Abstract
Benzophenone-3 (BP-3), an organic ultraviolet (UV) filter, is reported to exhibit endocrine disruptive effects. In this study, the degradation of BP-3 by UV/H2O2 in aqueous solution was investigated by steady-state photolysis and laser flash photolysis experiments. The photolysis of BP-3 was not observed obviously after 8h under UV irradiation (λ=254nm), but the degradation of BP-3 could be conducted via UV/H2O2 due to the oxidation by hydroxyl radical (HO). At higher initial concentrations of BP-3, the degradation percentages decreased, and the optimal pH for the degradation of BP-3 was 6.0. The reaction of BP-3 and HO adhered to the pseudo-first-order kinetics. When the BP-3 concentration was 0.01mM, the rate constants of the apparent first-order reaction and second-order reaction between BP-3 and HO were 1.26×10−3s−1 and 2.97×1010M−1s−1, respectively. Several intermediate products were obtained and the primary reaction pathway of BP-3 and HO was proposed.
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