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Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.51A [2012] >
IJC-A Vol.51A(04) [April 2012] >
| 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 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Source: | IJC-A Vol.51A(04) [April 2012]
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