media. Chemosphere 2024; 352:141215. [PMID: 38253085 DOI: 10.1016/j.chemosphere.2024.141215] [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: 06/30/2023] [Revised: 12/11/2023] [Accepted: 01/12/2024] [Indexed: 01/24/2024]
Abstract
The use of chemical materials to tackle environmental concerns has undergone significant evolution, particularly in the pursuit of strategies for removing pollutants from wastewater as part of environmental remediation an increasingly crucial research topic. Employing green photocatalysts stands out as an efficient and cost-effective approach, playing a key role in promoting sustainable environmental remediation. This study introduces the modification of zinc oxide with cobalt chromite (CoCr2O4/ZnO) through a green synthesis method employing Basella alba L. leaves extract (BALE). Utilizing various characterization techniques, including FT-IR, UV-Vis DRS, XRD, SEM-EDS, and TEM, key features of ZnO, CoCr2O4, and CoCr2O4/ZnO nanocomposites were identified. The optical band gaps for ZnO, CoCr2O4, and CoCr2O4/ZnO nanocomposites were determined as 3.16, 1.71, and 2.80 eV, respectively, where it was shown that the band gap of the ZnO was reduced significantly. CoCr2O4/ZnO nanocomposites displayed a cubic shape of CoCr2O4 on the surface of ZnO, with a particle size of 23.84 ± 8.08 nm. The photocatalytic activity was assessed through the degradation of malachite green under visible light irradiation, where the CoCr2O4/ZnO nanocomposites exhibited superior photodegradation efficiency at 90.91%, surpassing ZnO alone (57.09%). This improvement in photocatalytic activity is attributed to a reduced band gap energy and a high rate constant value of 9.57 × 10-3 min-1, demonstrating pseudo-first-order reaction kinetics. In summary, this research presents the development of a ZnO-based photocatalyst with exceptional performance, especially in the visible light spectrum, making it a promising candidate for applications in wastewater removal.
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Affiliation(s)
- Fathia Rizqa Fadhila
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok, 16424, Indonesia
| | - Aminah Umar
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok, 16424, Indonesia
| | - Sheela Chandren
- Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310, Johor Bahru, Johor, Malaysia
| | - Dewangga Oky Bagus Apriandanu
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok, 16424, Indonesia
| | - Yoki Yulizar
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok, 16424, Indonesia.
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Peng J, Wang B, Cao Z, Zhang Y, Ding L, Cao X, Chang Y, Liu H. Photo-induced adsorption-desorption behavior of methylene blue on CA-BMO under visible light irradiation. Environ Sci Pollut Res Int 2023; 30:110079-110088. [PMID: 37782365 DOI: 10.1007/s11356-023-30103-9] [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: 06/09/2023] [Accepted: 09/23/2023] [Indexed: 10/03/2023]
Abstract
In this work, the modification of Bi2MoO6 with critic acid (CA-BMO) to achieve enhanced adsorption of methylene blue (MB) solution in dark and desorption under visible light irradiation was reported. The as-prepared materials were synthesized by a hydrothermal method and characterized via SEM, FT-IR, XRD, and XPS techniques. Only 16.5% of 10 mg L-1 MB was removed within 10 min by using 0.5 g L-1 Bi2MoO6, while 92.9% removal of MB could be achieved by using 0.5 g L-1 CA-BMO, which enhanced the adsorption removal by a factor of 4.6. The adsorption capacity for MB was 18.9 mg g-1. Desorption efficiency of MB was only observed in CA-BMO system, and it depends on the wavelength of the light source, pH, and the presence of metal ions. Characterization results suggested that carboxyl groups, which were modified onto the surface of Bi2MoO6, could serve as adsorption sites for MB, and the connections were damaged under light, thus leading to the desorption of MB from the surface of the CA-BMO. This study provides a novel reagent-free desorption strategy for dye recovery without secondary pollution, which facilitates the development and application of Bi-based adsorbent for dye-containing wastewater treatment.
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Affiliation(s)
- Jianbiao Peng
- School of Environment, Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, Henan Normal University, Xinxiang, 453007, People's Republic of China
| | - Bingjie Wang
- School of Environment, Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, Henan Normal University, Xinxiang, 453007, People's Republic of China
| | - Zhiguo Cao
- School of Environment, Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, Henan Normal University, Xinxiang, 453007, People's Republic of China
| | - Yakun Zhang
- School of Environment, Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, Henan Normal University, Xinxiang, 453007, People's Republic of China
| | - Li Ding
- School of Environment, Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, Henan Normal University, Xinxiang, 453007, People's Republic of China
| | - Xin Cao
- School of Environment, Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, Henan Normal University, Xinxiang, 453007, People's Republic of China
| | - Yu Chang
- School of Environment, Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, Henan Normal University, Xinxiang, 453007, People's Republic of China
| | - Haijin Liu
- School of Environment, Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, Henan Normal University, Xinxiang, 453007, People's Republic of China.
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Berekute AK, Yu KP, Chuang YHB, Lin KYA. Novel visible-light-active P-g-CN-based α-Bi 2O 3/WO 3 ternary photocatalysts with a dual Z-scheme heterostructure for the efficient decomposition of refractory ultraviolet filters and environmental hormones: Benzophenones. Environ Res 2023; 234:116553. [PMID: 37406722 DOI: 10.1016/j.envres.2023.116553] [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: 05/25/2023] [Revised: 06/24/2023] [Accepted: 07/02/2023] [Indexed: 07/07/2023]
Abstract
The ubiquitous and refractory benzophenone (BP)-type ultraviolet filters, which are also endocrine disruptors, were commonly detected in the aquatic matrix and could not be efficiently removed by conventional wastewater treatment processes, thus causing extensive concern. Herein, a novel ternary nanocomposite, P-g-CN/α-Bi2O3/WO3 (P-gBW), was successfully fabricated by mixing cocalcinated components and applied to the decomposition of BP-type ultraviolet filters. The dual-Z-scheme heterostructure of P-gBW enhances visible-light absorption, efficiently facilitates separation and mobility, and prolongs the lifetime of photoinduced charge carriers via double charge transfer mechanisms. The optimum 95 wt% P-gBW exhibited excellent photocatalytic activity, degrading 96% 4-hydroxy benzophenone (4HBP) within 150 min and 93% 2,2',4,4'-tetrahydroxybenzophenone (BP-2) within 100 min under visible-light illumination, respectively. The pseudo-first-order rate constant of 4HBP (1.15 h-1) was 6.8-, 3.1-, 3.3- and 2.2-fold higher than those of WO3, P-g-CN, α-Bi2O3, and P-g-CN/α-Bi2O3, respectively, while that of BP-2 (1.71 h-1) was 5.2-, 2.2-, 3.2- and 1.5-fold higher, respectively. The improved photocatalytic degradation was attributed to efficient photoinduced charge carrier separation and migration and prevented the recombination of electron holes, as verified by photoluminescence, transient photocurrent response, and electrochemical impedance spectroscopy. Trapping experiments, electron paramagnetic resonance, and band energy position indicated an efficient dual-Z-scheme heterostructure.
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Affiliation(s)
- Abiyu Kerebo Berekute
- International Ph.D. Program in Environmental Science and Technology, National Yang Ming Chiao Tung University, Taipei, 11221, Taiwan; Institute of Environmental and Occupational Health Sciences, National Yang Ming Chiao Tung University, Taipei, 11221, Taiwan; Department of Chemistry, College of Natural and Computational Sciences, Arba Minch University, Arbaminch, Ethiopia
| | - Kuo-Pin Yu
- International Ph.D. Program in Environmental Science and Technology, National Yang Ming Chiao Tung University, Taipei, 11221, Taiwan; Institute of Environmental and Occupational Health Sciences, National Yang Ming Chiao Tung University, Taipei, 11221, Taiwan.
| | - Yi-Hsueh Brad Chuang
- Institute of Environmental Engineering, National Yang Ming Chiao Tung University, Hsinchu City, 30010, Taiwan
| | - Kun-Yi Andrew Lin
- Department of Environmental Engineering and Innovation and Development Center of Sustainable Agriculture & Research Center of Sustainable Energy and Nano Technology, National Chung Hsing University, 250, Kuo-Kuang Road, Taichung, Taiwan
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Kumar A, Raorane CJ, Syed A, Bahkali AH, Elgorban AM, Raj V, Kim SC. Synthesis of TiO 2, TiO 2/PAni, TiO 2/PAni/GO nanocomposites and photodegradation of anionic dyes Rose Bengal and thymol blue in visible light. Environ Res 2023; 216:114741. [PMID: 36347394 DOI: 10.1016/j.envres.2022.114741] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [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: 10/19/2022] [Accepted: 11/03/2022] [Indexed: 06/16/2023]
Abstract
Nowadays, fast-growing industrialization has resulted in the release of enormous amounts of contaminants such as toxic dyes into water bodies and leading to cause health and environmental risks. In this regard, we prepared inorganic nanocomposites for the treatment of toxic dyes. Hence, we synthesized TiO2/PAni/GO nanocomposites and examined them by using XRD, SEM, TEM, UV-Vis spectroscopy, BET analysis, and a photoluminescence investigation. In addition, band gap energies of the nanocomposites were determined, and Total Organic Carbon (TOC) testing was used to determine dye degradation levels. The photocatalytic degradations of Thymol Blue and Rose Bengal dyes were investigated at different dye concentrations, illumination periods, solution pH values, and photocatalyst dosages. By using TiO2/PAni/GO, TiO2/PAni, and TiO2 at neutral pH, a photocatalyst dose of 1600 mg/L, and exposure to visible light, Thymol Blue and Rose Bengal were photodegraded 85-99%, 60-97%, and 10-20%, respectively, at a concentration of 25 ppm (180 min). Reductions in the TOCs confirmed their photodegradation, and a kinetic study revealed photodegradation followed first-order kinetics. This study shows the coating of polyaniline (PAni) and graphene oxide (GO) on TiO2 improved its ability to photodegrade Thymol Blue and Rose Bengal dye.
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Affiliation(s)
- Azad Kumar
- Department of Chemistry, Faculty of Science, Siddharth University, Kapilvastu, Siddharthnagar, (U.P.) 272202, India.
| | | | - Asad Syed
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. 2455, Riyadh, 11451, Saudi Arabia
| | - Ali H Bahkali
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. 2455, Riyadh, 11451, Saudi Arabia
| | - Abdallah M Elgorban
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. 2455, Riyadh, 11451, Saudi Arabia
| | - Vinit Raj
- School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea.
| | - Seong Cheol Kim
- School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea.
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Venkatesan A, Al-Onazi WA, Elshikh MS, Pham TH, Suganya S, Boobas S, Priyadharsan A. Study of synergistic effect of cobalt and carbon codoped with TiO 2 photocatalyst for visible light induced degradation of phenol. Chemosphere 2022; 305:135333. [PMID: 35709834 DOI: 10.1016/j.chemosphere.2022.135333] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 05/30/2022] [Accepted: 06/10/2022] [Indexed: 06/15/2023]
Abstract
In this work, we reported synthesis of cobalt and carbon codoped TiO2 (Co-C-TiO2) nanoparticles were prepared using co-precipitation technique. The synthesized catalysts are analyzed by various methods. The powder XRD pattern confirmed that all the samples were polycrystalline of anatase phase and particle size of resultant nanoparticle was reduced correlated with bare TiO2 sample. FTIR measurements exhibit the identification of functional groups present at the surface of TiO2. FESEM micrograph showed that the shape of codoped TiO2 nanoparticles are approximately sphere. The attained energy gap of Co doped and C codoping of TiO2 modifies to a level below the energy gap of TiO2 anatase specifying a high capability to absorb visible light. The recombination rate of photo-induced electrons and holes for Co-C codoped TiO2 nanoparticles is significantly reduced. The synthesized samples are assessed in degradation of phenol by the illumination of visible light. The results confirmed that photocatalytic activity enhanced due to doping and codoping of Co and C. As a result, Co-C codoped TiO2 nanoparticles exhibited a higher visible-light photocatalytic activity in compared with Co-TiO2 and bare TiO2 with the maximum degradation efficiency of 98, 75 and 15%, respectively. And also, the reusability of the catalyst was proved when 95% degradation could be achieved after consecutive batches. It is predictable that this work will provide new insights to increase the visible light active photocatalysts for environmental problems.
