Permanganate could be activated by UV photolysis at 254 nm, resulting in the efficient degradation of micropollutants. The degradation of four probe molecules and micropollutants resistant to permanganate oxidation, was enhanced by the UV/permanganate system, with pseudo first-order rate constants (k′) of 0.065-0.678 min-1 under the experimental conditions. This behavior was because Hydroxyl radicals (HO.) and Mn(V) peroxide were produced during the activation of permanganate by UV irradiation. The quantum yield of HO. was 0.025 mol Es-1 in the system. HO. oxidation primarily accounted for the degradation of nitrobenzene and gemfibrozil, while both HO. and Mn(V) were responsible for the degradation of benzoic acid, terephthalic acid, para-chlorobenzoic acid and nalidixic acid. This study is the first report on the activation of permanganate by UV irradiation for the abatement of micropollutants in water treatment, which may lead to a new advanced oxidation process relying on both HO. and reactive manganese species.

Activation of permanganate by UV irradiation for enhanced oxidation of micropollutants

2019 Fall National Meeting

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