改性贝壳粉/Ce-N-TiO2吸附与光催化降解典型溶解态有机磷的作用机制研究

抑制溶解态有机磷（DOP）过量是控制湖泊富营养化的关键。目前，利用复合材料对DOP的吸附、光催化降解及协同效应等机制尚未得到系统研究。本项目拟研发高效低耗的改性贝壳粉/Ce-N-TiO2新型复合光催化剂，并赋予其物理吸附与可见光光催化降解性能，建立针对典型DOP（植酸和草甘膦）的吸附与光催化降解协同去除方法，从微观尺度研究其吸附典型DOP过程中的构效关系及相互作用机制，提高其吸附容量，阐明其对典型DOP吸附/解吸性能及机理；明确改性贝壳粉/Ce-N-TiO2对典型DOP光催化降解路径及机理；探究其对典型DOP吸附与光催化降解协同效应；明晰其释放新吸附位点后促进新一轮吸附与光催化降解的物料平衡机制；揭示其吸附典型DOP后的释放规律及再生性能。本研究不仅为高吸附容量的复合光催化剂结构设计、化学修饰和性能优化提供新策略，同时为降低湖泊富营养化程度、保护生态环境提供新的理论依据和技术借鉴。

Suppressing excessive dissolved organic phosphorus (DOP) is the key to control lake eutrophication. At present, the mechanism of adsorption, photocatalytic degradation and their synergistic effect on DOP using composite materials has not been systematically investigated. This project intends to develop a novel composite photocatalyst named modified shell powder/Ce-N-TiO2 with high-efficiency and low-consumption characteristics, which has physical adsorption and visible light photocatalytic degradation performance. A synergistic removal of adsorption and photocatalytic degradation for DOP (i.e., phytic acid and glyphosate) will be established. The structure-activity relationship and interaction mechanism during typical adsorption of DOP will be studied form the micro scale to improve its adsorption capacity, and clarify the adsorption/desorption mechanism of DOP. The photocatalytic degradation pathway of DOP using modified shell powder/ Ce-N-TiO2 and the corresponding mechanism will be determined. The material balance relationship of the new round of adsorption and photocatalytic degradation after releasing new adsorption sites will be evaluated. The releasing mechanism and regeneration performance after DOP adsorption will be revealed. The present project not only provides new strategies for the structural design, chemical modification and performance optimization of composite photocatalysts with high adsorption capacity, but also provides new theoretical basis and technical reference for relieving the eutrophication of lakes and protecting the ecological environment.