Carbon dioxide absorbent and carbon dioxide separation device

Abstract

According to one embodiment, a carbon dioxide absorbent is provided. The carbon dioxide absorbent includes an aqueous electrolytic solution, which contains an aqueous solvent, a nitrogen-containing heterocyclic compound having two or three rings fused, and an electrolyte containing an ionic salt. According to one aspect of the carbon dioxide absorbent, a reduction form of the nitrogen-containing heterocyclic compound has a degree of solubility to water of pH6 at 25° C. of 0.001 mol/L or more. According to another aspect, an average particle diameter of a dispersed component in the aqueous electrolytic solution after a reduction current is applied to the aqueous electrolytic solution is 300 nm or less.

Dependencies are inferred from the claim text.