Abstract
This report discusses the effects of the initial concentration of 4-chlorophenol (4-CP) on its solar light photoinduced oxidation/mineralization kinetics on Bi2WO6 catalyst. Photocatalytic degradation followed the Langmuir-Hinshelwood (L-H) mechanism. From the kinetic data the Langmuir adsorption equilibrium constant of 4-CP on the Bi2WO6 surface and the L-H maximum reaction rate for 4-CP oxidation have been evaluated. Chromatographic and spectroscopy studies show the presence of p-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 CO2 measurement show that photocatalytic mineralization of the phenolic compound was readily possible in a wide concentration range.
Highlights
In recent years, a large number of investigations have focused on the development of visible light induced heterogeneous photocatalyst for its applications in solar energy conversion and environmental wastewater purification [1,2,3,4]
This method induces an important decrease in the organic load and toxicity of wastewater; these authors have considered that the photodegradation reaction follows first order kinetics [22], obtaining the overall oxidation rate constant from linear plots of ln(c(t)/c0) versus t
Less effort has been expended on measuring the kinetic parameters of environmental pollutant degradation and mineralization according to a heterogeneous catalysis model like LangmuirHinshelwood kinetics
Summary
A large number of investigations have focused on the development of visible light induced heterogeneous photocatalyst for its applications in solar energy conversion and environmental wastewater purification [1,2,3,4]. The photoinduced degradation of 4-chlorophenol (a water soluble hazardous material widely used in paper, pharmaceutical, pesticide, and coal industries) [17,18,19] with Bi2WO6 nanocatalysts under visible light irradiation has been tested [20, 21] This method induces an important decrease in the organic load and toxicity of wastewater; these authors have considered that the photodegradation reaction follows first order kinetics [22], obtaining the overall oxidation rate constant from linear plots of ln(c(t)/c0) versus t. The kinetic parameters of this model are reported and mechanistic implications are discussed
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