Triazine-Based Microporous Polymers for Selective Adsorption of CO2

Propeller-shaped triazine was used to syntheSite microporous polycarbazole materials through ah inexpensive Feq-catalyzed reaction using dilta oxidative coupling, (PCBZ) and extensive cross-hail-1g (PCBZL) polymerization routes. PCBZL has a Brunauet-Emmett Teller specific sutface area of 424 m(2) g(-1) and shows larger CO2 uptake (64.1 mg g(-1) at 273 K, 1 atm). Selective adsorption of CO2 over N-2 calculated using the ideal adsorbed solution theory shows that both PCBZ (125) and PCBZL (148) exhibit selectivity at 298 K, which is signifiCantly higher than pesz (110) and PCBZI, (82) at 273 K. These values of selectivity are among the highest reported for any triazine-based micropotous material. By introducing the electron-rich carbazole structure into the nitrogen fertile triazine-based system, the adsorption enthalpy is increased drastically, which in turn contributes to high selective adsorption values. The larger existing binding energy between CO2 and propeller specifies more stable and favorable interactions between adsorbent and adsorbate, which transforms into reasonable adsorption Capacity at low pressure and eventually high selectivity. These polymeric networks also show moderate working capacity with high regenerability factors. The combination of a simple inexpensive synthesis approach, high thermal/chemical stability, and reasonable selective adsorption make these materials potential candidates for CO2 storage and separation applications.