An Azine-Linked Covalent Organic Framework: Synthesis, Characterization and Efficient Gas Storage

Area of Science:

• Materials Science
• Chemistry

Background:

• Covalent organic frameworks (COFs) are crystalline porous polymers with tunable properties.
• Developing novel COFs with enhanced gas adsorption is crucial for energy and environmental applications.

Purpose of the Study:

• To design and synthesize a new azine-linked COF, named COF-JLU2.
• To evaluate the gas storage and separation performance of COF-JLU2.

Main Methods:

• Solvothermal condensation of hydrazine hydrate and 1,3,5-triformylphloroglucinol.
• Characterization of COF-JLU2's structure, crystallinity, and thermal/chemical stability.
• Measurement of CO2, CH4, and H2 uptake and CO2/N2 selectivity.

Main Results:

• COF-JLU2 was successfully synthesized, exhibiting permanent micropores, high crystallinity, and good stability.
• The material shows a BET surface area over 410 m²/g and a pore volume of 0.56 cm³/g.
• COF-JLU2 achieved significant CO2 uptake (217 mg/g) and H2 storage (16 mg/g), outperforming other COFs.

Conclusions:

• COF-JLU2 is a promising material for carbon dioxide capture and hydrogen storage.
• The azine linkage and heteroatom sites contribute to its enhanced gas adsorption properties.
• Further research can explore modifications of COF-JLU2 for optimized gas storage applications.