Imidazolium-based poly(ionic liquid)s as new alternatives for CO2 capture.

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Ionic liquids (ILs) and poly(ionic liquid)s (PILs) are recognized for their potential in gas separation and capture.
• Imidazolium-based PILs offer tunable properties, making them attractive for carbon dioxide (CO2) capture applications.
• Understanding the influence of counter anions on CO2 sorption capacity is crucial for designing efficient materials.

Purpose of the Study:

• To synthesize and evaluate novel solid imidazolium-based poly(ionic liquid)s for CO2 capture.
• To compare the CO2 sorption performance of these PILs with classical ionic liquids.
• To investigate the effect of different counter anions on the CO2 capture efficiency of poly[2-(1-butylimidazolium-3-yl)ethyl methacrylate] (BIEMA).

Main Methods:

• Synthesis of poly(ionic liquid)s based on the BIEMA cation with various counter anions (BF4-, PF6-, NTf2-, OTf-, Br-, and acetate).
• Evaluation of CO2 sorption capacity of the synthesized PILs and comparison with conventional ILs.
• Assessment of the reusability of the sorbent materials under specific regeneration conditions.

Main Results:

• The newly synthesized [BIEMA][acetate] demonstrated a remarkably high CO2 sorption performance, achieving 12.46 mg gPIL(-1).
• This performance significantly exceeded that of previously studied PILs, on average by a factor of four.
• All evaluated PILs exhibited reusability after regeneration, indicating their potential for long-term application.

Conclusions:

• Solid imidazolium-based PILs, particularly [BIEMA][acetate], are highly effective sorbents for CO2 capture.
• The choice of counter anion plays a critical role in determining CO2 sorption capacity.
• These reusable PILs represent promising candidates for efficient and sustainable carbon dioxide capture technologies.