The Photocatalytic Oxidation of 4-Chlorophenol Using Bi2WO6under Solar Light Irradiation

[摘要] This report discusses the effects of the initial concentration of 4-chlorophenol (4-CP) on its solar light photoinduced oxidation/mineralization kinetics on Bi2WO6catalyst. Photocatalytic degradation followed the Langmuir-Hinshelwood (L-H) mechanism. From the kinetic data the Langmuir adsorption equilibrium constant of 4-CP on the Bi2WO6surface and the L-H maximum reaction rate for 4-CP oxidation have been evaluated. Chromatographic and spectroscopy studies show the presence ofp-benzoquinone and maleic acid as the main reaction products; these compounds first increase and then decay until they disappear. Chemical oxygen demand (COD) and produced CO2measurement show that photocatalytic mineralization of the phenolic compound was readily possible in a wide concentration range.

[学科分类] 物理化学和理论化学