A review of covalent organic framework materials for CO₂ adsorption

The capture of atmospheric carbon dioxide by adsorbents is an important strategy to deal with the greenhouse effect. Compared with traditional CO2 adsorption materials like activated carbon, silica gel, and zeolite molecular sieves, covalent organic frameworks (COFs) have excellent thermal and chemical stabilities and can be produced in many different forms. Using their different possible construction units, ordered structures for specific applications can be produced, giving them broad prospects in fields such as gas storage. This review analyzes the different types of COFs that have been synthesized and their different methods of CO2 capture. It then discusses different ways to increase CO2 adsorption by changing the internal structure of COFs and modifying their surfaces. The limitations of COF-derived carbon materials in CO2 capture are reviewed and, finally, the key role of machine learning and computational simulation in improving CO2 adsorption is mentioned, and the current status and future possible uses of COFs are summarized.