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Kinetics of photocatalytic degradation of phenols with multiple substituent groups

Priya, MH and Madras, Giridhar (2006) Kinetics of photocatalytic degradation of phenols with multiple substituent groups. In: Journal of Photochemistry and Photobiology A: Chemistry, 179 (3). pp. 256-262.

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Abstract

The photocatalytic degradation of seven phenols, substituted with two of the following groups: chloro, methyl and nitro, was investigated using combustion-synthesized catalyst. The intermediates were analyzed and a possible pathway of degradation was proposed. The first order kinetic rate constants for the degradation of various phenols were determined. The rate of photocatalytic degradation followed the order: 4-chloro,3-methyl phenol > 2-chloro,4-methylphenol > 4-chloro,2-nitrophenol > 4-chloro,2-methyl phenol > 4-chloro,3-nitrophenol 2-chloro,4-nitrophenol > 4-methyl,2-nitrophenol. The overall degradation rate of 4-chloro,3-methyl phenol was nearly an order of magnitude faster than the degradation rate of 4-methyl,2-nitrophenol. Chloromethylphenols degraded faster than chloronitrophenols due to the ring deactivating characteristic of nitro group for hydroxyl radical attack. The nature of substituent groups plays a more important role than the position of the substituent groups in determining the degradation rate of multi-substituted phenols.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Photodegradation;Phenols;Substituted phenols;Degradation pathways and mechanisms
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 09 May 2006
Last Modified: 19 Sep 2010 04:26
URI: http://eprints.iisc.ernet.in/id/eprint/6582

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