title: Photocatalytic decomposition of 4-chlorophenol over oxide catalysts.
abstract: 4-Chlorophenol in the presence of catalysts was decomposed in aqueous solution by a 125 W medium pressure mercury lamp in a thermostated quartz batch photoreactor, and the organic bound chlorine was catalytically converted into the environmentally less harmful inorganic chloride. Differences in the concentration of 4-chlorophenol and of the intermediates, such as hydroquinone and quinone, are followed by HPLC. The best catalyst among a homolog series for the photo-decomposition of 4-chlorophenol was selected as finely dispersed platinum oxide on a TiO2 semiconductor support, and kinetic parameters of the Langmuir-Hinshelwood type decomposition reaction were reported for the selected catalyst. A simple mechanism of substrate degradation in accord with the chosen kinetic model was postulated. The developed process may serve photooxidative removal of chlorophenols in wastewater without using costly oxidants.
authors.affiliation: University of Istanbul, Faculty of Engineering, Department of Chemistry, Turkey.
authors.forename: M
authors.initials: M
authors.lastname: Hügül
authors.forename: I
authors.initials: I
authors.lastname: Boz
authors.forename: R
authors.initials: R
authors.lastname: Apak
mesh_terms: D001673:Biodegradation, Environmental; D002733:Chlorophenols / Q000032:analysis / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid; D006256:Hazardous Waste / Q000517:prevention & control*; D006801:Humans; D010087:Oxides / Q000737:chemistry / Q000378:metabolism*; D010782:Photolysis; D014873:Water Pollutants / Q000032:analysis / Q000378:metabolism*
chemical_list: D002733:Chlorophenols; D006256:Hazardous Waste; D010087:Oxides; D014873:Water Pollutants; C029107:4-chlorophenol