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Title: Mineralization of genotoxic Acid Violet 7 by AgBr-ZnO under alkaline conditions using direct sunlight
Authors: Krishnakumar, B
Velmurugan, R
Subash, B
Swaminathan, M
Keywords: Photocatalysis;Dye Degradation;Solar Light;Acid Violet 7;Zinc Oxide;Silver Bromide
Issue Date: Apr-2012
Publisher: NISCAIR-CSIR, India
Abstract: The photocatalytic degradation of a genotoxic azo dye, Acid Violet 7 (AV 7), using AgBr-ZnO in aqueous solution has been investigated under solar irradiation at pH 12. The photocatalytic activity of AgBr-ZnO is higher than that of bare ZnO (prepared ZnO), commercial ZnO, TiO2 and Degussa TiO2-P25 in the degradation of AV 7. Mechanism of degradation by AgBr-ZnO is proposed to explain its higher activity under solar light. The effects of operational parameters such as the amount of photocatalyst, dye concentration, initial pH, cations, anions and oxidants, on photomineralization by AgBr-ZnO have been analyzed. The degradation of AV 7 follows pseudo-first order kinetics according to the Langmuir-Hinshelwood model. Based on the intermediates formed during the photodegradation, a degradation pathway is proposed. The mineralization of AV 7 has also been confirmed by chemical oxygen demand measurements.
Page(s): 580-585
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.51A(04) [April 2012]

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