Reviewing and screening ionic liquids and deep eutectic solvents for effective CO₂ capture.

Area of Science:

• Environmental Chemistry
• Green Chemistry
• Chemical Engineering

Background:

• Carbon dioxide (CO2) capture is critical for climate change mitigation and industrial gas purification.
• Developing efficient and environmentally friendly CO2 absorbents is a key research focus.
• Ionic liquids (ILs) and deep eutectic solvents (DESs) are emerging as promising green solvent alternatives.

Purpose of the Study:

• To review recent advancements in ILs and DESs for CO2 capture.
• To evaluate the performance of these solvents based on physical and chemical properties.
• To identify promising ILs/DESs for future CO2 capture technologies.

Main Methods:

• Comprehensive literature review of ILs and DESs for CO2 capture.
• Application of COSMO-RS (Conductor-like Screening Model for Real Solvents) to predict solvent properties.
• Performance evaluation based on key properties relevant to CO2 capture technologies.

Main Results:

• ILs and DESs exhibit unique properties suitable for CO2 capture.
• DESs offer advantages such as facile synthesis, low toxicity, and biodegradability.
• COSMO-RS predictions supplemented experimental data for performance evaluation.

Conclusions:

• ILs and DESs represent a viable green approach for CO2 capture.
• This work provides insights for selecting and developing IL/DES-based CO2 capture systems.
• Top 10 ILs/DESs were identified, offering a guide for further research and application.