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.