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Affiliation(s)
- A Venkatesan
- Department of Physics, Annai College of Arts and Sciences (Affiliated to Bharthidasan University), Trichy, Kovilacheri, Kumbakonam, 612503, Tamilnadu, India
| | - Wedad A Al-Onazi
- Department of Chemistry, College of Science, King Saud University, P.O. Box 22452, Riyadh, 11495, Saudi Arabia
| | - Mohamed S Elshikh
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Thi Huong Pham
- Department of Materials Science and Engineering, Gachon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam, 13120, South Korea
| | - S Suganya
- Department of Physics, NKR Government Arts College for Women, Namakkal, 637001, Tamilnadu, India
| | - S Boobas
- Department of Physics, Sri Vasavi College, Bhavani, 638301, Tamilnadu, India.
| | - A Priyadharsan
- Department of Physics, E.R.K Arts and Science College, Dharmapuri, 636905, Tamilnadu, India.
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Khor CM, Khan MM, Khan A, Khan MY, Harunsani MH. Zr, La-dual doped silver niobate for photocatalytic degradation of dyes under visible light irradiation. Heliyon 2022; 8:e10264. [PMID: 36051264 DOI: 10.1016/j.heliyon.2022.e10264] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 04/18/2022] [Accepted: 08/08/2022] [Indexed: 11/22/2022] Open
Abstract
Sol-gel-assisted synthesis of silver niobate, 1%, 5%, and 10% Zr, La-dual doped silver niobates were carried out. Analysis done using XRD showed that increasing Zr and La dual doping caused the synthesized materials to adopt an AgNbO3-like structure. This is also supported by FT-IR results. FESEM revealed that the silver niobate has a prism-like morphology while Zr, La-dual doped samples are irregular in shape. EDX mapping of the 10% Zr, La dual silver niobate confirmed the presence of Nb, Ag, Zr, and La metals. When compared with the silver niobate, the band gap energy of Zr, La-dual doped silver niobates are narrower, as shown by UV-Vis DRS measurements. It was revealed that dual doping of silver niobates with Zr and La has significantly improved the photocatalytic degradation of methylene blue (MB) and Rhodamine B (RhB) dyes. The 1% Zr, La-dual doped silver niobate showed the best photocatalytic results in terms of degrading MB while 10% Zr, La-dual doped silver niobate achieved the best performance when degrading RhB.
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Liu W, Kang Q, Wang L, Wen L, Li Z. Improved performance of Zn-doped SnO 2 modified g-C 3N 4 for visible light-driven photocatalysis. Environ Sci Pollut Res Int 2022; 29:51989-52002. [PMID: 35257335 DOI: 10.1007/s11356-022-19581-5] [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: 07/27/2021] [Accepted: 03/02/2022] [Indexed: 06/14/2023]
Abstract
The low-cost composite of g-C3N4 modified by Zn-doped SnO2 nanoparticles was prepared for the first time in this work. The characterization results of XRD and SEM demonstrated that Zn was successfully doped into SnO2. The formed Sn-O-Zn bonds and interaction between the Zn-doped SnO2 sample and g-C3N4 in the composite were explored by FT-IR and XPS technologies. Photocatalytic degradation experiments showed that the as-prepared optimal composite photocatalyst displayed enhanced photocatalytic reactivity towards both dyes and antibiotics, which could degrade 85.6% of RhB and 86.8% of tetracycline within 30 and 90 min, respectively. The oxygen vacancies formed in SnO2 after Zn doping could capture the photogenerated electrons of g-C3N4, thereby promoting the separation of photogenerated electron-hole pairs, then more ·O2- and holes can be generated during the visible light-driven photocatalytic reaction, so that the composite of Zn-doped SnO2/g-C3N4 acquired higher photocatalytic activity and accelerated the degradation of target organics. Active species capturing experiments and ESR detection results also confirmed that ·O2- and holes were the main active species in the reaction process. This work developed a novel g-C3N4-based photocatalyst with no noble metal, low price, and high photocatalytic activity, which could provide a cost-effective and high-efficiency strategy for wastewater treatment.
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Affiliation(s)
- Wei Liu
- Faculty of Resources and Environmental Science, Hubei University, Wuhan, 430062, China
- Hubei Engineering Research Center for Rural Drinking Water Safety, Wuhan, 430062, China
| | - Qun Kang
- Faculty of Resources and Environmental Science, Hubei University, Wuhan, 430062, China.
- Hubei Engineering Research Center for Rural Drinking Water Safety, Wuhan, 430062, China.
| | - Ling Wang
- Faculty of Resources and Environmental Science, Hubei University, Wuhan, 430062, China
- Hubei Engineering Research Center for Rural Drinking Water Safety, Wuhan, 430062, China
| | - Lilian Wen
- Faculty of Resources and Environmental Science, Hubei University, Wuhan, 430062, China
- Hubei Engineering Research Center for Rural Drinking Water Safety, Wuhan, 430062, China
| | - Zhaohua Li
- Faculty of Resources and Environmental Science, Hubei University, Wuhan, 430062, China
- Hubei Engineering Research Center for Rural Drinking Water Safety, Wuhan, 430062, China
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Sreeram N, Aruna V, Koutavarapu R, Lee DY, Shim J. Visible-light-driven indium vanadium oxide nanosheets supported bismuth tungsten oxide nanoflakes heterostructure as an efficient photocatalyst for the tetracycline degradation. Chemosphere 2022; 299:134477. [PMID: 35367491 DOI: 10.1016/j.chemosphere.2022.134477] [Citation(s) in RCA: 4] [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: 02/12/2022] [Revised: 03/16/2022] [Accepted: 03/28/2022] [Indexed: 06/14/2023]
Abstract
The development of excellent photocatalysts is of great significance for the efficient photocatalytic degradation process, however, the low carrier separation efficiency and poor light absorption ability typically limit the performance of photocatalysts. Herein, a visible light responsive heterostructure composed with indium vanadium oxide nanosheets supported bismuth tungsten oxide nanoflakes (InVO4/Bi2WO6) was synthetized through in-situ hydrothermal method. Further, the photocatalytic activity was performed for tetracycline (TC) under visible light illumination. The InVO4/Bi2WO6 heterostructure builds a strong interface between InVO4 and Bi2WO6 to hinder reunion of photoinduced charge carriers, and provides the sensitive agents for the removal of TC. In particular, the InVO4/Bi2WO6 photocatalyst prepared by taking 5.0 mg of Bi2WO6 shows the highest degradation of TC about 97.42% in 72 min. The quenching experiments identified that hydroxyl radicals, and holes dominated in the photocatalytic process. Furthermore, the optimized nanocomposite is stable even after four cycles, which exposes the excellent photostability and reusability of the photocatalyst. In addition, a plausible degradation pathway and mechanism of TC over InVO4/Bi2WO6 nanocomposite is also projected.
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Affiliation(s)
- N Sreeram
- Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar, Guntur, 522 510, Andhra Pradesh, India
| | - V Aruna
- Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar, Guntur, 522 510, Andhra Pradesh, India; Department of Physics, Bapatla Engineering College, Bapatla, 522 102, Andhra Pradesh, India.
| | - Ravindranadh Koutavarapu
- Department of Robotics Engineering, College of Mechanical and IT Engineering, Yeungnam University, Gyeongsan, 38541, Republic of Korea.
| | - Dong-Yeon Lee
- Department of Robotics Engineering, College of Mechanical and IT Engineering, Yeungnam University, Gyeongsan, 38541, Republic of Korea.
| | - Jaesool Shim
- School of Mechanical Engineering, Yeungnam University, Gyeongsan, 38541, Republic of Korea.
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11
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Liu S, Wu D, Hu J, Zhao L, Zhao L, Yang M, Feng Q. Electrospun flexible core-sheath PAN/PU/β-CD@Ag nanofiber membrane decorated with ZnO: enhance the practical ability of semiconductor photocatalyst. Environ Sci Pollut Res Int 2022; 29:39638-39648. [PMID: 35107732 DOI: 10.1007/s11356-022-18928-2] [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: 10/25/2021] [Accepted: 01/24/2022] [Indexed: 06/14/2023]
Abstract
It is necessary to effectively separate photocatalytic materials from water bodies and reuse catalysts for industrial wastewater treatment. Herein, a novel nanofiber membrane with enhanced light absorption and reusability of photocatalytic materials was prepared. The three-dimensional porous structure of the nanofibers helps the photocatalyst efficiently degrade pollutants. Specifically, a high-efficiency photocatalyst carrier with a nanofiber structure (PAN/PU/β-CD@Ag nanofiber membrane) was prepared by electrospinning and a simple silver plating process, and then ZnO NPs were synthesized in situ on the nanofiber membrane during the hydrothermal process. Under visible-light irradiation, the ZnO-loaded PAN/PU/β-CD@Ag nanofiber membranes exhibited excellent photocatalytic performance for the degradation of methylene blue (MB, 71.5%) and tetracycline hydrochloride (TCH, 70.5%). Additionally, a possible pathway of charge migration in this system was proposed. This design may provide a new idea for the preparation of visible-light photocatalytic nanofiber membranes and their treatments of wastewater containing dyes and hormones.
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Affiliation(s)
- Suo Liu
- School of Textile and Garment, Anhui Polytechnic University, Wuhu, Anhui, 241000, People's Republic of China
| | - Dingsheng Wu
- School of Textile and Garment, Anhui Polytechnic University, Wuhu, Anhui, 241000, People's Republic of China
| | - Jinyan Hu
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, People's Republic of China
| | - Lingling Zhao
- School of Textile and Garment, Anhui Polytechnic University, Wuhu, Anhui, 241000, People's Republic of China
| | - Lei Zhao
- School of Textile and Garment, Anhui Polytechnic University, Wuhu, Anhui, 241000, People's Republic of China
| | - Maohuan Yang
- School of Textile and Garment, Anhui Polytechnic University, Wuhu, Anhui, 241000, People's Republic of China
| | - Quan Feng
- School of Textile and Garment, Anhui Polytechnic University, Wuhu, Anhui, 241000, People's Republic of China.
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12
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Shi H, Xie Y, Wang W, Zhang L, Zhang X, Shi Y, Fan J, Tang Z. In-situ construction of step-scheme MoS 2/Bi 4O 5Br 2 heterojunction with improved photocatalytic activity of Rhodamine B degradation and disinfection. J Colloid Interface Sci 2022; 623:500-512. [PMID: 35597019 DOI: 10.1016/j.jcis.2022.04.148] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [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: 01/02/2022] [Revised: 04/19/2022] [Accepted: 04/25/2022] [Indexed: 01/24/2023]
Abstract
In this paper, a novel Step-scheme MoS2/Bi4O5Br2 heterojunction was fabricated through the in-situ mechanical agitation method and the photocatalytic activity of that was examined by the photocatalytic degradation Rhodamine B (RhB) and inactivation of E.coli under visible light irradiation (λ > 420 nm). The Step-scheme MoS2/Bi4O5Br2 heterojunctions displayed the enhanced photocatalytic ability compared to pure Bi4O5Br2 and MoS2 and the MoS2/Bi4O5Br2-3% (MS/BOB-3) heterojunction exhibited the strongest photocatalytic activity which can completely inactivate the 1 × 107 cfu/mL with 180 min and degrade RhB (10 mg/L) with 24 min visible light irradiation, respectively. The photocatalytic mechanism of the MoS2/Bi4O5Br2 heterojunction is was attributed to the generated active species (h+, ·O2- and ·OH) which can effectively destroy RhB molecular and cell-membrane of bacterial as demonstrated by multiple techniques such as LC-MS and fluorescence stain. Additionally, characterization results disclosed that the transfer pathway of charge carriers of constructed MoS2/Bi4O5Br2 heterojunction followed the Step-scheme channel, which not only facilitated the separation and migration of the photo-generated charge carriers, but also improved the light absorption ability of the samples and resulting in the promoted photocatalytic performance of MoS2/Bi4O5Br2 heterojunction. This work paves a new idea to develop novel bismuth oxyhalide-based photocatalytic system for wastewater purification.
