Efficient CO2/N2 selective adsorption using benzenedipyrazolate-based metal–organic frameworks (BDP-MOFs)

Abstract

This work demonstrates efficient selective adsorption of CO2 from N2 using two Zn-based BDP MOFs functionalized with imidazole and zwitterionic groups. In the single-component gas adsorption isotherms, both N-ZnMOF and Z-ZnMOF show the selective adsorption of CO2 over N2 and CH4. Zn(BDP) with imidazole integration demonstrated the same behavior in adsorption isotherms; however, the imidazole-functionalized Zn(BDP) (N-ZnMOF) exhibits similar adsorption behavior to the parent Zn(BDP) framework, whereas incorporating a zwitterionic group (Z-ZnMOF) leads to a notably different adsorption behavior. Both MOFs exhibited high selectivity for CO2 over N2 at room temperature and 25 bar in power plant and direct air condition. This work suggests a new potential application for gas selective adsorption and storage using BDP-based MOFs integrated with imidazole and zwitterionic groups.