Photocatalytic decomposition of 4-chlorophenol over oxide catalysts.
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.
Hügül
M
M
University of Istanbul, Faculty of Engineering, Department of Chemistry, Turkey.
Boz
I
I
Apak
R
R
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*
D002733:Chlorophenols; D006256:Hazardous Waste; D010087:Oxides; D014873:Water Pollutants; C029107:4-chlorophenol