熔盐介质中构建高结晶度多孔铋系光催化剂及光生电荷行为研究

The development of photocatalysts responded to visible light is of importance for organic pollutant degradation by using solar energy. In our strategy, molten salt method for the targeted synthesis of Bismuth photocatalysts will be developed to resolve the coflict between high crystallinity and porous structure. The reason of chosing molten salt is mainly due to its superior advantages in ion transportation promoting and confinement effect. Combined modelling with experimental design, the process of solutes reaction, nucleating and growing of photocatalyst with different morphology and structure will be clarified. Study of the relationship between intrinsic factors (morphology, crystal structure, electronic structure, photo-induced charges behaviour) and photocatalytic properties will also be carried out through the combination of theoretical and experimental methods. Morphology evolution mechanism, exposed facet, surface structure and composition will be investigated by means of XPS, TEM, EELS and theoretical simulation. Photocatalytic degradation mechanism and photodegradation kinetics will be determined by EPR, HPLC-MS, etc. Process of generation, transportation and combination of photo-induced charges will be clarified by means of SPV, PL. This project will be aimed at clarifying the law of Bismuth photocatalysts constructing in molten salt. The relationship model between structure and properties will also be studied to provide theoretical and experimental basis for the development of efficient photocatalysts.

开发可见光响应光催化剂对利用太阳能进行有机污染物处理有重要意义。本课题拟利用熔盐介质对离子迁移速率的增强效应及熔体的限域作用解决高结晶度与多孔结构之间的矛盾，设计制备铋系光催化材料。通过熔盐介质模型的建立与实验设计相结合的手段阐明熔盐体系中溶质的反应过程及晶体的成核、生长机制，研究不同结构及形貌的形成机制并实现可控制备。通过理论与实验相结合的方式研究光催化剂微观形貌、晶体结构、电子结构等与光生电荷行为及光催化性能之间的关系。采用XPS、TEM、EELS、理论模拟等手段研究光催化剂的形貌演变机制、暴露晶面、表面结构及组成；利用EPR、HPLC-MS等确定光降解机制及动力学过程；利用SPV、PL等明确光生电荷的产生、迁移、复合过程。旨在阐明高结晶度多孔铋系光催化剂在熔盐中的构建规律及结构-性能关系模型，为高效光催化剂的开发提供理论与实验依据。

开发可见光响应光催化剂对利用太阳能进行有机污染物处理有重要意义。本课题拟利用熔盐介质、高压电场等对离子迁移速率的增强效应及限域作用解决高结晶度与多孔结构之间的矛盾，设计制备铋系光催化材料。通过模型的建立与实验设计相结合的手段阐明熔盐体系中溶质的反应过程及晶体的成核、生长机制，研究不同结构及形貌的形成机制并实现可控制备。通过理论与实验相结合的方式研究光催化剂微观形貌、晶体结构、电子结构等与光生电荷行为及光催化性能之间的关系。采用XPS、TEM、EELS、理论模拟等手段研究光催化剂的形貌演变机制、暴露晶面、表面结构及组成；利用EPR、HPLC-MS等确定光降解机制及动力学过程；利用SPV、PL等明确光生电荷的产生、迁移、复合过程。旨在阐明高结晶度多孔光催化剂在构建规律及结构-性能关系模型，为高效光催化剂的开发提供理论与实验依据