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Affiliation(s)
- Huanxian Shi
- School of Pharmacy, Shaanxi University of Chinese Medicine, Xianyang 712046, PR China; Shaanxi University of Chinese Medicine/Shaanxi Provice Key Laboratory of New Drugs and Chinese Medicine Foundation Research, Pharmacy College. Xianyang 9712083, PR China; Shaanxi University of Chinese Medicine/Shaanxi Collaborative Innovation Center of Idustrialization of Tradition Chinese Medicine Resources, Xianyang 712083, PR. China
| | - Yundong Xie
- School of Pharmacy, Shaanxi University of Chinese Medicine, Xianyang 712046, PR China
| | - Wei Wang
- School of Pharmacy, Shaanxi University of Chinese Medicine, Xianyang 712046, PR China
| | - Lihua Zhang
- School of Pharmacy, Shaanxi University of Chinese Medicine, Xianyang 712046, PR China; Shaanxi University of Chinese Medicine/Shaanxi Provice Key Laboratory of New Drugs and Chinese Medicine Foundation Research, Pharmacy College. Xianyang 9712083, PR China
| | - Xiaofei Zhang
- School of Pharmacy, Shaanxi University of Chinese Medicine, Xianyang 712046, PR China
| | - Yajun Shi
- School of Pharmacy, Shaanxi University of Chinese Medicine, Xianyang 712046, PR China; Shaanxi University of Chinese Medicine/Shaanxi Provice Key Laboratory of New Drugs and Chinese Medicine Foundation Research, Pharmacy College. Xianyang 9712083, PR China
| | - Jun Fan
- College of Food Science and Engineering, Northwest University, Xi'an 710069, PR China.
| | - Zhishu Tang
- School of Pharmacy, Shaanxi University of Chinese Medicine, Xianyang 712046, PR China; Shaanxi University of Chinese Medicine/Shaanxi Collaborative Innovation Center of Idustrialization of Tradition Chinese Medicine Resources, Xianyang 712083, PR. China.
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13
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Yu C, Yu L, Mohamed A, Fang J, Wu Y, Dai K, Cai P, Huang Q. Size-dependent visible-light-enhanced Cr(VI) bioreduction by hematite nanoparticles. Chemosphere 2022; 295:133633. [PMID: 35041817 DOI: 10.1016/j.chemosphere.2022.133633] [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: 10/11/2021] [Revised: 01/09/2022] [Accepted: 01/12/2022] [Indexed: 06/14/2023]
Abstract
Light irradiation would affect the electron transfer between dissimilatory metal-reducing bacteria (DMRB) and semiconducting minerals, which may impose a great influence on the biogeochemistry cycle of heavy metals. However, the size effect of semiconducting minerals on the its electron transfer with DMRB and microbial Cr(VI) reduction under visible light irradiation is little known. Herein, the Cr(VI) reduction by Shewanella oneidensis MR-1 (MR-1) was investigated in the presence of hematite nanoparticles with average diameters of 10 nm and 50 nm in dark and under visible light irradiation. It is found that hematite nanoparticles adhered onto MR-1 cells to form the composites, leading to the decrease in surface sites and Zeta potential. Hematite mediated-Cr(VI) bioreduction rate under visible light irradiation was 0.342 h-1, which is 3.4 folds enhancement compared with that in dark and 4.4 folds compared with the MR-1 alone under visible light irradiation. Decreasing nanoparticle size of hematite from 50 nm to 10 nm promoted the Cr(VI) reduction under visible light irradiation but impeded it in dark. It was deduced that the bioelectrons from MR-1 could promote the separation of photoelectron-hole pairs of light-irradiated hematite, which consequently enhanced the Cr(VI) bioreduction by MR-1-hematite composites. Moreover, mutant strains experiments demonstrated the vital role of c-cytochrome for the conducting network actively established by MR-1 with hematite nanoparticles. Those findings expand the understanding of the electron transfer pathway for enhancing Cr(VI) reduction by hematite-MR-1 composites, and the impact of particle size on the interaction between semiconducting mineral and electroactive bacteria under light irradiation.
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Affiliation(s)
- Cheng Yu
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, PR China
| | - Lu Yu
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, PR China
| | - Abdelkader Mohamed
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, PR China; Soil and Water Res. Department, Nuclear Research Center, Atomic Energy Authority, Abou Zaabl, 13759, Egypt
| | - Jun Fang
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, PR China
| | - Yichao Wu
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, PR China
| | - Ke Dai
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, PR China.
| | - Peng Cai
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, PR China
| | - Qiaoyun Huang
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, PR China
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14
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Pandiyan R, Dharmaraj S, Ayyaru S, Sugumaran A, Somasundaram J, Kazi AS, Samiappan SC, Ashokkumar V, Ngamcharussrivichai C. Ameliorative photocatalytic dye degradation of hydrothermally synthesized bimetallic Ag-Sn hybrid nanocomposite treated upon domestic wastewater under visible light irradiation. J Hazard Mater 2022; 421:126734. [PMID: 34365234 DOI: 10.1016/j.jhazmat.2021.126734] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [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: 03/31/2021] [Revised: 07/11/2021] [Accepted: 07/21/2021] [Indexed: 06/13/2023]
Abstract
Industrial and textile dyes are the major source of water pollutants in the Coimbatore Districts of Tamil Nadu, India. The highly stable organic dyes from these industries are being discharged untreated into neighboring rivers, lakes, and ponds. Thus, the present study mainly focused on the preparation of bimetallic nanocomposite (Ag-Sn) through Free-facile Teflon autoclave methodology and their subsequent stimulation has given to the photocatalyst by visible light irradiation. This visible light stimulates and irradiates the photocatalysts from steady state to the excited state and might help in absorption of the nanosized dye materials and organic matter. The nanocomposite was characterized using UV, FTIR, Zeta-sizer, XRD and FE-SEM. These parameters exhibited significant lattice structures with an average size of 127.6 nm. Further the nanocomposite treated samples were tested for water quality parameters like TDS, BOD, COD, heavy metals, sedimentation rate and bacterial population. Likewise, the samples irradiated with visible light for photocatalytic activity exhibited a significant intensity of C/C0 at 0.42 and 0.28. The treated water used for green gram seedling assay exhibited significant growth. Scavengers from Ag-Sn bimetallic nanocomposite plays the major role in dye degradation. The results clearly suggest that Ag-Sn bimetallic nanocomposite can be used for wastewater treatment and the subsequent treated water can be utilized for agriculture purposes.
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Affiliation(s)
- Rajesh Pandiyan
- Centre for Materials Engineering and Regenerative Medicine, Bharath Institute of Higher Education and Research, Bharath University (Deemed to be University) Selaiyur, Chennai 600073, Tamil Nadu, India.
| | - Selvakumar Dharmaraj
- Department of Marine Biotechnology, AMET University, Chennai 603103, Tamil Nadu, India
| | - Sivasankaran Ayyaru
- Environmental Biology Laboratory, Department of Civil Engineering, Yeungnam University, Gyungsan 712-749, South Korea
| | - Abimanyu Sugumaran
- Department of Pharmaceutics, SRM College of Pharmacy, SRM Institute of Science and Technology, Kattankulathur, Chennai 603203, Tamil Nadu, India
| | - Jeevasree Somasundaram
- Department of Biochemistry, Karpagam Academy of Higher Education, Karpagam University, Coimbatore 641021, Tamil Nadu, India
| | - Amsa Samreen Kazi
- Department of Biochemistry, Karpagam Academy of Higher Education, Karpagam University, Coimbatore 641021, Tamil Nadu, India
| | - Sumathi C Samiappan
- Department of Chemistry and Biosciences, Srinivasa Ramanujan Centre, SASTRA University, Kumbakonam 612001, Tamil Nadu, India
| | - Veeramuthu Ashokkumar
- Center of Excellence in Catalysis for Bioenergy and Renewable Chemicals (CBRC), Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
| | - Chawalit Ngamcharussrivichai
- Center of Excellence in Catalysis for Bioenergy and Renewable Chemicals (CBRC), Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; Center of Excellence on Petrochemical and Materials Technology (PETROMAT), Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand
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15
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Xu K, Jiao L, Wang C, Bu Y, Tang Y, Qiu L, Zhang Q, Wang L. Nonylphenol photodegradation by novel ternary MIL-100(Fe)/ZnFe 2O 4/PCN composite under visible light irradiation via double charge transfer process. J Environ Sci (China) 2022; 111:93-103. [PMID: 34949377 DOI: 10.1016/j.jes.2021.03.020] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [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: 11/13/2020] [Revised: 03/10/2021] [Accepted: 03/11/2021] [Indexed: 06/14/2023]
Abstract
Nonylphenol (NP) residues, as a typical endocrine disrupting chemical (EDC), frequently exist in sewage, surface water, groundwater and even drinking water, which poses a serious threat to human health due to its bioaccumulation. In order to remove NP, a series of MIL-100(Fe)/ZnFe2O4/flake-like porous carbon nitride (MIL/ZC) was synthesized through in-situ synthesis at room temperature. High performance of ternary MIL/ZC is used to degrade NP under visible light irradiation. The results show that 30MIL/ZC2 (20 wt.% ZnFe2O4) ternary composite had the best photocatalytic activity (99.84%) when the dosage was 30 mg. Further mechanism analysis shows that the excellent photocatalytic activity of 30MIL/ZC2 could be ascribed to the double charge transfer process between flake-like porous carbon nitride (PCN) and other catalysts in the ternary heterojunction, and the separation of photogenerated electron-hole pairs was more effective. In addition, the 30MIL/ZC2 also showed high stability after five cycles of the photodegradation reaction. Furthermore, the active substance (•O2-) was considered to be the main active substance in the NP degradation process. Based on the research results, the possible photocatalytic reaction mechanism of 30MIL/ZC2 ternary composite was proposed and discussed in detail.
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Affiliation(s)
- Kailin Xu
- School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China
| | - Li Jiao
- School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China
| | - Chuqiao Wang
- School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China
| | - Yiming Bu
- School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China
| | - Yuling Tang
- School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China
| | - Liwei Qiu
- Changzhou Cheff Environmental Protection Technology Co., Ltd., Changzhou 213164, China
| | - Qiuya Zhang
- School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China
| | - Liping Wang
- School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China.
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16
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Tinelli R, Ravelli D, Basso A, Tarantino SC, Capaldo L. Catalyst-free [2 + 2] photocycloadditions between benzils and olefins under visible light. Photochem Photobiol Sci 2021. [PMID: 34792791 DOI: 10.1007/s43630-021-00129-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Accepted: 10/27/2021] [Indexed: 10/19/2022]
Abstract
The catalyst-free [2 + 2] photocycloaddition between benzils and simple olefins is reported. The adoption of visible light proved essential for the transformation, as shorter wavelengths led to uncontrolled decomposition. When cyclic olefins were used, the reaction occurred smoothly to afford the expected oxetanes regio- and stereoselectively after 24 h of irradiation. In contrast, in the case of acyclic olefins, longer reaction times were typically required and small amounts (ca. 20%) of [4 + 2] photocycloadducts and by-products deriving from competitive hydrogen atom abstraction were observed. The selectivity of the transformation could be consistently improved by decreasing the reaction temperature, thus restoring the desired [2 + 2] reactivity. An overall mechanistic picture is also offered based on the chemical and photophysical quenching experiments and the stereochemical output is rationalized based on Griesbeck models.
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17
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Hu Z, Xu T, Liu P, Oeser M. Microstructures and optical performances of nitrogen-vanadium co-doped TiO 2 with enhanced purification efficiency to vehicle exhaust. Environ Res 2021; 193:110560. [PMID: 33279493 DOI: 10.1016/j.envres.2020.110560] [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: 06/09/2020] [Revised: 11/25/2020] [Accepted: 11/27/2020] [Indexed: 06/12/2023]
Abstract
Titanium dioxide (TiO2) is widely used to purify air pollutants in environmental engineering, but it is only activated by ultraviolet (UV) light. The metal or nonmetal single doping of TiO2 cannot observably improve the purification efficiency of TiO2 under visible light. To further increase the photocatalytic activity and purification efficiency of TiO2 on vehicle exhaust under visible light, nitrogen (N)-vanadium (V) co-doped TiO2 was first prepared. The influences of N-V co-doping on phase structures, morphology, microstructures, electronic structures, and photo-absorption performances were then observed and examined using X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-visible light diffuse reflectance spectra. Purification efficiency and reaction rates of N-V co-doped TiO2 on NOx, HC, CO and CO2 in vehicle exhaust were studied using a purification test system under UV and visible light irradiations, respectively. Results indicate that N and V are synchronously doped into the crystal structures of TiO2 to replace O and Ti, respectively. N and V show the synergistic co-doping effect to suppress the grain growth of TiO2 and improve the dispersity and specific surface area of TiO2. Also, the N-V co-doping introduces more lattice distortions and defects in the crystal lattices of TiO2. Further, N presents in the form of Ti-O-N and O-Ti-N bonds, and V exists in the form of V5+ and V4+. These form the impurity energy level in the band gap to narrow the energy band of TiO2. Additionally, the N-V co-doping broadens the photoabsorption threshold of TiO2 from 387 nm to 611 nm. These results show that N-V co-doping increases the photocatalytic activity of TiO2. Finally, the N-V co-doped TiO2 shows higher catalytic purification efficiency on NOx and HC under UV and visible light. The N-V co-doping obviously increases the purification efficiency of TiO2 on CO and CO2 when exposed to visible light, and their reversible reactions are not found. The N-V co-doping of TiO2 is a feasible approach to purify vehicle exhaust under visible light irradiations.
