片状Bi4Ti3O12/TiO2异质结构材料的合成及其可见光催化机理

项目名称： 片状Bi4Ti3O12/TiO2异质结构材料的合成及其可见光催化机理

项目编号： No.51202156

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 无机非金属材料学科

项目作者： 赵巍

作者单位： 天津城建大学

项目金额： 25万元

中文摘要： 本项目采用熔盐法合成具有可控形貌、尺寸和织构的层状钙钛矿型微米级片状Bi4Ti3O12晶体，并以此为模板前驱体，通过水热或硫酸钛水解法使纳米TiO2 粒子沿模板前驱体表面均匀结晶生长，得到<001>方向织构化并具有异质结构的Bi4Ti3O12/TiO2复合材料；研究片状Bi4Ti3O12/TiO2界面处的物质结构及能级结构，探索铁电材料的光电转换机制，阐明复合材料异质结构的可见光催化机理，分析提高其光催化性能的主要因素。在上述理论研究的基础上，设计合理的界面结构，通过简单的制备工艺获得性能优异的微米/纳米异质结构材料体系，以亚甲基蓝为模拟污染物，短时间内的光降解效率优于商业化的P25 TiO2；完善铁电材料的光催化理论，建立铁电-光电动态转换模型；Bi4Ti3O12/TiO2异质结构材料结合了铁电材料与光电材料的优势，在建筑节能、污水处理等领域有较大意义和应用价值。

中文关键词： 钛酸铋/二氧化钛；片状；异质结构；可见光催化；铁电材料

英文摘要： Textured micron scale Bi4Ti3O12 platelets with layer-perovskite structure and controlled mophology and size are synthesized by molten salt method. Using the Bi4Ti3O12 precursor, Nano-sized TiO2 particles grow along the surface of Bi4Ti3O12 templates through hydrothermal treatment or hydrolysis of titanium sulfate, and then form &lt;001&gt; textured heterostructured Bi4Ti3O12/TiO2 composite. We begin with a survey of efforts to explore the energy band configuration of the Bi4Ti3O12/TiO2 composite, clarify the photocatalytic mechanism and analyze the influence factors to improve the photocatalytic activities. Based on the theoritical research above, we design the resonable interface to get the high property micro/nano sized material systerm through facile method. The photocatalytic activity of Bi4Ti3O12/TiO2 are measured with the photodegradation over methylene blue at room temperature under visible light irradation,the composite show good absorption in the visible region and the photodegradation against methylene blue should be better than the commercial TiO2(P25);Study the mechanism of the photocatalytic activity, build a model about the electricity transfermation between the ferroelectrics and the photocatalytic materials; The heterostructured Bi4Ti3O12/TiO2 composite combine the advantages of each of the end comp

英文关键词： Bi4Ti3O12/TiO2；platelet；heterostructure；visible-photocatalytic；ferroelectrics