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Tang JY, Liu XJ, Guo RT, Wang J, Wang QS, Pan WG. Constructing Cu defect band within TiO 2 and supporting NiO x nanoparticles for efficient CO 2 photoreduction. Dalton Trans 2024; 53:4088-4097. [PMID: 38314797 DOI: 10.1039/d3dt04191c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
Effectively harnessing solar energy for the conversion of CO2 into valuable chemical energy presents a viable solution to address energy scarcity and climate change concerns. Nonetheless, the limited light absorption and sluggish charge kinetics significantly hinder the photoreduction of CO2. In this study, we employed a facile sol-gel method combined with wetness impregnation to synthesize Cu-doped TiO2 coated with NiOx nanoparticles. Various characterizations verified the successful incorporation of Cu ions into the TiO2 crystal lattice and the formation of NiOx co-catalysts within the composites. The optimal performance attained with CTN-0.5 demonstrates an output of 11.85 μmol h-1 g-1 for CO and 9.51 μmol h-1 g-1 for CH4, which represent a 4.4-fold and 15.6-fold increase, respectively, compared to those achieved with pure TiO2. The induced Cu defect band broadens the light absorption by decreasing the conduction band edge of TiO2, while NiOx upshifts the valence band of TiO2 because of the interaction of valence orbitals. Light irradiation EPR and FTIR tests suggest that the collaboration of CuOx and NiOx promotes the formation of oxygen vacancies/defects and a rapid charge transfer pathway, thereby provides numerous active sites and electrons to enhance CO2 photoreduction performance.
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Affiliation(s)
- Jun-Ying Tang
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Xiao-Jing Liu
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, China.
| | - Rui-Tang Guo
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, China.
| | - Juan Wang
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Qing-Shan Wang
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Wei-Guo Pan
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, China.
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Yu H, Cao X, Zhang S, Luo S, Feng L, An X, Jiang H, Yao S. Nano-sized aggregate Ti 3C 2-TiO 2 supported on the surface of Ag 2NCN as a Z-scheme catalyst with enhanced visible light photocatalytic performance. Dalton Trans 2023; 52:14640-14648. [PMID: 37788010 DOI: 10.1039/d3dt02430j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
Exposing the photocatalyst's highly active facets and hybridizing the photocatalyst with suitable cocatalysts in the proper spot have been recognized as strong methods for high-performance photocatalysts. Herein, Ag2NCN/TiO2-Ti3C2 composites were synthesized by applying simple calcination and physically weak interaction deposition processes to obtain an excellent photocatalyst for Rhodamine B (Rh B) degradation when exposed to visible light. The findings from the experiments reveal that the Ag2NCN/TiO2-Ti3C2400 composite exhibited an outstanding photocatalytic rate in 80 min, with the highest Rh B degradation rate (k = 0.03889 min-1), which was 16 times higher than that of pure Ag2NCN (k = 0.00235 min-1) and 2.2 times higher than that of TiO2-Ti3C2400 (k = 0.01761 min-1). The results from the following factors: (i) the powerful interfacial contact created by the in situ formation of TiO2, and the superior electrical conductivity of Ti3C2 that makes carrier separation possible; (ii) TiO2 with electron-rich (101) facets are deposited on the surface of Ag2NCN, significantly reducing charge carrier recombination by trapping photoelectrons; (iii) a Z-type heterojunction is constructed between nanosize aggregate Ti3C2-TiO2 and Ag2NCN with non-metal Ti3C2 as the solid medium, improving the transfer and separation of photogenerated charges and inhibiting the recombination of electrons and holes. Additionally, the redox ability of the composite photocatalyst is enhanced. Furthermore, the analyses of active species showed that photogenerated superoxide radicals and holes were the principal active agents inside the photodegradation of Rh B. Moreover, the composite exhibited outstanding photo-stability.
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Affiliation(s)
- Haidong Yu
- Liaoning Engineering Research Center for Treatment and Recycling of Industrially Discharged Heavy Metals, Shenyang University of Chemical Technology, Shenyang 110142, China
- Langfang Natural Resources Comprehensive Survey Center, China Geological Survey, Langfang 065000, China
| | - Xuan Cao
- Liaoning Engineering Research Center for Treatment and Recycling of Industrially Discharged Heavy Metals, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Shuji Zhang
- Langfang Natural Resources Comprehensive Survey Center, China Geological Survey, Langfang 065000, China
| | - Shanxia Luo
- Langfang Natural Resources Comprehensive Survey Center, China Geological Survey, Langfang 065000, China
| | - Liang Feng
- Langfang Natural Resources Comprehensive Survey Center, China Geological Survey, Langfang 065000, China
| | - Xiaoyu An
- Langfang Natural Resources Comprehensive Survey Center, China Geological Survey, Langfang 065000, China
| | - Haibing Jiang
- Langfang Natural Resources Comprehensive Survey Center, China Geological Survey, Langfang 065000, China
| | - Shuhua Yao
- Liaoning Engineering Research Center for Treatment and Recycling of Industrially Discharged Heavy Metals, Shenyang University of Chemical Technology, Shenyang 110142, China
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Querebillo CJ. A Review on Nano Ti-Based Oxides for Dark and Photocatalysis: From Photoinduced Processes to Bioimplant Applications. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:982. [PMID: 36985872 PMCID: PMC10058723 DOI: 10.3390/nano13060982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 02/13/2023] [Accepted: 02/24/2023] [Indexed: 06/18/2023]
Abstract
Catalysis on TiO2 nanomaterials in the presence of H2O and oxygen plays a crucial role in the advancement of many different fields, such as clean energy technologies, catalysis, disinfection, and bioimplants. Photocatalysis on TiO2 nanomaterials is well-established and has advanced in the last decades in terms of the understanding of its underlying principles and improvement of its efficiency. Meanwhile, the increasing complexity of modern scientific challenges in disinfection and bioimplants requires a profound mechanistic understanding of both residual and dark catalysis. Here, an overview of the progress made in TiO2 catalysis is given both in the presence and absence of light. It begins with the mechanisms involving reactive oxygen species (ROS) in TiO2 photocatalysis. This is followed by improvements in their photocatalytic efficiency due to their nanomorphology and states by enhancing charge separation and increasing light harvesting. A subsection on black TiO2 nanomaterials and their interesting properties and physics is also included. Progress in residual catalysis and dark catalysis on TiO2 are then presented. Safety, microbicidal effect, and studies on Ti-oxides for bioimplants are also presented. Finally, conclusions and future perspectives in light of disinfection and bioimplant application are given.
