原子级厚度卤氧化铋二维晶体的制备及其可见光催化治理南水北调水源基础研究

Photon absorption efficiency and carrier separation efficiency are the two most important problems for semiconductor photocatalyst. This project can enhance the defect concentration and internal electric field intensity by reducing the thickness of BiOX (X = Cl, Br, I) nanosheets to nanometer scale. So, the self absorption efficiency and carrier separation efficiency of BiOX photocatalysts could be enhanced, and the visible light photocatalytic properties of BiOX photocatalysts also could be improved. Dethylhexyl phthalate (DHHP, a potential endocrine disruptors) and Cr(Ⅵ) are the main pollutant of the South-to-North Water Diversion Project in Danjiangkou reservoir. This project will study the photocatalytic degradation activity and mechanism of DHHP and Cr(Ⅵ) using atomic thickness BiOX nanosheets. It can give the direct guidance for water treatment of South-to-North Water Diversion Project.

光子吸收效率和载流子分离效率是半导体光催化剂面临的二大核心问题。本项目通过卤氧化铋纳米片厚度超薄化，同时提高其自身缺陷浓度和内电场强度，从而分别增强卤氧化铋系列光催化剂自身的光子吸收效率和载流子分离效率的目的，进而提高卤氧化铋的可见光催化性能。增塑剂邻苯二甲酸二辛酯（一种潜在的内分泌干扰物）和六价铬离子是南水北调中线工程水源丹江口水库中的主要污染物。本项目拟使用原子级厚度卤氧化铋纳米片为光催化剂，研究光催化降解邻苯二甲酸二辛酯和六价铬离子的活性和机理，为南水北调工程水源治理起到了直接的指导作用。

光子吸收效率和载流子分离效率是半导体光催化剂面临的二大核心问题。本项目通过卤氧化铋纳米片厚度超薄化，同时提高其自身缺陷浓度和内电场强度，从而分别增强卤氧化铋系列光催化剂自身的光子吸收效率和载流子分离效率的目的，进而提高卤氧化铋的可见光催化性能。六价铬离子、有机染料、细菌是南水北调中线工程水源区的主要潜在污染物。本项目成功合成原子级厚度卤氧化铋纳米片光催化剂，研究光催化处理六价铬离子、有机染料、细菌的活性和机理，为南水北调工程水源治理起到了直接的指导作用。此外，作为拓展应用，我们对合成的卤氧化铋超薄纳米片也进行了光催化CO2转化、光催化固N2、光催化分子氧活化方面的研究，都表现出很高的活性。