Phenol photodegradation over titanium dioxide

Abstract

Abstract The heterogeneous photocatalytic oxidation of phenol in aqueous diluted solutions over TiO 2 particles under UV‐illumination has been investigated. It has been observed that the yield of the phenol photooxidation depends strongly on the pH of the solution. Maximum yields are obtained at pH 8 and also in very alkaline media. These results are explained considering the processes that take place at the surface of the semiconductor, in which OH radicals have an important role. With respect to the initial charge transfer steps a kinetic analysis has been performed. From this analysis it was deduced that the constant rate of formation of OH radicals is about 4.0 × 10 4 times greater than the constant rate of the direct reaction between phenol and photogenerated holes in the TiO 2 particles. Finally, from HPLC analysis, hydroquinone, para quinone and 1,2.4‐benzenetriol have been detected as intermediate products prior to the total phenol mineralization.