介孔SiO_2表面的氨基修饰及吸附性能研究

Adsorption Properties of Amino-Functionalized Mesoporous Silica

以十六胺为模板剂、正硅酸乙酯为硅源合成了多孔球形结构的介孔SiO2,用γ-氨基丙基三乙氧基硅烷(ATES)对介孔SiO2进行了表面修饰,得到了氨基嫁接介孔ATES-SiO2。利用XRD、BET、IR等方法分别测定了SiO2和ATES-SiO2的结构与性质,结果表明-NH2已成功接枝于介孔ATES-SiO2的孔道内表面。在常温常压下测得介孔SiO2和ATES-SiO2对CO2的吸附量分别为0.93 mmol/g和4.87 mmol/g。

Mesoporous SiO2 microspheres were synthesized from n-hexadecylamine and tetraethoxyorthosilicate （TEOS） under specific experimental conditions. The mesoporous SiO2 was modified with 3-aminopropyl-triethoxysilane by post-synthesis silylation methods. The structure and physicochemical properties of the material were characterized with low-angle XRD and N2 adsorptiondesorption. The introduction of the amino functional groups inside the mesoporous channel was identified by IR. The CO2 adsorption capacities of SiOz increased from 0. 93 mmol/g to 4. 87 mmol/g after modification at room temperature and normal pressure.