Amine-functionalized monodispersed porous silica microspheres with enhanced CO2 adsorption performance and good cyclic stability.
Amine-functionalized monodispersed porous silica microspheres with enhanced CO2 adsorption performance and good cyclic stability.
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DOI：
10.1016/j.jcis.2013.07.014
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发表时间：
2013-10
影响因子：
9.9
通讯作者：
Yao Le;D. Guo;B. Cheng;Jiaguo Yu
中科院分区：
文献类型：
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作者：
Yao Le;D. Guo;B. Cheng;Jiaguo Yu
利用固体吸附剂捕集二氧化碳已引起世界各国越来越多的关注。通过正硅酸乙酯(TEOS)在水-乙醇-十二胺混合溶液中的水解和缩合，然后在600℃下焙烧，最后用四乙基五胺(TEA)官能化，制备了胺功能化的单分散多孔二氧化硅微球(MPSM)。用美国Micromeritics公司的Chemisorb 2720脉冲化学吸附系统测试了制备的样品对二氧化碳的吸附性能。结果表明，600℃焙烧后的二氧化硅微球的比表面积和孔容分别达到921×m~2/g和0.48×cm~3/g。所有的TEA功能化样品都表现出良好的CO2吸附性能，这与所制备样品的载茶量、吸附温度和比表面积有关。确定了最佳的茶叶负载量(34wt%)和吸附温度(75℃)。在TEA负载量为34wt%的600℃焙烧的−微球样品上，获得了最大的CO2吸附量(4.27mmolg SiO_2 1吸附剂)。重复吸附/脱附循环实验表明，TEA功能化的二氧化硅微球是一种良好的CO2吸附剂，表现出良好的循环稳定性。
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 CO2adsorption 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 SiO2microspheres reached 921 m2/g and 0.48 cm3/g, respectively. All the TEA-functionalized samples exhibited good CO2adsorption 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 (34 wt%) and adsorption temperature (75 °C) were determined. The maximum CO2adsorption amount (4.27 mmol g−1adsorbent) was achieved on the 600 °C-calcined SiO2microsphere sample with TEA loading of 34 wt%. Repeated adsorption/desorption cycle experiments revealed that the TEA-functionalized SiO2microspheres were good CO2adsorbents exhibiting excellent cyclic stability.