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科学通报  2015 

溶解性有机质及Cu(II)配位对磺胺二甲基嘧啶光转化的影响

DOI: 10.1360/N972015-00593, PP. 2900-2906

Keywords: 溶解性有机质(DOM),DOM激发三重态(3DOM*),Cu(II),磺胺二甲基嘧啶,磺胺抗生素,氢原子转移,配合作用

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Abstract:

磺胺类抗生素(SAs)是水环境中经常检出的一类微污染物,其检出浓度可达μg/L水平.抗生素因可诱导细菌抗药性及产生抗性基因而备受关注.光化学转化是抗生素类污染物在表层水体中的重要消减途径,影响其环境归趋和生态风险.水中溶解性物质可显著地影响抗生素的光化学行为.然而,水中溶解性有机质(DOM)及其与金属离子的相互作用对SAs光转化的影响机制仍不清楚.本文以水产和畜牧养殖中广泛使用的磺胺二甲基嘧啶(SMZ)为对象,考察了DOM及其与典型重金属离子Cu(II)的配合物对SMZ光转化的影响机理.结果表明,激发三重态DOM(3DOM*)是促进SMZ光降解的主要活性物种,其反应机理为电子转移伴随质子转移.DOM-Cu(II)复合体系中,DOM-Cu(II)配合物可以通过光致电荷转移生成·OH促进SMZ的光降解.

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