氨基官能化的扩孔MCM-41复合材料吸附捕集CO_2

Adsorption-based CO_2 Capture by Amino-functionalized Pore-expanded MCM-41 Composite

制备了扩孔的介孔氧化硅MCM-41,然后以其为载体,通过化学接枝法将3-[2-(2-氨基乙基氨基)乙基氨基]丙基-三甲氧基硅烷嫁接到其介孔结构中,制备了氨基官能化的介孔氧化硅复合材料.通过N2吸附脱附实验、红外光谱、热重分析等手段对氨基官能化前后扩孔MCM-41的物理化学属性进行了表征,然后考察了复合材料对CO2的吸附捕集性能.结果表明:与单纯扩孔MCM-41相比,氨基官能化的扩孔MCM-41复合材料的比表面积、总孔容及孔径均减小;同时,所制复合材料对CO2的吸附量明显增大(两者的CO2吸附量分别为28 mg/g和76 mg/g),且在循环CO2吸附脱附实验中呈现出优异的稳定性.

Pore-expanded mesoporous silica （ MCM-41） was synthesized and employed as a host for grafting 3-[2-（2-aminoethylamino）ethylamino]propyl trimethoxysilane to obtain an amino-functionalized mesoporous silica compos-ite.The pore-expanded MCM-41 before and after amine immobilization were characterized by N 2 adsorption-desorption measurement , fourier-transform infrared spectroscopy , and thermal gravimetric analysis .CO2 capture performances of samples were then examined .Results showed that surface area , pore volume, and pore size of amino-functionalized pore-expanded MCM-41 composite were lower than those of pore-expanded MCM-41.At the same time, amino-func-tionalized pore-expanded MCM-41 composite showed much higher CO 2 adsorption capacity than that of pore-expanded MCM-41 only （ their CO2 capture capacity is 28 mg/g and 76 mg/g, respectively ） , and excellent stability in the cyclic CO2 adsorption-desorption experiments .