不同形貌C3N4/C-Dots高效光催化材料的制备及其光催化降解典型PPCPs的机制研究

C3N4是一种新型的可见光光催化剂，可吸收波长小于460 nm的光；C-Dots是新近发现的对光具有上转换功能的物质，能将500-1000nm的长波光转换为325-425nm的短波光。本项目拟利用C-Dots对C3N4进行改性，制备在紫外、可见、近红外光下均具有活性，可高效利用太阳能的C3N4/C-Dots系列光催化材料，并对其催化机理进行研究。研究内容包括：通过研究“制备条件-催化剂微观结构-催化活性”之间的内在联系，建立起催化剂制备时工艺条件优化的调控理论，并制备具有不同形貌的C3N4/C-Dots光催化剂；通过研究催化剂活性与光源波长的对应关系、目标物在催化剂表面的吸附与降解行为，以及体系中各种自由基的稳态浓度，揭示C3N4/C-Dots的光催化机理；通过研究PPCPs在C3N4/C-Dots作用下催化降解时，各种自由基的贡献率及相应的降解产物，剖析典型PPCPs降解机制及降解途径.

C3N4 is a novel visible light photocatalyst that its light absorption range is less than 460 nm. C-Dots is a newly discovered material with upconverted function on light, which can be excited by long-wavelength light (from 500 to 1000 nm) with the upconverted emissions located in the range from 325 to 425 nm. This project intends to modify C3N4 using C-Dots. The nano-photocatalytic material will be prepared, which will have high efficient utilization of solar energy containing the ultraviolet light, visible light and near-infrared light. Then the photocatalytic mechanism will be studied. The research contents include setting up a control theory for optimized process conditions of the preparation of different morphologies of C3N4/C-Dots through analyzing the relations among the preparation condition, catalyst microstructure and catalytic activity; revealing the photocatalytic mechanism of C3N4/C-Dots through studying the correspondences of catalyst activities and the waveleng of the light source, adsorption and degradation behaviors in the catalyst surface and steady-state concentration of different active free radicals in the system; elucidating the degradation mechanism and pathways of typical PPCPs through studying the contribution rate of various free radicals and the corresponding degradation products via the catalysis of C3N4/C-Dots.