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Kinetics of Sonophotocatalytic Degradation of Anionic Dyes with Nano- TiO2

Vinu, R and Madras, Giridhar (2009) Kinetics of Sonophotocatalytic Degradation of Anionic Dyes with Nano- TiO2. In: Environmental Science and Technology, 43 (2). pp. 473-479.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/es8025648

Abstract

The current research work focuses on the combination of photocatalyticandsonocatalytic (sonophotocatalytic) degradation of anionic dyes, viz., Orange G, Remazol Brilliant Blue R, Alizarin Red S, Methyl Blue, and Indigo Carmine, with solution combustion synthesized $TiO_2$ $(CS TiO_2)$ and commercial Degussa P-25 $TiO_2$ (DP-25). The rate of sonophotocatalytic degradation of all the dyes and the reduction of total organic carbon was higher compared to the individual photo- and sonocatalytic processes. The effect of dissolved gases and ultrasonic intensity on the sonophotocatalytic degradation of the dyes was evaluated. A dual-pathway network mechanism of sonophotocatalytic degradation was proposed for the first time, and the rate equations were modeled using the network reduction technique. The kinetic rate coefficients of the individual steps were evaluated for all the systems by fitting the model with experimental data.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Chemical Society.
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Depositing User: Mr. Ramesh Chander
Date Deposited: 21 Feb 2010 11:02
Last Modified: 19 Sep 2010 05:24
URI: http://eprints.iisc.ac.in/id/eprint/18615

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