Near-UV-VIS light induced acid orange 7 bleaching in the presence of SiW12O404- catalyst

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Arslan-Alaton I., Ferry J.

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, vol.152, pp.175-181, 2002 (SCI-Expanded)

• Publication Type: Article / Article
• Volume: 152
• Publication Date: 2002
• Doi Number: 10.1016/s1010-6030(02)00185-5
• Journal Name: JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
• Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
• Page Numbers: pp.175-181
• Istanbul Technical University Affiliated: Yes

Abstract

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.