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The influence of platinum on UV and 'visible' photocatalysis by rutile and Degussa P25

Lookup NU author(s): Dr Terry Egerton, John Mattinson

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Abstract

The influence of platinum on the UV photocatalytic degradation of dichloroacetate anion (DCA) by a high area rutile and by the, mainly anatase, P25 form of TiO2 has been compared. Platinum was deposited photochemically and Pt(II) was generally more active than Pt(0) but the differences were small. Although the catalytic activity of rutile was much less than that of the P25, the effect of platinum addition was so much greater on rutile than on P25 that the activities of the Pt treated titanias were similar. Charge carrier separation by platinum is probably much more significant on rutile than on P25. Neither the platinum-free catalysts nor any of the Pt/P25 catalysts oxidized DCA when excited by 'visible' radiation (λmax = 435 and 490 nm). However, 'visible' light irradiation of Pt/rutile did oxidize DCA. Visible light photocatalysis by Pt/rutile was over three times faster than UV photocatalysis by untreated rutile powder. This suggests that electron trapping by Pt/rutile allows effective utilization of the small 405 nm component emitted by 'visible' radiation sources. © 2007 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: 2008

Volume: 194

Issue: 2-3

Pages: 283-289

ISSN (print): 1010-6030

ISSN (electronic): 1873-2666

Publisher: Elsevier SA

URL: http://dx.doi.org/10.1016/j.jphotochem.2007.08.026

DOI: 10.1016/j.jphotochem.2007.08.026

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