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Comparison of photooxidation and photoreduction reactions on TiO2 nanoparticles

Paper ID Volume ID Publish Year Pages File Format Full-Text
28337 44071 2007 6 PDF Available
Title
Comparison of photooxidation and photoreduction reactions on TiO2 nanoparticles
Abstract

Photooxidation and photoreduction reaction rates on nanoparticulate TiO2 have been studied using a series of silica coated samples prepared from the same parent material—a high area rutile. Oxidation of propan-2-ol was measured by GC analysis of acetone product. Reduction of DPPH (1,1-diphenyl-2-picrylhydrazyl radical) was followed by the decrease in absorbance at 520 nm and photogreying of TiO2 was measured as a change in L, the reflectance of the CIE Y illuminant centred at 550 nm, using a Minolta chroma meter.The activity for oxidation of propan-2-ol correlated well with two measures of photoreduction, the reduction of the stable DPPH and TiO2 photogreying in an oxygen free system.In all cases, low silica loadings resulted in a small increase in activity. For silica levels >1 wt.% the dependence of activity decreased with increasing levels of silica treatment. The pattern of activity versus silica-level was consistent with elimination of both photooxidation and photoreduction at 12–16% silica. A speculative interpretation of these changes was based on changes in the silica environment as determined by magic angle spinning NMR.

Keywords
Photocatalysis; TiO2 rutile; Potogreying; Propan-2-ol; DPPH
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Comparison of photooxidation and photoreduction reactions on TiO2 nanoparticles
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 186, Issues 2–3, 25 February 2007, Pages 115–120
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
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Price was $35.95
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Price after discount Only $4.95
100% Money Back Guarantee
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