NHCS多相光电催化粒子电极的制备及去除六价铬/环境内分泌干扰物复合污染的协同机制研究

Nowadays, the mixture of heavy metal and endocrine disrupting chemicals （EDCs）is becoming increasingly serious and has begun to threaten the safety of water bodies and human health, which is an urgent problem should be solved. In this project, hexavalent chromium (Cr(VI)) and EDCs mixed wastewater is planning to be the study object. We will synthesize the metal oxygen (sulfur) and conductive polymer covered nano hollow carbon sphere (NHCS) heterojunction materials and explore the synergistic degradation mechanism for removal of mixed wastewater by a three-dimensional photoelectrocatalytic system. The microstructure, chemical composition and properties of the photoelectrocatalyst materials were characterized. Further, the properties of photoelectrocatalyst materials, including adsorption behavior and photoelectrocatalytic activity will be comprehensively studied for elucidating the intrinsic mechanism of photoelectrocatalytic degradation of Cr(VI)/EDCs. The photoelectrocatalytic mechanism will be elucidated by combining the free radicals, the intermediate products, the dynamically degrade process in solid-solution interface, the degradation dynamics and the transient change of photoelectrocatalyst and “waste controlled by waste” repair route. Finally, the reduction of Cr(VI) and rapid degradation of EDCs will be realized. This research will provide the theory basis and practicable methods for mixed pollutants control.

当前重金属和环境内分泌干扰物混合污染日益严重，已严重威胁水体安全及人类健康，是亟待解决的环境问题。本文拟以代表性的六价铬和内分泌干扰物混合废水为研究对象，制备以纳米中空碳球（NHCS）为基底，金属氧（硫）化物和导电聚合物修饰NHCS的多相光电催化粒子电极，开展三维光电催化体系去除混合废水的协同增效机制研究。表征该类光电催化材料的微观结构、化学组成及性质的变化；研究光电催化剂对混合污染物的吸附分配与光电催化降解特性，结合混合污染物降解动力学、光电催化剂变化的瞬态过程及混合污染物在固-液微界面转化的动态过程、“以废制废”的修复途径, 阐明光电催化降解混合污染物的内在机理及协同作用机制，实现六价铬的还原和内分泌干扰物的快速降解，为高效处理混合废水提供理论依据与实践方法。

从探索光电催化材料的可控制备-微观结构-性能三者的内在关系角度出发，以纳米中空碳球（NHCS）为基底，金属氧（硫）化物和导电聚合物修饰NHCS的多相光电催化粒子电极，在实验上建立高效、可循环利用、在光电催化方面具有应用前景的复合催化剂。主要有（a）通过对组装结构界面性能的改性和调控原理进行探究，揭示复合材料的化学组成和微观结构对材料的电催化活性、光响应性能、物化吸附性能、载流子迁移分离的影响机理和规律；（b）针对光电催化剂表面发生的吸附-光电催化-解吸附循环过程进行研究，模拟降解体系中反应瞬态过程，分析催化剂表面及固液界面的变化，活性物质的产生与作用机理，复合材料组分配比与催化性能的构效关系，阐明光-电协同催化的作用机制。（c）研究混合污染物浓度配比与催化效率间的关系，探讨污染物的迁移转化规律，分析混合污染物在光电催化体系中的氧化还原机制，揭示内分泌干扰物与重金属离子间的协同去除机理，为光电催化降解混合废水提供理论支撑。