Efficient CO₂ capture by porous, nitrogen-doped carbonaceous adsorbents derived from task-specific ionic liquids

The search for a better carbon dioxide (CO₂) capture material is attracting significant attention because of an increase in anthropogenic emissions. Porous materials are considered to be among the most promising candidates. A series of porous, nitrogen-doped carbons for CO₂ capture have been developed by using high-yield carbonization reactions from task-specific ionic liquid (TSIL) precursors. Owing to strong interactions between the CO₂ molecules and nitrogen-containing basic sites within the carbon framework, the porous nitrogen-doped compound derived from the carbonization of a TSIL at 500 °C, CN500, exhibits an exceptional CO ₂ absorption capacity of 193 mg of CO₂ per g sorbent (4.39 mmol g^-1 at 0 °C and 1 bar), which demonstrates a significantly higher capacity than previously reported adsorbents. The application of TSILs as precursors for porous materials provides a new avenue for the development of improved materials for carbon capture. The art of capturing CO₂: A series of porous, nitrogen-doped carbons for CO₂ capture have been developed from task-specific ionic liquid (TSIL) precursors by using high-yield carbonization reactions. The porous, nitrogen-doped compound derived from the carbonization of a TSIL exhibits an exceptional CO₂ absorption capacity (at 0 °C and 1 bar) because of strong interactions between the CO₂ molecules and nitrogen-containing basic sites within the carbon framework.