化学学报 ›› 2002, Vol. 60 ›› Issue (9): 1596-1600. 上一篇    下一篇

研究论文

表面功能化的介孔分子筛SBA-3的表征

贾雪平;杨春   

  1. 南京师范大学化学与环境科学学院,南京(210097)
  • 出版日期:2002-09-15 发布日期:2002-09-15

Characterization of Surface Functionalised Mesoporous Molecular Sieve SBA-3

Jia Xueping;Yang Chun   

  1. College of Chemistry and Environmental Science, Nanjing Normal University,Nanjing(210097)
  • Online:2002-09-15 Published:2002-09-15

采用γ-氨丙基三乙氧基硅烷(AM),通过表面硅烷化反应,对脱模板后的纯 硅六方介孔分子筛SBA-3进行了表面功能化,并通过XRD,TEM,低温N_2吸附, FTIR和吸附染料分子的UV-vis漫反射光谱等对功能化样品的结构、孔性质和表面极 性等进行了详细表征。结果表明,功能分子锚接后,样品的六方结构基本保持。样 品的表面硅羟基由于被消耗而明显减少,导致表面极性降低。另外,由于功能分子 占据了部分孔道空间,样品的孔容、表面积和孔径下降。

关键词: 分子筛, 硅烷 P, 吸附, 表面积, 孔径

The functionalised mesoporous molecular sieves were prepared by using 3-aminopropyltriethoxysilane (AM) to react with calcined pure siliceous SBA-3. By means of XRD, TEM, N_2 adsorption-desorption isotherms, FT-IR and UV-vis diffuse reflectance spectroscopy of adsorbed Relchardt's dye, the structure, the pore properties and the polarity on surface of the functionalised samples were characterized. It is shown that the hexagonal structural character is mostly retained after the functionalization. The population of silanol groups on the surface greatly decreases due to being consumed in the reaction with organosilane, resulting in a reduction in surface polarity. In addition, the pore volumes, surface areas and pore diameters of the functionalised samples decrease since the space within channels are partially occupied by the functional molecules.

Key words: MOLECULAR SIEVE, SILANE P, ADSORPTION, SURFACE AREA, PORE SIZE

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