TEPA功能化SBA-15的CO_2吸附性能

CO_2 adsorption of SBA-15 functionalized by TEPA

以正硅酸乙酯(TEOS)为硅源,P123为模板剂,通过加入适量HAc及调整反应体系pH方式,采用水热及萃取法合成表面羟基含量较高的介孔SBA-15材料.以不同含量四乙烯五胺(TEPA)对SBA-15进行功能化,获得氨基功能化介孔SBA-15材料.利用X射线衍射(XRD)、N2吸-脱附、傅里叶红外光谱(FT-IR)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、元素分析等手段对材料结构性能进行表征.以不同含量TEPA功能化介孔SBA-15为吸附剂,对CO_2进行吸附,考察了吸附温度、CO_2浓度、水等对吸附效率的影响.实验结果表明,常温、常压下30%TEPA功能化介孔SBA-15的CO_2吸附量最高,且重复使用性能良好.

Using Tetraethyl orthosilicate（TEOS） and P123 as silicon source and template, mesoporous SBA-15 with high content of surface hydroxyl were prepared by hydrothermal and extraction method via adding HAc and adjusting p H of the reaction system. Amino-functionalized materials were obtained by immersing TEPA onto the surface of SBA-15. The materials were characterized by XRD, N_2 adsorption-desorption, FT-IR, SEM, TEM and element analysis. CO_2 adsorption experiments were carried out on the SBA-15 adsorbents functionalized by different TEPA, and the factors such as adsorption temperature, CO_2 concentration, and water, affecting CO_2 adsorption efficiency were investigated. The experimental results show that CO_2 capacity of 30% TEPA functionalized SBA-15 adsorbent is higher than all other samples and possesses a good reusability.