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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (20): 2368-2372. 上一篇    下一篇

研究论文

Ag/SBA-15表面催化过程的现场SERS研究

蒋丽，刘伟，姚建林*，陈彪，顾仁敖*   

  1. (苏州大学材料与化学化工学部 苏州 215123)
  • 投稿日期:2011-01-31 修回日期:2011-05-18 发布日期:2011-06-20
  • 通讯作者: 姚建林 E-mail:jlyao@suda.edu.cn
  • 基金资助:

    略

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

JIANG Li, LIU Wei, YAO Jian-Lin, CHEN Biao, GU Ren-Ao   

  1. (College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123)
  • Received:2011-01-31 Revised:2011-05-18 Published:2011-06-20
  • Contact: Jianlin Yao E-mail:jlyao@suda.edu.cn

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被引次数

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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.

关键词: 介孔分子筛SBA-15, Ag, 表面增强拉曼光谱(SERS), 催化机理

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 characterized 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.

Key words: mesoporous molecular sieve SBA-15, silver, surface enhanced Raman spectroscopy (SERS), catalytic mechanism