1
|
Sahoo S, Mahamallik P, Das R, Panigrahi S. A critical review on non-metal doped g-C 3N 4 based photocatalyst for organic pollutant remediation with sustainability assessment by life cycle analysis. ENVIRONMENTAL RESEARCH 2024; 258:119390. [PMID: 38879105 DOI: 10.1016/j.envres.2024.119390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2024] [Revised: 05/14/2024] [Accepted: 06/07/2024] [Indexed: 06/22/2024]
Abstract
Photocatalysis is recognized to be one of the most promising ways to address energy and environmental issues by utilizing visible light. Graphitic carbon nitride (g-C3N4), with a moderate band gap (∼2.7 eV) has been the flashpoint in environmental photocatalysis as it can work better under visible light, can be synthesized by a facile synthesis process using low-cost materials, thermally and chemically stable. Still the photocatalytic performance of g-C3N4 is not satisfactory because of certain limitations such as insufficient visible light absorption capacity, low electron-hole separation efficiency, high recombination rate, poor surface area. Introduction of doping, band structure engineering, defecting and designing of heterojunction, composites etc. were investigated to amplify its applications. Among all these modifications, elemental doping is a suitable and successful alternative for the enhancement of the photocatalytic activity by changing the optical and electronic properties. This review emphasizes on advancement and trends of elemental doping and its application on photocatalytic organic pollutant remediation in aqueous medium. The fundamental photocatalytic activity of heterogeneous photocatalysis and specifically g-C3N4-based photocatalysis have been discussed. The benfits of non-metal doping, enhanced photocatalytic performance by doping element, mechanism invloved in doping, advantages of co-doping has been explained. Mono, bi, and tri non-metal doped g-C3N4 and their application for the removal of organic pollutants from water medium by visible light photocatalysis has been summerized. Life cycle assessment (LCA) of photocatalytic system has been highlighted. Future research should focus on the large-scale application of the photocatalysis process considering the economic aspects. A rigorous life cycle assessment for deploying the non-metal doped g-C3N4-based photocatalysis technology for successful commercial application is recommended.
Collapse
Affiliation(s)
- Subhalaxmi Sahoo
- Water and Wastewater Research Laboratory, Department of Civil Engineering, National Institute of Technology (NIT), Rourkela, 769008, Odisha, India
| | - Prateeksha Mahamallik
- Water and Wastewater Research Laboratory, Department of Civil Engineering, National Institute of Technology (NIT), Rourkela, 769008, Odisha, India.
| | - Rahul Das
- Department of Civil Engineering, National Institute of Technology (NIT), 799046, Agartala, India
| | - Sagarika Panigrahi
- Department of Civil Engineering, National Institute of Technology (NIT), 799046, Agartala, India
| |
Collapse
|
2
|
Wang S, Tuo B, Wang J, Mo Y. Research progress of TiO 2-based photocatalytic degradation of wastewater: bibliometric analysis. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:125417-125438. [PMID: 38015394 DOI: 10.1007/s11356-023-31236-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Accepted: 11/21/2023] [Indexed: 11/29/2023]
Abstract
The pollution caused by modernization and industrialization has caused serious harm to the biodiversity of the earth. TiO2-based photocatalyst has been widely studied as an effective and sustainable water environment remediation material. In this study, we analyzed the status and research trends of TiO2-based photocatalytic degradation of wastewater in depression from 2003 to 2023 to provide a reference for further research. "Doping", "Modification" and "Heterojunction" were used as keywords, and 817 related academic literatures were screened out by using Web of Science database. Through the visualization software VOSviewer and CiteSpace, the authors, institutions and literature keywords were clustered. The results show that since 2008, the annual number of published papers on TiO2-based photocatalytic degradation of wastewater has increased from 9 to 114. Among them, China has published 432 articles and made great contributions, and there are many representative research teams. Chinese universities are the main body to study TiO2-based photocatalytic degradation of wastewater, but the cooperation between universities is not as close as that abroad. This paper comprehensively analyzes the research hotspots of TiO2-based photocatalytic degradation of wastewater, such as the doping of TiO2 and the construction of different types of heterojunctions of TiO2. It is expected that these analysis results will provide new research ideas for researchers to carry out future research on related topics and let researchers know in-depth research institutions and possible collaborators to conduct academic exchanges and discussions with active institutions.
