The development of carbon capture by functionalized ionic liquids

The CO₂ capture by functionalized ionic liquids developed in recent years was critically reviewed, where the relationship between the capacity and the enthalpy as well as that between the structure and the viscosity were discussed. This work reviews with special emphasis on tuning the basicity and designing the structure for improving absorption properties, such as adjusting the capacity and energy consumption, and decreasing the viscosity of ionic liquid. Subsequently, some unconventional absorption phenomenon was also set out detailed. Finally, the recent efforts in understanding CO₂ absorption and the future research directions were outlined.