A steady-state photolytic investigation using TiO2as the photocatalyst in its reaction with uracil, thymine, 6-methyluracil and cytosine in an aqueous suspension has been carried out. Influence of initial [cytosine], amount of TiO2added and pH on the reaction rate and Φ were evaluated. The photoprocess obeys the Langmuir-Hinshelwood isotherm. Fe3+-doped TiO2prepared by the impregnation method was found to have a modified photocatalytic activity in the photooxidation of all the above-mentioned pyrimidine bases. The effect of calcination (preheat treatment) of the TiO2photocatalyst was a rate retardation. The role of these parameters on surface properties of TiO2is suitably explained. (C) 2000 Elsevier Science B.V.
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