Collapse
Affiliation(s)
- Shengqing Wang
- College of Mining, Guizhou University, Guiyang, 550025, People's Republic of China
| | - Biyang Tuo
- College of Mining, Guizhou University, Guiyang, 550025, People's Republic of China.
- National and Local Joint Laboratory for Effective Utilization of Mineral Resources in Karst Area, Guiyang, 550025, People's Republic of China.
| | - Jianli Wang
- College of Metallurgy and Material Engineering, Hunan University of Technology, Zhuzhou, 412000, People's Republic of China
| | - Yuying Mo
- College of Mining, Guizhou University, Guiyang, 550025, People's Republic of China
| |
Collapse
|
3
|
Khodabandeloo F, Sheydaei M, Moharramkhani P, Masteri-Farahani M, Khataee A. Preparation of Fe 2(MoO 4) 3/graphene/Ti nanocomposite electrode for visible-light photoelectrocatalytic degradation of organic pollutants. CHEMOSPHERE 2023; 330:138766. [PMID: 37100250 DOI: 10.1016/j.chemosphere.2023.138766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Revised: 03/25/2023] [Accepted: 04/21/2023] [Indexed: 05/14/2023]
Abstract
The massive emission of organic pollutants, specially organic dyes into water poses a serious threat to the environment and human health. Photoelectrocatalysis (PEC) has been regarded as an efficient, promising and green technology for organic pollution degradation and mineralization. Herein, Fe2(MoO4)3/graphene/Ti nanocomposite was synthesized and applied as a superior photoanode in a visible-light PEC process for degradation and mineralization of an organic pollutant. First, the Fe2(MoO4)3 was synthesized by the microemulsion-mediated method. Then, Fe2(MoO4)3 and graphene particles were simultaneously immobilized on a titanium plate by the electrodeposition technique. The prepared electrode was characterized by XRD, DRS, FTIR and FESEM analyses. The ability of the nanocomposite was investigated in the Reactive Orange 29 (RO29) pollutant degradation by the PEC. The Taguchi method was used for the visible-light PEC experiments design. The efficiency of RO29 degradation was enhanced with increasing bias potential, number of Fe2(MoO4)3/graphene/Ti electrodes, visible-light power and Na2SO4 (electrolyte) concentration. The pH of the solution was the most influential variable in the visible-light PEC process. Furthermore, the performance of the visible-light PEC was compared with photolysis, sorption, visible-light photocatalysis and electrosorption processes. The obtained results confirm the synergistic effect of these processes on RO29 degradation by the visible-light PEC.
Collapse
Affiliation(s)
- Farhad Khodabandeloo
- Department of Applied Chemistry, Faculty of Chemistry, Kharazmi University, 15719-14911, Tehran, Iran
| | - Mohsen Sheydaei
- Department of Applied Chemistry, Faculty of Chemistry, Kharazmi University, 15719-14911, Tehran, Iran.
| | - Parisa Moharramkhani
- Department of Applied Chemistry, Faculty of Chemistry, Kharazmi University, 15719-14911, Tehran, Iran
| | - Majid Masteri-Farahani
- Department of Inorganic Chemistry, Faculty of Chemistry, Kharazmi University, 15719-14911, Tehran, Iran
| | - Alireza Khataee
- Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471, Tabriz, Iran; Department of Environmental Engineering, Gebze Technical University, 41400, Gebze, Turkey.
