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Liu J, Chang X, Yang Y, Sun J, Yan Q. Optimization of AgIO 3/Bi 4Ti 3O 12 composite photocatalyst to achieve enhanced photocatalytic performance by adjusting internal electric field via oxygen defect engineering. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 369:122408. [PMID: 39236611 DOI: 10.1016/j.jenvman.2024.122408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2024] [Revised: 08/18/2024] [Accepted: 08/31/2024] [Indexed: 09/07/2024]
Abstract
The construction of heterojunction is an effective and conventional method to improve the photocatalytic activity of photocatalysts. On this basis, how to further regulate the separation and migration of photogenerated carrier is worthy of further investigation. As a mature and efficient modification method, oxygen defect engineering was used to regulate the S-scheme heterojunction composed of AgIO3 and Bi4Ti3O12 to further enhance the photocatalytic activity of the constructed heterojunction in this study. In addition to improving the visible light absorption of the photocatalyst and providing active sites, the introduction of oxygen vacancies can also strengthen the internal electric field between the two semiconductors by expanding the Fermi level gap, which can be verified by Mott-Schottky experiment and DFT calculations, resulting in more efficient photogenerated carrier separation efficiency. As a result, compared with AgIO3/Bi4Ti3O12, the AgIO3/Bi4Ti3O12 heterojunction modulated by oxygen defect engineering exhibited excellent photocatalytic activity, which proves the feasibility of the regulation of the interfacial electric field. This work provides a new idea for the modulation strategy of the interface electric field.
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Affiliation(s)
- Jiayu Liu
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Henan, 450001, China
| | - Xinyue Chang
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Henan, 450001, China
| | - Yu Yang
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Henan, 450001, China
| | - Jingyu Sun
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Henan, 450001, China
| | - Qishe Yan
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Henan, 450001, China.
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Tao Y, Guan J, Zhang J, Hu S, Ma R, Zheng H, Gong J, Zhuang Z, Liu S, Ou H, Wang D, Xiong Y. Ruthenium Single Atomic Sites Surrounding the Support Pit with Exceptional Photocatalytic Activity. Angew Chem Int Ed Engl 2024; 63:e202400625. [PMID: 38556897 DOI: 10.1002/anie.202400625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 03/08/2024] [Accepted: 03/29/2024] [Indexed: 04/02/2024]
Abstract
Single-metal atomic sites and vacancies can accelerate the transfer of photogenerated electrons and enhance photocatalytic performance in photocatalysis. In this study, a series of nickel hydroxide nanoboards (Ni(OH)x NBs) with different loadings of single-atomic Ru sites (w-SA-Ru/Ni(OH)x) were synthesized via a photoreduction strategy. In such catalysts, single-atomic Ru sites are anchored to the vacancies surrounding the pits. Notably, the SA-Ru/Ni(OH)x with 0.60 wt % Ru loading (0.60-SA-Ru/Ni(OH)x) exhibits the highest catalytic performance (27.6 mmol g-1 h-1) during the photocatalytic reduction of CO2 (CO2RR). Either superfluous (0.64 wt %, 18.9 mmol g-1 h-1; 3.35 wt %, 9.4 mmol-1 h-1) or scarce (0.06 wt %, 15.8 mmol g-1 h-1; 0.29 wt %, 21.95 mmol g-1 h-1; 0.58 wt %, 23.4 mmol g-1 h-1) of Ru sites have negative effect on its catalytic properties. Density functional theory (DFT) calculations combined with experimental results revealed that CO2 can be adsorbed in the pits; single-atomic Ru sites can help with the conversion of as-adsorbed CO2 and lower the energy of *COOH formation accelerating the reaction; the excessive single-atomic Ru sites occupy vacancies that retard the completion of CO2RR.
