Ultra-microporous Metal-organic Framework with High Concentration of Free Carboxyl Groups and Lewis Basic Sites for CO2 Capture at Ambient Conditions

摘要

How to rationally design effective and practical CO2 adsorbent is a great challenge.Herein,an ultra-microporous metal-organic framework (FJI-H19) with high concentration of free carboxyl groups and uncoordinated Lewis basic sites has been synthesized from a multi-dental ligand with a high proportion of polar CO2-philic atoms.FJI-H19 displays a relatively high CO2 volumetric uptake (120 cm3·cm-3) with high selectivity under practical atmosphere (298 K and 1 bar).Further researches demonstrate that such high adsorption results from an unusual synergistic effect from free carboxyl group and uncoordinated N atoms.This result will provide a potential strategy for developing more effective and pratical CO2 adsorbent based on MOFs.