| |
Collapse
|
4
|
Kışla D, Gökmen GG, Akdemir Evrendilek G, Akan T, Vlčko T, Kulawik P, Režek Jambrak A, Ozogul F. Recent developments in antimicrobial surface coatings: Various deposition techniques with nanosized particles, their application and environmental concerns. Trends Food Sci Technol 2023. [DOI: 10.1016/j.tifs.2023.03.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
|
5
|
Bimetallic TiO 2 Nanoparticles for Lignin-Based Model Compounds Valorization by Integrating an Optocatalytic Flow-Microreactor. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27248731. [PMID: 36557862 PMCID: PMC9785458 DOI: 10.3390/molecules27248731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 12/01/2022] [Accepted: 12/06/2022] [Indexed: 12/13/2022]
Abstract
The challenge of improving the activity of TiO2 by modifying it with metals and using it for targeted applications in microreactor environments is an active area of research. Recently, microreactors have emerged as successful candidates for many photocatalytic reactions, especially for the selective oxidation process. The current work introduces ultrasound-assisted catalyst deposition on the inner walls of a perfluoro-alkoxy alkane (PFA) microtube under mild conditions. We report Cu-Au/TiO2 and Fe-Au/TiO2 nanoparticles synthesized using the sol-gel method. The obtained photocatalysts were thoroughly characterized by UV-Vis diffuse-reflectance spectroscopy (DRS), high-resolution scanning electron microscopy (HR-SEM), high-resolution transmission electron microscopy (HR-TEM), X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and N2 physisorption. The photocatalytic activity under UV (375 nm) and visible light (515 nm) was estimated by the oxidation of lignin-based model aromatic alcohols in batch and fluoropolymer-based flow systems. The bimetallic catalyst exhibited improved photocatalytic selective oxidation. Herein, four aromatic alcohols were individually investigated and compared. In our experiments, the alcohols containing hydroxy and methoxy groups (coniferyl and vanillin alcohol) showed high conversion (93% and 52%, respectively) with 8% and 17% selectivity towards their respective aldehydes, with the formation of other side products. The results offer an insight into ligand-to-metal charge transfer (LMCT) complex formation, which was found to be the main reason for the activity of synthesized catalysts under visible light.
Collapse
|
6
|
S-Scheme BaTiO3/TiO2 heterojunctions: Piezophotocatalytic degradation of norfloxacin. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
7
|
Structural, Optical and Photocatalytic Properties of Mn Doped ZnO Nanoparticles Used as Photocatalysts for Azo-Dye Degradation under Visible Light. Catalysts 2022. [DOI: 10.3390/catal12111382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Doping ZnO with appropriate foreign metal and/or non-metal ions is one of the most promising ways to improve both the extension of ZnO photosensitization to the visible region and the separation of charge carriers. Herein, Mn-doped ZnO nanoparticles were synthesized using a precipitation method. The effect of the Mn amount on the physico-chemical properties of these nanomaterials was investigated using X-ray diffraction, Fourier-transform infrared spectroscopy, UV–visible diffuse reflectance spectroscopy, photoluminescence spectroscopy and scanning electron microscopy coupled with energy dispersive X-ray spectroscopy. The photocatalytic properties of the synthesized nanomaterials were assessed through methyl orange (MO) under visible light. The obtained results showed that the structural and optical properties of the synthesized Mn-ZnO nanomaterials depended greatly on the Mn amount. It was found that the substitution of Zn2+ by Mn2+/Mn3+ within the lattice of ZnO occurred. The photocatalytic experiments revealed that the sample containing 10 wt% exhibited the best MO conversion. For this sample, the discoloration reached 96%, while the chemical oxygen demand reached 1% after 820 min of visible illumination. The enhanced photocatalytic activity was attributed to the efficient separation of charge carriers. The active species quenching experiments showed that the holes are the main active species in MO degradation under visible light in the presence of 10%Mn-ZnO.
Collapse
|
8
|
Awoke YA, Tsai MC, Adam DB, Ayele AA, Yang SC, Huang WH, Chen JL, Pao CW, Mou CY, Su WN, Hwang BJ. The synergistic effect Pt1-W dual sites as a highly active and durable catalyst for electrochemical methanol oxidation. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
9
|
Pradhan SR, Lisovytskiy D, Colmenares JC. Flow photomicroreactor coated with monometal containing TiO2 using sonication: A versatile tool for visible light oxidation. CATAL COMMUN 2022. [DOI: 10.1016/j.catcom.2021.106375] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
|
10
|
Sol–gel reaction of titanium phosphonate alkoxide cluster. Appl Organomet Chem 2022. [DOI: 10.1002/aoc.6615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
11
|
Aadnan I, Zegaoui O, El Mragui A, Esteves da Silva JCG. Physicochemical and Photocatalytic Properties under Visible Light of ZnO-Bentonite/Chitosan Hybrid-Biocompositefor Water Remediation. NANOMATERIALS 2021; 12:nano12010102. [PMID: 35010050 PMCID: PMC8746606 DOI: 10.3390/nano12010102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Revised: 12/27/2021] [Accepted: 12/27/2021] [Indexed: 11/16/2022]
Abstract
In this investigation, a hybrid-biocomposite "ZnO-Bentonite/Chitosan" was synthesized using inexpensive and environmentally friendly materials (Bentonitechitosan) and (ZnO). It was used as a photocatalyst for water remediation. The structural, optical, thermal, and morphological properties of the synthesized hybrid-biocomposite were investigated using XRD, FTIR spectroscopy, UV-vis diffuse reflectance spectroscopy, TGA, XPS, and SEM-EDS. The thermal measurements showed that the decomposition of CS was postponed progressively by adding PB and ZnO, and the thermal stability of the synthesized hybrid-biocomposite was improved. The characterization results highlighted strong interactions between the C-O, C=O, -NH2, and OH groups of chitosan and the alumina-silica sheets of bentonite on the one side, and between the functional groups of chitosan (-NH2, OH) and ZnO on the other side. The photocatalytic efficiency of the prepared hybrid-biocomposite was assessed in the presence of Methyl Orange (MO). The experiments carried out in the dark showed that the MO removal increased in the presence of Zn-PB/CS hybrid-biocomposite (86.1%) by comparison with PB (75.8%) and CS (65.4%) materials. The photocatalytic experiments carried out under visible light showed that the MO removal increased 268 times in the presence of Zn-PB/CS by comparison withZnO.The holes trapping experiments indicated that they are the main oxidative active species involved in the MO degradation under both UV-A and visible light irradiations.
