• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Aquatic photodegradation of clofibric acid under simulated sunlight irradiation: kinetics and mechanism analysis
【24h】

Aquatic photodegradation of clofibric acid under simulated sunlight irradiation: kinetics and mechanism analysis

机译：模拟阳光照射下水藻酸对光纤维的降解：动力学及机理分析

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Clofibric acid is one of the most frequently detected pharmaceuticals in various aquatic environments. Photodegradation of clofibric acid in water under simulated sunlight was investigated. The effects of different initial concentrations, pH conditions and dissolved oxygen were examined. Photodegradation of clofibric acid followed a pseudo-first-order kinetics model, and the rate decreased gradually with the increasing initial concentration of clofibric acid. Dissolved oxygen inhibited the photodegradation of clofibric acid. As a result of varying reaction species of clofibric acid, the initial pH conditions greatly influenced its photodegradation. Quenching experiments showed that the self-sensitization process via ·OH and ~(1) O _(2) occured during photodegradation of clofibric acid, and the bimolecular reaction rate constants of clofibric acid with ·OH and ~(1) O _(2) were determined via the competition kinetics method to be 3.93(±0.20) × 10 ~(8) and 2.38(±0.12) × 10 ~(6) L mol ~(?1) s ~(?1) , respectively. In addition, the transformation products of clofibric acid were identified by the UPLC-Q-TOF-MS microsystem, and eight products were detected. It is proposed that the photodegradation of clofibric acid occurred mainly via decarboxylation, dechlorination, ·OH addition and ~(1) O _(2) attack reaction.
机译：氯贝酸是在各种水生环境中最常检测到的药物之一。研究了模拟太阳光下水中氯纤维酸的光降解。检查了不同初始浓度，pH条件和溶解氧的影响。氯纤维酸的光降解遵循拟一级动力学模型，且速率随氯纤维酸初始浓度的增加而逐渐降低。溶解氧抑制了氯纤维酸的光降解。由于氯纤维酸的反应种类不同，初始pH条件极大地影响了其光降解性能。淬火实验表明，氯纤维酸的光降解过程中发生了·OH和〜（1）O _（2）的自增敏过程，以及氯纤维酸与·OH和〜（1）O _（2）的双分子反应速率常数。通过竞争动力学方法测定）分别为3.93（±0.20）×10〜（8）和2.38（±0.12）×10〜（6）L mol〜（？1）s〜（？1）。此外，通过UPLC-Q-TOF-MS微型系统鉴定了氯纤维酸的转化产物，并检测到八种产物。有人提出，氯纤维酸的光降解主要是通过脱羧，脱氯，·OH加成和〜（1）O _（2）攻击反应发生的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号