European Journal of Chemistry

Comparative analysis of ZnO-catalyzed photo-oxidation of p-chlorophenols

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Published: Jun 30, 2011
DOI: https://doi.org/10.5155/eurjchem.2.2.163-167.369
Keywords:
Oxidation, Mechanism, Chlorophenol, ZnO, Photodegradation, Intermediates
Section
Research Article
Issue
Vol. 2 No. 2 (2011): June 2011
Dates
Received 2010-12-09
Accepted 2011-03-03
Published 2011-06-30


Main Article Content

Umar Ibrahim Gaya
Department of Pure and Industrial Chemistry, Bayero University Kano, 3011, Kano State, Nigeria

Abstract

The present study compares for the first time the photocatalytic oxidation of three p-chlorophenols (4-chlorophenol, 2,4-dichlorophenol and 2,4,6-trichlorophenol) in irradiated ZnO suspensions. The effect of operating parameters such as catalyst and concentration doses on the decomposition rate of these p-chlorinated compounds has been studied and optimized. The optimal feed concentration for each of the chlorinated phenolic compounds is 50 mg/L whereas the ZnO doses decreased as the number of chlorine substituent is increased. Kinetic profiles on the decomposition of chlorophenols over ZnO agreed with the pseudo-zeroeth order rate scheme with rate constants following the order 2,4,6-trichlorophenol > 2,4-dichlorophenol > 4-chlorophenol. The validity of the pseudo zero order model could be linked to the initial doses of the chlorophenols used vis-à-vis the catalyst. The study revealed stable intermediates of photocatalytic chlorophenol transformation by high performance liquid chromatography (HPLC) and gas chromatography-mass spectrometry (GC-MS) technique. A combined mechanism is given to account for the photocatalytic destruction of the chlorophenols.2_2_163_167_800

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Gaya, U. I. Comparative Analysis of ZnO-Catalyzed Photo-Oxidation of P-Chlorophenols. Eur. J. Chem. 2011, 2, 163-167.

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