Degradation of climbazole by UV/chlorine process: Kinetics, transformation pathway and toxicity evaluation
Degradation of climbazole by UV/chlorine process: Kinetics, transformation pathway and toxicity evaluation
复制标题
紫外/氯过程降解甘巴巴：动力学、转化途径和毒性评价。
DOI：
10.1016/j.chemosphere.2018.12.023
复制
发表时间：
2019-03-01
期刊：
影响因子：
8.8
通讯作者：
Ying, Guang-Guo
中科院分区：
文献类型：
--
作者：
Cai, Wen-Wen;Peng, Tao;Ying, Guang-Guo
氯巴唑是一种广泛应用于家庭个人护理用品的抗真菌剂，在氯化消毒过程中发现其具有持久性。本文研究了紫外/氯法降解氯咪巴唑的动力学和机理。结果表明，与单独的紫外光解和氯化相比，紫外/氯化工艺显著提高了氯咪巴唑的降解。中性条件（pH 7）的氯咪巴唑产生的UV/氯的各种pH条件中的最高反应速率。天然水体中溶解性有机物和无机离子对氯咪巴唑的降解有一定的抑制作用。结果表明，氯咪巴唑降解的主要反应物种为羟基自由基（OH中心点）和氯自由基（Cl中心点），其二级反应速率常数分别为1.24 × 10（10）M-1 s（-1）和6.3 × 10（10）M-1 s（-1）.此外，在100 μ M的UV/Cl体系中，OH中心点和Cl-中心点对氯咪巴唑的去除贡献分别为82.2%和7.7%。氯咪巴唑在UV/Cl过程中的主要转化产物有11种。这些氧化产物没有引起比氯咪巴唑本身更大的毒性。本研究结果表明，氯代消毒与紫外光降解相结合，可以为传统消毒工艺中氯咪巴唑的去除提供一种有效的途径。(C)2018由Elsevier Ltd.出版
Climbazole is an antifungal agent widely used in household personal care products, and it was found persistent in chlorination disinfection process. Here we investigated the kinetics and mechanism of climbazole degradation by UV/chlorine process. The results showed that the UV/chlorine process dramatically enhanced degradation of climbazole when compared to the UV photolysis and chlorination alone. The neutral condition (pH 7) produced the highest reaction rate for the climbazole by UV/chlorine among the various pH conditions. Dissolved organic matter and inorganic ions in natural water showed moderate inhibition effects on the degradation of climbazole in the UV/chlorine process. Hydroxyl radical (OH center dot and chlorine radical (Cl-center dot) were found to be the main reactive species in the degradation of climbazole, with the second-order rate constant of 1.24 x 10(10) M-1 s(-1) and 6.3 x 10(10) M-1 s(-1), respectively. In addition, the OH center dot and Cl-center dot in the UV/chlorine at 100 mu M accounted for 82.2% and 7.7% contributions to theremoval of climbazole, respectively. Eleven of main transformation products of climbazole were identified in the UV/chlorine process. These oxidation products did not cause extra toxicity than climbazole itself. The findings from this study show that the combination of chlorination with UV photolysis could provide an effective approach for removal of climbazole during conventional disinfection process. (C) 2018 Published by Elsevier Ltd.