Collapse
Affiliation(s)
- Imane Aadnan
- Research Team “Materials and Applied Catalysis: MCA”, CBAE Laboratory, URL-CNRST N°13, Faculty of Sciences, Moulay Ismail University of Meknes, P.O. Box 11201 Zitoune, Meknès 50700, Morocco; (I.A.); (A.E.M.)
| | - Omar Zegaoui
- Research Team “Materials and Applied Catalysis: MCA”, CBAE Laboratory, URL-CNRST N°13, Faculty of Sciences, Moulay Ismail University of Meknes, P.O. Box 11201 Zitoune, Meknès 50700, Morocco; (I.A.); (A.E.M.)
- Correspondence:
| | - Abderrahim El Mragui
- Research Team “Materials and Applied Catalysis: MCA”, CBAE Laboratory, URL-CNRST N°13, Faculty of Sciences, Moulay Ismail University of Meknes, P.O. Box 11201 Zitoune, Meknès 50700, Morocco; (I.A.); (A.E.M.)
| | | |
Collapse
|
12
|
Fe-TiO2/AC and Co-TiO2/AC Composites: Novel Photocatalysts Prepared from Waste Streams for the Efficient Removal and Photocatalytic Degradation of Cibacron Yellow F-4G Dye. Catalysts 2021. [DOI: 10.3390/catal11101137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Fe-TiO2/AC and Co-TiO2/AC composites were prepared from activated carbon (AC) derived from residues of peanut hulls and TiO2 photocatalyst, electrochemically prepared from titanium scrap, and doped with Fe and Co, respectively. The adsorption capacity and photocatalytic activity of the Fe-TiO2/AC and Co-TiO2/AC composites were studied for removing and degrading Cibacron Yellow F-4G (CYF-4G) from wastewater. Doped ACs were characterized by thermogravimetry (TGA), scanning electron microscopy (SEM), X-ray diffraction (XRD), a new X-ray absorption technique (XRA), and elemental analysis (EA). Interesting relationships were found between SEM, XRA, and TGA data and the doped amount of catalyst on ACs. Optimal dye adsorption was found at a pH of 2.0. The CYF-4G adsorption kinetics are followed according to the pseudo-second order model. The experimental data revealed that the Langmuir model fits better than the Freundlich and Temkin models. A decrease in adsorption capacity was observed when the catalyst dope percentage increased. A removal and degradation efficiency of the dye close to 100% was achieved around 120 min. A synergistic adsorption and photocatalytic degradation effect of the Fe-TiO2/AC and Co-TiO2/AC composites could be observed when adsorption experiments were conducted under simulated visible radiation.
