Sulfur(IV) oxidation by hydrogen peroxide in aqueous suspensions of SiO2, Al2O3, TiO2 and zeolite

Abstract Normal and stopped-flow spectrophotometry were used to study the rate of oxidation of sulfur(IV) (SO 3 2− /HSO 3 − ) by H 2 O 2 in aqueous suspensions of finely divided SiO 2 , Al 2 O 3 , TiO 2 and Na-A-zeolite buffered at pH 8.2 and 4.0. Within the limits of error, the rate constants obtained agree with those measured in the absence of suspended material, i.e. under the given conditions there is no surface catalytic effect to be observed.