Dye sensitized visible light degradation of phenolic compounds

Vinu, R and Polisetti, Sneha and Madras, Giridhar (2010) Dye sensitized visible light degradation of phenolic compounds. In: Chemical Engineering Journal, 165 (3). pp. 784-797.

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Abstract

The present research work reports the eosin Y (EY) and fluorescein (FL) sensitized visible light degradation of phenol, 4-chlorophenol (CP), 2,4-dichlorophenol (DCP) and 2,4,6-trichlorophenol (TCP) using combustion synthesized nano-TiO2 (CS TiO2). The rate of degradation of the phenolic compounds was higher in the presence of EY/CS TiO2 compared to FL/CS TiO2 system. A detailed mechanism of sensitized degradation was proposed and a mechanistic model for the rate of degradation of the phenolic compound was derived using the pyramidal network reduction technique. It was found that at low initial dye concentrations, the rate of degradation of the phenolic compound is first order in the concentration of the dye, while at high initial dye concentrations, the rate is first order in the concentration of the phenolic compound. The order of degradation of the different phenolic compounds follows: CP > TCP > DCP > phenol. The different phenolic and dye intermediates that were formed during the degradation were identified by liquid chromatography-mass spectrometry (LC-MS) and the most probable pathway of degradation is proposed. (C) 2010 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	Chemical Engineering Journal
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Dye sensitization;Photocatalysis;Visible light; Chlorophenols;Network reduction
Department/Centre:	Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	08 Apr 2011 06:21
Last Modified:	08 Apr 2011 06:21
URI:	http://eprints.iisc.ac.in/id/eprint/36046

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