| 1 | Photoelectrochemical degradation of Methylene Blue with β-PbO_2 electrodes driven by visible light irradiation显示文摘β-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 β-PbO2 crystals were on the electrode and it had a high oxygen evolution potential.The photoactivity and photoelectrochemical(PEC) properties of the β-PbO2 electrode were investigated under visible light irradiation(λ > 420 nm) for the decolorization of Methylene Blue.Pseudo first-order kinetics parameter(Kapp) for dye decolorization using the β-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 β-PbO2 electrode.A significant synergetic effect was observed in the PEC system.We also employed TiO2 modified β-PbO2 electrodes in this test,which revealed that the TiO2 immobilized on the β-PbO2 electrode inhibited the visible light-induced PEC efficiency despite the amount of TiO2 used for electrode preparation.The β-PbO2 electrode was also superior to the dimensionally stable anode(Ti/Ru0.3Ti0.7O2) in visible light-induced photoactivity and PEC efficiency. | Guoting Li HoYin Yip Kin Hang Wong Chun Hu Jiuhui Qu Po Keung Wong | 2011 | Journal of Environmental Sciences2011，23，6： | 4 |
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