State Key Laboratory of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology, Luoshi Road 122#, Wuhan 430070, PR China.
J Colloid Interface Sci. 2013 Oct 15;408:173-80. doi: 10.1016/j.jcis.2013.07.014. Epub 2013 Jul 20.
Carbon dioxide capture using solid adsorbent has caused more and more attention in the world. Herein, amine-functionalized monodispersed porous silica microspheres (MPSM) were prepared by the hydrolysis and condensation of tetraethoxysilane (TEOS) in a water-ethanol-dodecylamine mixed solution, then calcined at 600°C, and finally functionalized with tetraethylenepentamine (TEA). The CO2 adsorption performance of the prepared samples was measured using a Chemisorb 2720 pulse chemisorption system (Micromeritics, USA). The results showed that the specific surface area and pore volume of the 600°C-calcined SiO2 microspheres reached 921m(2)/g and 0.48cm(3)/g, respectively. All the TEA-functionalized samples exhibited good CO2 adsorption performance, which were related to the amount of loaded TEA, adsorption temperatures, and the specific surface areas of the prepared samples. An optimal TEA loading amount (34wt%) and adsorption temperature (75°C) were determined. The maximum CO2 adsorption amount (4.27mmolg(-1) adsorbent) was achieved on the 600°C-calcined SiO2 microsphere sample with TEA loading of 34wt%. Repeated adsorption/desorption cycle experiments revealed that the TEA-functionalized SiO2 microspheres were good CO2 adsorbents exhibiting excellent cyclic stability.
使用固体吸附剂捕集二氧化碳在世界范围内引起了越来越多的关注。在此，通过在水-乙醇-十二胺混合溶液中水解和缩合四乙氧基硅烷（TEOS），制备了胺功能化的单分散多孔硅微球（MPSM），然后在 600°C 下煅烧，最后用四乙烯五胺（TEA）功能化。使用 Micromeritics 公司的 Chemisorb 2720 脉冲化学吸附系统（美国）测量了制备样品的 CO2 吸附性能。结果表明，600°C 煅烧的 SiO2 微球的比表面积和孔体积分别达到 921m2/g 和 0.48cm3/g。所有 TEA 功能化的样品均表现出良好的 CO2 吸附性能，这与负载的 TEA 量、吸附温度以及制备样品的比表面积有关。确定了最佳的 TEA 负载量（34wt%）和吸附温度（75°C）。在 TEA 负载量为 34wt%的 600°C 煅烧的 SiO2 微球样品上，达到了最大的 CO2 吸附量（4.27mmolg(-1) 吸附剂）。重复吸附/解吸循环实验表明，TEA 功能化的 SiO2 微球是良好的 CO2 吸附剂，表现出优异的循环稳定性。
