title: Photoelectrochemical degradation of Methylene Blue with beta-PbO2 electrodes driven by visible light irradiation.
abstract: Beta-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 (beta-PbO2 crystals were on the electrode and it had a high oxygen evolution potential. The photoactivity and photoelectrochemical (PEC) properties of the beta-PbO2 electrode were investigated under visible light irradiation (lambda > 420 nm) for the decolorization of Methylene Blue. Pseudo first-order kinetics parameter (K(app)) for dye decolorization using the beta-PbO2 electrode achieved 6.71 x 10(-4) min(-1) under visible light irradiation, which indicated its excellent visible light-induced photoactivity. The K(app) of the PEC process was as much as 1.41 x 10(-3) min(-1) and was 1.71 times that of visible light irradiation or electrolysis even in the presence of the beta-PbO2 electrode. A significant synergetic effect was observed in the PEC system. We also employed TiO2 modified beta-PbO2 electrodes in this test, which revealed that the TiO2 immobilized on the beta-PbO2 electrode inhibited the visible light-induced PEC efficiency despite the amount of TiO2 used for electrode preparation. The beta-PbO2 electrode was also superior to the dimensionally stable anode (Ti/Ru(0.3)Ti(0.7)O2) in visible light-induced photoactivity and PEC efficiency.
authors: Department of Environmental and Municipal Engineering, North China University of Water Conservancy and Electric Power, Zhengzhou 450011, China. liguoting@ncwu.edu.cn
authors: Guoting
authors: G
authors: Li
authors: Hoyin
authors: H
authors: Yip
authors: Kin Hang
authors: KH
authors: Wong
authors: Chun
authors: C
authors: Hu
authors: Jiuhui
authors: J
authors: Qu
authors: Po Keung
authors: PK
authors: Wong
mesh_terms: D004396:Coloring Agents / Q000737:chemistry; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D004791:Enzyme Inhibitors / Q000737:chemistry; D007854:Lead / Q000737:chemistry*; D008027:Light; D008751:Methylene Blue / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D015394:Molecular Structure; D010087:Oxides / Q000737:chemistry*; D010777:Photochemistry / Q000379:methods*; D056951:Photoelectron Spectroscopy
chemical_list: D004396:Coloring Agents; D004791:Enzyme Inhibitors; D010087:Oxides; D007854:Lead; C047365:lead oxide; D008751:Methylene Blue