Functionalized Covalent Organic Framework: Boosting CO₂ Adsorption via Porous Structure Engineering and Molecular...

Area of Science:

• Materials Science
• Chemistry
• Nanotechnology

Background:

• Porous crystalline materials like covalent organic frameworks (COFs) are promising for gas adsorption.
• Functionalization of COFs can tune their properties for specific applications.
• CO2 capture remains a critical challenge in environmental science.

Purpose of the Study:

• To investigate the effect of functional group modification on CO2 adsorption properties of COFs.
• To compare the performance of methoxy-modified (COF-A-OMe) and vinyl-modified (COF-A-Vinyl) COFs with the original COF-A.
• To understand the adsorption mechanism and the role of specific functional groups.

Main Methods:

• Synthesis of functionalized COF materials (COF-A-OMe, COF-A-Vinyl).
• Characterization of COF materials for topology and thermal stability.
• Evaluation of CO2 adsorption performance.
• Density Functional Theory (DFT) simulations to elucidate adsorption mechanisms.

Main Results:

• Modified COFs (COF-A-OMe and COF-A-Vinyl) exhibited improved CO2 adsorption compared to the original COF-A.
• Enhanced adsorption is attributed to increased specific surface area and pore volume.
• Optimized interactions between functional groups and CO2 molecules were observed.
• DFT simulations confirmed a synergistic role of -C═N- and -CH═CH2 groups in COF-A-Vinyl for CO2 adsorption.

Conclusions:

• Functional modification of COFs is an effective strategy to enhance CO2 adsorption.
• Specific functional groups can significantly influence adsorption capacity and mechanism.
• These findings support the rational design of organic frameworks for advanced gas adsorption applications.