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Affiliation(s)
- Christine Joy Querebillo
- Leibniz-Institute for Solid State and Materials Research (IFW) Dresden, Helmholtzstr. 20, 01069 Dresden, Germany
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Wang F, Liu R, Xu Q, Zhang CY. Flower-like Ag 2WO 4/CeO 2 heterojunctions with oxygen vacancies and expedited charge carrier separation boost the photocatalytic degradation of dyes and drugs. Dalton Trans 2022; 51:10179-10185. [PMID: 35735164 DOI: 10.1039/d2dt01420c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Charge carrier separation is a very important factor in photocatalysis, and it may be achieved through a variety of paths including the construction of heterojunctions and the formation of surface defects. Herein, we demonstrate the construction of flower-like Ag2WO4/CeO2 heterojunctions (namely ACs) by in situ deposition of Ag2WO4 on the surface of flower-like CeO2 with oxygen defects. The ACs with 2.3%, 3.8%, and 5.3% Ag2WO4 are defined as AC-1, AC-2, and AC-3, respectively, and we compare their photocatalytic removal efficiencies. Under visible light, AC-2 exhibits the highest photocatalytic removal efficiency toward cationic dye RhB and tetracycline (TC). The K value of AC-2 toward RhB degradation is determined to be 0.059 min-1, which is 7.56 and 8.94-fold higher than those of Ag2WO4 (0.0078 min-1) and CeO2 (0.0066 min-1), respectively. Moreover, the K value of AC-2 toward TC degradation (0.021 min-1) is 4.04 and 5.68-fold higher than those of Ag2WO4 (0.0052 min-1) and CeO2 (0.0037 min-1), respectively. Our results clearly demonstrate that the introduction of Ag2WO4 particles stimulates the formation of surface defects of CeO2, improves the visible light absorption, accelerates the charge carrier separation, and consequently boosts the photocatalytic degradation of dyes and drugs.
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Affiliation(s)
- Fangxiao Wang
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China.
| | - Rong Liu
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China.
| | - Qinfeng Xu
- School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, China.
| | - Chun-Yang Zhang
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China.
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Wang W, Zhu K, Zhang B, Chen X, Ma D, Wang X, Zhang R, Liu Y, Shen J, Dong P, Xi X. Improved photoredox activity of the 2D Bi 4Ti 3O 12–BiVO 4–Bi 4V 2O 10 heterostructure via the piezoelectricity-enhanced charge transfer effect. Dalton Trans 2022; 51:16389-16396. [DOI: 10.1039/d2dt02346f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The formation of the 2D Bi4Ti3O12–BiVO4–Bi4V2O10 heterostructure and the piezoelectric effect on photoredox activity improvements.
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Affiliation(s)
- Wuyou Wang
- School of Chemistry & Chemical Engineering, Yancheng Institute of Technology, Yancheng 224051, PR China
| | - Kai Zhu
- School of Chemistry & Chemical Engineering, Yancheng Institute of Technology, Yancheng 224051, PR China
- School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, PR China
| | - Beibei Zhang
- School of Chemistry & Chemical Engineering, Yancheng Institute of Technology, Yancheng 224051, PR China
| | - Xiaowei Chen
- School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, PR China
| | - Dongqi Ma
- School of Chemistry & Chemical Engineering, Yancheng Institute of Technology, Yancheng 224051, PR China
| | - Xuewen Wang
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, the College of Chemistry, Nanchang University, Nanchang 330031, PR China
| | - Rongbin Zhang
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, the College of Chemistry, Nanchang University, Nanchang 330031, PR China
| | - Yin Liu
- School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, PR China
| | - Jinxin Shen
- School of Chemistry & Chemical Engineering, Yancheng Institute of Technology, Yancheng 224051, PR China
| | - Pengyu Dong
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, PR China
| | - Xinguo Xi
- School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, PR China
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, PR China
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