将CO2和水高效地转换成为含碳化合物或氢是解决能源危机和环境问题的理想途径，而基于人工光合成或转化的技术被认为是一条重要的解决方案，其核心是高效光催化剂的开发。本项目在能带工程和固溶体理论的指导下，通过反应体系设计，以廉价的宽禁带和窄禁带的硫化合物半导体为基础，通过液相法制备具有组成可控、禁带宽度和能带结构可调节的、ZnS基（ZnS-CuFeS2，ZnS-AgFeS2等）和CuFeS2基（CuFeS2-CuAlS2，CuFeS2-AgAlS2等）I-III-VI2型多元硫化物固溶体纳米材料；研究反应体系对产物的形貌、组成及表面性质的影响规律，对高质量的多元硫化合物固溶体纳米晶的形成机理有一个深刻认识，发展一种普适性的制备技术或途径；以光解水制氢和光催化还原CO2为指针反应，研究固溶体的能带结构、结晶性、尺寸、形貌结构等对光催化性能的影响，为开发新型光催化剂或提高光催化效率提供实验依据。

Photocatalytic splitting of H2O into H2 and the reduction of CO2 for hydrocarbon fuels production by using solar energy is an attractive process to address both energy and environmental issues. Technology basing on artificial light synthesis or conversion is generally considered to be an important solution way. Many researches have been devoted to developing efficiently novel photocatalysts for these two reactions. Under the guidance of band-gap engineering and solid solution theory, this project is aiming to combine a semiconductor with a wide band gap and a semiconductor with a narrow band gap to form a series of composition- and band gap- tunable ZnS-based (such as ZnS-CuFeS2, ZnS-AgFeS2 etc.) and CuFeS2-based (such as CuFeS2-CuAlS2, CuFeS2-AgAlS2 etc) I-III-VI2 sulfide solid solutions via a liquid phase method, to study the relationship between the crystal structure, composition, surface properties and the reaction system, and to try to develop a profound understanding on the formation mechanism and a universal preparation approach of these solid solution photocatalysts. Basing on the photocatalytic water splitting and CO2 reduction, further researches will be focused on the relationship of solid solution between the bandgap structure, crystallinity, size, morphology and photocatalytical properties, and try to supply scientific evidences for developing novel photocatalysts or enhancing photocatalysis efficiency.