POPs to COFs by post-modification: CO₂ chemisorption and dissolution.

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Porous organic polymers (POPs) and covalent organic frameworks (COFs) are advanced nanomaterials with diverse applications.
• CO2 capture technologies are crucial for environmental remediation.
• Chemisorption of CO2 is less explored than physisorption, with limited examples like ethylene diamine-functionalized E-COF.

Purpose of the Study:

• To report the first post-modified, non-renewable, DMSO-soluble M-POP for atmospheric H2O/CO2 trapping.
• To investigate the chemisorption of CO2 by a functionalized POP.
• To characterize the CO2 adduct formed and the material's properties.

Main Methods:

• Post-modification of aldehyde-enriched POPs with monoethanolamine (MEA) to form M-POP.
• Atmospheric CO2 trapping experiments over 48 hours.
• Characterization using solution carbon-13 nuclear magnetic resonance (13C NMR) spectroscopy.
• Powder X-ray diffraction (PXRD) for COF crystallinity analysis.

Main Results:

• Successful synthesis of a post-modified M-POP capable of trapping atmospheric CO2.
• Formation of a stable DBUH+·HCO3- adduct, verified by 13C NMR.
• Demonstration of CO2 chemisorption via carbamation, analogous to E-COF.
• Evidence of unprecedented water solubility for a 2D COF material.

Conclusions:

• Post-modification of POPs offers a viable strategy for developing effective CO2 capture materials.
• The M-POP demonstrates significant potential for atmospheric CO2 sequestration.
• The study highlights novel chemisorption mechanisms and material properties in POPs and COFs.