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The influence of platinum (II) on TiO2 photocatalyzed dye decolourization by rutile, P25 and PC500.

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


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The effect of deposition of 0.38% Pt(II) on the UV photocatalyzed decolouration of Reactive Orange 16 (RO16) and Malachite Green (MG) is reported for rutile TiO2, for anatase PC500, and for the mainly anatase P25. The metal loading and oxidation state were those that previously [17], gave the largest enhancement ( x37) of the UV photocatalyzed degradation of DCA, when Pt was deposited on rutile. For rutile, Pt(II) deposition enhanced the rate of UV decolouration (x20. for RO16, or x8, for MG). For PC500. Pt(II) deposition on PC500 reduced the decolouration of RO16 and increased the UV photocatalyzed decolouration of MG by only x1.2. On P25, Pt(II) significantly reduced the UV photocatalyzed decolouration of both dyes. Previously, [17], Pt(II) deposition on P25 enhanced DCA degradation by a factor of only 1.5. Complementary measurements showed that visible-light photocatalytic decolouration rates were small on all the catalysts. It was inferred that platinum influences the UV photocatalysis by facilitating the electron transfer to adsorbed oxygen, and that this facilitation is much more important for rutile than for anatase because formation of O-2(-) is more difficult on Pt-free anatase than on Pt-free rutile. (C) 2011 Elsevier B.V. All rights reserved.

Publication metadata

Author(s): Egerton TA, Purnama H, Mattinson JA

Publication type: Article

Publication status: Published

Journal: Journal of Photochemistry and Photobiology, A: Chemistry

Year: 2011

Volume: 224

Issue: 1

Pages: 31-37

Print publication date: 16/11/2011

ISSN (print): 1010-6030

ISSN (electronic): 1873-2666

Publisher: Elsevier S.A.


DOI: 10.1016/j.jphotochem.2011.09.003


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