SO_2在磷酸盐离子液体中的吸收/解吸  

Absorption/Desorption of SO_2 in Two Phosphate Ionic Liquids

作　　者：李江纳[1] 张军[1] 简荣龙[1] 曾金花[1] 成睿[1] 瞿广飞[1] 

机构地区：[1]昆明理工大学环境科学与工程学院,昆明650500

出　　处：《材料导报（纳米与新材料专辑）》2014年第1期255-258,共4页

基　　金：国家自然科学基金青年基金(51008147)

摘　　要：合成了1-丁基3-甲基咪唑磷酸二丁酯和1-乙基3-甲基咪唑磷酸二乙酯两种磷酸酯类离子液,而且考察了SO2在其中的吸收/解吸特性。发现这两种离子液对SO2均有很好的吸收性能,在25℃、101kPa条件下其吸收容量高达每摩尔离子液吸收2.8mol和2.7mol SO2。此外,通过吸收/解吸实验发现其吸收容量没有明显变化,说明这类离子液对SO2的吸收有较好的稳定性。使用FTIR和1 H NMR对吸收SO2前后的离子液微观结构进行了表征,分析发现其对SO2的吸收是纯物理吸收。与本课题组之前所合成的[Bmim][PF6]和[Emim][BF4]相比,所合成的磷酸酯离子液有更高的吸收容量,这是因为离子液中磷酸盐阴离子(O=P-O)中氧原子上的自由电子与二氧化硫的路易斯酸性硫相互作用促进了吸收能力。Two kinds of phosphate ionic liquids were synthesized, and their SO2 absorption performance wereinvestigated. In the conditions of ambient temperature and normal pressure, the absorption capacity could reach 2. 8and 2. 7 mol SO2 per mole ILs respectively. Moreover, there was no change in the absorption capacity observedthrough the cycle of SO2 absorption and desorption from ionic liquids, which shows that such ionic liquids have betterstability for SO2. FTIR spectrum and 1 H NMR were used to characterize the microstructure of SO2-absorbed ILs andILs, which showed that both ionic liquids absorbed SO2 purely by physical absorption. Compared with the previous re-ported ionic liquids, the synthesized ionic liquids showed higher absorption capacity, due to the anion based phosphate（O=P-O） with the free electrons on the oxygen interacting with the Lewis acidic sulfur of SO2.

关 键 词：磷酸酯类离子液 物理吸收 SO2 催化机理 

分 类 号：X5[环境科学与工程—环境工程]