A thiadiazole-functionalized covalent organic framework for efficient CO2 capture and separation

Abstract A new covalent organic framework (TH-COF-1) was synthesized by Schiff-base condensation of thiadiazole-functionalized diamine and aldehyde. With thiadiazole rings in pore walls, the TH-COF-1 displayed excellent microporous characteristics and abundant nitrogen sites, which exhibited CO2 uptake capacity and selectivity superior to the analogous COF-LZU1 without thiadiazole rings. The pore-wall functionalization of COFs with CO2-philic groups by bottom-up synthesis was proved to be a powerful strategy to improve CO2 capture and separation.