Ag/SBA-15表面催化过程的现场SERS研究  

In Situ SERS Studies of Catalytic Processes on Ag/SBA-15

作　　者：蒋丽[1] 刘伟[1] 姚建林[1] 陈彪[1] 顾仁敖[1] 

机构地区：[1]苏州大学材料与化学化工学部,苏州215123

出　　处：《化学学报》2011年第20期2368-2372,共5页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos.20973120;21073128)资助项目

摘　　要：以三嵌段共聚物P123为模板剂,正硅酸乙酯为硅源,水热合成了介孔分子筛SBA-15,通过对SBA-15内外表面修饰,使用银氨溶液和硝酸银溶液作为金属源合成Ag/SBA-15,透射电镜(TEM)研究表明在SBA-15孔道内较好地分散了颗粒状和棒状的Ag纳米粒子.以苯硫酚作为探针分子,研究了负载Ag纳米粒子的SBA-15的SERS效应,结果表明Ag/SBA-15具有良好的SERS活性.另外,该材料对催化硼氢化钠还原对硝基苯酚具有良好的催化效果,通过结合现场SERS技术,研究了该催化过程的机理.Mesoporous molecular sieves SBA-15 were synthesized by conventional hydrothermal process using tetraethylorthosilicate（TEOS） as silicon source and triblock copolymer P123 as template.Ag/SBA-15 was fabricated in AgNO3 or [Ag（NH3）2]NO3 solutions as the metal source after the inner and outer wall of SBA-15 were modified with functional molecules.The morphology of synthesized composite was charac-terized by transmission electron microscopy（TEM）.The results showed that monodisperse Ag nanoparticles and nanorods were formed in the channel of SBA-15 respectively.Reasonable surface enhanced Raman scattering（SERS） activities of Ag/SBA-15 composite were observed by using thiophenol（TP） as the probe molecules.Besides,the Ag/SBA-15 composite exhibited high catalytic activities for the reduction of p-nitrophenol in the presence of NaBH4.By using the real time SERS measurements,the mechanism of the catalytic reduction of p-nitrophenol was proposed.

关 键 词：介孔分子筛SBA-15 AG 表面增强拉曼光谱(SERS) 催化机理 

分 类 号：O643.36[理学—物理化学]