铁掺杂生物炭介导的生物阴极去除河湖底泥中抗生素的机制研究

抗生素污染物因不易被生物降解和易诱导产生抗性基因，对环境生态和人类健康存在潜在危害。近年来，生物电化学技术因具有环境友好和能耗低等特点，在难降解有机污染物原位修复等方面具有广阔的应用前景。目前铁/碳基复合材料强化生物阴极降解河湖底泥中抗生素的研究尚少。并且生物电化学系统对底泥中抗生素的去除作用机理还未阐明。本项目拟优化制备铁掺杂生物炭介导的生物阴极，并用于缓解洞庭湖底泥中典型抗生素对环境的污染，在此基础上揭示生物阴极去除河湖底泥中抗生素及其中间产物的行为与机理。考察施加电压和环境等因素对抗生素强化降解效果的影响，分析该生物电化学体系中抗生素降解路径及转化过程机理，揭示实际修复过程中抗生素的迁移转化规律；综合评价生物阴极修复抗生素污染河湖底泥后的毒性以及该方法的实际应用可行性，本项目将为水-固相环境介质如河湖底泥中抗生素的控制与原位修复提供理论指导和技术支撑。

Antibiotic pollutants possess potential risks to environmental ecology and human health because they are hard to be biodegraded and easy to induce resistance genes. Recently, Bioelectrochemical technology exhibits wide prospects applied in remediation of refractory organic pollutants and resource utilization of wastes due to its environmental friendliness and low energy consumption. So far, Limited study focuses on the iron/carbon composites to enhance the degradation of antibiotics in river and lake sediments by biocathodes. In addition, the mechanism of the removal of antibiotics in bioelectrochemical systems is still unclear. This project amis at optimizing the iron-doped biochar mediated biocathodes to alleviate the contamination status of Dongting Lake sediments by representative antibiotics. Besides, the behavior and mechanism of biocathodes removing the antibiotics and its intermediate products will be revealed. The effects of applied voltage and environmental parameters on the performance will be explored. The transformation mechanism of antibiotics degraded in the bioelectrochemical systems will be also analyzed. This will clarify the migration and transformation pattern of antibiotics in the practical remediation process. In addition, the project will explore the intermediate toxicity and comprehensively evaluate the feasibility of this method to remove antibiotics in river and lake sediments. This project will provide theoretical guidance and technical support for the control and in situ remediation of antibiotics in water-solid environment media such as rive and lake sediments.