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.