Abstract
The photolysis of S 2 O 8 2 - was studied for the removal of acetic acid in aqueous solution and compared with the H 2O 2/UV system. The SO 4 - radicals generated from the UV irradiation of S 2 O 8 2 - ions yield a greater mineralization of acetic acid than the OH radicals. Acetic acid is oxidized by SO 4 - radicals without significant formation of intermediate by-products. Increasing system pH results in the formation of OH radicals from SO 4 - radicals. Maximum acetic acid degradation occurred at pH 5. The results suggest that above this pH, competitive reactions with the carbon mineralized inhibit the reaction of the solute with SO 4 - and also OH radicals. Scavenging effects of two naturally occurring ions were tested; in contrast to HCO 3 - ions, the presence of Cl − ions enhances the efficiency of the S 2 O 8 2 - /UV process towards the acetate removal. It is attributed to the formation of the Cl radical and its great reactivity towards acetate.
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