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The solubilities of CO 2 in eutectic mixtures containing choline chloride and dihydric alcohols (including 1,4-butanediol, 2,3-butanediol, and 1,2propanediol) with a molar ratio of choline chloride to dihydric alcohol of 1:3 and 1:4 were measured at 293.15 K, 303.15 K, 313.15 K, and 323.15 K under pressures up to 600.0 kPa using an isochoric saturation method. Henry's constant and the dissolution Gibbs free energy, enthalpy, and entropy changes of CO 2 solvation were obtained by correlating the experimental data. The solubility of CO 2 in the mixtures increased linearly with the increasing pressure or the decreasing temperature. The enthalpies of solution were negative at all conditions.

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CO 2 capture and storage (CCS) has attracted worldwide interest because CO 2 makes a significant contribution to global warming and climate change as a major greenhouse gas. Ionic liquids are promising absorbents for carbon capture due to their negligible vapour pressures, wide liquid range, high thermal stabilities and tunable properties. This perspective review focuses on the recent advances in chemical absorption of CO 2 using functionalized ionic liquids, including amino acid-based ionic liquids, azole-based ionic liquids, phenol-based ionic liquids, and so on. Strategies for how to enhance CO 2 absorption capacity, reduce CO 2 absorption enthalpy, and improve CO 2 absorption kinetics are presented. The absorption mechanisms of these functionalized ionic liquids are explained at the molecular level through a combination of theoretical calculation and spectroscopic investigation. Particular attention is paid to the latest developments in carbon capture by non-amino anion-functionalized ionic liquids. In the last section, future directions and prospects for CO 2 capture by functionalized ionic liquids are outlined.