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Qian H, Yuan B, Liu Y, Zhu R, Luan W, Zhang C. Oxygen vacancy enhanced photocatalytic activity of Cu 2O/TiO 2 heterojunction. iScience 2024; 27:109578. [PMID: 38638573 PMCID: PMC11024930 DOI: 10.1016/j.isci.2024.109578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 01/25/2024] [Accepted: 03/25/2024] [Indexed: 04/20/2024] Open
Abstract
In this study, a method was developed to create oxygen vacancies in Cu2O/TiO2 heterojunctions. By varying the amounts of ethylenediaminetetraacetic acid (EDTA), sodium citrate, and copper acetate, Cu2O/TiO2 with different Cu ratios were synthesized. Tests on CO2 photocatalytic reduction revealed that Cu2O/TiO2's performance is influenced by Cu content. The ideal Cu mass fraction in Cu2O/TiO2, determined by inductively coupled plasma (ICP), is between 0.075% and 0.55%, with the highest CO yield being 10.22 μmol g-1 h-1, significantly surpassing pure TiO2. High-resolution transmission electron microscopy and electron paramagnetic resonance studies showed optimal oxygen vacancy in the most effective heterojunction. Density functional theory (DFT) calculations indicated a 0.088 eV lower energy barrier for ∗CO2 to ∗COOH conversion in Cu2O/TiO2 with oxygen vacancy compared to TiO2, suggesting that oxygen vacancies enhance photocatalytic activity.
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Affiliation(s)
- Hong Qian
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 201306, P.R. China
| | - Binxia Yuan
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 201306, P.R. China
- School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Yuhao Liu
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 201306, P.R. China
| | - Rui Zhu
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 201306, P.R. China
| | - Weiling Luan
- School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Chengxi Zhang
- Department of Optoelectronic Information Science and Engineering, School of Science, Jiangsu University of Science and Technology, Zhenjiang 212100, China
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Zhang J, Zhou Z, Xiao B, Zhou C, Jiang Z, Liang Y, Sun Z, Xiong J, Chen G, Zhu H, Wang S. Visible-light photocatalytic degradation of water-soluble polyvinyl alcohol in aqueous solution by Cu 2O@TiO 2: Optimization of conditions, mechanisms and toxicity analysis. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 341:118054. [PMID: 37148766 DOI: 10.1016/j.jenvman.2023.118054] [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: 01/26/2023] [Revised: 04/24/2023] [Accepted: 04/27/2023] [Indexed: 05/08/2023]
Abstract
Polyvinyl alcohol (PVA), a water-soluble synthetic polymer, is one of the most prevalent non-native polyvinyl alcohols found in the environment. Due to its inherent invisibility, its potential for causing severe environmental pollution is often underestimated. To achieve efficient degradation of PVA in wastewater, a Cu2O@TiO2 composite was synthesized through the modification of titanium dioxide with cuprous oxide, and its photocatalytic degradation of PVA was investigated. The Cu2O@TiO2 composite, supported by titanium dioxide, facilitated photocarrier separation and demonstrated high photocatalytic efficiency. Under alkaline conditions, the composite exhibited a 98% degradation efficiency for PVA solutions and a 58.7% PVA mineralization efficiency. Radical capture experiments and electron paramagnetic resonance (EPR) analyses revealed that superoxide radicals primarily drive the degradation process within the reaction system. Throughout the degradation process, PVA macromolecules are broken down into smaller molecules, including ethanol, and compounds containing aldehyde, ketone, and carboxylic acid functional groups. Although the intermediate products exhibit reduced toxicity compared to PVA, they still pose certain toxic hazards. Consequently, further research is necessary to minimize the environmental impact of these degradation products.
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Affiliation(s)
- Jiaming Zhang
- School of Resources, Environment and Materials, Guangxi University, Nanning 530004, PR China
| | - Zhenqi Zhou
- School of Resources, Environment and Materials, Guangxi University, Nanning 530004, PR China
| | - Bing Xiao
- School of Resources, Environment and Materials, Guangxi University, Nanning 530004, PR China
| | - Chenxu Zhou
- School of Resources, Environment and Materials, Guangxi University, Nanning 530004, PR China
| | - Zhongqin Jiang
- School of Resources, Environment and Materials, Guangxi University, Nanning 530004, PR China
| | - Yinna Liang
- College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China
| | - Zhuo Sun
- College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China
| | - Jianhua Xiong
- School of Resources, Environment and Materials, Guangxi University, Nanning 530004, PR China; Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning, 530004, China.
| | - Guoning Chen
- Guangxi Bossco Environmental Protection Technology Co., Ltd., Nanning 530007, China
| | - Hongxiang Zhu
- Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning, 530004, China
| | - Shuangfei Wang
- Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning, 530004, China
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Yang SJ, Lin YK, Pu YC, Hsu YJ. Crystal Facet Dependent Energy Band Structures of Polyhedral Cu 2O Nanocrystals and Their Application in Solar Fuel Production. J Phys Chem Lett 2022; 13:6298-6305. [PMID: 35786932 DOI: 10.1021/acs.jpclett.2c01632] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
We demonstrated a facile hydrothermal method to synthesize the (100)-, (110)- and (111)-oriented Cu2O nanocrystals (NCs) by controlling the concentration of the incorporated anions (CO32- and SO32-). The crystal facet dependent activity of the orientation controlled Cu2O NCs in the rhodamine B (RhB) photodegradation and photocatalytic hydrogen (H2) evolution was found to follow the trend: (111) > (110) > (100). The mechanism was investigated by characterizing the optical property, energy band structure, interfacial charge carrier dynamics and reducing ability. The results indicated that the (111)-oriented Cu2O NCs exhibit the higher conduction band (CB) potential as compared with the (110)-oriented and (100)-oriented Cu2O NCs, which resulted in the largest driving force of interfacial electron transfer for (111)-oriented Cu2O NCs to carry out solar fuel generation. The current study offers an easy strategy for crystal facet engineering of semiconductors and provides important physical insights into their electronic properties for the desired solar energy conversions.
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Affiliation(s)
- Shan-Jen Yang
- Department of Materials Science, National University of Tainan, Tainan 70005, Taiwan
| | - Yin-Kai Lin
- Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, Taiwan 30010, Taiwan
| | - Ying-Chih Pu
- Department of Materials Science, National University of Tainan, Tainan 70005, Taiwan
| | - Yung-Jung Hsu
- Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, Taiwan 30010, Taiwan
- Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
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Motlagh PY, Soltani RDC, Pesaran Z, Akay S, Kayan B, Yoon Y, Khataee A. Sonocatalytic degradation of fluoroquinolone compounds of levofloxacin using titanium and zirconium oxides nanostructures supported on paper sludge/wheat husk-derived biochar. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2022.06.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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