Chen Xiru, Xian Zeyu, Gao Song, Bai Lihua, Liang Sijia, Tian Haoting, Wang Chao, Gu Cheng
State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, Jiangsu 210023, PR China.
State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, Jiangsu 210023, PR China; Nanjing Kaver Scientific Instruments, Institute of Forestry Chemical Industry, China Academy of Forestry, Nanjing 210042, PR China.
Water Res. 2023 Apr 1;232:119651. doi: 10.1016/j.watres.2023.119651. Epub 2023 Jan 20.
Fluoroquinolone antibiotics (FQs) have been widely detected in the sediments due to vast production and consumption. In this study, the transformation of FQs was investigated in the presence of sediment mackinawite (FeS) under ambient conditions. Moreover, the role of dissolved oxygen was evaluated for the enhanced degradation of FQs induced by FeS. Our results demonstrated that typical FQs (i.e., flumequine, enrofloxacin and ciprofloxacin) could be efficiently adsorbed and degraded by FeS under neutral pH conditions. As indicated by the results of electron paramagnetic resonance analysis (EPR) and free radicals quenching experiments, hydroxyl radical and superoxide radical anions were identified as the dominant reactive species responsible for FQs degradation. Based on the results of product analysis and theoretical calculation, the degradation of FQs mainly occurred at the piperazine ring and quinolone structure. Our results show that FQs could be efficiently removed by FeS, which benefits understanding the transformation of antibiotics in the sediments, and even sheds light on the remediation of organic pollutants contaminated soils.
由于氟喹诺酮类抗生素（FQs）的大量生产和消费，其在沉积物中已被广泛检测到。在本研究中，考察了在环境条件下沉积物硫铁矿（FeS）存在时FQs的转化情况。此外，还评估了溶解氧对FeS诱导的FQs强化降解的作用。我们的结果表明，典型的FQs（即氟甲喹、恩诺沙星和环丙沙星）在中性pH条件下可被FeS有效吸附和降解。电子顺磁共振分析（EPR）结果和自由基淬灭实验表明，羟基自由基和超氧阴离子自由基是导致FQs降解的主要活性物种。基于产物分析和理论计算结果，FQs的降解主要发生在哌嗪环和喹诺酮结构上。我们的结果表明，FeS可以有效去除FQs，这有助于理解沉积物中抗生素的转化，甚至为受有机污染物污染土壤的修复提供思路。
