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Preparation, Characterization and Photocatalytic Mechanism of Ag2CO3/BiVO4 Composite Microsheets
Author NameAffiliationE-mail
LIU Ren-Yue School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China  
WU Zhen School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China  
BAI Yu School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China  
YU Chang-Lin School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China yuchanglinjx@163.com 
LI Jia-De School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China  
SHU Qing School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China  
YANG Kai School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China
State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou 350002, China 
 
Abstract: BiVO4 microsheets with particle size of 1~2 μm were fabricated by hydrothermal method. Then, Ag2CO3/BiVO4 composite microsheet photocatalysts with different contents of Ag2CO3 were synthesized via precipitation method. The products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform-infrared (FTIR) spectroscopy, UV-Vis diffuse reflectance spectroscopy (DRS), photoluminescence (PL) emission spectroscopy, transient photocurrent-time response. The photocatalytic activity of the samples were evaluated by photocatalytic degradation of rhodamine B under visible light irradiation. The results showed that loading of Ag2CO3 was beneficial to improve the specific surface area and surface properties of the catalyst. Activity test indicated that BiVO4 loaded with optimal 10%(w/w)Ag2CO3 resulted in 4.4 times increase in activity with respect to BiVO4 under visible light illumination. The results of photoluminescence (PL) emission spectroscopy and transient photocurrent-time response showed that the coupled Ag2CO3 can effectively inhibit the recombination of photogenerated electrons and holes. Active radicals trapping experiments indicated that hole and hydroxyl radicals were the reactive oxygen species in this Ag2CO3/BiVO4 system. The enhancement in activity of Ag2CO3/BiVO4 could be attributed to the heterojunction structure formed by Ag2CO3 with wider band gap and BiVO4 with narrower band gap. This heterojunction effectively restrained the recombination of photogenerated electrons and holes. Moreover, the suitable energy band structure brought about strong oxidation ability due to more holes were produced.
Keywords: BiVO4 microsheet  heterojunction  visible light  Ag2CO3  hole
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LIU Ren-Yue,WU Zhen,BAI Yu,YU Chang-Lin,LI Jia-De,SHU Qing,YANG Kai.Preparation, Characterization and Photocatalytic Mechanism of Ag2CO3/BiVO4 Composite Microsheets[J].Chinese Journal of Inorganic Chemistry,2017,33(3):519-527.
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Chinese Journal of Inorganic Chemistry