Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 152, Issue 1-3, Pages 175-181Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S1010-6030(02)00185-5
Keywords
acid orange 7; textile azo dyes; competition kinetics; heteropolyblue; polyoxometalates; photochemical treatment; SiW12O404- catalyst
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The azo dye acid orange 7 (AO7) was decolourized by SiW12O405-, the one-electron photo-chemically reduced form of SiW12O404- catalyst, in aqueous solutions of aerated and de-aerated sacrificial electron donor isopropanol. Under our experimental conditions, the AO7 decay rate depended upon the competition between the azo dye and molecular oxygen for SiW12O405-. The colour removal rate constant was found as 5.2 x 10(4) M-1 s(-1) by applying AO7-O-2 competition kinetics based on a simple kinetic reaction scheme. (C) 2002 Elsevier Science B.V. All rights reserved.
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