Photoelectrochemical degradation of Methylene Blue with -PbO2 electrodes
driven by visible light irradiation |
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Authors: | Guoting Li HoYin Yip Kin Hang Wong Chun Hu Jiuhui Qu and Po Keung Wong |
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Institution: | 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-ray
photoelectron spectroscopy, and linear sweep voltammetry. We confirmed pure -PbO2 crystals were on the electrode and it had a high
oxygen evolution potential. The photoactivity and photoelectrochemical (PEC) properties of the -PbO2 electrode were investigated
under visible light irradiation ( > 420 nm) for the decolorization of Methylene Blue. Pseudo first-order kinetics parameter (Kapp) for
dye decolorization using the -PbO2 electrode achieved 6.71×10?4 min?1 under visible light irradiation, which indicated its excellent
visible 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 light
irradiation 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 electrode
inhibited the visible light-induced PEC efficiency despite the amount of TiO2 used for electrode preparation. The -PbO2 electrode was
also 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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