Effects of natural colloidal particles derived from a shallow lake on the photodegradation of ofloxacin and ciprofloxacin
Effects of natural colloidal particles derived from a shallow lake on the photodegradation of ofloxacin and ciprofloxacin
复制标题
浅湖天然胶体颗粒对氧氟沙星和环丙沙星光降解的影响
DOI：
10.1016/j.scitotenv.2021.145102
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发表时间：
2021-02-12
影响因子：
9.8
通讯作者：
Liu, Xinhui
中科院分区：
文献类型：
--
作者：
Cheng, Dengmiao;Liu, Haifan;Liu, Xinhui
天然胶体颗粒（natural colloidal particles，NCPs）在地表水中普遍存在，在有机污染物的阳光转化过程中发挥着重要作用。研究了NCPs对氧氟沙星（OFL）和环丙沙星（CIP）两种氟喹诺酮类抗生素（FQs）光降解的影响，并评价了胶体有机物（COM）的光敏性。结果表明，OFL和CIP在NCP溶液中的光降解速率常数（kobs）分别为9.28 × 10（-2）h（-1）~ 15.98 × 10（-2）h（-1）和63.88 × 10（-2）h（-1）~ 196.59 × 10（-2）h（-1），NCP能显著加快OFL和CIP的光降解速率。在大多数处理中，间接光降解（IP）占总降解量的50%以上，是两种荧光素的主要降解途径，特别是CIP，IP达到82%-94%。在IP过程中，胶体有机物（（COM）-C-3*）三重态对OFL和CIP光解的贡献分别接近42%和46%。COM的组成在荧光量子点的IP中起着重要的作用，其中陆源COM往往比生物源具有更高的光反应性。这项研究是必不可少的，在预测的光化学效应的FQs，也可以更好地了解真实的环境命运的抗生素污染物。(C)2021爱思唯尔有限公司版权所有。
Natural colloidal particles (NCPs), which are ubiquitous and abundant in surfacewaters, may play a crucial role in the sunlight-driven transformation of organic contaminants. This research focused on the effects of NCPs on the photodegradation of two fluoroquinolone antibiotics (FQs), ofloxacin (OFL) and ciprofloxacin (CIP), and assessed the photosensitivity of colloidal organicmatter (COM). Results showed that the photodegradation rate constants (kobs) of OFL and CIP in NCP solutions ranged from 9.28 x 10(-2) h(-1) to 15.98 x 10(-2) h(-1) and 63.88 x 10(-2) h(-1) to 196.59 x 10(-2) h(-1), respectively, and NCPs can significantly accelerate the photodegradation rate of OFL and CIP. Indirect photodegradation (IP) accounted for >50% of the overall observed degradation in most treatments and was the dominant degradation pathway for the two FQs, especially for CIP, for which IP reached 82%-94%. In the IP process, the contributions of triplet states of colloidal organicmatter ((COM)-C-3*) to the photolysis of OFL and CIP were close to 42% and 46%, respectively. The compositions of COM played an important role in the IP of the FQs, amongwhich terrestrial sources of COM tended to have higher photoreactivity than biological sources. This study is essential in predicting the photochemical effect of FQs and also allows for a better understanding of the real environmental fate of antibiotic contaminants. (C) 2021 Elsevier B.V. All rights reserved.