Collapse
|
13
|
Gadore V, Ahmaruzzaman M. Fly ash-based nanocomposites: a potential material for effective photocatalytic degradation/elimination of emerging organic pollutants from aqueous stream. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:46910-46933. [PMID: 34263399 DOI: 10.1007/s11356-021-15251-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Accepted: 06/28/2021] [Indexed: 06/13/2023]
Abstract
Fly ash is readily available and cheaply generated as 47a by-product of the combustion of organic matter. A tremendous amount of fly ash is generated worldwide, and its disposal has imposed 47a severe environmental concern. Its good adsorption capacities attracted several researchers to study the use of fly ash as 47a support for photocatalysts for the degradation of contaminants from wastewater. Undoubtedly the photocatalysts supported on fly ash have represented excellent degradation efficiencies due to the synergistic effect of adsorption and photocatalytic capacity. The utilization of fly ash as 47a precursor has solved the problem of disposal and added value to the waste by-product. Various preparation techniques for fly ash-based nanocomposites such as the sol-gel method, hydrothermal method, solvothermal method, precipitation and co-precipitation, modified metalorganic decomposition, electrospinning, incipient impregnation, and wet chemical synthesis, along with 47a brief study of their characterization using scanning electron microscopy, X-ray diffraction technique and Fourier transform infrared (FTIR) spectroscopy, and the mechanism of photodegradation of dyes have been discussed in this paper. The literature shows that SiO2, TiO2, and Al2O3 present in fly ash play an essential role in the photodegradation of dyes. Factors affecting the degradation of dyes, their kinetic studies, and methods to enhance photodegradation efficiency have also been discussed.
Collapse
Affiliation(s)
- Vishal Gadore
- Department of Chemistry, National Institute of Technology, Silchar, Assam, 788010, India
| | - Md Ahmaruzzaman
- Department of Chemistry, National Institute of Technology, Silchar, Assam, 788010, India.
| |
Collapse
|
14
|
Advanced Oxidation Processes Coupled with Nanomaterials for Water Treatment. NANOMATERIALS 2021; 11:nano11082045. [PMID: 34443876 PMCID: PMC8400743 DOI: 10.3390/nano11082045] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Revised: 08/09/2021] [Accepted: 08/10/2021] [Indexed: 02/04/2023]
Abstract
Water quality management will be a priority issue in the near future. Indeed, due to scarcity and/or contamination of the water, regulatory frameworks will be increasingly strict to reduce environmental impacts of wastewater and to allow water to be reused. Moreover, drinking water quality standards must be improved in order to account for the emerging pollutants that are being detected in tap water. These tasks can only be achieved if new improved and sustainable water treatment technologies are developed. Nanomaterials are improving the ongoing research on advanced oxidation processes (AOPs). This work reviews the most important AOPs, namely: persulfate, chlorine and NH2Cl based processes, UV/H2O2, Fenton processes, ozone, and heterogeneous photocatalytic processes. A critical review of the current coupling of nanomaterials to some of these AOPs is presented. Besides the active role of the nanomaterials in the degradation of water contaminants/pollutants in the AOPs, the relevance of their adsorbent/absorbent function in these processes is also discussed.
Collapse
|
15
|
El Mragui A, Zegaoui O, Esteves da Silva JCG. Elucidation of the photocatalytic degradation mechanism of an azo dye under visible light in the presence of cobalt doped TiO 2 nanomaterials. CHEMOSPHERE 2021; 266:128931. [PMID: 33243579 DOI: 10.1016/j.chemosphere.2020.128931] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 10/27/2020] [Accepted: 11/08/2020] [Indexed: 06/11/2023]
Abstract
In this study, Co-TiO2 nanoparticles were successfully synthesized using sol-gel and precipitation methods. The effect of Co amount on the physicochemical properties of these nanomaterials was investigated using various techniques. The obtained results showed that the structural and optical properties of the synthesized Co-TiO2 nanomaterials depended closely on the weight percent of Co added to TiO2. It was found that, for 1%Co-TiO2, a substitution of Ti4+ and Co2+/Co3+ within the lattice of TiO2 was happened. The results of the photocatalytic degradation of methyl orange (MO) experiments carried out in the presence of the as prepared nanomaterials showed that under visible light, the sample 1%Co-TiO2 exhibited the best MO conversion. The enhanced photocatalytic activity has been attributed to the efficient charge separation of electrons and holes. The mechanistic studies revealed that O2-, h+ and OH are the major active species, and a possible mechanism degradation pathway of MO dye is proposed.
