Preparation and CO₂ adsorption properties of aminopropyl-functionalized mesoporous silica microspheres

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• 作者：Sadao Araki ; Hayato Doi ; Yuji Sano ; Shunsuke Tanaka ; Yoshikazu Miyake
• 关键词：Mesoporous ; Microspheres ; Carbon dioxide ; Adsorption ; Aminopropyl groups
• 刊名：Journal of Colloid and Interface Science
• 出版年：2009
• 出版时间：15 November 2009
• 年：2009
• 卷：339
• 期：2
• 页码：382-389
• 全文大小：1021 K

文摘

Aminopropyl-functionalized mesoporous silica microspheres (AF-MSM) were synthesized by a simple one-step modified Stöber method. Dodecylamine (DDA) was used as the catalyst for the hydrolysis and condensation of the silica source and as the molecular template to prepare the ordered mesopores. The mesoporous silica surfaces were modified to aminopropyl groups by the co-condensation of tetraethoxysilane (TEOS) with 3-aminopropyltriethoxysilane (APTES), up to a maximum of 20 mol. % APTES content in the silica source. The particle size, Brunauer–Emmet–Teller (BET) specific surface area, and mesoporous regularity decreased with increasing APTES content. It is believed that this result is caused by a decreasing amount of DDA incorporated into AF-MSM with increasing APTES content. It was also confirmed that the spherical shape and the mesostructure were maintained even if 20 mol. % of APTES was added to the silica source. Moreover, AF-MSM was applied to the CO₂ adsorbent. The breakthrough time of the CO₂ and CO₂ adsorption capacities increased with increasing APTES content. The adsorption capacity of CO₂ for AF-MSM, prepared at 20 mol. % APTES, was 0.54 mmol g^–1. Carbon dioxide adsorbed onto AF-MSM was completely desorbed by heating in a N₂ purge at 423 K for 30 min.