Ionic liquids(IL)are completely the liquid compounds composed of specific cation and anion existing at or close to room temperature in the liquid state.Ionic liquids have been considered as a kind of potential candidates for CO2capture

on the basis of their unique properties like easy structural modification or functionalization

especially their strong affinity to CO2.In the conventional ILs

CO2is absorbed by occupying the free space between the ions

high pressure is needed in this physical absorption process

and the absorption capacity is relatively low.Functionalized ILs is another good option for CO2absorption

which is a chemical process.Taking into account the chemical interaction of amino with CO2 molecule

introduction of amino-group or other alkaline groups into IL would construct functionalized ionic liquids for the CO2removal.In this paper

the mechanism and research progress of the absorption of CO2by ionic liquid are introduced.Furthermore

the prospect for the development and direction of the ionic liquid CO2fixation is indicated.