高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

以EDTANa2为矿化剂近中性条件下室温合成介孔二氧化硅

肖强1, 王金桂1, 高地1, 孙平川1, 袁忠勇1, 陈铁红1, 李宝会2, 丁大同2   

    1. 南开大学化学学院,
    2. 物理学院, 天津, 30071
  • 收稿日期:2005-11-15 修回日期:1900-01-01 出版日期:2006-08-10 发布日期:2006-08-10
  • 通讯作者: 陈铁红

Synthesis of Mesoporous Silica at Room Temperature and Near-neutral pH with EDTANa2 as Mineralization Agent

XIAO Qiang1, WANG Jin-Gui1, GAO Di1, SUN Ping-Chuan1, YUAN Zhong-Yong1, CHEN Tie-Hong1, LI Bao-Hui2, DING Da-Tong2   

    1. College of Chemistry,
    2. College of Physics, Nankai University, Tianjin 300071, China
  • Received:2005-11-15 Revised:1900-01-01 Online:2006-08-10 Published:2006-08-10
  • Contact: CHEN Tie-Hong

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摘要： 利用EDTANa2作为矿化剂, 在近中性条件下于室温合成了厚壁(约3 nm)蠕虫介孔分子筛. 在反应物配比为n(CTAB):n(TEOS):n(EDTANa2):n(H2O)=(0.05~0.2):(0.1~2):(0.1~0.5):(100~500)范围内都能得到介孔二氧化硅. 以XRD、N2吸附、FTIR、SEM和TEM详细考察了体系配比和温度对介孔二氧化硅结构和形貌的影响, 发现CTAB用量越大, 介孔d值相应增大. 温度对介孔二氧化硅的结构和形貌有很大的影响, 温度在2~15 ℃范围内都能生成孔径分布较规则的介孔, 介孔材料的形貌随温度的升高由空心管变成小颗粒聚集体; 合成的介孔分子筛中的模板剂可以通过乙醇萃取的方式除去. 提出了介孔的生成遵从(S+-E-)0-I0中性模板机理.

关键词: 介孔二氧化硅, 中性pH, 室温, 厚壁, EDTANa2

Abstract: Using EDTANa2 as mineralization agent, mesoporous silicas with wormlike mesopores and thick pore wall(about 3 nm) were facilely synthesized at room temperature and near-neutral pH. The mesoporous silica can be obtained with reactants molar composition range of n(CTAB):n(TEOS):n(EDTANa2):n(H2O)=(0.05—0.2):(0.1—2):(0.1—0.5):(100—500). XRD, N2 sorption, FTIR, SEM and TEM methods were carried out to investigate the topological and morphological properties of the mesoporous silicas. As the amount of CTAB increased, the d spacing value of mesoporous silica increased correspondingly. Temperature has a great effect on the synthesis of mesoporous silica. When temperature increased from 2 ℃ to 20 ℃, morphologies of the mesoporous silica varied from hollow micro-tubes to granule aggregates. Based on the experiments, a modified neutral mechanism of (S+-E-)0-I0 was proposed.

Key words: Mesoporous silica, Neutral pH, Room temperature, Thick-wall, EDTANa2

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