用于CO_2吸收的氨基功能化固载离子液体的合成与表征

Synthesis and characterization of amine-immobilized ionic liquid for capture of CO_2

以多孔硅胶为载体,采用有机-无机嫁接的方法在硅胶表面合成氨基功能化的离子液体。通过元素分析,碳核磁共振确定该固体材料的组成和结构。通过热重分析、BET等手段对其性能进行表征,测得该固体材料具有较高的比表面积和较好的热稳定性。35℃时,材料在压力为常压,0.4,0.7与1.0 MPa测得CO2的吸收量分别为0.041,0.068,0.189和0.405mmol/g,且随着压力的增大,其吸附量迅速增加。材料重复使用5次,其CO2吸收量没有明显下降。

A new amino-functionalized ionic liquid immobilized on silica was prepared by the organic-inorganic grafting method.Its structure and composition were confirmed by element analysis and nuclear magnetic reso-nance.The product presents a high specific surface area and excellent thermal stability in terms of the results of thermogravimetric analysis and BET.The absorbing contents of CO 2 in the ionic liquid were measured as 0.041, 0.068,0.189 and 0.405 mmol/g in the corresponding pressure of atmospheric pressure,0.4,0.7 and 1.0 MPa, respectively.With the increase of adsorption pressure,the adsorption capacity increases rapidly.After recycling use of the product for 5 times,the absorption capacity didn’t decrease significantly.