多层状化合物Bi3PbWO8X (X = Cl、Br、I)制备及可见光光催化活性研究

The bismuth oxide layer compounds are the recently discovered photocatalyst. Compared with titanium dioxide, Bismuth oxygen halide layer compounds have excellent photocatalytic activity, however, its wider band gap limits the application in visible light region. Recently, in order to narrow the band gap and enhance the visible light photocatalytic activity, we incorporated Pb2+ into [Bi2O2] layers based on the structure of BiOCl to form BiPbO2Cl. Our project intend to prepare high visible light photocatalyst, and research the effect of growth conditions, multilayer structure, and oxygen deficiency on the visible light photocatalytic activity. The multilayer compounds Bi3PbWO8X (X = Cl、Br、I) were prepared by solvothermal and solid phase reaction method. The growth conditions, multilayer structure, the oxygen defects will be systematically studied. In order to obtain a catalyst with high visible photocatalytic activity, we should In-depth understand the origin of the Bi-based oxide photocatalytic activity and explore novel physical and chemical phenomena caused by multi-layered structure.

铋氧基层状化合物是近年来发现的重要的光催化剂。相对于二氧化钛，铋氧卤层状化合物具有优异的光催化活性，但其带隙较宽限制了在可见光区的应用。最近，我们采用铅离子插入铋氧层有效降低了其带隙，其可见光光催化活性得到了较大的提高。本项目以制备高活性的可见光光催化剂、研究多层状结构和氧缺陷对可见光光催化活性的影响为目标。利用溶剂热和固相反应法制备Bi3PbWO8X (X = Cl、Br、I)多层状化合物，系统研究生长条件、多层状结构、氧缺陷等对物性的影响规律，深入认识铋基氧化物光催化活性的起源，探索多层状结构引起的新颖物理化学现象，获得高可见光光催化活性的催化剂。

项目执行期间通过水热法制备BiPbO2Cl纳米片及其复合材料；研究不同条件下制备的BiPbO2Cl纳米片与石墨烯复合材料的形貌、结构、比表面积、表面性质、光学性质和光催化性能；利用固相反应法制备BiLa1.4Ca0.6O4.2化合物，系统研究生长条件、氧缺陷等对物性的影响规律，深入认识铋基氧化物光催化活性的起源；研究了激光退火处理对光电催化材料的晶体结构、微观形貌、光电催化性能的影响，揭示了激光退火处理与光电催化性能之间的内在联系。多篇研究论文发表在多种国内外权威刊物上，发表SCI 收录论文15篇， 其中ESI高被引论文3篇，ESI热点论文2篇。 获得了国家发明专利2项。项目执行期间共毕业了15位大学生。建立了较为广泛的国际学术交流与合作关系。