Effect of synthesis conditions on the mesoscopical order of mesoporous silica SBA-15 functionalized by amino groups |
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Authors: | Qi Wei Zuo-Ren Nie Ya-Li Hao Li Liu Zeng-Xiang Chen Jing-Xia Zou |
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Institution: | (1) College of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing, 100022, P. R. China |
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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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Keywords: | Amine-functionalized mesoporous SBA-15 silica Mesoscopical order Synthesis conditions Sol-gel process Cooperative self-assembly |
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