Oxygen vacancies on the BiOCl surface promoted photocatalytic complete NO oxidation via superoxide radicals |
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| Affiliation: | 1. College of Environment and Ecology, Chongqing University, Chongqing 400040, China;2. Institute of Fundamental and Frontier Sciences, School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 611731, China;3. College of Architecture and Environment, Sichuan University, Chengdu 610065, 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. School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, PR China;2. Engineering Research Center Clean Production of Textile Dyeing and Printing, Ministry of Education, Wuhan 430073, PR 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. Research Center for Environmental and Energy Catalysis, 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 New Energy and Materials, Southwest Petroleum University, Chengdu, 610500, China;4. State Centre for International Cooperation on Designer Low-Carbon and Environmental Materials (CDLCEM), School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China;1. College of Architecture and Environment, Sichuan University, Chengdu 610065, China;2. National Engineering Research Center for Flue Gas Desulfurization, Chengdu 610065, China;3. Institute of New Energy and Low Carbon Technology, Sichuan University, Chengdu 610065, Sichuan, China;1. Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, Sichuan, China;2. School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 611731, Sichuan, China;3. College of Architecture and Environment, Sichuan University, Chengdu 610065, Sichuan, China;4. Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China |
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| Abstract: | One of the core issues in the photocatalytic oxidation of nitric oxide is the effective conversion of NO into the final product (nitrate). More than just improving the visible light photocatalytic performance of BiOCl, we aim to inhibit the generation of toxic by-product NO2 during this process. In this study, we demonstrate that the oxygen vacancies (OVs) modulate its surface photogenerated carrier transfer to inflect the NO conversion pathway by a facile mixed solvent method to induce OVs on the surface of BiOCl. The photocatalytic NO removal efficiency under visible light increased from 5.6% to 36.4%. In addition, the production rate of NO2 is effectively controlled. The effects of OVs on the generation of reactive oxygen species, electronic transfer, optical properties, and photocatalytic NO oxidation are investigated by combining density functional theory (DFT) theoretical calculations, the in situ FTIR spectra and experimental characterization. The OVs on the surface of BiOCl speed the trapping and transfer of localized electrons to activate the O2, producing O2 −, which avoid NO2 formation, resulting in complete oxidation of NO (NO + O2− → NO3−). These findings can serve as the basis for controlling and blocking the generation of highly toxic intermediates through regulating the reactive species during the NO oxidation. It also can help us to understand the role of OV on the BiOCl surface and application of photocatalytic technology for safe air purification. |
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| Keywords: | Oxygen vacancies BiOCl Visible light NO oxidation Toxic byproduct Reactive oxygen species |
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