多金属氧酸盐/贵金属复合微纳米材料的合成及其光催化性能研究

项目名称： 多金属氧酸盐/贵金属复合微纳米材料的合成及其光催化性能研究

项目编号： No.21301166

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 谭华桥

作者单位： 中国科学院长春光学精密机械与物理研究所

项目金额： 24万元

中文摘要： 光催化技术作为一种解决人类能源和环境问题最具希望的有效途径，其开发和应用迫在眉睫。寻找、设计并制备高量子效率光催化剂是当前光催化技术发展的关键。本项目选择结构稳定并具有可调的能带结构和可逆氧化还原性的多金属氧酸盐（简称多酸）和贵金属纳米材料为研究对象，力图构筑一类新型多金属氧酸盐/贵金属复合微纳米光催化材料。一方面利用多金属氧酸盐可逆的氧化还原性和电负性，合成并稳定贵金属纳米粒子，从而简便、可控地解决贵金属纳米材料负载时粒径大、尺寸分布宽、易团聚等难题；另一方面，利用贵金属纳米粒子在多酸表面的Plasmon和异质结效应，解决多酸光谱响应范围窄、电荷迁移率低、光生电子与空穴易快速复合等制约多酸光催化应用的关键性问题，从而获得宽光谱响应高光催化效率的多酸/贵金属复合光催化剂。总结复合材料的合成规律，探索不同组成、尺寸、形貌多酸/贵金属光催化剂在光解水或光降解染料、农残等有机污染物方面的应用。

中文关键词： 多酸；贵金属；半导体；光催化降解；产氢

英文摘要： Photocatalytic technology as one of the most effective and promising solution to the human energy and environment problem, its development and application is extremely urgent. Therefore, the design and synthesis of high quantum efficiency photocatalyst has became the key to the development of photocatalytic technology.In the project, we select polyoxometalates (which has the stable structure, a tunable band gap and reversible redox) and noble metal nanoparticles as the research object, and try to construct a new class of Polyoxometalate / noble metal composite micro-nano photocatalyst materials. On one hand, with the reversible redox and electronegativity of polyoxometalates, we can conveniently and controllably synthesize and stabilize the noble metal nanoparticles. And thus the problems, which encountered during loading noble metal nano materials, such as large particle size, wide size distribution and easy agglomeration, could be resolved. On the other hand, using the surface Plasmon and heterojunction effect of noble metal nano materials, the problems that polyoxometalates were solely used as photocatalysts could be overcomed, for example narrow spectral response, low charge transfer rate and photogenerated electrons and holes easy recombination. Therefore, we can obtained a new kind of polyoxometalate/noble

英文关键词： Polyoxometalate；Noble metal；Semiconductor；Photodegradation；Hydrogen production