Citation: ZHUANG Jian-Dong, TIAN Qin-Fen, LIU Ping. Bi2Sn2O7 Visible-Light Photocatalysts: Different Hydrothermal Preparation Methods and Their Photocatalytic Performance for As(Ⅲ) Removal[J]. Acta Physico-Chimica Sinica, ;2016, 32(2): 551-557. doi: 10.3866/PKU.WHXB201511304
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Bi2Sn2O7, synthesized through different hydrothermal routes (the microwave hydrothermal method (MH-BSO) and the traditional hydrothermal method (TH-BSO)), was used for photocatalytic removal of arsenic from aqueous solution. The as-synthesized Bi2Sn2O7 products were characterized by X-ray diffraction (XRD), N2 sorption-desorption, UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), transmission electron microscopy (TEM), electron spin resonance (ESR), X-ray photoelectron spectra (XPS), and electrochemistry technology. Under visible light irradiation, the MH-BSO sample exhibited a higher photocatalytic activity (up to 98.7%) than that of the TH-BSO sample during the oxidization of arsenite (AsO3)3-. The active species, O2-· and hVB+, were identified as the primary active species responsible for As(Ⅲ) oxidation. In addition, a possible mechanism for the photo-oxidation of As(Ⅲ) over Bi2Sn2O7 is proposed.
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