An increase in hydrogen bond acceptor basicity (β) and a decrease in hydrogen bond donor acidity (α) simultaneously promotes higher CO2 uptake in deep eutectic solvents.
Compared to the large |α–β| in DESs, a relatively small |α–β| brings “synergistic interaction“ into play and allows the donor and acceptor components to react efficiently with CO2 molecules in DES.
Equivalent donor and acceptor tendencies in DESs bring strong synergistic interaction into play and result in high CO2 uptake by lowering the ΔH° and ΔS°.
Natural deep eutectic solvents (NADES) as green solvents for carbon dioxide capture
