European Journal of Chemistry 2011, 2(2), 163-167. doi:10.5155/eurjchem.2.2.163-167.369

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


Umar Ibrahim Gaya (1,*)

(1) Department of Pure and Industrial Chemistry, Bayero University Kano, 3011, Kano State, Nigeria
(*) Corresponding Author

Received: 09 Dec 2010, Accepted: 03 Mar 2011, Published: 30 Jun 2011

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

Keywords


Oxidation; Mechanism; Chlorophenol; ZnO; Photodegradation; Intermediates

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DOI: 10.5155/eurjchem.2.2.163-167.369

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How to cite


Gaya, U. Eur. J. Chem. 2011, 2(2), 163-167. doi:10.5155/eurjchem.2.2.163-167.369
Gaya, U. Comparative analysis of ZnO-catalyzed photo-oxidation of p-chlorophenols. Eur. J. Chem. 2011, 2(2), 163-167. doi:10.5155/eurjchem.2.2.163-167.369
Gaya, U. (2011). Comparative analysis of ZnO-catalyzed photo-oxidation of p-chlorophenols. European Journal of Chemistry, 2(2), 163-167. doi:10.5155/eurjchem.2.2.163-167.369
Gaya, Umar. "Comparative analysis of ZnO-catalyzed photo-oxidation of p-chlorophenols." European Journal of Chemistry [Online], 2.2 (2011): 163-167. Web. 22 Nov. 2019
Gaya, Umar. "Comparative analysis of ZnO-catalyzed photo-oxidation of p-chlorophenols" European Journal of Chemistry [Online], Volume 2 Number 2 (30 June 2011)

DOI Link: https://doi.org/10.5155/eurjchem.2.2.163-167.369

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