表面分散型金属氧化物/钛酸纳米片异质结原位构筑及可见光催化性能研究

The heterojunction photocatalysts can effectively overcome some of the limitations of the single-phase semiconductor photocatalysts, such as light response and charge separation, and show promising applications in photocatalysis. The structure and property of the surface/interface of heterojunctions play a critical role in the separation and transport of photogenerated carriers. Thus, control of the surface/interface of heterojunctions can greatly promote the separation and migration of photogenerated electron-hole pairs and is advantageous to further improve the photocatalytic performance of heterojunction catalysts. Based on the previous work, the project intends to design and synthesize surface-dispersed metal oxide/titanate nanosheets heterojunction with higher visible-light photocatalytic activity, and study their photocatalytic performance systematically. By controlling the kind and amount of metal oxides (rare earth oxides, transition metal oxides or compound oxide based thereon), the reaction conditions (i.e. the variety and dosage of transition metal ion, the type of the titanium source, the variety and concentration of alkali solution, reaction temperature, reaction time, etc.) in situ hydrothermal treatment, it will realize the adjustment and control of types, surface and interfacial microstructures of titanate nanosheets heterojunction. We will also study the structure-activity relationship between the structure characteristics and the photoelectric properties (the sensitivity to visible light，the generation and separation efficiency of the carriers) as well as the photocatalytic activity, and systematically clarify the mechanism of the enhancement on visible-light photocatalytic performance. It will provide a theoretical and technical support for the design and application of excellent photocatalysis materials.

异质结光催化剂能够有效改善单相半导体光催化剂光响应能力差、量子效率低等的缺陷，在光催化领域展现出广阔的应用前景。其中光生电子-空穴对在异质结界面处能够顺利地迁移和分离，是构筑高效的异质结光催化剂的前提，因此对于异质结的表/界面结构进行合理而有效的调控有利于其光催化性能的进一步提升。本项目拟在前期工作的基础上，系统开展具有高可见光催化活性的表面分散型金属氧化物/钛酸纳米片异质结催化剂的理论设计、实验合成及催化性能研究。通过改变金属氧化物的种类（稀土氧化物、过渡金属氧化物或基于它们的复合氧化物）、用量和反应条件（温度、时间、碱液浓度等），来实现钛酸纳米片层异质结的结构调控，有效拓宽可见光响应频率范围并提高光生电子-空穴对分离效率，系统探讨表面分散型异质结的原位构筑机制和可见光催化性能增强机理，从而为高性能光催化材料的设计与应用提供理论基础和技术支持。

异质结光催化剂能够有效改善单相半导体光催化剂光响应能力差、量子效率低等的缺陷，在光催化领域展现出广阔的应用前景。其中光生电子-空穴对在异质结界面处能够顺利地迁移和分离，是构筑高效的异质结光催化剂的前提，因此对于异质结的表/界面结构进行合理而有效的调控有利于其光催化性能的进一步提升。本项目在前期工作的基础上，系统开展了具有高可见光催化活性的表面分散型金属氧化物/钛酸纳米片异质结催化剂的理论设计、实验合成及催化性能研究。通过改变金属氧化物的种类（稀土氧化物、过渡金属氧化物或基于它们的复合氧化物）、用量和反应条件（温度、时间、碱液浓度等），实现了钛酸纳米片层异质结的结构调控，有效拓宽了可见光响应频率范围并提高光生电子-空穴对分离效率，系统探讨了表面分散型异质结的原位构筑机制和可见光催化性能增强机理，从而为高性能光催化材料的设计与应用提供了理论基础和技术支持。