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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 <i style="">p</i>H 12. The photocatalytic activity of AgBr-ZnO is higher than that of bare ZnO (prepared ZnO), commercial ZnO, TiO<sub>2</sub> and Degussa TiO<sub>2</sub>-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 <i style="">p</i>H, 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.
Description: 580-585
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.51A(04) [April 2012]

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