Inhibition of the toxic byproduct during photocatalytic NO oxidation via La doping in ZnO |
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| Authors: | Chaowei Yuan Wen Cui Yanjuan Sun Jiadong Wang Ruimin Chen Jin Zhang Yuxin Zhang Fan Dong |
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| Affiliation: | 1. Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China;2. Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China;3. The Center of New Energy Materials and Technology, School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, China;4. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;1. Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China;2. School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 611731, China;3. Department of Environmental Science and Engineering, Fuzhou University, Fuzhou 350108, China;4. The Center of New Energy Materials and Technology, School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China;5. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;1. State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;2. Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, Sichuang, China;3. Department of Physics, Chongqing University, Chongqing 401331, China;4. Engineering Research Center for Waste Oil Recovery Technology and Equipment, Ministry of Education, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China;5. College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China;1. Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China;2. School of Resources and Environment, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China;1. College of Architecture and Environment, Institute of New Energy and Low Carbon Technology, Sichuan University, Chengdu, Sichuan 610065, China;2. Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China;3. The Center of New Energy Materials and Technology, School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, China;4. State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;1. State Kay Laboratory of Coal Mine Disaster Dynamics and Control, College of Resource and Environmental Science, Chongqing University, Chongqing 400044, China;2. Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, Sichuan, China;3. Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China;4. College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China;5. State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;6. National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China |
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| Abstract: | It is of a great challenge to develop semiconductor photocatalysts with potential possibilities to simultaneously enhance photocatalytic efficiency and inhibit generation of toxic intermediates. In this study, we developed a facile method to induce the La doping and cationic vacancie (VZn) on ZnO for the highly efficient complete NO oxidation. The photocatalytic NO removal efficiency increases from 36.2% to 53.6%. Most importantly, a significant suppressed NO2 production also has been realized. According to the DFTcalculations, ESR spectra and in situ FTIR spectra, the introduction of La3+ induce the redistribution of charge carriers in La-ZnO, which promote the production of·O2- and lead to the formation of VZn for the formation of·OH, contributing to the complete oxidation of NO to nitrate. Besides, the conversion pathway of photocatalytic NO oxidation has been elaborated. This work paves a new way to simultaneously realize the photocatalytic pollutants removal and the inhibition of toxic intermediates generation for efficient and safe air purification. |
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| Keywords: | Photocatalytic NO oxidation Toxic byproduct Reactive oxygen species ZnO Cationic vacancie |
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