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Affiliation(s)
- Zhihui Hu
- College of Civil Engineering, Nanjing Forestry University, 159 Longpan Road, Nanjing, Jiangsu, 210037, China; Institute of Highway Engineering, RWTH Aachen University, Mies van-der-Rohe Street 1, 52074, Aachen, Germany.
| | - Tao Xu
- College of Civil Engineering, Nanjing Forestry University, 159 Longpan Road, Nanjing, Jiangsu, 210037, China.
| | - Pengfei Liu
- Institute of Highway Engineering, RWTH Aachen University, Mies van-der-Rohe Street 1, 52074, Aachen, Germany
| | - Markus Oeser
- Institute of Highway Engineering, RWTH Aachen University, Mies van-der-Rohe Street 1, 52074, Aachen, Germany
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18
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Khaled B, Nassira Z, Imene H. Eco-friendly synthesis of self-regenerative low-cost biosorbent by the incorporation of CuO: a photocatalyst sensitive to visible light irradiation for azo dye removal. Environ Sci Pollut Res Int 2020; 27:31074-31091. [PMID: 32524399 DOI: 10.1007/s11356-020-09364-1] [Citation(s) in RCA: 4] [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: 02/13/2020] [Accepted: 05/18/2020] [Indexed: 06/11/2023]
Abstract
Acid pretreated biomass Lemna minor (BM-H3PO4) was used as support for CuO nanoparticles loading, to investigate the dye biosorption capacity and the photocatalytic performance under artificial visible light. The surface morphology, crystal structure, elemental composition, and the bandgap of modified biomass have been determined using FE-SEM, XRD, EDX, XPS, FTIR, and UV-DR analysis. The results showed that NH2 and P-O functional groups of (BM-H3PO4) can attract the copper ions (Cu2+), which can facilitate the loading of CuO nanoparticles hence, smaller nanoparticles with an average diameter of 21 nm was obtained. It was also found that when the CuO was incorporated in BM-H3PO4 in a proper mass ratio of 0.4, the biosorption efficiency was enhanced to 3 times compared with BM-H3PO4 and reached a maximum of 91%, at a dye concentration of 20 mg/L, solution pH equal to 5, and an ambient temperature of 25 °C. Furthermore, CuO-modified BM-H3PO4 exhibits a better photocatalytic activity than pure CuO in the presence of H2O2 and visible light irradiation, where the dye was completely removed and mineralized after 240 min, evidenced by COD measurement. The photocatalytic regeneration also shows that the biosorption efficiency was maintained at 91% over 3 cycles, indicating the significant self-regenerative capacity of the biosorbent.
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Affiliation(s)
- Benabbas Khaled
- Laboratory of Organic Synthesis-Modeling and Optimization of Chemical Processes, Department of Process Engineering, Faculty of Engineering, Badji Mokhtar-Annaba University, P.O. Box 12, 23000, Annaba, Algeria.
| | - Zabat Nassira
- Laboratory of Organic Synthesis-Modeling and Optimization of Chemical Processes, Department of Process Engineering, Faculty of Engineering, Badji Mokhtar-Annaba University, P.O. Box 12, 23000, Annaba, Algeria
| | - Hocini Imene
- Laboratory of Organic Synthesis-Modeling and Optimization of Chemical Processes, Department of Process Engineering, Faculty of Engineering, Badji Mokhtar-Annaba University, P.O. Box 12, 23000, Annaba, Algeria
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Zhang L, Li P, Feng L, Chen X, Jiang J, Zhang S, Zhang C, Zhang A, Chen G, Wang H. Synergetic Ag 2S and ZnS quantum dots as the sensitizer and recognition probe: A visible light-driven photoelectrochemical sensor for the "signal-on" analysis of mercury (II). J Hazard Mater 2020; 387:121715. [PMID: 31780293 DOI: 10.1016/j.jhazmat.2019.121715] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 11/05/2019] [Accepted: 11/17/2019] [Indexed: 06/10/2023]
Abstract
A visible-light-driven photoelectrochemical (PEC) sensor has been developed for the "signal-on" analysis of Hg2+ by the synergetic combination of low-bandgap Ag2S and wide-bandgap ZnS quantum dots (QDs). Ag2S QDs were synthesized with bead-chain-like structure by the self-assembly route and further covalently bound with ZnS QDs to be coated onto the indium tin oxide (ITO) electrodes. It was discovered that the ZnS@Ag2S-modified electrodes could display the visible-light-driven PEC behavior, of which Ag2S and ZnS QDs could act as the PEC sensitizer and Hg2+-recognition probe, respectively. More importantly, the photocurrent responses of the developed electrodes could be specifically turned on in the presence of Hg2+ under the visible-light irradiation, presumably due to that Hg2+ might conduct a Zn-to-Hg exchange on ZnS QDs to trigger the formation of HgS/ZnS@Ag2S heterojunction towards the enhanced electron-hole separation. The as-prepared PEC sensor could facilitate the detection of Hg2+ with concentrations ranging from 0.010-1000 nM, with a detection limit of about 1.0 pM. Besides, the feasibility of practical applications of the developed PEC analysis strategy was verified by probing Hg2+ in environmental water samples. Such a visible-light-driven PEC detection platform with the unique "turn-on" signal output may promise for the extensive applications for Hg2+ evaluation.
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Affiliation(s)
- Lixiang Zhang
- School of Environment, Harbin Institute of Technology, Harbin, Heilongjiang 150090, PR China; Institute of Medicine and Materials Applied Technologies, College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, PR China
| | - Pan Li
- Institute of Medicine and Materials Applied Technologies, College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, PR China
| | - Luping Feng
- Institute of Medicine and Materials Applied Technologies, College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, PR China; School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, PR China
| | - Xi Chen
- Institute of Medicine and Materials Applied Technologies, College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, PR China; School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, PR China
| | - Jiatian Jiang
- Institute of Medicine and Materials Applied Technologies, College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, PR China
| | - Sheng Zhang
- Institute of Medicine and Materials Applied Technologies, College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, PR China
| | - Chunxian Zhang
- Institute of Medicine and Materials Applied Technologies, College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, PR China
| | - Anchao Zhang
- School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, PR China
| | - Guofu Chen
- School of Environment, Harbin Institute of Technology, Harbin, Heilongjiang 150090, PR China.
| | - Hua Wang
- School of Environment, Harbin Institute of Technology, Harbin, Heilongjiang 150090, PR China; Institute of Medicine and Materials Applied Technologies, College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, PR China; School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, PR China.
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Saffari R, Shariatinia Z, Jourshabani M. Synthesis and photocatalytic degradation activities of phosphorus containing ZnO microparticles under visible light irradiation for water treatment applications. Environ Pollut 2020; 259:113902. [PMID: 31918149 DOI: 10.1016/j.envpol.2019.113902] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [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: 10/16/2019] [Revised: 12/12/2019] [Accepted: 12/29/2019] [Indexed: 06/10/2023]
Abstract
A series of phosphorus containing ZnO (P-ZnO) photocatalysts with various percentages of phosphorus were successfully synthesized using the hydrothermal method. The structural, physical and optical properties of the obtained microparticles were investigated using diverse techniques such as X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, ultraviolet-visible diffusion reflectance spectroscopy (UV-Vis DRS), photoluminescence (PL) spectroscopy, transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS) and N2 adsorption-desorption analysis. The photocatalytic activities of the pure and P-ZnO samples were evaluated for the degradation of Rhodamine B (RhB) under visible light irradiation. The parameters such as pH, catalyst dosage, contaminant concentration and effect of persulfate as an oxidant were studied. It was found that the P-ZnO1.8% photocatalyst could destroy 99% of RhB (5 ppm) in 180 min at pH = 7; furthermore, it degraded ∼100% of 5 and 10 ppm of the RhB pollutant in 120 and 180 min, respectively, only by adding 0.01 g of persulfate into the reaction solution. To determine the photocatalytic mechanism, 2-propanol, benzoquinone and EDTA were used and it was indicated that hydroxyl radicals, superoxide ions and holes, all had major roles in the photocatalytic degradation but the hydroxyl radical effect was the most significant. The phenol degradation was also investigated using the P-ZnO1.8% optimum photocatalyst which could destroy 53% of the phenol (5 ppm) in 180 min. According to the reusability test, it was proved that after 5 cycles, the catalyst activity was not highly changed and it was potentially capable of pollutant degradation.
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Affiliation(s)
- Reyhaneh Saffari
- Department of Chemistry, Amirkabir University of Technology (Tehran Polytechnic), P.O.Box:15875-4413, Tehran, Iran
| | - Zahra Shariatinia
- Department of Chemistry, Amirkabir University of Technology (Tehran Polytechnic), P.O.Box:15875-4413, Tehran, Iran.
| | - Milad Jourshabani
- Department of Chemistry, Amirkabir University of Technology (Tehran Polytechnic), P.O.Box:15875-4413, Tehran, Iran
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Tho NTM, Khanh DNN, Thang NQ, Lee YI, Phuong NTK. Novel reduced graphene oxide/ZnBi 2O 4 hybrid photocatalyst for visible light degradation of 2,4-dichlorophenoxyacetic acid. Environ Sci Pollut Res Int 2020; 27:11127-11137. [PMID: 31955328 DOI: 10.1007/s11356-020-07752-1] [Citation(s) in RCA: 6] [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: 10/03/2019] [Accepted: 01/14/2020] [Indexed: 06/10/2023]
Abstract
A new highly efficient rGO/ZnBi2O4 hybrid catalyst has been successfully synthesized through oxidation-reduction and co-precipitation methods, followed by heating at 450 °C. The obtained rGO/ZnBi2O4 catalyst was characterized by X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The catalytic activity of rGO/ZnBi2O4 under visible light irradiation was tested using 2,4-dichlorophenoxyacetic acid (2,4-D) in aqueous solution. The rGO/ZnBi2O4 hybrid catalyst containing 2% rGO (2.0rGO/ZnBi2O4) showed the best catalytic performance. More than 90% of 2,4-D in a 30 mg/L solution was degraded after 120 min of visible light irradiation using 2.0rGO/ZnBi2O4 at 1.0 g/L concentration. Moreover, the 2.0rGO/ZnBi2O4 catalyst showed excellent stability over four consecutive cycles, with no significant changes in the photocatalytic degradation rate. This study demonstrated that rGO/ZnBi2O4 may be a promising, low-cost, and green photocatalyst for environmental remediation applications.
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Affiliation(s)
- Nguyen Thi Mai Tho
- Chemical Engineering Faculty, Industrial University of Ho Chi Minh City, Ho Chi Minh City, Vietnam
| | - Dang Nguyen Nha Khanh
- Hochiminh city Institute of Resources Geography, Vietnam Academy of Science and Technology, 01 Mac Dinh Chi, District 1, Ho Chi Minh City, Vietnam
- Department of Chemistry, Changwon National University, Changwon, 641-773, South Korea
| | - Nguyen Quoc Thang
- Chemical Engineering Faculty, Industrial University of Ho Chi Minh City, Ho Chi Minh City, Vietnam
| | - Yong-Ill Lee
- Department of Chemistry, Changwon National University, Changwon, 641-773, South Korea.
| | - Nguyen Thi Kim Phuong
- Hochiminh city Institute of Resources Geography, Vietnam Academy of Science and Technology, 01 Mac Dinh Chi, District 1, Ho Chi Minh City, Vietnam.
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam.
