Bipyridinium-Based Ionic Covalent Triazine Frameworks for CO2, SO2, and NO Capture.

The exploitation of novel porous materials for capturing/adsorption of harmful gases is considered a very promising approach to deal with air pollution. Herein, bipyridinium-based ionic covalent triazine frameworks (ICTFs) were synthesized via ZnCl2-catalyzed ionothermal polymerization. The as-prepared ICTFs had a satisfactory total pore volume and specific surface of approximately 0.4582 cm3 g-1 and 1000 m2 g-1, respectively. Moreover, the specific surface area, pore size and distribution, and total pore volumes of ICTFs could be adjusted via ion-exchange of the anion. The obtained ICTFs were explored as the adsorbent for the separation/adsorption of the mixed gases (SO2, CO2, NO, and N2), and they showed the strong adsorption ability for CO2 (2.75 mmol g-1), SO2 (9.22 mmol g-1), and NO (4.05 mmol g-1) at 1 bar and 298 K. This unique design provides a new insight to prepare high-efficiency porous materials for CO2, SO2, and NO capture.