光解
化学
四环素
动力学
天然有机质
光化学
有机质
腐植酸
降级(电信)
微观世界
环境化学
有机化学
抗生素
物理
肥料
电信
量子力学
生物化学
计算机科学
作者
Chao Song,Kaixin Zhang,Xiaojuan Wang,Shan Zhao,Shuguang Wang
出处
期刊:Chemosphere
[Elsevier]
日期:2021-01-01
卷期号:263: 128338-128338
被引量:36
标识
DOI:10.1016/j.chemosphere.2020.128338
摘要
The residues of tetracycline in environment have raised increasing concern for the deleterious impact on ecological and human health. Natural organic matter (NOM), ubiquitous in natural waters, is unavoidable to encounter tetracycline, which might affect the fate of tetracycline in aquatic environment. In this study, we investigated the effect of natural organic matter (NOM) on the photolytic fate of tetracycline (TC). The photolysis kinetics of TC were evaluated with two representative NOM, tannic acid (TA) and gallic acid (GA). The presence of TA and GA obviously inhibited the removal of TC under UV irradiation with photolysis rate constant at 0.067 h−1 and 0.071 h−1, respectively, which were 32.3% and 28.3% less than that without TA and GA (0.099 h−1). Furthermore, NOM exhibited different impacts on both indirect photolysis and direct photolysis. NOM promoted the formation of hydroxyl radical, induced the generation of triplet-excited state NOM and thus greatly enhanced the indirect photolysis of TC. However, direct photolysis was almost completely inhibited by NOM via inner filter effect and interacting with TC to form ground-state complex with low photoreactive. Moreover, similar intermediates were detected in the presence and absence of NOM, indicating that NOM exhibited limited influence on the degradation pathways of TC. This study reveals the multiple roles of NOM on tetracycline photolysis, contributing to better understand the photolytic fate of antibiotics in natural waters.
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