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Wei F, Li J, Dong C, Bi Y, Han X. Plasmonic Ag decorated graphitic carbon nitride sheets with enhanced visible-light response for photocatalytic water disinfection and organic pollutant removal. Chemosphere 2020; 242:125201. [PMID: 31677514 DOI: 10.1016/j.chemosphere.2019.125201] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [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: 07/25/2019] [Revised: 10/21/2019] [Accepted: 10/22/2019] [Indexed: 05/10/2023]
Abstract
Photocatalytic disinfection with high performance is thought to be a promising way for water purification. Herein, plasmonic Ag doped urea-derived graphitic carbon nitride (g-C3N4) composites were fabricated via in-situ photo-deposition at room temperature as the visible-light photocatalyst. Scan electron microscopy and transmission electron microscopy images showed the uniform dispersion of Ag nanoparticles on the surface of g-C3N4 sheet, which facilitated the synergistic effect of antibacterial performance from Ag and photocatalytic property from Ag/g-C3N4 composites. Photocatalytic water disinfection against Escherichia coli with visible light was performed to demonstrate the improved photocatalytic property with assistance of Ag. The 3-Ag/g-C3N4 exhibited the best bactericidal performance by inactivating all bacteria within 120 min with damaged cell membranes of Escherichia coli observed by scan electron microscopy and transmission electron microscopy images. Photoluminescence spectra, steady-state surface photovoltage spectra, photocurrent response, and electrochemical impedance spectra results revealed that Ag nanoparticles inhibited the recombination of photo-generated e- and h+ pairs and further reinforced the photocatalytic performance of g-C3N4. Scavenger experiments indicated that h+ produced on valence band of g-C3N4 dominated the photocatalytic disinfection process against Escherichia coli. This work further proved Ag/g-C3N4 showed great potential in photocatalytic water disinfection under visible-light irradiation.
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Affiliation(s)
- Feng Wei
- State Key Laboratory of Urban Water Resource and Environment School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Jiadong Li
- State Key Laboratory of Urban Water Resource and Environment School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Changchang Dong
- State Key Laboratory of Urban Water Resource and Environment School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Yajun Bi
- State Key Laboratory of Urban Water Resource and Environment School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Xiaojun Han
- State Key Laboratory of Urban Water Resource and Environment School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China.
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Shi H, Fan J, Zhao Y, Hu X, Zhang X, Tang Z. Visible light driven CuBi 2O 4/Bi 2MoO 6 p-n heterojunction with enhanced photocatalytic inactivation of E. coli and mechanism insight. J Hazard Mater 2020; 381:121006. [PMID: 31442686 DOI: 10.1016/j.jhazmat.2019.121006] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [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: 05/20/2019] [Revised: 08/05/2019] [Accepted: 08/12/2019] [Indexed: 05/21/2023]
Abstract
Here, a novel CuBi2O4/Bi2MoO6 (CBO/BMO) p-n heterojunction was fabricated and exhibited markedly improved photocatalytic inactivation capacity of E. coli cells under visible light excitation (λ > 420 nm) compared with pure CuBi2O4 and Bi2MoO6. The CBO/BMO-0.5 hybrid displayed the highest photoinactivation ability which could completely inactivate the E. coli cellswithin 4 h. The mechanism of photocatalytic disinfection towards E. coli of CBO/BMO heterojunctions was attributed to the disruption of cell-membrane, leakage and damage of cellular content including total protein and DNA as verified with SEM, fluorescence-base dead/live stain, sodium dodecyl sulfate polyacrylamide gel electropheresis (SDS-PAGE) and agarose gel electrophoresis (AGE). Additionally, the scavenge experiments showed that the reactive species h+, e- and •O2-play the predominant role in the photocatalytic system of CBO/BMO hybrids. The improved photocatalytic activity of CBO/BMO composites was mainly attributed to the promotion of spatial separation and migration rate of photoproduced electron-hole pairs, enhancement of visible light absorption and more generation of reactive species (•O2-) on the interface of catalyst and water which was demonstrated by nitroblue tetrazolium (NBT) and EPR. Our work indicated that construction of CuBi2O4/Bi2MoO6 p-n heterostructure photocatalyst is a promising environmental friendly alternative method to deal with the biohazards of pathogenic microorganisms.
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Affiliation(s)
- Huanxian Shi
- School of Chemical Engineering, Northwest University, Xi'an, 710069, PR China
| | - Jun Fan
- College of Food Science and Engineering, Northwest University, Xi'an 710069, PR China.
| | - Yanyan Zhao
- School of Chemical Engineering, Northwest University, Xi'an, 710069, PR China
| | - Xiaoyun Hu
- School of Physics, Northwest University, Xi'an, 710069, PR China
| | - Xu Zhang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, PR China
| | - Zhishu Tang
- Shaanxi University of Chinese Medicine/Shaanxi collaborative Innovation Center of Idustrialization of Tradition Chinese Medicine Resources, Xianyang 712083, PR China.
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Hayashi S, Kakizaki E, Sonoda A, Shinkawa N, Shiragami T, Yukawa N. Acceleration effect of the forensic luminol reaction induced by visible light irradiation of whole human blood aqueous solutions. Forensic Sci Int 2019; 299:208-14. [PMID: 31042626 DOI: 10.1016/j.forsciint.2019.04.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 04/05/2019] [Accepted: 04/06/2019] [Indexed: 11/22/2022]
Abstract
The first quantitative study on the effect of visible light irradiation on the luminol reaction, used forensically, was conducted using whole human blood aqueous solutions (hemolytic state) and an LED lamp. Whole human blood aqueous solutions under an air atmosphere were irradiated with visible light, resulting in the maximum chemiluminescence (CL) intensity (@ 440 nm) increasing about 1.7-fold due to acceleration of the luminol reaction rate. No acceleration effect was observed under an argon (Ar) atmosphere, or under an air atmosphere in the presence of sodium azide (NaN3; a scavenger of singlet oxygen (1O2)). Furthermore, no conversion from Fe(II) hemoglobin to Fe(III) hemoglobin (methemoglobin) was observed in the absorption spectrum following irradiation. We suggest that these effects are due to easier approach of the luminol reagents to heme following damage of the globin protein around the heme, or damage to the red blood cell membrane, induced by 1O2 generated by an excited state of heme.
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25
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Yu P, Zhou X, Yan Y, Li Z, Zheng T. Enhanced visible-light-driven photocatalytic disinfection using AgBr-modified g-C 3N 4 composite and its mechanism. Colloids Surf B Biointerfaces 2019; 179:170-179. [PMID: 30959229 DOI: 10.1016/j.colsurfb.2019.03.074] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [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: 11/01/2018] [Revised: 03/08/2019] [Accepted: 03/31/2019] [Indexed: 11/25/2022]
Abstract
In this study, novel AgBr-modified g-C3N4 (AgBr/g-C3N4) photocatalysts were prepared by an adsorption-deposition method and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET), and ultraviolet-visible spectroscopy (UV-vis). Furthermore, the photocatalytic disinfection performance on Escherichia coli (ATCC 15597) was investigated. The as-prepared photocatalysts exhibited well crystalline structures and morphologies with C3N4 and exhibited a stronger bacterial inactivation than that of pristine g-C3N4. The disinfection efficiency reached up to 4.80 log under 150 min of visible light irradiation when AgBr-modified g-C3N4 was prepared at a molar ratio of 1:5 (AgBr: g-C3N4), which was a 4.2 log increase compared with that of pristine g-C3N4 under the same experimental conditions. The enhancement of the photocatalytic activity of AgBr/g-C3N4 was attributed to the effective production and transfer of the photo-induced electrons under visible light irradiation, since the AgBr modification reduced the bandgap energy and boarded the visible light area. Furthermore, h+ was found to be the dominant contributor for bacterial inactivation. The h+ and photo-generated reactive oxygen species (ROSs) damaged the cell membranes and destroyed metabolic processes, resulting in leakage of potassium ions and proteins, lipid peroxidation, degradation of intracellular protein, and a reduction of the ATP levels, which finally lead to bacterial death. These results provide a theoretical basis for the development of low-cost, high-efficiency photocatalysts for green/sustainable water disinfection.
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Affiliation(s)
- Peng Yu
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, PR China; Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China
| | - Xiaoqin Zhou
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, PR China; Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China.
| | - Yichang Yan
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, PR China; Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China
| | - Zifu Li
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, PR China; Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China.
| | - Tianlong Zheng
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Haidian District, Beijing 100085, PR China
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26
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Balati A, Tek S, Nash K, Shipley H. Nanoarchitecture of TiO 2 microspheres with expanded lattice interlayers and its heterojunction to the laser modified black TiO 2 using pulsed laser ablation in liquid with improved photocatalytic performance under visible light irradiation. J Colloid Interface Sci 2019; 541:234-248. [PMID: 30690267 DOI: 10.1016/j.jcis.2019.01.082] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [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: 10/29/2018] [Revised: 01/17/2019] [Accepted: 01/18/2019] [Indexed: 10/27/2022]
Abstract
Different morphologies and crystal phases of black titanium dioxide (TiO2) were synthesized using Pulsed Laser Ablation in Liquid (PLAL). The synthesized laser modified black TiO2 (LMB-TiO2) structures included hydrogenated anatase TiO2 nanoparticles, as the core shell structures, and TiO2 microspheres. TiO2 core-shell nanoparticles, which had crystalline-disordered structures, demonstrated the laser ablation pulse duration-dependence growth of amorphous shells and hence formation of disordered TiO2 nanoparticles with different thickness of hydrogen-doped amorphous shells were shown. TiO2 microspheres with the yolk-shell like structures (YSHL-TiO2 microspheres), on the other hand, showed the formation of rutile phases in the shell which encapsulate Lattice Expanded Planes (LEPs) in the core. The microspheres demonstrated phase transitions from anatase to rutile and size-dependent lattice interlayers expansion from 0.35 nm to 0.94 nm. The maximum particle size growth occurred when the samples were subjected to the laser ablation for 120 min. The crystal phase transition, consequently, led to the formation of heterostructured photocatalysts through construction of hydrogenated anatase TiO2 nanoparticles junctions with rutile TiO2 microspheres. The photocatalytic degradation of methylene blue (MB) using LMB-TiO2 heterostructure was tested under visible light irradiation Results showed approximately 99% of MB was degraded after 60 min. Enhanced visible light absorption and increased charge carrier lifetime due to formation of different types of heterojunctions may explain the higher photocatalytic performance of LM-TiO2 samples. Moreover, the Photoluminescence analysis indicated that hydroxyl radicals were the main active species involved in the photocatalytic degradation tests and therefore the photocatalysis mechanism was accordingly suggested.
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Affiliation(s)
- Ali Balati
- Department of Civil and Environmental Engineering, University of Texas at San Antonio, San Antonio, TX, USA
| | - Sumeyra Tek
- Department of Physics and Astronomy, The University of Texas at San Antonio, San Antonio, TX, USA
| | - Kelly Nash
- Department of Physics and Astronomy, The University of Texas at San Antonio, San Antonio, TX, USA
| | - Heather Shipley
- Department of Civil and Environmental Engineering, University of Texas at San Antonio, San Antonio, TX, USA.
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Ma Z, Zhang M, Guo J, Liu W, Tong M. Facile synthesis of ZrO 2 coated BiOCl 0.5I 0.5 for photocatalytic oxidation-adsorption of As(III) under visible light irradiation. Chemosphere 2018; 211:934-942. [PMID: 30119025 DOI: 10.1016/j.chemosphere.2018.08.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [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: 05/18/2018] [Revised: 07/31/2018] [Accepted: 08/01/2018] [Indexed: 06/08/2023]
Abstract
ZrO2 modified BiOCl0.5I0.5 composites (ZBCI), synthesized via a facile precipitation method at room temperature, were utilized to photocatalytically oxidize and adsorb arsenite from water under visible light irradiation. The composites were well characterized by using various techniques. With visible light irradiation, 5 mg L-1 of As(III) could be completely removed by ZBCI (0.25 g L-1) in 90 min. Particularly, we found that ZBCI composites not only could oxidize As(III) into As(V) with visible light irradiation, but also could effectively capture the generated As(V), leading to the negligible residual As(III) or As(V) in aqueous solutions after 90 min treatment. In the fabricated composites, ZrO2 acted as the main adsorption sites while BiOCl0.5I0.5 served as the primary photocatalysis center. Because of the heterostructure of ZBCI, e- generated by BiOCl0.5I0.5 would be transferred to ZrO2 and inhibited e--h+ recombination rate, contributing to the improved photocatalytic efficiency. ZBCI could effectively remove As(III) over a broad range of pH from 3 to 11. Chloride and nitrate did not obviously affect the photocatalytic As(III) removal, while sulfate and phosphate yet reduced the capture of As(III). Moreover, ZBCI composites exhibited high photocatalytic As(III) removal efficiency during the fourth reused cycles. The facile synthesized ZBCI could be employed to capture and oxidize As(III) from water.
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Affiliation(s)
- Zhiyao Ma
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China
| | - Mengya Zhang
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China
| | - Jingyuan Guo
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China
| | - Wen Liu
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China
| | - Meiping Tong
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China.
