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Does hydrogen peroxide really accelerate TiO₂ UV-C photocatalyzed decolouration of azo-dyes such as Reactive Orange 16?

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

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Abstract

A comparison of UV-C initiated decolourations of the anionic azo-dye Reactive Orange 16 by H2O2, by anatase TiO2 (PC500), and by H2O2/TiO2 is reported. The decolouration rates induced by H2O2, by TiO2 and by H2O2/TiO2, were compared in order to determine whether H2O2/TiO2 was more beneficial than either H2O2 or TiO2 alone. UV-C photolyses H2O2 to form hydroxyl radicals. UV-C can also initiate hydroxyl radical formation at the surface of TiO2, and in this study the photocatalytic conditions were chosen to enhance hydroxyl radical formation. In both cases the hydroxyl radicals lead to decolouration of the azo-dye Reactive Orange 16. Decolouration by irradiation of H2O2/TiO2 was 5 times faster than by the TiO2 photocatalyzed reaction but slower than that caused by irradiation of H2O2 alone. Thus, the relative order of decolouration rates is: UV-C/TiO2 < UV-C/TiO2/H2O2 < UV-C/H2O2. Estimates of the absorption of UV by both H2O2 and H2O2/Reactive Orange 16 solutions are used to show that this order is a consequence of the photonic efficiency of H2O2 photolysis being ten to a hundred times larger than the photonic efficiency of hydroxyl radical generation at the surface of TiO2. (C) 2013 Published by Elsevier Ltd.

Publication metadata

Author(s): Egerton TA, Purnama H

Publication type: Article

Publication status: Published

Journal: Dyes and Pigments

Year: 2014

Volume: 101

Pages: 280-285

Print publication date: 19/10/2013

ISSN (print): 0143-7208

ISSN (electronic): 1873-3743

Publisher: Elsevier B.V.

URL: http://dx.doi.org/10.1016/j.dyepig.2013.10.019

DOI: 10.1016/j.dyepig.2013.10.019

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