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.