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28
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Han X, Han Z, Li J, Zhao J, Zhao X. Coordinative integration of copper (II) and iron (II) phthalocyanine into amidoximated PAN fiber for enhanced photocatalytic activity under visible light irradiation. J Colloid Interface Sci 2019; 533:333-43. [PMID: 30172144 DOI: 10.1016/j.jcis.2018.08.076] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 08/16/2018] [Accepted: 08/22/2018] [Indexed: 11/23/2022]
Abstract
Metal phthalocyanine (MPc) complexes hold great promise for photocatalysis applications because of their high visible light harvesting efficiency and semiconductive properties. However, the effective development requires the suppression of their rapid charge recombination. Transition metal ions can act as electron traps to enhance the charge separation of semiconductors, but challenges still remain for bimetallic co-catalysis of MPc due to the difficulties in the combination between them. Herein, we proposed a new approach to enable the assisted metal ions to interact with MPc through fibrous support, constructing a novel bimetallic photocatalyst via simultaneously immobilizing iron(II) phthalocyanine (FePc) and Cu(II) onto the surface of amidoximated polyacrylonitrile (PAN) fiber. Taking the photodegradation of organic dyes as model reactions, this bimetallic catalyst achieves much higher photoactivity than that of the monometallic FePc catalyst, and effectively converts surface H2O2 into hydroxyl radicals rather than superoxide radicals and high-valent metal-oxo species. The Cu(II) not only enables the transfer of photoexcited electrons from FePc, but also promotes the running of Fe(II)/Fe(III) cycle to boost reactive radicals generation through H2O2 activation. The strategy of coupling Cu(II) with MPc through fibrous support provides a facile and promising solution for the advancement of MPc-based photocatalysis via visible light energy.
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Dhanabal R, Velmathi S, Bose AC. Fabrication of RuO 2-Ag 3PO 4 heterostructure nanocomposites: Investigations of band alignment on the enhanced visible light photocatalytic activity. J Hazard Mater 2018; 344:865-874. [PMID: 29190584 DOI: 10.1016/j.jhazmat.2017.11.034] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Revised: 11/09/2017] [Accepted: 11/17/2017] [Indexed: 06/07/2023]
Abstract
The RuO2-Ag3PO4 heterostructured nanocomposite was successfully synthesized by facile in situ deposition of porous ruthenium oxide (RuO2) nanoparticles on the surface of the silver phosphate (Ag3PO4). Under visible light irradiation, the 0.5wt.% RuO2-Ag3PO4 heterostructure photocatalyst exhibits enhanced photocatalytic efficiency compared to other composites of RuO2-Ag3PO4 and Ag3PO4. The optimized 0.5wt.% RuO2-Ag3PO4 nanocomposites exhibited 1.5 times enhanced photocatalytic activity towards the degradation of methylene blue (MB) than Ag3PO4. Moreover, the degradation rate of 0.5wt.% RuO2-Ag3PO4 nanocomposite towards the cationic dyes MB and rhodamine B (RhB) was nearly 6.6 times and 4.7 times higher than that towards the anionic dye methyl orange (MO). The formed heterojunction electric field of 310mV at the interface between RuO2 and Ag3PO4 heterostructure induces downward band bending of Ag3PO4. Also, this electric field increases the separation efficiency of electrons-holes resulting higher degradation efficiency. The quenching effect of scavengers test confirms that holes are reactive species and the RuO2-Ag3PO4 nanocomposite is highly stable, exhibited 88% of MB degradation after 4 recycles. The RuO2-Ag3PO4 nanocomposites inhibit self oxidation of Ag3PO4 resulting improved efficiency and stability.
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Affiliation(s)
- Rengasamy Dhanabal
- Nanomaterials Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli, 620 015, India
| | - Sivan Velmathi
- Organic and Polymer Synthesis Laboratory, Department of Chemistry, National Institute of Technology, Tiruchirappalli, 620 015, India
| | - Arumugam Chandra Bose
- Nanomaterials Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli, 620 015, India.
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Wang X, Han Q, Yu N, Wang T, Wang C, Yang R. GO-AgCl/Ag nanocomposites with enhanced visible light-driven catalytic properties for antibacterial and biofilm-disrupting applications. Colloids Surf B Biointerfaces 2017; 162:296-305. [PMID: 29216517 DOI: 10.1016/j.colsurfb.2017.11.060] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [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: 06/03/2017] [Revised: 11/17/2017] [Accepted: 11/22/2017] [Indexed: 10/18/2022]
Abstract
Nanomaterials with visible light-driven photocatalytic activity have attracted much attention due to their excellent abilities in degradation of various organic pollutants as well as inactivating bacteria. Herein, graphene oxide (GO) enwrapped silver chloride/silver (AgCl/Ag) nanocomposites with high visible light absorption were designed and fabricated as efficient antibacterial agents. AgCl NPs were synthesized in the presence of GO first and Ag NPs were coated on AgCl surface by heat reduction to form GO-AgCl/Ag nanocomposites. The as prepared nanocomposites revealed improved stability, higher absorption properties in the visible light region. The enhanced antibacterial activity was observed by quantification of colony forming units (CFU) and morphological changes of bacteria. The antibacterial mechanism of GO-AgCl/Ag was also investigated by evaluating membrane permeability and ROS level. Moreover, GO-AgCl/Ag composites can eliminate bacterial biofilms more efficiently under visible light irradiation. Our results provide new insights into the design of new multifunctional systems for antibacterial applications.
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Affiliation(s)
- Xinhuan Wang
- Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center of Excellence for Nanoscience, National Center for Nanoscience and Technology, UCAS, Beijing 100190, China
| | - Qiusen Han
- Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center of Excellence for Nanoscience, National Center for Nanoscience and Technology, UCAS, Beijing 100190, China; Sino-Danish College, Sino-Danish Center for Education and Research, UCAS, Beijing, 100190, China
| | - Ning Yu
- Chinese PLA General Hospital, Beijing 100853, China.
| | - Tian Wang
- Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center of Excellence for Nanoscience, National Center for Nanoscience and Technology, UCAS, Beijing 100190, China; Sino-Danish College, Sino-Danish Center for Education and Research, UCAS, Beijing, 100190, China
| | - Chen Wang
- Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center of Excellence for Nanoscience, National Center for Nanoscience and Technology, UCAS, Beijing 100190, China; Sino-Danish College, Sino-Danish Center for Education and Research, UCAS, Beijing, 100190, China.
| | - Rong Yang
- Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center of Excellence for Nanoscience, National Center for Nanoscience and Technology, UCAS, Beijing 100190, China; Sino-Danish College, Sino-Danish Center for Education and Research, UCAS, Beijing, 100190, China.
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31
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Ju L, Wu P, Lai X, Yang S, Gong B, Chen M, Zhu N. Synthesis and characterization of Fullerene modified ZnAlTi-LDO in photo-degradation of Bisphenol A under simulated visible light irradiation. Environ Pollut 2017; 228:234-244. [PMID: 28549332 DOI: 10.1016/j.envpol.2017.05.038] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [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: 12/28/2016] [Revised: 04/09/2017] [Accepted: 05/15/2017] [Indexed: 05/12/2023]
Abstract
In this study, ZnAlTi layered double hydroxide (ZnAlTi-LDH) combined with fullerene (C60) was fabricated by the urea method, and calcined under vacuum atmosphere to obtain nanocomposites of C60-modified ZnAlTi layered double oxide (ZnAlTi-LDO). The morphology, structure and composition of the nanocomposites were analyzed by Scanning Electron Microscopy, High-resolution transmission electron microscopy, X-ray diffraction patterns, Fourier transform infrared and specific surface area. The UV-vis diffuse reflectance spectra indicated that the incorporation of C60 expanded the absorption of ZnAlTi-LDO to visible-light region. The photo-degradation experiment was conducted by using a series of C60 modified ZnAlTi-LDO with different C60 weight percentage to degrade Bisphenol A (BPA) under simulated visible light irradiation. In this experiment, the degradation rate of C60 modified ZnAlTi-LDO in photo-degradation of BPA under simulated visible light irradiation was over 80%. The intermediates formed in the degradation of BPA process by using LDO/C60-5% were 4-hydroxyphenyl-2-propanol, 4-isopropenylphenol and Phenol. Photogenerated holes, superoxide radical species, ·OH and singlet oxygen were considered to be responsible for the photodegradation process, among which superoxide radical species and ·OH played a predominant role in the photocatalytic reaction system. C60 modified ZnAlTi-LDO catalysts for photocatalytic reduction shows great potential in degradation of organic pollutants and environmental remediation.
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Affiliation(s)
- Liting Ju
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Guangzhou 510006, PR China
| | - Pingxiao Wu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Guangzhou 510006, PR China.
| | - Xiaolin Lai
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Guangzhou 510006, PR China
| | - Shanshan Yang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Guangzhou 510006, PR China
| | - Beini Gong
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Guangzhou 510006, PR China
| | - Meiqing Chen
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, Guangzhou 510006, PR China
| | - Nengwu Zhu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China; Guangdong Environmental Protection Key Laboratory of Solid Waste Treatment and Recycling, Guangzhou 510006, PR China
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Gao S, Guo C, Hou S, Wan L, Wang Q, Lv J, Zhang Y, Gao J, Meng W, Xu J. Photocatalytic removal of tetrabromobisphenol A by magnetically separable flower-like BiOBr/BiOI/Fe 3O 4 hybrid nanocomposites under visible-light irradiation. J Hazard Mater 2017; 331:1-12. [PMID: 28242523 DOI: 10.1016/j.jhazmat.2017.02.030] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 02/16/2017] [Accepted: 02/17/2017] [Indexed: 05/15/2023]
Abstract
A novel flower-like three-dimensional BiOBr/BiOI/Fe3O4 heterojunction photocatalyst was synthesized using a simple in situ co-precipitation method at room temperature. The hybrid composites were characterized by a couple of techniques including X-ray powder diffraction, scanning electron microscope, transmission electron microscopy, ultraviolet-visible diffuse reflection spectroscopy, Brunauer-Emmett-Teller, X-ray photo-electron spectroscopy, photoluminescence technique, and vibrating sample magnetometer. Fe3O4 nanoparticles were perfectly loaded on the surface of BiOBr/BiOI microspheres. The recyclable magnetic BiOBr/BiOI/Fe3O4 was employed to degrade TBBPA under visible light irradiation. The optimal removal efficiency of the ternary BiOBr/BiOI/Fe3O4 (2:2:0.5) nanocomposite reached up to 98.5% for TBBPA in aqueous solution. The superior photocatalytic activity of BiOBr/BiOI/Fe3O4 was mainly ascribed to large surface area and appropriate energy gaps, resulting in the effective adsorption and separation of electrons-hole pairs. The photogenerated reactive species determined by free radicals trapping experiments revealed that the excellent catalytic activity was primarily driven by O2- radical. The photocatalytic degradation kinetics and a detailed mechanism were also proposed. Result demonstrated that the BiOBr/BiOI/Fe3O4 can be magnetically recycled, and maintain high photocatalytic activity after reuse over five cycles. It suggested that the synthesized material had a potentially promising application for TBBPA removal by photocatalytic degradation from wastewater.
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Affiliation(s)
- Shengwang Gao
- Department of Chemistry, College of Science, North University of China, Taiyuan 030051, China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Changsheng Guo
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Song Hou
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Li Wan
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Qiang Wang
- Heilongjiang Research Academy of Environmental Sciences, Harbin 150056, China
| | - Jiapei Lv
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Yuan Zhang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Jianfeng Gao
- Department of Chemistry, College of Science, North University of China, Taiyuan 030051, China
| | - Wei Meng
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Jian Xu
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
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Starling MCVM, Castro LAS, Marcelino RBP, Leão MMD, Amorim CC. Optimized treatment conditions for textile wastewater reuse using photocatalytic processes under UV and visible light sources. Environ Sci Pollut Res Int 2017; 24:6222-6232. [PMID: 26865484 DOI: 10.1007/s11356-016-6157-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [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: 11/27/2015] [Accepted: 01/20/2016] [Indexed: 06/05/2023]
Abstract
In this study, photo-Fenton systems using visible light sources with iron and ferrioxalate were tested for the DOC degradation and decolorization of textile wastewater. Textile wastewaters originated after the dyeing stage of dark-colored tissue in the textile industry, and the optimization of treatment processes was studied to produce water suitable for reuse. Dissolved organic carbon, absorbance, turbidity, anionic concentrations, carboxylic acids, and preliminary cost analysis were performed for the proposed treatments. Conventional photo-Fenton process achieved near 99 % DOC degradation rates and complete absorbance removal, and no carboxylic acids were found as products of degradation. Ferrioxalate photo-Fenton system achieved 82 % of DOC degradation and showed complete absorbance removal, and oxalic acid has been detected through HPLC analysis in the treated sample. In contrast, photo-peroxidation with UV light was proved effective only for absorbance removal, with DOC degradation efficiency near 50 %. Treated wastewater was compared with reclaimed water and had a similar quality, indicating that these processes can be effectively applied for textile wastewater reuse. The results of the preliminary cost analysis indicated costs of 0.91 to 1.07 US$ m-3 for the conventional and ferrioxalate photo-Fenton systems, respectively. Graphical Abstract ᅟ.
