The difference in the CO2 adsorption capacities of different functionalized pillar-layered metal–organic frameworks (MOFs)

Abstract

The excessive use of fossil energy has caused the CO₂ concentration in the atmosphere to increase year by year. MOFs are ideal CO₂ adsorbents that can be used in CO₂ capture due to their excellent characteristics. Studies of the structure–activity relationship between the small structural differences in MOFs and the CO₂ adsorption capacities are helpful for the development of efficient MOF-based CO₂ adsorbents. Therefore, a series of pillar-layered MOFs with similar structural and different functional groups were designed and synthesized. The CO₂ adsorption tests were carried out at 273 K to explore the relationship between the small structural differences in MOFs caused by different functional groups and the CO₂ adsorption capacities. Significantly, compound 6 which contains a pyridazinyl group has a 30.9% increase in CO₂ adsorption capacity compared to compound 1 with no functionalized group.