Fine-tuning covalent organic frameworks for structure-activity correlation via adsorption and catalytic studies.

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Covalent Organic Frameworks (COFs) show promise for adsorption and catalysis.
• The relationship between COF crystallinity, surface area, and active sites is not fully understood.

Purpose of the Study:

• To investigate the structure-activity relationship (SAR) of COFs with varying structural order and heteroatom content.
• To explore the influence of COF properties on CO2 and iodine adsorption and CO2 cycloaddition reactions.

Main Methods:

• Synthesized three isoreticular COFs: COP-N18 (short-range order), COF-N18 (long-range order), and COF-N27 (semicrystalline with heteroatoms).
• Evaluated CO2 and iodine adsorption capacities and kinetics.
• Performed CO2 cycloaddition reactions with epoxides of varying polarity.

Main Results:

• Increased crystallinity, surface area, and pore volume positively impacted adsorption and catalysis.
• Heteroatoms in COFs led to complex behavior in CO2 adsorption and cycloaddition reactions.
• COF-N18 exhibited faster iodine adsorption (1.79 g/h) compared to heteroatom-doped COFs (0.35 g/h).

Conclusions:

• Structural fine-tuning of COFs is crucial for optimizing their performance as adsorbents and catalysts.
• COFs offer a promising platform for environmental applications, particularly in CO2 capture and conversion.