Collapse
Affiliation(s)
- Abderrahim El Mragui
- Research Team "Materials and Applied Catalysis: MCA", CBAE Laboratory, Moulay Ismail University, Faculty of Sciences, BP.11201 Zitoune, Meknès, Morocco
| | - Omar Zegaoui
- Research Team "Materials and Applied Catalysis: MCA", CBAE Laboratory, Moulay Ismail University, Faculty of Sciences, BP.11201 Zitoune, Meknès, Morocco.
| | - Joaquim C G Esteves da Silva
- CIQ(UP) - Research Center in Chemistry, DGAOT, Faculty of Sciences, University of Porto, Rua do Campo Alegre, s/n, 4169-007, Porto, Portugal
| |
Collapse
|
16
|
Wang Y, Wang J, Lian W, Liu Y. Insight into the enhanced photocatalytic activity of Mo and P codoped SrTiO 3 from first-principles prediction. RSC Adv 2020; 10:40117-40126. [PMID: 35520856 PMCID: PMC9058650 DOI: 10.1039/d0ra07026b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2020] [Accepted: 10/19/2020] [Indexed: 11/21/2022] Open
Abstract
In this study, the synergistic effect of cation codoping (Mo and the cation P) on the band structure of SrTiO3 is demonstrated to enhance its photocatalytic activity. The electronic structure and optical properties of (Mo + P) codoped SrTiO3 are examined by performing GGA + U calculations. The results show that the strong hybridization between the Mo 4d states and the O 2p states assisted by the non-metal P leads to the formation of fully occupied and delocalized intermediate states (IBs) near the valence band of SrTiO3. The proximity of IBs to the valence band resulted in the ability to separate photo-excited electrons from reaction holes, which helps to ensure efficient electron replenishment reducing the probability of trapping electrons from the CB. This kind of metal Mo and non-metal P-compensated codoping can efficiently narrow the band gap and enhance the visible-light absorption. Moreover, the positions of the band edges after codoping (Mo + P) are found to be thermodynamically favorable for water splitting.
Collapse
Affiliation(s)
- Yueqin Wang
- School of Mechanics and Optoelectronic Physics, Anhui University of Science and Technology Huainan 232001 China
| | - Jingyu Wang
- School of Materials Science and Engineering, Anhui University of Science and Technology Huainan 232001 China
| | - Wei Lian
- School of Materials Science and Engineering, Anhui University of Science and Technology Huainan 232001 China
| | - Yin Liu
- School of Materials Science and Engineering, Anhui University of Science and Technology Huainan 232001 China
| |
Collapse
|
17
|
Ge X, Fu W, Wang Y, Wang L, Yao F. Removal of nitrate nitrogen from water by phosphotungstate-supported TiO 2 photocatalytic method. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:40475-40482. [PMID: 32666458 DOI: 10.1007/s11356-020-09947-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 06/29/2020] [Indexed: 06/11/2023]
Abstract
Nitrate nitrogen in water, especially in groundwater, is a major problem in the current drinking water environment. In this study, copper- and nickel-modified phosphotungstate catalysts supported on TiO2 were prepared by the sol-gel solvothermal method, and photocatalytic reduction by phosphotungstate was used to remove nitrate nitrogen in water under ultraviolet irradiation. The maximum removal rate was 59.60% with 0.8 g/L Cu-H3PW12O40/TiO2, 90 mg/L nitrate nitrogen, and 60 min reaction time. For Ni-H3PW12O40/TiO2, the maximum removal rate of nitrate nitrogen was 54.58%, achieved with a catalyst concentration of 0.8 g/L, nitrate nitrogen concentration of 120 mg/L, and reaction time of 30 min. Both catalysts could remove nitrate nitrogen from water under the condition of photocatalysis.
Collapse
Affiliation(s)
- Xiaohong Ge
- College of Resources and Environment, Shandong Agricultural University, Tai'an, 271018, People's Republic of China
- College of Ecology and Environmental Protection, Linyi Vocational University of Science and Technology, Linyi, 276000, People's Republic of China
| | - Weizhang Fu
- College of Resources and Environment, Shandong Agricultural University, Tai'an, 271018, People's Republic of China.
| | - Yujun Wang
- College of Resources and Environment, Shandong Agricultural University, Tai'an, 271018, People's Republic of China.
