高等学校化学学报 ›› 2010, Vol. 31 ›› Issue (12): 2482.

• 研究论文 • 上一篇    下一篇

苯基修饰的疏水微孔二氧化硅膜的制备与表征

李振杰,韦奇,魏娜娜,李群艳,聂祚仁   

  1. 北京工业大学材料科学与工程学院, 北京 100124
  • 收稿日期:2010-02-23 修回日期:2010-04-14 出版日期:2010-12-10 发布日期:2010-12-06
  • 通讯作者: 韦奇 E-mail:qiwei@bjut.edu.cn
  • 作者简介:韦奇, 男, 博士, 教授, 主要从事面向洁净能源应用的无机膜和多孔材料的研究.
  • 基金资助:

    国家“八六三”计划项目(批准号: 2009AA03Z213)、 国家自然科学基金(批准号: 50502002)和北京工业大学自然科学基础研究基金资助.

Preparation and Characterization of Hydrophobic Microporous Silica Membranes Modified by Phenyl Groups

LI Zhen-Jie, WEI Qi*, WEI Na-Na, LI Qun-Yan, NIE Zuo-Ren   

  1. Hubei Key Laboratory of Novel Reactor & Green Chemical Technology,  Wuhan Institute of Technology, Wuhan 430073, China
  • Received:2010-02-23 Revised:2010-04-14 Online:2010-12-10 Published:2010-12-06
  • Contact: WEI Qi E-mail:qiwei@bjut.edu.cn
  • About author:韦奇, 男, 博士, 教授, 主要从事面向洁净能源应用的无机膜和多孔材料的研究.
  • Supported by:

    National High Technology Research and Development Program of China (863 Program);National Natural Science Foundation of China

摘要: 采用苯基三乙氧基硅烷(PTES)和正硅酸乙酯(TEOS)作为前驱体,通过溶胶-凝胶法制备了苯基修饰的SiO2膜材料。利用扫描电镜、N2吸附、视频光学接触角测量仪、热重分析、红外光谱等测试手段对膜的孔结构以及疏水性能进行了表征,最后还研究了修饰后膜材料在室温条件下的单组份气体渗透和分离性能。结果表明,随着PTES加入量的增大,膜材料的疏水性逐渐增强,当PTES/TEOS和H2O/TEOS的化学计量比分别达到0.6和9.6时,膜材料对水的接触角达到115±0.5°,仍保持良好的微孔结构,其孔体积为0.17cm3/g,孔径为0.4-0.5nm。室温下氢气在修饰后SiO2膜的输运既遵循发生在微孔孔道的表面扩散机理也遵循发生在较大孔道或者微缺陷的努森扩散机理,膜材料的H2渗透率达到1.49×10-6mol?m-2?Pa-1?s-1,H2/CO2 和H2/SF6的理想分离系数分别达到4.64和365.59

关键词: 苯基, 微孔SiO2膜, 孔结构, 疏水性, H2渗透率

Abstract: Silica membranes modified with phenyl groups were synthesized through the acid-catalyzed co-hydrolysis and condensation reaction of tetraethyl orthosilicate(TEOS) and phenyltriethoxysilane(PTES). The pore structure and hydrophobic property of the modified silica membranes were characterized by SEM,means of nitrogen adsorption, water contact angle measurement, TG and FT-IR. The single gas permeation and permselectivity of the hydrophobic silica membranes were also investigated at room temperature. The results show that the hydrophobic property of the modified silica membranes has been gradually enhanced with increasing amount of PTES in the mixture. When the molar ratio of PTES/TEOS increases to 0.6 and H2O/TEOS to 9.6, the modified silica membranes exhibit an excellent hydrophobic property with a water contact angle of 115?0.5° and a desirable microporous structure with a pore volume of 0.17 cm3/g and a sharp pore size distribution centered at 0.4-0.5nm.The modified silica membranes conform to a combination of a surface diffusion mechanism associated with micropores and a Knudsen diffusion mechanism related to the larger pores or microcracks, with a H2 permeance of 1.49×10-6mol?m-2?Pa-1?s-1 and a permselectivity of 4.64 for H2/CO2 and 365.69 for H2/SF6.

Key words: phenyl groups, microporous silica membrane, porous structure, hydrophobic property, H2 permeation

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