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Effect of synthesis conditions on the mesoscopical order of mesoporous silica SBA-15 functionalized by amino groups

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Abstract

Mesoporous amine-functionalized SBA-15 silica has been synthesized directly by the co-condensation of tetraethyl orthosilicate (TEOS) and aminopropyl-trimethoxysilane (APTMS) under acidic conditions with an APTMS/(APTMS + TEOS) molar ratio of 10%. The effect of synthesis conditions, including TEOS pre-hydrolysis, as well as the heating temperature and time, on the mesoscopical order and pore structure of the functionalized SBA-15 have been studied in detail by means of powder X-ray diffraction, nitrogen sorption, transmission electron microscopy, infrared spectra and solid state 29Si nuclear magnetic resonance. A functionalized SBA-15 silica with a highly ordered two-dimensional P6 mm hexagonal symmetry and a narrow pore size distribution centered at 6 nm can be obtained if TEOS is allowed to pre-hydrolyze for 2 h. For the sample with TEOS pre-hydrolysis time of 4 h, aging at 50°C or 150°C leads to a more ordered pore arrangement compared to 100°C and also a narrower pore size distribution with larger pore volume. Increasing aging time is in favor of the formation of mesoscopically ordered structure, but fails to obtain a superior pore structure.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing, 100022, P. R. China

    Qi Wei, Zuo-Ren Nie, Ya-Li Hao, Li Liu, Zeng-Xiang Chen & Jing-Xia Zou

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  1. Qi Wei
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  2. Zuo-Ren Nie
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  3. Ya-Li Hao
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  4. Li Liu
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  5. Zeng-Xiang Chen
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  6. Jing-Xia Zou
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Correspondence to Qi Wei.

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Wei, Q., Nie, ZR., Hao, YL. et al. Effect of synthesis conditions on the mesoscopical order of mesoporous silica SBA-15 functionalized by amino groups. J Sol-Gel Sci Technol 39, 103–109 (2006). https://doi.org/10.1007/s10971-006-9171-3

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  • DOI: https://doi.org/10.1007/s10971-006-9171-3

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