| | - Lingsheng Wang
- College of Resources and Environment, Shandong Agricultural University, Tai'an, 271018, People's Republic of China
| | - Fanfeng Yao
- College of Resources and Environment, Shandong Agricultural University, Tai'an, 271018, People's Republic of China
| |
Collapse
|
18
|
Shao Z, Zhang Y, Yang X, Zhong M. Au-Mediated Charge Transfer Process of Ternary Cu 2O/Au/TiO 2-NAs Nanoheterostructures for Improved Photoelectrochemical Performance. ACS OMEGA 2020; 5:7503-7518. [PMID: 32280894 PMCID: PMC7144151 DOI: 10.1021/acsomega.0c00299] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Accepted: 03/18/2020] [Indexed: 05/05/2023]
Abstract
Based on a facile three-step preparation method, Cu2O/Au/TiO2-NAs ternary heterojunction nanocomposites have been successfully synthesized by electrodepositing a Cu2O layer on the surface of Au nanoparticles (NPs) decorated highly ordered TiO2 nanotube arrays (NAs). The structure, surface morphology, chemical composition, and optical and intrinsic defects properties of the as-prepared samples are characterized by transmission and scanning electron microscopy (TEM and SEM), X-ray diffraction (XRD), UV-vis light absorbance spectra, Raman scattering, and X-ray photoelectron spectroscopy (XPS). Simultaneously, the Cu2O/Au/TiO2-NAs ternary nanohybrids exhibited progressively improved photoelectrocatalytic (PEC) performance compared with the dual Cu2O/TiO2-NAs type-II nanoheterojunctions, confirming by the photocurrent density versus testing time curve (amperometric I-t curve), open-circuit potential versus testing time curve (V oc-t curve), and electrochemical impedance spectroscopy (EIS) measurements, which were mainly ascribed to the synergistic effect of reduced interfacial charge transfer resistance and boosted energetic charge carriers generation associated with embedding Au NPs. Furthermore, the self-consistent charge transfer mechanism of Z-scheme and interband transitions mediated with Au NPs for Cu2O/Au/TiO2-NAs triple nanocomposites is proposed, which was evaluated by nanosecond time-resolved transient photoluminescence (NTRT-PL) spectra excited by 266 and 400 nm, respectively. Following this scheme, UV-vis light photocatalytic activities of Cu2O/Au/TiO2-NAs ternary nanohybrids were elaborated toward photodegradation of methyl orange (MO) in aqueous solution, and the photodegradation rate of optimum triple nanocomplex was found to be 90%.
Collapse
Affiliation(s)
- Zhufeng Shao
- College of New Energy, Bohai University, Jinzhou, Liaoning, 121000 China
| | - Yufeng Zhang
- College of New Energy, Bohai University, Jinzhou, Liaoning, 121000 China
| | - Xiujuan Yang
- College of New Energy, Bohai University, Jinzhou, Liaoning, 121000 China
| | | |
Collapse
|
19
|
Fernandes S, Esteves da Silva JC, Pinto da Silva L. Life Cycle Assessment of the Sustainability of Enhancing the Photodegradation Activity of TiO 2 with Metal-Doping. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E1487. [PMID: 32218246 PMCID: PMC7178238 DOI: 10.3390/ma13071487] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 03/20/2020] [Accepted: 03/24/2020] [Indexed: 12/13/2022]
Abstract
While TiO2 nanoparticles have shown potential as photocatalysts in the degradation of organic contaminants, their inability to absorb efficiently visible light has limited their industrial application. One strategy for solving this problem is monodoping TiO2 photocatalysts with transition metals, which has worked in the degradation of several pollutants. However, it is not clear if this improvement is enough to offset the potential environmental impacts of adding metal ions to the synthesis of TiO2. Herein, we have used Life Cycle Assessment (LCA) to determine the sustainability of monodoping TiO2 with transition metals (Fe, Co, Mn and Ni, with a 1% weight ratio) to enhance the photocatalytic properties of the photocatalyst toward the degradation of Carbamazepine and Methyl Orange, under UV-A and visible light irradiation. We found that the addition of transition-metals has no significant effect on the environmental impacts associated with the synthesis of TiO2, when a weight-based functional unit was considered. However, when photocatalytic activity was considered, major differences were found. Thus, our results demonstrate that the sustainability of monodoping with different transition metals is solely determined by their ability to enhance (or not) the photocatalytic activity of TiO2. Our data also demonstrated that isopropyl alcohol constitutes a critical point in the synthesis of TiO2 photocatalysts, with ethanol being a potential substitute.
Collapse
Affiliation(s)
- Sónia Fernandes
- Chemistry Research Unit (CIQUP), Faculty of Sciences of University of Porto, R. Campo Alegre 697, 4169-007 Porto, Portugal; (S.F.)
| | - Joaquim C.G. Esteves da Silva
- Chemistry Research Unit (CIQUP), Faculty of Sciences of University of Porto, R. Campo Alegre 697, 4169-007 Porto, Portugal; (S.F.)
