Concentration-dependent photodegradation kinetics and hydroxyl-radical oxidation of phenicol antibiotics

文献类型： 外文期刊

第一作者： Li, Kai

作者： Li, Kai;Zhao, Yuanfeng;Li, Kai;Zhang, Peng;Ge, Linke;Ren, Honglei;Yu, Chunyan;Chen, Xiaoyang

作者机构：

关键词： Phenicol antibiotics;Photolysis;Competition kinetics;Photooxidation;Transformation products

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

ISSN： 0045-6535

年卷期： 2014 年 111 卷

页码：

收录情况： SCI

摘要： Thiamphenicol and florfenicol are two phenicol antibiotics widely used in aquaculture and are ubiquitous as micropollutants in surface waters. The present study investigated their photodegradation kinetics, hydroxyl-radical ((OH)-O-.) oxidation reactivities and products. Firstly, the photolytic kinetics of the phenicols in pure water was studied as a function of initial concentrations (C-0) under UV-vis irradiation (lambda > 200 nm). It was found that the kinetics was influenced by C-0. A linear plot of the pseudo-first-order rate constant vs C-0 was observed with a negative slope. Secondly, the reaction between the phenicol antibiotics and (OH)-O-. was examined with a competition kinetic method under simulated solar irradiation (lambda > 290 nm), which quantified their bimolecular reaction rate constants of (2.13 +/- 0.02) x 10(9) M-1 s(-1) and (1.82 +/- 0.10) x 10(9) M-1 s(-1) for thiamphenicol and florfenicol, respectively. Then the corresponding (OH)-O-. oxidated half-lives in sunlit surface waters were calculated to be 90.5-106.1 h. Some main intermediates were formed from the reaction, which suggested that the two phenicols underwent hydroxylation, oxygenation and dehydrogenation when (OH)-O-. existed. These results are of importance to assess the phenicol persistence in wastewater treatment and sunlit surface waters. (C) 2014 Elsevier Ltd. All rights reserved.

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