Photolysis of chlortetracycline in aqueous solution: Kinetics, toxicity and products
文献类型：期刊论文
| 作者 | Chen, Yong ; Li, Hua ; Wang, Zongping ; Tao, Tao ; Wei, Dongbin ; Hu, Chun |
| 刊名 | Environmental Sciences & Ecology
 |
| 出版日期 | 2012 |
| 卷号 | 24期号:2页码:254-260 |
| 关键词 | chlortetracycline direct photodegradation phototoxicity photoproducts |
| ISSN号 | 1001-0742 |
| 中文摘要 | The aqueous photodegradation of the widely used antibiotic chlortetracycline (CTC) was investigated under simulated sunlight. The quantum yield of photodegradation increased from 3.3 x 10(-4) to 8.5 x 10(-3) within the pH range of 6.0 to 9.0. The presence of Ca2+, Fe3+, and NO3- enhanced the photodegradation of CTC, whereas Mg2+, Mn2+, and Zn2+ inhibited the degradation with the order Mn2+ > Zn2+ > Mg2+ at pH 7.3. The monovalent cations (Na+ and K+) had negligible effect on the photolysis of CTC. Fulvic acid (FA) decreased the photodegradation of CTC due to light screening effect. Hydrogen peroxide (H2O2) was formed concurrently with direct photodegradation of CTC. The generation rate of H2O2 increased from 0.027 to 0.086 mu mol/(L.min) when the pH ranged from 6.0 to 9.0. The CTC solution was about three-fold more toxic to the Photobacterium phosphoreum bacteria after irradiation, suggesting that the photoproducts and H2O2 formed in the CTC solution exhibited high risk on the bacteria. By LC-ESI(+)-MS, the photoproducts of CTC were identified. The direct photodegradation of CTC was involved in hydroxylation and N-demethyl/dedismethyl processes. The main photoproducts included the iso-CTC analog containing hydroxyl groups (m/z 511.4 and 495.4), and the N-demethyl/dedismethyl products of the photoproduct m/z 495.4 (m/z 481.3 and 467.4). In addition, the photochemical dechlorination of CTC led to tetracycline (m/z 445.5). |
| WOS记录号 | WOS:000300653300011 |
| 公开日期 | 2014-11-28 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/8156]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Chen, Yong,Li, Hua,Wang, Zongping,et al. Photolysis of chlortetracycline in aqueous solution: Kinetics, toxicity and products[J]. Environmental Sciences & Ecology,2012,24(2):254-260. |
| APA | Chen, Yong,Li, Hua,Wang, Zongping,Tao, Tao,Wei, Dongbin,&Hu, Chun.(2012).Photolysis of chlortetracycline in aqueous solution: Kinetics, toxicity and products.Environmental Sciences & Ecology,24(2),254-260. |
| MLA | Chen, Yong,et al."Photolysis of chlortetracycline in aqueous solution: Kinetics, toxicity and products".Environmental Sciences & Ecology 24.2(2012):254-260. |
入库方式： OAI收割
来源：生态环境研究中心
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