Abstract
Amino-functionalized SBA-15 materials were synthesized by cocondensation of tetraethoxysilane (TEOS) with organosilane aminopropyltrimethoxysilane (APTMS) in a wide range of molar ratios of APTMS to TEOS in the presence of triblock copolymer P123 under acidic synthesis conditions. The effects of F– periodically added into the synthesis solution and of the APTMS concentration in the initial synthesis solution on the textural properties of the functionalized SBA-15 were investigated in detail. The addition of APTMS into the initial synthesis solution can adversely affect the SBA-15 mesostructure, whereas the ordered mesostructure of the amino-functionalized SBA-15 materials can be reserved by the introduction of F– into the synthesis solution. The results from the adsorption of CO2 on the synthesized materials show that the mesoporous SBA-15 functionalized with a high concentration of APTMS in the initial synthesis solution in the presence of F– could be a potential adsorbent for CO2 capture and separation.
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