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Kinetics of photocatalytic degradation of trichloroethylene in aqueous colloidal solutions of TiO2 and WO3 nanoparticles

Paper ID Volume ID Publish Year Pages File Format Full-Text
26744 43974 2012 6 PDF Available
Title
Kinetics of photocatalytic degradation of trichloroethylene in aqueous colloidal solutions of TiO2 and WO3 nanoparticles
Abstract

Kinetic studies on the photocatalytic degradation of trichloroethylene (TCE) were performed in TiO2 or WO3 aqueous sol which consisted of anatase nanocrystalline TiO2 of ca. 3.9 nm or WO3 spherical particles of ca. 17.6 nm. Photocatalytic activity of TiO2 colloid is higher than that of WO3 by a factor of 2.1. Kinetic analyses for both sols give a similar rate law containing γ value which represents a ratio of the reaction rate of the photogenerated electrons with O2 against the total disappearance rate of the photogenerated electrons. Reaction temperature did not affect the TiO2 photocatalysis whereas higher temperature increased the oxidation rate of TCE in the WO3 sol. Such a difference in the temperature effect was explained in terms of the γ values. The photocatalytic degradation of TCE was enhanced by mixing the WO3 and the TiO2 sol and the best performance was obtained by using the mixed sol with WO3:TiO2 molar ratio of 1:2. In the mixed sol, the similar temperature dependence as in the WO3 sol was obtained. Reaction mechanism and the rate law are proposed to account for the obtained kinetic data.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► TCE was most effectively degraded in the mixed sol of TiO2/WO3 (2:1). ► Temperature-effect on the reaction rate in the WO3 was similar to the TiO2/WO3 sol. ► Mechanism and rate law were proposed to account for the obtained kinetic data.

Keywords
Photocatalysis; Tungsten oxide; Titanium dioxide; Colloids; Kinetics
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Kinetics of photocatalytic degradation of trichloroethylene in aqueous colloidal solutions of TiO2 and WO3 nanoparticles
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 249, 1 December 2012, Pages 15–20
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
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