- LACOMEPHI, GreenUPorto, Department of Geosciences, Environmental and Territorial Planning, Faculty of Sciences of University of Porto, R. Campo Alegre 697, 4169-007 Porto, Portugal
| | - Luís Pinto da Silva
- Chemistry Research Unit (CIQUP), Faculty of Sciences of University of Porto, R. Campo Alegre 697, 4169-007 Porto, Portugal; (S.F.)
- LACOMEPHI, GreenUPorto, Department of Geosciences, Environmental and Territorial Planning, Faculty of Sciences of University of Porto, R. Campo Alegre 697, 4169-007 Porto, Portugal
| |
Collapse
|
20
|
El Mragui A, Logvina Y, Pinto da Silva L, Zegaoui O, Esteves da Silva JC. Synthesis of Fe- and Co-Doped TiO 2 with Improved Photocatalytic Activity Under Visible Irradiation Toward Carbamazepine Degradation. MATERIALS 2019; 12:ma12233874. [PMID: 31771256 PMCID: PMC6926595 DOI: 10.3390/ma12233874] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 11/20/2019] [Accepted: 11/21/2019] [Indexed: 11/26/2022]
Abstract
Pure TiO2 and Fe- and Co-doped TiO2 nanoparticles (NPs) as photocatalysts were synthesized using wet chemical methods (sol-gel + precipitation). Their crystalline structure and optical properties were analyzed using X-ray diffraction (XRD), Raman spectroscopy and Fourier-transform infrared (FTIR) spectroscopy, ultraviolet-visible light (UV-Vis) diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The photocatalytic activity of the synthesized nanoparticles was evaluated through degradation of carbamazepine (CBZ) under UV-A and visible-light irradiations. The XRD and Raman analyses revealed that all synthesized nanomaterials showed only the anatase phase. The DRS results showed that the absorption edge was blue-shifted for Fe-doped TiO2 NPs. The decrease in charge recombination was evidenced from the PL investigation for both Co-doped and Fe-doped TiO2 nanomaterials. An enhancement in photocatalytic degradation of carbamazepine in aqueous suspension under both UV-A light and visible-light irradiations was observed for Fe-doped Titania NPs by comparison with pure TiO2. These results suggest that the doping cations could suppress the electron/hole recombination. Therefore, the photocatalytic activity of TiO2-based nanomaterials was enhanced.
Collapse
Affiliation(s)
- Abderrahim El Mragui
- Chemistry Research Unit (CIQUP), Faculty of Sciences of University of Porto, Rua do Campo Alegre 697, 4169-007 Porto, Portugal; (A.E.M.); (Y.L.); (L.P.d.S.)
- Research team “Materials and Applied Catalysis: MCA”, “CBAE” Laboratory, Faculty of Sciences, Moulay Ismail University, BP.11201 Zitoune, Meknès, Morocco;
| | - Yuliya Logvina
- Chemistry Research Unit (CIQUP), Faculty of Sciences of University of Porto, Rua do Campo Alegre 697, 4169-007 Porto, Portugal; (A.E.M.); (Y.L.); (L.P.d.S.)
| | - Luís Pinto da Silva
- Chemistry Research Unit (CIQUP), Faculty of Sciences of University of Porto, Rua do Campo Alegre 697, 4169-007 Porto, Portugal; (A.E.M.); (Y.L.); (L.P.d.S.)
- LACOMEPHI, GreenUPorto, Department of Geosciences, Environment and Territorial Planning, Faculty of Sciences, University of Porto, Rua do Campo Alegre 697, 4169-007 Porto, Portugal
| | - Omar Zegaoui
- Research team “Materials and Applied Catalysis: MCA”, “CBAE” Laboratory, Faculty of Sciences, Moulay Ismail University, BP.11201 Zitoune, Meknès, Morocco;
| | - Joaquim C.G. Esteves da Silva
- Chemistry Research Unit (CIQUP), Faculty of Sciences of University of Porto, Rua do Campo Alegre 697, 4169-007 Porto, Portugal; (A.E.M.); (Y.L.); (L.P.d.S.)
- LACOMEPHI, GreenUPorto, Department of Geosciences, Environment and Territorial Planning, Faculty of Sciences, University of Porto, Rua do Campo Alegre 697, 4169-007 Porto, Portugal
- Correspondence: ; Tel.: +351-220-402-569
| |
Collapse
|