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Affiliation(s)
- Maria Clara V M Starling
- Department of Sanitary and Environmental Engineering, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - Luiz Augusto S Castro
- Department of Sanitary and Environmental Engineering, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - Rafaela B P Marcelino
- Department of Sanitary and Environmental Engineering, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - Mônica M D Leão
- Department of Sanitary and Environmental Engineering, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - Camila C Amorim
- Department of Sanitary and Environmental Engineering, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Belo Horizonte, Minas Gerais, 31270-901, Brazil.
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Wu W, Lv X, Wang J, Xie J. Integrating AgI/AgBr biphasic heterostructures encased by few layer h-BN with enhanced catalytic activity and stability. J Colloid Interface Sci 2017; 496:434-445. [PMID: 28254610 DOI: 10.1016/j.jcis.2017.02.046] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [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: 11/24/2016] [Revised: 02/13/2017] [Accepted: 02/19/2017] [Indexed: 11/19/2022]
Abstract
Using freshly prepared water-soluble KBr crystal as facile, low-cost sacrificial template, AgBr nanocubes were synthesized through one-pot precipitation method, then navy bean shaped AgI/AgBr biphasic heterostructures were synthesized through anion-exchange reaction and encased within few-layer h-BN to obtain final product. The obtained heterostructured AgI/AgBr/h-BN composite without plasmonic noble metal nanoparticles was used as stable and high active photocatalyst for dye degradation under visible light irradiation, comparing both with self-prepared normal AgBr, AgBr cubes, AgI/AgBr navy beans and other related catalysts reported in the literature. The significant boosting of activity was attributed to the formation of AgI/AgBr interface and the coupling of few-layer h-BN, the latter of which not only effectively suppresses the reduction of silver ions but greatly enhance the charge separation. Furthermore, it was suggested that the photogenerated holes and superoxide radical were the main active species according to photoelectron chemical measurements, electron spin resonance spin-trap analysis and radical trapping experiments. Finally, the possible mechanism of enhanced photocatalytic activity and stability was discussed and proposed. The work demonstrates that engineering Ag-based semiconductor coupling with h-BN would profit the design strategy for low-cost, solar-driven photocatalysts.
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Affiliation(s)
- Wen Wu
- Department of Chemistry, Zhou Kou Normal University, Henan 466001, PR China
| | - Xiaomeng Lv
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
| | - Jiaxi Wang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Jimin Xie
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
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Ma C, Wang F, Zhang C, Yu Z, Wei J, Yang Z, Li Y, Li Z, Zhu M, Shen L, Zeng G. Photocatalytic decomposition of Congo red under visible light irradiation using MgZnCr-TiO 2 layered double hydroxide. Chemosphere 2017; 168:80-90. [PMID: 27776241 DOI: 10.1016/j.chemosphere.2016.10.063] [Citation(s) in RCA: 30] [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: 07/08/2016] [Revised: 10/04/2016] [Accepted: 10/18/2016] [Indexed: 06/06/2023]
Abstract
The new nanophotocatalyst MgZnCr-TiO2 was prepared by co-precipitation under different molar ratio of metals (Zn:Cr) and the loaded amount of TiO2. And it was characterized by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy et al. Langmuir model fitted well the adsorption isotherm with the value of R2 0.9765, the maximum adsorption capacity was 526.32 mg g-1, the adsorption followed pseudo second order kinetic by MgZnCr-TiO2 (1:1:2-0.05). The photocatalytic oxidation of Congo red was used to determine the photocatalytic performance of MgZnCr-TiO2 (1:1:2-0.05) under visible light irradiation, and the removal rate reached 98% after reaction for 40 min. The degradation mechanism of Congo red also was proposed, and the MgZnCr-TiO2 (1:1:2-0.05) was stable after five cycles. Compared to the adsorption, Congo red was removed fundamentally by photocatalysis and it is expected to be an effective way to eliminate Congo red.
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Affiliation(s)
- Chi Ma
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China
| | - Fenghua Wang
- Institute of Physical Education, Xinjiang Normal University, Urumqi, 830054, China
| | - Chang Zhang
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China.
| | - Zhigang Yu
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China
| | - Jingjing Wei
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China
| | - Zhongzhu Yang
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China
| | - Yongqiu Li
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China
| | - Zihao Li
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China
| | - Mengying Zhu
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China
| | - Liuqing Shen
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China
| | - Guangming Zeng
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China
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Ouyang K, Dai K, Chen H, Huang Q, Gao C, Cai P. Metal-free inactivation of E. coli O157:H7 by fullerene/C 3N 4 hybrid under visible light irradiation. Ecotoxicol Environ Saf 2017; 136:40-45. [PMID: 27810579 DOI: 10.1016/j.ecoenv.2016.10.030] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [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: 07/19/2016] [Revised: 10/24/2016] [Accepted: 10/25/2016] [Indexed: 05/21/2023]
Abstract
Interest has grown in developing safe and high-performance photocatalysts based on metal-free materials for disinfection of bacterial pathogens under visible light irradiation. In this paper, the C60/C3N4 and C70/C3N4 hybrids were synthesized by a hydrothermal method, and characterized by X-ray diffraction (XRD), UV-vis diffuse reflection spectroscopy (UV-vis DRS), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and high revolution transmission electron microscope (HRTEM). The performance of photocatalytic disinfection was investigated by the inactivation of Escherichia coli O157:H7. Both C60/C3N4 and C70/C3N4 hybrids showed similar crystalline structure and morphology with C3N4; however, the two composites exhibited stronger bacterial inactivation than C3N4. In particular, C70/C3N4 showed the highest bactericidal efficiency and was detrimental to all E. coli O157:H7 in 4h irradiation. Compared to C3N4, the enhancement of photocatalytic activity of composites could be attributed to the effective transfer of the photoinduced electrons under visible light irradiation. Owing to the excellent performance of fullerenes (C60, C70)/C3N4 composites, a visible light response and environmental friendly photocatalysts for disinfection were achieved.
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Affiliation(s)
- Kai Ouyang
- State Key Laboratory of Agricultural Microbiology, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Ke Dai
- State Key Laboratory of Agricultural Microbiology, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Hao Chen
- College of Science, Huazhong Agricultural University, Wuhan 430070, China
| | - Qiaoyun Huang
- State Key Laboratory of Agricultural Microbiology, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Chunhui Gao
- State Key Laboratory of Agricultural Microbiology, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Peng Cai
- State Key Laboratory of Agricultural Microbiology, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.
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Lu N, Yeh YP, Wang GB, Feng TY, Shih YH, Chen D. Dye-sensitized TiO 2-catalyzed photodegradation of sulfamethoxazole under blue or yellow light. Environ Sci Pollut Res Int 2017; 24:489-499. [PMID: 27730507 DOI: 10.1007/s11356-016-7815-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [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: 07/15/2016] [Accepted: 10/03/2016] [Indexed: 06/06/2023]
Abstract
Visible light-induced photocatalysis is potentially advantageous and could be an efficient approach to degrade contaminants because it can be used to selectively target specific wavelength for decomposition of organic contaminants in water and wastewater. This study demonstrates the photodegradation of sulfamethoxazole (SMX) using [Pt(3,3'-dicarboxy-2,2'-bpy)(1,2-benzenedithiolate)] (Complex 1)-sensitized and [Pt(4,4'-dicarboxy-2,2'-bpy)(1,2-benzenedithiolate)] (Complex 2)-sensitized titanium dioxide (TiO2) under blue or yellow light (420 or 580 nm, respectively) irradiation in water. The Complex 1-sensitized TiO2 photocatalytic oxidation of SMX reached almost 100 % removal under 420 nm irradiation for 3 h in water. In addition, the formation of hydroxyl radicals can be facilitated by bubbling O2 during the photodegradation in which an effective decomposition of SMX was observed. Based on HPLC and UV-Vis studies of the decomposed products, it was found that SMX underwent cleavage of aromatic rings during the photodegradation process.
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Affiliation(s)
- Norman Lu
- Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei, Taiwan.
| | - Yun-Peng Yeh
- Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei, Taiwan
| | - Guan-Bo Wang
- Department of Agricultural Chemistry, National Taiwan University, Taipei, Taiwan
| | - Tsung-Yao Feng
- Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei, Taiwan
| | - Yang-Hsin Shih
- Department of Agricultural Chemistry, National Taiwan University, Taipei, Taiwan.
| | - Dong Chen
- Department of Civil and Mechanical Engineering, Indiana University-Purdue University, 2101 E Coliseum Blvd, Fort Wayne, IN, 46805, USA.
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Wongaree M, Chiarakorn S, Chuangchote S, Sagawa T. Photocatalytic performance of electrospun CNT/TiO 2 nanofibers in a simulated air purifier under visible light irradiation. Environ Sci Pollut Res Int 2016; 23:21395-21406. [PMID: 27502566 DOI: 10.1007/s11356-016-7348-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [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: 04/25/2016] [Accepted: 07/29/2016] [Indexed: 06/06/2023]
Abstract
The photocatalytic treatment of gaseous benzene under visible light irradiation was developed using electrospun carbon nanotube/titanium dioxide (CNT/TiO2) nanofibers as visible light active photocatalysts. The CNT/TiO2 nanofibers were fabricated by electrospinning CNT/poly(vinyl pyrrolidone) (PVP) solution followed by the removal of PVP by calcination at 450 °C. The molar ratio of CNT/TiO2 was fixed at 0.05:1 by weight, and the quantity of CNT/TiO2 loaded in PVP solution varied between 30 and 60 % wt. CNT/TiO2 nanofibers have high specific surface area (116 m2/g), significantly higher than that of TiO2 nanofibers (44 m2/g). The photocatalytic performance of the CNT/TiO2 nanofibers was investigated by decolorization of 1 × 10-5 M methylene blue (MB) dye (in water solution) and degradation of 100 ppm gaseous benzene under visible light irradiation. The 50-CNT/TiO2 nanofibers (calcined CNT/TiO2 nanofibers fabricated from a spinning solution of 50 % wt CNT/TiO2 based on PVP) had higher MB degradation efficiency (58 %) than did other CNT/TiO2 nanofibers and pristine TiO2 nanofibers (15 %) under visible light irradiation. The photocatalytic degradation of gaseous benzene under visible light irradiation on filters made of 50-CNT/TiO2 nanofibers was carried out in a simulated air purifier system. Similar to MB results, the degradation efficiency of gaseous benzene by 50-CNT/TiO2 nanofibers (52 %) was higher than by other CNT/TiO2 nanofibers and pristine TiO2 nanofibers (18 %). The synergistic effects of the larger surface area and lower band gap energy of CNT/TiO2 nanofibers were presented as strong adsorption ability and greater visible light adsorption. The CNT/TiO2 nanofiber prepared in this study has potential for use in air purifiers to improve air treatment efficiency with less energy.
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Affiliation(s)
- Mathana Wongaree
- The Joint Graduate School of Energy and Environment, King Mongkut's University of Technology Thonburi, 126 Prachauthit Rd., Bangmod, Thungkru, Bangkok, 10140, Thailand
- Centre of Excellence on Energy Technology and Environment, Science and Technology Postgraduate Education and Research Development Office, Bangkok, Thailand
| | - Siriluk Chiarakorn
- Division of Environmental Technology, School of Energy, Environment and Materials, King Mongkut's University of Technology Thonburi, 126 Prachauthit Rd., Bangmod, Thungkru, Bangkok, 10140, Thailand.
