金属复合氧化物单分散纳米晶的合成及性能研究

项目名称： 金属复合氧化物单分散纳米晶的合成及性能研究

项目编号： No.20801058

项目类型： 青年科学基金项目

立项/批准年度： 2009

项目学科： 环境科学、安全科学

项目作者： 刘军枫

作者单位： 北京化工大学

项目金额： 18万元

中文摘要： 以半导体材料做为催化剂的太阳能光电化学转换技术的开发和利用是解决世界能源和环境问题的重要途径。单分散纳米晶由于具有规则形貌、均一尺寸及特定的表面结构对于开展光催化基础研究、设计开发具有高催化活性新材料以及组装新型光电化学转换器件具有重要的科学意义。课题组围绕金属氧化物及复合氧化物单分散纳米晶的合成、组装及其在可见光光催化领域的应用展开工作。通过对多元金属氧化物体系合成工艺的优化，制备不同形状、不同尺寸的TiO2、CeVO4、BiVO4 等金属复合氧化物单分散纳米晶，研究了材料形貌与其光催化活性的关系；通过EBS微乳法将两种单分散纳米晶组装成二元胶体球，并通过后续煅烧合成介孔复合微球。通过二元组分的选择与调节，对材料的光催化性能进行调控。获得的Au/TiO2、C/TiO2介孔结构光催化剂具有优异的可见光光活性，有望得到实际应用。

中文关键词： 单分散纳米晶；金属氧化物；组装；光催化

英文摘要： Semiconductor photocatalysis is an efficient method for the chemical conversion and utilization of solar energy. It is regarded as a potential solution for world's energy shortages and environment crises. Monodispersed nanocrystals with uniform size, shape and well defined crystal surfaces have exhibited promising applications in design of novel photocatalyst with high catalytic activity, also are of great importance in the fundamental research of photocatalysis. Our research focuses on the studies of functional complex metal oxide, regarding the synthesis, assembly and applications in visible light photo-catalysis. With optimization of the synthesis process, monodispersed metal oxide and complex metal oxide nanocrystals, such as TiO2、CeVO4、BiVO4, with controlled size and morphology were fabricated. The relationship between photocatalytic activities and size/morphology of nanomaterials was investigated. The photocatalytic performance of above metal oxides was further improved by forming binary co-catalytic system assembled with monodispersed noble metals like Au through an EBS approach. The obtained Au/TiO2、C/TiO2 nanocomposites exhibit enhanced photocatalytic properties, and was expected to be good candidates in real photocatalytic applications.

英文关键词： monodisperse nanocrystal; metal oxide; assembly; photocatalysis