[Bmim]BF_4@SBA-15负载化离子液体制备及表征

Preparation and characterization of [Bmim]BF_4@SBA-15 supported ionic liquids

离子液体是吸收CO_2的绿色溶剂,负载化离子液体能有效增加离子液体的界面积,减少离子液体用量,促进CO_2的吸收。采用传统浸渍法和超临界CO_2辅助法制备负载化离子液体,选用乙醇作为共溶剂,考察不同参数对负载量的影响。对制备载体进行CO_2吸附性能评价,并比较不同的离子液体和负载化工艺条件对CO_2吸附性能的影响。结果表明,CO_2吸附量随离子液体负载量增加而增加,且负载量相同情况下,超临界CO_2辅助法制备的负载化离子液体具有更大的比表面积和孔容,能促进CO_2的吸收。

The ionic liquid is a kind of green solvent for absorbing CO2 and the supported ionic liquid can effectively increase the ionic liquid interface area,reduce the amount of ionic liquid and promote the absorption of CO2.Using traditional impregnation method and supercritical CO2 assisted method to prepare the supported ionic liquid,and choosing alcohol as the cosolvent to investigate the effect of different parameters on the loading.Evaluate the CO2 adsorption performance on the prepared carrier,and compare the effects of different ionic liquids and loading process conditions on CO2 adsorption.The results show that the amount of CO2 adsorbed increases with the increase of ionic liquid loading,and that under the same loading condition,the supported ionic liquids prepared by supercritical CO2 assisted method have higher specific surface area and pore volume,and can promote the absorption of CO2.