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- 저자 : Weiqun Chu (검색결과 2 건)
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Weiqun Chu,Hailong Liu,Qilin Zhang,Fangqin Li,Cheng Peng,Zhihai Cheng,Jiang Wu,Sorachon Yoriya,Ping He,Hai Zhang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.125 No.-
Regulation of carrier capture and transport is critical for the enhancement of photocatalytic activity. Inthis work, a Bi5O7I photocatalyst containing double vacant tazetta-like structure was synthesized byone-pot calcination. X-ray photoelectron spectroscopy (XPS) and electron spin resonance spectroscopy(ESR) analysis showed that the vacancy structure improved the activation performance of adsorbed oxygen,thereby promoting the participation of superoxide radicals in the photocatalytic reaction. The resultsof electron paramagnetic resonance (EPR), electrochemical impedance spectroscopy (EIS) and timeresolvedphotoluminescence spectroscopy (TRPL) revealed that the defect state induced by double vacanciescould adjust the electron transport pathway, and the fluorescence lifetime could reach 3.043 ns,which greatly improved the photocatalytic reactivity. We further tested the photocatalytic activity ofheavy metal mercury removal experiment, and the optimal photocatalytic mercury removal efficiencyincreased to 83%. Finally, combining the results of DFT calculation and photocatalytic mercury removalexperiments, we proposed the photocatalytic reaction mechanism of Bi5O7I regulated by double vacancies. Our work provides a more convenient method for the design of defect engineering photocatalystsand provides effective theoretical support for photocatalytic removal of heavy metal mercury in flue gas.
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Yang Ling,Jiachen Li,Jiang Wu,Hailong Liu,Xu Mao,Yongfeng Qi,Qian Ma,Qizhen Liu,Zhanwei Qiao,Weiqun Chu 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.2
Elemental mercury removal in coal-fired power plants is the key to global mercury pollution control, and photocatalytic oxidation is an effective and stable method. As a typical bismuth-based photocatalyst, BiOIO3 has a large band gap which is not conducive to the absorption and utilization of visible light, and its specific surface area also limits the diffusion and adsorption of reactants. In this work, pink BiOIO3 (PB) was first prepared successfully via vacuum calcination under absolute pressure of 1*103 Pa. The specific surface area of pink BiOIO3 is significantly increased to 44.52m2/g, which is 1.5-times compared with the traditional BiOIO3 prepared by hydrothermal method (only 29.60 m2/g). Abundant oxygen vacancy defects exist on sample surface, and the formed local BiOI Zero-dimensional (0-D) nanodots provide heterojunction-like effect combined with the BiOIO3, obtaining better photocatalytic property in the oxidation of elemental mercury. The as-prepared pink BiOIO3 and the preparation technology also have strong application potential in the field of energy and environment.
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