Degradation of benzophenone-3 by the ozonation in aqueous solution: kinetics, intermediates and toxicity

Environmental Science and Pollution Research International
Yang GuoFei Qi

Abstract

Benzophenone-3 (BP-3) is a popular ultraviolet absorbing chemical and has an adverse impact on aquatic ecosystems and human health. We determined the reaction kinetic constants of BP-3 and its de-proton pattern reacting with the molecular ozone or hydroxyl radical (·OH) for the first time. The obtained constant of the molecular ozone reacting with BP-3 or BP-3(-) was 1.03(±0.21) × 10(2) or 1.85(±0.098) × 10(5) M(-1) s(-1), respectively. And, the constant for BP-3 reacting with ·OH was 9.74(±0.21) × 10(9) or 10.13(±0.25) × 10(9) M(-1) s(-1) as using 4-chlorobenzoic acid and benzotriazole as reference compounds, respectively. The intermediates generated in the molecular ozone (12 kinds) or ·OH oxidation (18 kinds) were identified by LC-MS/MS. The removal efficiency of BP-3 in ozonation was dependent on the initial concentration of ozone, BP-3, and matrix water quality. The detoxification of BP-3 ozonation was depended on initial ozone dose using Chlorella vulgaris as the probe. Higher ozone dose increased the toxicity of the solution for more BP-3 being degraded and more intermediates formed, suggesting that the sole ozonation is not an effect approach for the degradation of BP-3 and some other energy should be combined.

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Citations

Jul 24, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Song WangXiaoling Cao
Jun 10, 2017·Environmental Science and Pollution Research International·Martynas TichonovasDainius Martuzevicius
Oct 19, 2019·Ecotoxicology and Environmental Safety·Chao JinChunfeng Guan
May 5, 2021·The Science of the Total Environment·Megan CarveJeff Shimeta

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