5. CONCLUSIONS
A series of carbanion-based ILs and DESs are developed successfully in the paper for efficient capture of CO2. The super-nucleophilic nature of carbanion favors the direct insertion of CO2 to form carbanion-CO2 adduct and enable high absorption capacities of ILs and DESs. In comparison with the pure ILs, the SNDESs are additionally featured with much low viscosity, fast absorption of CO2, excellent recyclability, and abundant hydrogen bond interactions for the energy reduction during the absorption. In particular, the carbanion siting and hydrogen bonding can function synergistically in the absorption of CO2 in [N2222][CH(CN)2]-Eim, and the new absorption mechanism is verified from spectroscopic analyses together with thermodynamic and quantum calculations. The achievements made in this work provide an alternative design strategy of SNDESs, and the SNDESs are believed to have great potential in the applications of CO2 capture.