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Affiliation(s)
- Yu Tao
- Department of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China
| | - Jianping Guan
- Department of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China
| | - Jian Zhang
- Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering Wenzhou University, Wenzhou, 325035, China
| | - Shouyao Hu
- Department of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China
| | - Runze Ma
- Department of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China
| | - Huanran Zheng
- Department of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China
| | - Jiaxin Gong
- Department of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China
| | - Zechao Zhuang
- Department of Chemistry, Tsinghua University, Beijing, 100084, China
- Department of Chemical Engineering, Columbia University, New York, NY 10027, USA
| | - Shoujie Liu
- School of Materials Science and Engineering, Anhui University, Anhui, 230601, China
| | - Honghui Ou
- Department of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi An Shi, Xi'an, 710049, China
| | - Dingsheng Wang
- Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Yu Xiong
- Department of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China
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Rana S, Kumar A, Sharma G, Dhiman P, García-Penas A, Stadler FJ. Recent advances in perovskite-based Z-scheme and S-scheme heterojunctions for photocatalytic CO 2 reduction. CHEMOSPHERE 2023; 339:139765. [PMID: 37562504 DOI: 10.1016/j.chemosphere.2023.139765] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 07/31/2023] [Accepted: 08/07/2023] [Indexed: 08/12/2023]
Abstract
The dramatic rise in carbon dioxide levels in the atmosphere caused by the continuous use of carbon fuels continues to have a significant impact on environmental degradation and the disappearance of energy reserves. Past few years have seen a significant increase in the interest in photocatalytic carbon dioxide reduction because of its ability to lower CO2 releases from the burning of fossil fuels while also producing fuels and important chemical products. Because of their excellent catalytic efficiency, great uniformity, lengthy charge diffusion layers and texture flexibility that enable accurate band gap and band line optimization, perovskite-based nanomaterials are perhaps the most advantageous among the numerous semiconductors proficient in accelerating CO2 conversion under visible light. Firstly, a brief insight into photocatalytic CO2 conversion mechanism and structural features of perovskites are discussed. Further the classification and selection of perovskites for Z and S-scheme heterojunctions and their role in photocatalytic CO2 reduction analysed. The efficient modification and engineering of heterojunctions via co-catalyst loading, morphology control and vacancy introduction have been comprehensively reviewed. Third, the state-of-the-art achievements of perovskite-based Z-scheme and S-scheme heterojunctions are systematically summarized and discussed. Finally, the challenges, bottlenecks and future perspectives are discussed to provide a pathway for applying perovskite-based heterojunctions for solar-to-chemical energy conversion.
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Affiliation(s)
- Sahil Rana
- International Research Centre of Nanotechnology for Himalayan Sustainability (IRCNHS), Shoolini University , 173229, Solan, India
| | - Amit Kumar
- International Research Centre of Nanotechnology for Himalayan Sustainability (IRCNHS), Shoolini University , 173229, Solan, India; College of Materials Science and Engineering, Shenzhen Key Laboratory of Polymer Science and Technology, Guangdong Research Center for Interfacial Engineering of Functional Materials, Nanshan District Key Laboratory for Biopolymers and Safety Evaluation, Shenzhen University, Shenzhen, 518055, PR China.
| | - Gaurav Sharma
- International Research Centre of Nanotechnology for Himalayan Sustainability (IRCNHS), Shoolini University , 173229, Solan, India; College of Materials Science and Engineering, Shenzhen Key Laboratory of Polymer Science and Technology, Guangdong Research Center for Interfacial Engineering of Functional Materials, Nanshan District Key Laboratory for Biopolymers and Safety Evaluation, Shenzhen University, Shenzhen, 518055, PR China
| | - Pooja Dhiman
- International Research Centre of Nanotechnology for Himalayan Sustainability (IRCNHS), Shoolini University , 173229, Solan, India
| | - Alberto García-Penas
- Departamento de Ciencia e Ingeniería de Materiales e Ingeniería Química (IAAB), Universidad Carlos III de Madrid, 28911, Legan'es, Spain
| | - Florian J Stadler
- College of Materials Science and Engineering, Shenzhen Key Laboratory of Polymer Science and Technology, Guangdong Research Center for Interfacial Engineering of Functional Materials, Nanshan District Key Laboratory for Biopolymers and Safety Evaluation, Shenzhen University, Shenzhen, 518055, PR China
