Photoelectrochemical degradation of Methylene Blue with -PbO2 electrodesdriven by visible light irradiation |
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Authors: | Guoting Li HoYin Yip Kin Hang Wong Chun Hu Jiuhui Qu Po Keung Wong |
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Affiliation: | 1. Department of Environmental and Municipal Engineering, North China University of Water Conservancy and Electric Power,Zhengzhou 450011, China;School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, China 2. School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, China 3. State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences, Beijing 100085, China |
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Abstract: | -PbO2 electrodes were prepared by electro-deposition and characterized by scanning electron microscopy, X-ray diffraction, X-rayphotoelectron spectroscopy, and linear sweep voltammetry. We confirmed pure -PbO2 crystals were on the electrode and it had a highoxygen evolution potential. The photoactivity and photoelectrochemical (PEC) properties of the -PbO2 electrode were investigatedunder visible light irradiation ( > 420 nm) for the decolorization of Methylene Blue. Pseudo first-order kinetics parameter (Kapp) fordye decolorization using the -PbO2 electrode achieved 6.71×10?4 min?1 under visible light irradiation, which indicated its excellentvisible light-induced photoactivity. The Kapp of the PEC process was as much as 1.41×10?3 min?1 and was 1.71 times that of visible lightirradiation or electrolysis even in the presence of the -PbO2 electrode. A significant synergetic effect was observed in the PEC system.We also employed TiO2 modified -PbO2 electrodes in this test, which revealed that the TiO2 immobilized on the -PbO2 electrodeinhibited the visible light-induced PEC efficiency despite the amount of TiO2 used for electrode preparation. The -PbO2 electrode wasalso superior to the dimensionally stable anode (Ti/Ru0:3Ti0:7O2) in visible light-induced photoactivity and PEC efficiency. |
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Keywords: | photocatalysis photoelectrochemical process visible light -PbO2 electrode |
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