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Comparison of photooxidation and photoreduction reactions on TiO2 nanoparticles

Lookup NU author(s): Dr Terry Egerton

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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. © 2006 Elsevier B.V. All rights reserved.

Publication metadata

Author(s): Egerton TA, Mattinson JA

Publication type: Article

Publication status: Published

Journal: Journal of Photochemistry and Photobiology A: Chemistry

Year: 2007

Volume: 186

Issue: 2-3

Pages: 115-120

Print publication date: 25/02/2007

ISSN (print): 1010-6030

ISSN (electronic): 1873-2666

Publisher: Elsevier

URL: http://dx.doi.org/10.1016/j.jphotochem.2006.07.018

DOI: 10.1016/j.jphotochem.2006.07.018

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