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Wang L, Niu M, Liu Y, Xie Y, Ma Z, Zhang M, Hou C. The Ovs surface defecting of an S-scheme g-C 3N 4/H 2Ti 3O 7 nanoheterostructures with accelerated spatial charge transfer. J Colloid Interface Sci 2023; 645:639-653. [PMID: 37167913 DOI: 10.1016/j.jcis.2023.04.178] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 04/11/2023] [Accepted: 04/30/2023] [Indexed: 05/13/2023]
Abstract
Semiconductor photocatalysis was a rising star in the sustainable transformation of solar energy for environmental problems governance. Herein, an S-scheme g-C3N4/H2Ti3O7 heterostructure was constructed and applied to tetracycline hydrochloride (TCH) destruction. The g-C3N4/H2Ti3O7 composite has a superior photocatalytic property to degrade TCH in contrast with bare g-C3N4 and H2Ti3O7. The 20% g-C3N4/H2Ti3O7 (CNHTO20) composite exhibited the optimum photocatalytic performance, and the degradation efficiency of 20 mg/L TCH reached 87.37% within 3 h (K = 0.572 min-1). The affluent active sites of the g-C3N4 nanosheet and effective interfacial charge separation of the S-scheme pathway facilitated the excellent performance. Moreover, the ample oxygen vacancies (Ovs) act as the electron mediator, not only reducing the band gap energy by producing the formation of defect levels, but also broadening the photo response range and promoting the interfacial charge transfer. The coordination complexes formed between TCH molecules and Ti (IV) ions in CNHTO20 composites induce strong visible light absorption through ligand-metal charge transfer (LMCT). The Ti4+/Ti3+ metal cycle in CNHTO20 was conducive to the separation of the photogenerated electron-hole pairs on the heterojunction interface as well. The ESR characterization and trapping experiments certified that the dominant substances were OH, O2- and h+. The AQY calculated by the COD removal rate was 0.16%. Conclusively, the S-scheme heterojunction between H2Ti3O7 and g-C3N4 enabled the CNHTO photocatalyst with high redox ability and boosted photocatalytic performance accordingly. This study may shed some enlightenment on the construction of heterojunctions and the realistic treatment of wastewater.
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Affiliation(s)
- Liping Wang
- College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China
| | - Miaomiao Niu
- College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China
| | - Yi Liu
- College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China
| | - Yuke Xie
- College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China
| | - Zhichao Ma
- College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China
| | - Mingyuan Zhang
- College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China.
| | - Chentao Hou
- College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China.
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Hong T, Anwer S, Wu J, Deng C, Qian H. Semiconductor-metal-semiconductor TiO2@Au/g-C3N4 interfacial heterojunction for high performance Z-scheme photocatalyst. Front Chem 2022; 10:1050046. [DOI: 10.3389/fchem.2022.1050046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Accepted: 10/12/2022] [Indexed: 11/13/2022] Open
Abstract
We designed an edge-sites 2D/0D/2D based TiO2@Au/g-C3N4 Z-scheme photocatalytic system consists of highly exposed (001) TNSs@Au edge-site heterojunction, and the Au/g-C3N4 interfacial heterojunction. The designed photocatalyst was prepared by a facile and controlled hydrothermal synthesis strategy via in-situ nanoclusters-to-nanoparticles deposition technique and programable calcination in N2 atmosphere to get edge-site well-crystalline interface, followed by chemically bonded thin overlay of g-C3N4. Photocatalytic performance of the prepared TNSs@Au/g-C3N4 catalyst was evaluated by the photocatalytic degradation of organic pollutants in water under visible light irradiation. The results obtained from structural and chemical characterization conclude that the inter-facet junction between highly exposed (001) and (101) TNSs surface, and TNSs@Au interfacial heterojunction formed by a direct contact between highly crystalline TNSs and Au, are the key factors to enhance the separation efficiency of photogenerated electrons/holes. On coupling with overlay of g-C3N4 2D NSs synergistically offer tremendous reactive sites for the potential photocatalytic dye degradation in the Z-scheme photocatalyst. Particularly in the designed photocatalyst, Au nanoparticles accumulates and transfer the photo-stimulated electrons originated from anatase TNSs to g-C3N4via semiconductor-metal heterojunction. Because of the large exposed reactive 2D surface, overlay g-C3N4 sheets not only trap photoelectrons, but also provide a potential platform for increased adsorption capacities for organic contaminants. This work establishes a foundation for the development of high-performance Z-scheme photocatalytic systems.
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