O. Mohamed, Saleh A. Ahmed, M. F. Mostafa
Dec 15, 2008
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Journal
Journal of Photochemistry and Photobiology A-chemistry
Abstract
Abstract The present article embraces the photocatalytic oxidation (PCO) of three selected cyclohexyl alcohols namely cyclohexylmethanol ( 1 ), 2-cyclohexylethanol ( 2 ) and 1-cyclohexylethanol ( 3 ) using nanoparticles titanium dioxide (TiO 2 -P25) as a semiconductor photocatalyst in acetonitrile under aerated conditions. The photocatalytic experiments showed moderate conversion ratios (55.2%, 51.8% and 60.3%, respectively). The primary photocatalytic oxidation products are the corresponding aldehydes or ketones and acids. The photocatalytic oxidation products were identified mainly by GC and GC/MS techniques using authentic samples. Formation of electron–hole pair at the surface of the semiconductor nanoparticles followed by oxidation reaction was the suggested mechanism. A first-order kinetic model was observed for the photocatalytic oxidation of the investigated alcohols and the rate constants were calculated.