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Photodegradation of 2,3,4,5-tetrachlorophenol in water/methanol mixture

Paper ID Volume ID Publish Year Pages File Format Full-Text
28787 44091 2006 8 PDF Available
Title
Photodegradation of 2,3,4,5-tetrachlorophenol in water/methanol mixture
Abstract

The photodegradation of 2,3,4,5-tetrachlorophenol in water/methanol mixture using a low pressure 16 W mercury lamp was examined. The rate constants and quantum yields of the reaction were determined. The effect of pH on rate constants was also studied. The estimated first-order rate constants k for the phototransformation of 2,3,4,5-TeCP were found to be 6.48 × 10−3 min−1 (pH 2), 9.51 × 10−3 min−1 (pH 4.5) and 18.31 × 10−3 min−1 (pH 11). The determined quantum yield of TeCP reaction was 0.194 at pH 4.5.The kinetic curves for formation of less chlorinated photodecomposition products are also presented. Analysis of the intermediates showed that hydroxylation of chlorophenols (CP) was involved in the oxidation during photodegradation. Finally, the pathway of photodecomposition of these compounds is proposed.

Keywords
2,3,4,5-Tetrachlorophenol; Photodegradation; Rate constant; Quantum yield; Mechanism of reaction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 178, Issue 1, 20 February 2006, Pages 90–97
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
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