| 水体中磺胺甲唑间接光降解作用 |
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| 引用本文： | 李聪鹤,车潇炜,白莹,石晓勇,苏荣国.水体中磺胺甲唑间接光降解作用[J].环境科学,2019,40(1):273-280. |
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| 作者姓名： | 李聪鹤 车潇炜 白莹 石晓勇 苏荣国 |
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| 作者单位： | 中国海洋大学化学化工学院, 海洋化学理论与工程技术教育部重点实验室, 青岛 266100;中国水产科学研究院黄海水产研究所, 农业农村部海洋渔业可持续发展重点实验室, 青岛 266071;中国海洋大学化学化工学院, 海洋化学理论与工程技术教育部重点实验室, 青岛 266100;国家海洋局海洋减灾中心, 北京 100194 |
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| 基金项目： | 国家重点研发计划项目（2016YFC1402101，2016YFC1400602） |
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| 摘 要： | 间接光降解是水体药物类污染物的主要去除途径之一,而有色溶解有机物(CDOM)是间接光降解的主要参与者.CDOM经过光照作用后产生大量活性中间体,与药物类污染物进行反应,完成间接光降解.本文着重研究了4种来源不同的CDOM对磺胺甲噁唑(SMZ)的间接光解作用和影响因素.结果表明,CDOM对于SMZ具有显著间接光降解作用,这种间接光降解具有双重性,既可以通过生成各种活性中间体来促进SMZ的间接光降解,又可以通过光屏蔽作用以及活性中间体掩蔽作用抑制SMZ的光降解.SMZ的间接光降解主要由CDOM产生的3CDOM*、HO·、1O2等活性中间体控制,其中3CDOM*为SMZ间接光降解的主要参与者.另外,pH、盐度和硝酸根离子对SMZ的间接光降解均具有显著影响作用,而碳酸氢根离子对于SMZ间接光降解的影响作用不明显.
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| 关 键 词： | 有色溶解有机物(CDOM) 磺胺甲恶唑(SMZ) 间接光降解 活性中间体 光屏蔽 |
| 收稿时间： | 2018/5/2 0:00:00 |
| 修稿时间： | 2018/6/28 0:00:00 |
Indirect Photodegradation of Sulfamethoxazole in Water |
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| LI Cong-he,CHE Xiao-wei,BAI Ying,SHI Xiao-yong and SU Rong-guo.Indirect Photodegradation of Sulfamethoxazole in Water[J].Chinese Journal of Environmental Science,2019,40(1):273-280. |
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| Authors: | LI Cong-he CHE Xiao-wei BAI Ying SHI Xiao-yong and SU Rong-guo |
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| Institution: | Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 261000, China,Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 261000, China,Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China,Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 261000, China;National Marine Hazard Mitigation Service, Beijing 100194, China and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 261000, China |
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| Abstract: | Indirect photodegradation is one of the primary approaches for the removal of pharmaceutical contaminants from water. This degradation process is dominated by chromophoric dissolved organic matter (CDOM). After illumination, CDOM produces many reactive intermediates, which can react with drug pollutants to achieve indirect photodegradation. In this article, we focused on four different sources of CDOM and factors affecting indirect sulfamethoxazole (SMZ) photolysis. The results show that the indirect photodegradation effect of SMZ is significantly influenced by CDOM. This indirect photodegradation has a dual nature. It promotes the indirect photodegradation of SMZ through the formation of various reactive intermediates and at the same time inhibits the photodegradation of SMZ through light shielding and masking of reactive intermediates. The indirect photodegradation of SMZ is mainly controlled by active intermediates such as 3CDOM*, HO·, and 1O2 produced by CDOM; 3CDOM* is the main participant in indirect photodegradation of SMZ. In addition, the pH, salinity, and nitrate ions have a significant effect on the indirect photodegradation of SMZ, while bicarbonate ions have no significant effect on the indirect photodegradation of SMZ. |
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| Keywords: | chromophoric dissolved organic matter (CDOM) sulfamethoxazole(SMZ) indirect photodegradation active intermediates light shielding |
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