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International Journal of Photoenergy
Volume 2, Issue 2, Pages 59-66

Photocatalytic degradation of salicylic acid on fixed TiO2 - kinetic studies

Département de Chimie Physique des Réactions - UMR 7630 CNRS-INPL, ENSIC, 1, rue Grandville, BP 451, NANCY CEDEX F-54001, France

Copyright © 2000 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The photocatalytic activity of TiO2 deposits (Degussa-P25 and Sachtleben-Hombikat) has been studied using salicylic acid as a model water pollutant and an UV-fluorescent lamp as a light source. Both catalysts have shown very similar properties towards the photocatalytic degradation of salicylic acid. Special attention has been given to the effect of the light flux absorption and of the pollutant adsorption. Moderate mass-transfer limitation has been found. Specific parameters of the phenomenon have then been determined for the two catalysts and a simple general expression of the rate of photocatalytic degradation has been derived.