Influence of fluorination on CO₂ adsorption in materials derived from fluorinated covalent triazine framework precursors

Ultra-nanoporous materials derived from fluorinated covalent triazine frameworks (CTFs) have been developed for highly efficient CO₂ capture. A CO₂ uptake capacity of 6.58 mmol g^-1 at 273 K, 1 bar (2.45 mmol g^-1 at 0.15 bar) is achieved. The excellent performance is due to the presence of ultra-micropores (0.6-0.7 nm) that tightly fit CO₂ and strong electrostatic interactions from the residual fluorine atoms within the framework. Both molecular simulation and deep learning study predict that CTFs with a F content of ∼4.8 wt% and pore size distribution around ∼0.7 nm can give rise to the highest CO₂ uptake capacity.