基于铁卟啉衍生的多级孔Fe-N-C阴极/电芬顿体系用于河流水体中PAEs污染修复的行为机理研究

湘江流域工农业发达且水体环境复杂，水体中邻苯二甲酸酯（PAEs）污染会威胁水生态环境和人类健康。非均相电芬顿技术是一种能有效用于水体中PAEs污染修复的环境友好型方法，但催化效率受阴极对氧气利用率低、Fe(II)再生效率低的限制，影响了其在实际复杂环境条件下的修复效果。因此，本项目针对湘江流域PAEs污染关键问题，拟制备铁卟啉衍生的多级孔Fe-N-C材料作为阴极构建非均相电芬顿体系用于湘江水体中PAEs污染修复。优化阴极关键制备参数，采用单因素实验优化应用过程，探知PAEs的去除效能；采用现代化表征手段结合单因素实验结果，探求体系对PAEs的去除机制及中间产物演变规律；考察关键环境因子对PAEs降解效能的影响，分析降解过程中间产物的毒性演变规律，综合评价修复水体进一步利用的安全性和可行性。以期为发展新型催化剂构建的电芬顿体系安全高效用于PAEs污染河流水体修复提供重要的理论依据和技术支撑。

The industry and agriculture in Xiangjiang River Valley developed very fast, which makes the complex water environment. And the pollution of phthalate esters (PAEs) in Xiangjiang River possesses a threat to water ecological environment and human health. The heterogeneous electro-Fenton technique is an environmentally friendly method that can be used for the remediation of PAEs from river water. However, the catalytic efficiency is limited by the low oxygen utilization of cathode and low Fe(II) regeneration efficiency, which affects the remediation performance under complex conditions. Concerning on the key problems of PAEs pollution, in this project, a ferriporphyrin-derived hierarchical porous Fe-N-C catalyst will be prepared as cathode material and used to structure a heterogeneous electro-Fenton system for the removal of PAEs from Xiangjiang River. Firstly, the key preparation parameters of Fe-N-C catalyst will be optimized, and the single factor experiment will be carried out to optimize the application process and further ascertain the removal efficiency of PAEs. Secondly, the mechanism and intermediates of PAEs degradation will be investigated by the combination of some characterization techniques and single factor experiment results. Besides, the effects on the degradation efficiency by key environmental factors and the toxic effects on degradation intermediates to microbes and plants will be also studied to comprehensively evaluate the security and feasibility for further utilization of river water after remediation. This project is expected to provide important theoretical basis and technical support for the development of new catalyst-based electro-Fenton oxidation system and its safe and efficient remediation of PAEs polluted river water.