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

Paper ID Volume ID Publish Year Pages File Format Full-Text
40464 45855 2013 7 PDF Available
Title
Photocatalytic activity of aqueous WO3 sol for the degradation of Orange II and 4-chlorophenol
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.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (119 K)Download as PowerPoint slideHighlights► Orange II was degraded photocatalytically in aqueous WO3 sol. ► Effect of various reaction conditions on the degradation rate was examined. ► Mechanism and rate law were proposed to account for the obtained kinetic data. ► Mixing of WO3 with TiO2 enhanced significantly the degradation rate. ► Enhancement of activity by mixing sols was confirmed for the degradation of 4-CP.

Keywords
Photocatalyst; Tungsten oxide; Titanium dioxide; Sol; Kinetics
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Photocatalytic activity of aqueous WO3 sol for the degradation of Orange II and 4-chlorophenol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 454, 15 March 2013, Pages 30–36
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us