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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.
Mesoporous SBA-15 with high surface hydroxyl content was synthesized by hydrothermal method and extraction method by using tetraethoxysilane (TEOS) as the silicon source and P123 as templating agent by adding proper amount of HAc and adjusting the pH of the reaction system. SBA-15 was functionalized with different levels of tetraethylenepentamine (TEPA) to obtain amino-functionalized mesoporous SBA-15. The structure of the mesoporous SBA-15 was characterized by XRD, N2sorption-desorption and Fourier transform infrared spectroscopy (FT- (IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and elemental analysis were used to characterize the structure of the material.Catalyst CO 2 was adsorbed on TEPA-functionalized mesoporous silica SBA-15 Adsorption temperature, CO 2 concentration and water on the adsorption efficiency.The experimental results show that 30% TEPA functionalized mesoporous SBA-15 has the highest CO 2 adsorption capacity and good reusability at room temperature and atmospheric pressure.