光/暗反应协同增强氮化碳光催化还原不饱和有机分子的作用机制研究

半导体光催化不饱和有机分子的还原在高附加值精细化学品合成中具有重要的应用前景，然而目前这类反应存在量子效率低、反应选择性较差、应用范围受限等问题，严重限制了该过程的大规模应用。针对以上问题，基于生物光合作用原理，本项目拟设计构造具有电荷储存性能的氮化碳光催化剂，并研究光激发与暗反应协同增强的氮化碳光催化不饱和有机分子还原反应的作用机制。优化催化剂的组成、形貌、结晶度、缺陷、能带结构等，促进电荷富集与存储，减少光生载流子复合；调控电荷存储容量与寿命，改善表界面电荷迁移，实现光催化有机反应产物的精准控制。研究这类光催化剂在复杂有机物以及药物分子等方面的催化性能，为氮化碳光催化选择性有机还原反应的规模化生产提供理论指导和实验依据。

Photocatalytic technology has great promise in the synthesis of high value-added fine chemicals, which could address the issue of energy shortage and environmental pollution. In recent years, considerable attention has been paid to photocatalytic reduction of unsaturated organic compounds. However, due to the low quantum efficiency, poor selectivity, and narrow scope, practical large-scale application of this process is severely limited. Based on the principle of biological photosynthesis, this project intends to design and construct one polymeric carbon nitride photocatalyst with energy storage property, which could generate a synergetic photoexcitation and chemical reaction process. After that, their performance in photocatalytic selective reduction reaction will be studied. The project will investigate several parameters that influencing the activity of the photocatalyst, such as the composition, morphology, crystallinity, defect and electronic structure. It’s anticipated that the recombination of photogenerated charge carrier will be reduced and the charge storage capacity be promoted. The capacity and lifetime of the stored charge and the interfacial migration of photogenerated charge carriers will be modulated to achieve precise regulation of the photocatalytic reaction products. The study on the photocatalytic reduction of complex organic compounds and drug molecules will also be conducted. This research is anticipated to develop a highly efficient and selective photocatalyst for the reduction of unsaturated organic compounds, which will provide a theoretical and experimental basis for further large scale preparation of high value-added chemicals.