- Nanotec-KMUTT Center of Excellence on Hybrid Nanomaterials for Alternative Energy, King Mongkut's University of Technology Thonburi, 126 Prachauthit Rd., Bangmod, Thungkru, Bangkok, 10140, Thailand.
| | - Surawut Chuangchote
- The Joint Graduate School of Energy and Environment, King Mongkut's University of Technology Thonburi, 126 Prachauthit Rd., Bangmod, Thungkru, Bangkok, 10140, Thailand
- Centre of Excellence on Energy Technology and Environment, Science and Technology Postgraduate Education and Research Development Office, Bangkok, Thailand
| | - Takashi Sagawa
- Department of Fundamental Energy Science, Graduate School of Energy Science, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto, 606-8501, Japan
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Xia D, Lo IMC. Synthesis of magnetically separable Bi2O4/Fe3O4 hybrid nanocomposites with enhanced photocatalytic removal of ibuprofen under visible light irradiation. Water Res 2016; 100:393-404. [PMID: 27219049 DOI: 10.1016/j.watres.2016.05.026] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [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: 12/04/2015] [Revised: 04/13/2016] [Accepted: 05/02/2016] [Indexed: 06/05/2023]
Abstract
Ibuprofen (IBU) is one of the representative persistent organic pollutants (POPs) which can cause severe adverse effects in humans and wildlife. Therefore, effectively removing IBU from water is a worldwide necessity. In this study, a novel superparamagnetic Bi2O4/Fe3O4 nanocomposite was successfully prepared by an in-situ growth method and utilized for photocatalytic removal of IBU. The structural characterization of the Bi2O4/Fe3O4 nanocomposite indicates that the monodisperse Fe3O4 nanoparticles of diameter 10 nm are highly assembled on the Bi2O4 nanorods of diameter 120 nm. Under visible light irradiation, using an optimum molar ratio of Bi2O4/Fe3O4 (1:2.5) resulted in a complete photocatalytic degradation of IBU within 2 h, which is a 1.7 times higher efficiency than pure Bi2O4, and a complete mineralization of IBU with a prolonged irradiation time of 4 h. In addition, the potential practicality of Bi2O4/Fe3O4 (1:2.5) was also demonstrated by the efficient photocatalytic degradation of IBU in actual drinking water. The photocatalytic mechanisms of Bi2O4/Fe3O4 (1:2.5) were revealed, indicating that the enhanced photocatalytic performance was mainly attributed to the accelerated separation of electron-hole pairs after surface modification of Fe3O4, and that the photogenerated h(+) was the primary reactive species for the photocatalytic removal of IBU. Furthermore, the Bi2O4/Fe3O4 (1:2.5) can be magnetically recycled and shows good reusability without significant loss of photocatalytic activity or structural change even after reuse over five cycles, showing a promising application for the photocatalytic degradation of POPs from water.
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Affiliation(s)
- Dehua Xia
- Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
| | - Irene M C Lo
- Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China.
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Tang L, Wang J, Zeng G, Liu Y, Deng Y, Zhou Y, Tang J, Wang J, Guo Z. Enhanced photocatalytic degradation of norfloxacin in aqueous Bi2WO6 dispersions containing nonionic surfactant under visible light irradiation. J Hazard Mater 2016; 306:295-304. [PMID: 26774984 DOI: 10.1016/j.jhazmat.2015.12.044] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [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: 09/28/2015] [Revised: 12/02/2015] [Accepted: 12/22/2015] [Indexed: 05/15/2023]
Abstract
Photocatalytic degradation is an alternative method to remove pharmaceutical compounds in water, however it is hard to achieve efficient rate because of the poor solubility of pharmaceutical compounds in water. This study investigated the photodegradation of norfloxacin in a nonionic surfactant Triton-X100 (TX100)/Bi2WO6 dispersion under visible light irradiation (400-750nm). It was found that the degradation of poorly soluble NOF can be strongly enhanced with the addition of TX100. TX100 was adsorbed strongly on Bi2WO6 surface and accelerated NOF photodegradation at the critical micelle concentration (CMC=0.25mM). Higher TX100 concentration (>0.25mM) lowered the degradation rate. In the presence of TX100, the degradation rate reached the maximum value when the pH value was 8.06. FTIR analyses demonstrated that the adsorbed NOF on the catalyst was completely degraded after 2h irradiation. According to the intermediates identified by HPLC/MS/MS, three possible degradation pathways were proposed to include addition of hydroxyl radical to quinolone ring, elimination of piperazynilic ring in fluoroquinolone molecules, and replacement of F atoms on the aromatic ring by hydroxyl radicals.
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Affiliation(s)
- Lin Tang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
| | - Jiajia Wang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental 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 Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
| | - Yani Liu
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Yaocheng Deng
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Yaoyu Zhou
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Jing Tang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Jingjing Wang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Zhi Guo
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
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Li G, Nie X, Chen J, Jiang Q, An T, Wong PK, Zhang H, Zhao H, Yamashita H. Enhanced visible-light-driven photocatalytic inactivation of Escherichia coli using g-C3N4/TiO2 hybrid photocatalyst synthesized using a hydrothermal-calcination approach. Water Res 2015; 86:17-24. [PMID: 26084941 DOI: 10.1016/j.watres.2015.05.053] [Citation(s) in RCA: 147] [Impact Index Per Article: 16.3] [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: 02/05/2015] [Revised: 05/22/2015] [Accepted: 05/27/2015] [Indexed: 05/21/2023]
Abstract
Biohazards are widely present in wastewater, and contaminated water can arouse various waterborne diseases. Therefore, effectively removing biohazards from water is a worldwide need. In this study, a novel visible-light-driven (VLD) graphitic carbon nitride (g-C3N4)/TiO2 hybrid photocatalyst with high photocatalytic bacterial inactivation activity was successfully synthesized using a facile hydrothermal-calcination approach. The optimum synthesized hybrid photocatalyst is composed of micron-sized TiO2 spheres (average diameter: ca. 2 μm) and wrapped with lamellar g-C3N4 (thickness: ca. 2 nm), with narrowing bandgap (ca. 2.48 eV), leading to a significant improvement of visible light (VL) absorption and effective separation of photo-generated electron-hole pairs. This greatly enhances VL photocatalytic inactivation activity towards bacteria in water. Using this hybrid photocatalyst, 10(7) cfu mL(-1) of Escherichia coli K-12 could be completely inactivated within 180 min under VL irradiation. SEM images indicate that bacterial cells were greatly damaged, leading to a severe leakage of intracellular components during photocatalytic inactivation processes. The study concludes that bacterial cell destruction and water disinfection can be achieved using this newly fabricated VLD hybrid photocatalyst.
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Affiliation(s)
- Guiying Li
- State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
| | - Xin Nie
- State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jiangyao Chen
- State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
| | - Qi Jiang
- State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Taicheng An
- State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
| | - Po Keung Wong
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, NT, Hong Kong SAR, China
| | - Haimin Zhang
- Centre for Clean Environment and Energy, Griffith University, Gold Coast Campus, QLD, 4222, Australia
| | - Huijun Zhao
- Centre for Clean Environment and Energy, Griffith University, Gold Coast Campus, QLD, 4222, Australia
| | - Hiromi Yamashita
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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Liu W, Liu H, Ai Z. In-situ generated H₂O₂ induced efficient visible light photo-electrochemical catalytic oxidation of PCP-Na with TiO₂. J Hazard Mater 2015; 288:97-103. [PMID: 25698570 DOI: 10.1016/j.jhazmat.2015.02.024] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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: 10/05/2014] [Revised: 01/24/2015] [Accepted: 02/08/2015] [Indexed: 06/04/2023]
Abstract
In this study, we developed a novel photo-electrochemical catalytic oxidation wastewater treatment system by interacting the cathodic in-situ generated H₂O₂ with TiO₂ suspension to form interfacial ≡ Ti(IV)OOH species, which endowed the PEC system with superior efficiency for degrading sodium pentachlorophenate (PCP-Na) under visible light irradiation at neutral pH. The apparent PCP-Na degradation rate constant of the PEC system was more than 10 times that of the electrochemical oxidation counterpart. In the PEC system, the interfacial ≡ Ti(IV)OOH species injected electrons to the conduction band of TiO₂ to initiate the activation of O₂ and the in-situ generated H₂O₂ adsorbed on the surface of TiO₂, lead to producing reactive oxygen species of superoxide anions and hydroxyl radicals, which were responsible for the dechlorination and mineralization of PCP-Na during the PEC process, respectively. The dosage of TiO₂ catalyst and the current intensity applied on PCP-Na degradation were optimized. This study develops a high efficient PEC oxidation system for wastewater treatment and provides new insight into the role of cathodic in-situ generated H₂O₂ on PEC oxidation of PCP-Na with TiO₂ under visible light irradiation.
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Affiliation(s)
- Wei Liu
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Huichao Liu
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Zhihui Ai
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China.
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Cui Y, Luan J. Synthesis, crystal structure, photodegradation kinetics and photocatalytic activity of novel photocatalyst ZnBiYO4. J Environ Sci (China) 2015; 29:51-61. [PMID: 25766013 DOI: 10.1016/j.jes.2014.06.051] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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: 04/09/2014] [Revised: 06/13/2014] [Accepted: 06/17/2014] [Indexed: 06/04/2023]
Abstract
ZnBiYO4 was synthesized by a solid-state reaction method for the first time. The structural and photocatalytic properties of ZnBiYO4 were characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and UV-Vis diffuse reflectance. ZnBiYO4 crystallized with a tetragonal spinel structure with space group I41/A. The lattice parameters for ZnBiYO4 were a=b=11.176479Å and c=10.014323Å. The band gap of ZnBiYO4 was estimated to be 1.58eV. The photocatalytic activity of ZnBiYO4 was assessed by photodegradation of methyl orange under visible light irradiation. The results showed that ZnBiYO4 had higher catalytic activity compared with N-doped TiO2 under the same experimental conditions using visible light irradiation. The photocatalytic degradation of methyl orange with ZnBiYO4 or N-doped TiO2 as catalyst followed first-order reaction kinetics, and the first-order rate constant was 0.01575 and 0.00416 min(-1) for ZnBiYO4 and N-doped TiO2, respectively. After visible light irradiation for 220 min with ZnBiYO4 as catalyst, complete removal and mineralization of methyl orange were observed. The reduction of total organic carbon, formation of inorganic products, SO4(2-) and NO3-, and evolution of CO2 revealed the continuous mineralization of methyl orange during the photocatalytic process. The intermediate products were identified using liquid chromatography-mass spectrometry. The ZnBiYO4/(visible light) photocatalysis system was found to be suitable for textile industry wastewater treatment and could be used to solve other environmental chemical pollution problems.
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Affiliation(s)
- Yanbing Cui
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China. E-mail: .
| | - Jingfei Luan
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China. E-mail: .
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Ding S, Niu J, Bao Y, Hu L. Evidence of superoxide radical contribution to demineralization of sulfamethoxazole by visible-light-driven Bi2O3/Bi2O2CO3/Sr6Bi2O9 photocatalyst. J Hazard Mater 2013; 262:812-818. [PMID: 24140532 DOI: 10.1016/j.jhazmat.2013.09.048] [Citation(s) in RCA: 16] [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: 06/13/2013] [Revised: 09/19/2013] [Accepted: 09/20/2013] [Indexed: 06/02/2023]
Abstract
Photocatalytic degradation of sulfamethoxazole (SMX) was investigated using Bi2O3/Bi2O2CO3/Sr6Bi2O9 (BSO) photocatalyst under visible light (>420 nm) irradiation. The photochemical degradation of SMX followed pseudo-first-order kinetics. The reaction kinetics was determined as a function of initial SMX concentrations (5-20 mg L(-1)), initial pH (3-11) and BSO concentrations (6-600 mg L(-1)). Approximately, 90% of SMX (10 mg L(-1)) degradation and 36% of TOC reduction were achieved at pH 7.0 after 120 min irradiation. The main mineralization products, including NH4(+), NO3(-), SO4(2-) and CO2, as well as intermediates 3-amino-5-methylisoxazole (AMI), p-benzoquinone (BZQ), and sulfanilic acid (SNA) were detected in aqueous solution. The formation of O2(*-) radical was evidenced by using electron spin resonance and a chemiluminescent probe, luminal. A possible degradation mechanism involving excitation of BSO, followed by charge injection into the BSO conduction band and formation of reactive superoxide radical (O2(*-)) was proposed for the mineralization of SMX. During the reaction, the O2(*-) radical attacks the sulfone moiety and causes the cleavage of the SN bond, which leads to the formation of two sub-structure analogs, AMI and SNA.
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Affiliation(s)
- Shiyuan Ding
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China
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