Porous Core-membrane Microstructured Nanomaterial Composed of Deep Eutectic Solvents and MOF-808 for CO₂ Capture

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Deep eutectic solvents (DES) are promising for CO2 capture but face limitations due to diffusion interactions and viscosity.
• Porous metal-organic frameworks (MOFs) offer high surface area and tunable properties for material enhancement.

Purpose of the Study:

• To develop novel core-membrane microstructured nanomaterials for improved CO2 capture.
• To investigate the synergistic effects of a porous MOF-808 core and a DES membrane on CO2 sorption performance.

Main Methods:

• Fabrication of DES@MOF-120 core-membrane nanomaterials using liquid surface tensions and electrostatic interactions.
• Characterization of CO2 sorption mechanisms including diffusion, physisorption, and chemisorption.
• Sorption isotherm analysis using Sips models to evaluate performance and predict capacity.

Main Results:

• DES@MOF-120 demonstrated significantly enhanced CO2 sorption capacities (e.g., 4.78 mmol/g at 2.4 bar) compared to the base DES (MEA-TPAC-7).
• The MOF-808 core improved diffusion within the DES membrane, overcoming viscosity-related limitations.
• Sips modeling predicted a maximum sorption capacity exceeding 6.33 mmol/g with high correlation coefficients (>0.9454).

Conclusions:

• The developed DES@MOF-120 nanomaterials represent a highly effective system for CO2 capture, outperforming conventional DESs.
• The core-membrane architecture successfully integrates the benefits of MOFs and DESs for superior sorption performance.
• This approach offers a promising pathway for developing advanced materials for efficient carbon capture technologies.