固载离子液体聚合物的制备及其二氧化碳吸附性能  

Preparation and CO_2 Adsorption Property of Silica-Immobilized Imidazolium Ionic Liquid Polymers

作　　者：刘景霞[1] 朱佳媚[1] 谷行 孙雅钗[1] 

机构地区：[1]中国矿业大学化工学院,江苏徐州221116

出　　处：《精细化工》2015年第10期1119-1125,1146,共8页Fine Chemicals

基　　金：中央高校基本科研业务费专项资金资助(2012QNA16);江苏高校优势学科建设工程资助项目~~

摘　　要：分别采用溶液聚合法和表面引发反向原子转移自由基聚合法(ATRP),在硅胶表面接枝离子液体聚合物,并对其进行了FTIR、TG和SEM表征。研究了固载离子液体聚合物样品的CO2吸附性能和CO2/N2的选择性能,探讨了CO2在固载离子液体聚合物上的吸附热力学和动力学行为。结果表明:由ATRP法制备的固载离子液体聚合物,其接枝量远大于溶液聚合法;而溶液聚合法制备的样品具有较发达的孔结构,在273 K、0.1 MPa时,样品的CO2吸附量达4.54%(1.03 mmol/g);固载离子液体聚合物较空白硅胶具有更优的CO2/N2选择性,且循环使用性良好;CO2在固载离子液体聚合物上的吸附为物理吸附;与离子液体聚合物相比,CO2在固载离子液体聚合物中的扩散效率更高。The grafting polymerization of ionic liquids on silica surface was performed by the solution polymerization and surface-initiated atom transfer radical polymerization methods. The silicaimmobilized ionic liquid polymers were characterized via FTIR,TG and SEM analysis. The CO2 adsorption property and the selectivity of CO2/ N2 were investigated. The CO2 thermodynamic study and diffusion performance of silica-immobilized ionic liquid polymers were also discussed. The results show that loading amount of ionic liquid made by the surface initiated ATRP method is much higher than that by the solution polymerization method. The sample prepared by solution polymerization method presents more developed porous structure,and the CO2 adsorption of them can reach 4. 54%（ 1. 03 mmol/g） at273 K and 0. 1 MPa. The CO2/ N2 selectivity of the silica-immobilized ionic liquid polymers is much better than that of the bare silica. The silica-immobilized ionic liquid polymers exhibit good CO2 sorption/desorption cycle capacity. The sorption of CO2 on silica-immobilized ionic liquid polymers is likely due to physisorption. The diffusion coefficients of CO2 adsorption on silica-immobilized ionic liquid polymers are much higher than those of the ionic liquid polymers.

关 键 词：离子液体 CO2吸附剂 溶液聚合 表面引发反向原子转移自由基聚合 催化与分离提纯技术 

分 类 号：TQ252.3[化学工程—有机化工]