Business Promotion and Product Development Center, Technical Research Institute, Hitachi Zosen Corporation, 2-11, Funamachi 2-chome Taisho-Ku, Osaka 551-0022, Japan.
J Colloid Interface Sci. 2009 Nov 15;339(2):382-9. doi: 10.1016/j.jcis.2009.07.024. Epub 2009 Jul 16.
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 20mol.% 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 20mol.% of APTES was added to the silica source. Moreover, AF-MSM was applied to the CO(2) adsorbent. The breakthrough time of the CO(2) and CO(2) adsorption capacities increased with increasing APTES content. The adsorption capacity of CO(2) for AF-MSM, prepared at 20mol.% APTES, was 0.54mmolg(-1). Carbon dioxide adsorbed onto AF-MSM was completely desorbed by heating in a N(2) purge at 423K for 30min.
氨基丙基功能化介孔硅微球（AF-MSM）是通过简单的一步改进的 Stöber 法合成的。十二胺（DDA）既用作硅源水解和缩合的催化剂，又用作制备有序介孔的分子模板。通过四乙氧基硅烷（TEOS）与 3-氨丙基三乙氧基硅烷（APTES）的共缩合，将介孔硅表面改性为氨基丙基，硅源中 APTES 的最大含量可达 20mol%。随着 APTES 含量的增加，颗粒尺寸、BET 比表面积和介孔规整度降低。据信，这一结果是由于随着 APTES 含量的增加，掺入 AF-MSM 的 DDA 量减少所致。还证实了即使向硅源中添加 20mol%的 APTES，也能保持球形和介孔结构。此外，AF-MSM 被应用于 CO（2）吸附剂。CO（2）的穿透时间和 CO（2）吸附容量随 APTES 含量的增加而增加。在 20mol% APTES 下制备的 AF-MSM 的 CO（2）吸附容量为 0.54mmolg（-1）。吸附在 AF-MSM 上的二氧化碳在 423K 下用 N（2）吹扫 30min 即可完全解吸。
