Synthesis and Characterization ofMesoporous Silicas with Carboxylic and Amine Functionality

• Main Authors: Chung-Ta Tsai, 蔡忠達
• Other Authors: Hsien-Ming Kao
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/30323151069493276675

碩士 === 國立中央大學 === 化學研究所 === 97 === Well-ordered mesoporous silicas SBA-15 functionalized with extremely high loadings of pendant carboxylic acid groups, up to 50 mol% of the silicon sites without degradation of ordered structures, have been successfully synthesized via co-condensation of tetraethoxysilane (TEOS) and carboxyethylsilanetriol sodium salt (CES) templated with a triblock polymer Pluronic P123 under acidic conditions. On the other hand, well-ordered cubic mesoporous silicas SBA-1 functionalized with carboxylic and amino functional groups have been successfully synthesized via the co-condensation of 3-(Triethoxysilyl)-Propionitrile (CNTES) , tetramethoxysilane (TMOS) and (3-Aminopropyl)-trimethoxysilane (APTMS) templated by cetyltriethylammonium bromide (CTEABr) under strongly acidic conditions. In order to optimize the degree of the structural ordering of the bifunctional mesoporous silicas SBA-1, a wide range of synthesis conditions such as synthesis temperature, loading of functional groups, hydrothermal periods, and acid concentrations was systematically investigated. The materials obtained were characterized by a variety of techniques including powder X-ray diffraction (XRD), nitrogen sorption measurements , 13C and 29Si magic angle spinning (MAS), IR, transmission electron microscope (TEM) and thermogravimetric analysis (TGA).