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Photocatalytic Reduction of Azo Dyes Naphthol Blue Black and Disperse Blue 79

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Photocatalytic reduction of two textile azo dyes, Naphthol Blue Black (NBB) and Disperse Blue 79 (DB79) has been carried out in colloidal WO3 and TiO2 suspensions. Under bandgap excitation of the semiconductor colloids these dyes undergo irreversible reduction as they react with the trapped electrons. The quantum efficiency for the photocatalytic reduction of these dyes were 5.4% and 4.8% for NBB and DB79 respectively. The kinetics and mechanism of the interfacial charge transfer in these colloidal suspension has been elucidated with transient absorption spectroscopy. The reaction between the dye and trapped electrons is diffusion limited and occurs with rate constants of 1.1 x 108 M-1s-1 and 4.0 x107 M-1s-1 for NBB and DB79 respectively.

Affiliations: 1: Centre de Recherce en Photobiophysique, Université du Québec à Trois-Rivières, C.P. 500, Trois-Rivières, Québec, G9A 5H7, Canada; 2: Department of Chemistry, Indiana University Northwest, Gary, IN, 46408, USA; 3: ICI Canada Incorporated, 701 Richelieu Boulevard, McMasterville, Quebec, J3G 693, Canada; 4: Radiation Laboratory, University of Notre Dame, Notre Dame, IN, 46556, USA


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