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oai:ojs.www.eurjchem.com:article/369 2011-06-30T10:44:15Z eurjchem:ART driver

Comparative analysis of ZnO-catalyzed photo-oxidation of p-chlorophenols Gaya, Umar Ibrahim Oxidation Mechanism Chlorophenol ZnO Photodegradation Intermediates 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. Atlanta Publishing House LLC 2011-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf application/pdf https://www.eurjchem.com/index.php/eurjchem/article/view/369 10.5155/eurjchem.2.2.163-167.369 European Journal of Chemistry; Vol. 2 No. 2 (2011): June 2011; 163-167 2153-2257 2153-2249 eng https://www.eurjchem.com/index.php/eurjchem/article/view/369/PDF https://www.eurjchem.com/index.php/eurjchem/article/view/369/2530