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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 | Revised: 06 Feb 2011 | Accepted: 03 Mar 2011 | Published: 30 Jun 2011 | Issue Date: June 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.
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European Journal of Chemistry
Keywords
Oxidation; Mechanism; Chlorophenol; ZnO; Photodegradation; Intermediates
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DOI: 10.5155/eurjchem.2.2.163-167.369
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doi:10.1016/0021-9517(90)90269-P
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doi:10.1021/jo990820y
Supporting information
The Supplementary Material for this article can be found online at: Supplementary files
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. 29 May. 2023
Gaya, Umar.
"Comparative analysis of ZnO-catalyzed photo-oxidation of p-chlorophenols" European Journal of Chemistry [Online], Volume 2 Number 2 (30 June 2011)
The other citation formats (EndNote | Reference Manager | ProCite | BibTeX | RefWorks) for this article can be found online at: How to cite item
DOI Link: https://doi.org/10.5155/eurjchem.2.2.163-167.369
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