Acetone and chloride ion (Cl-) were used to synergistically activate peroxymonosulfate (PMS) to decolorize the azo dye, acid orange 7 (AO7). It was found that the first-order rate constant increased from 0.0767 to 0.1725min-1 when acetone was added in Cl-/PMS systemIn the acetone/Cl-/PMS system, effect of various factors were explored, including initial pH, Cl- concentration, PMS and acetone dosage. The results indicated that the degradation of AO7 increased with the increase of Cl-、PMS、acetone concentration under alkaline conditions. The degradation mechanism of AO7 in acetone/Cl-/PMS system showed that neither sulfate radical(SO-4·) nor hydroxyl(HO·) was produced therein. Instead, the HOCl concentration was proved to be increased during the reaction. Hence, acetone could promote the reaction between PMS and Cl- to generate more HOCl. From the analysis of UV-vis spectra, the azo bond and naphthalene ring in AO7 was found being destructed.
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