Photocatalytic activity of aqueous WO3 sol for the degradation of Orange II and 4-chlorophenol

Authors: Suzuko Yamazaki, Taiki Yamate, Kenta Adachi

Abstract:
Photocatalysis of a transparent aqueous WO₃ sol was investigated for the color-fading of Orange II. Dependence of the degradation rate of Orange II on pH and ionic strength of the WO₃ sol was explained in terms of the electrostatic interaction between Orange II and the WO₃ colloid particles. The degradation rate follows the first-order kinetics with respect to the concentration of Orange II. It was demonstrated that the photogenerated electron in WO₃ reduced O₂ effectively since the photochromism of the WO₃ sol observed under nitrogen atmosphere did not occur under air-saturated condition. The photocatalytic activity of WO₃ was lower than that of TiO₂ by a factor of 0.5 and was enhanced by mixing with the TiO₂ sol. The best photocatalytic performance for the degradation of Orange II was obtained by using the mixed sol with WO₃:TiO₂ molar ratio of 1:2. Similar enhancement in the photocatalytic activity was confirmed for the degradation of 4-chlorophenol.

Keywords:
Photocatalyst
Tungsten oxide
Titanium dioxide
Sol
Kinetics

Published in: Applied catalysis A: General  (Volume 454, Pages 1-172, 15 March 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Photocatalytic activity of aqueous WO3 sol for the degradation of Orange II and 4-chlorophenol

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