Controllable construction of ionic frameworks for multi-site synergetic enhancement of CO₂ capture

Abstract

CO₂ capture is one of the key technologies for dealing with the global warming and implementing low-carbon development strategy. The emergence of ionic metal-organic frameworks (I-MOFs) has diversified the field of porous materials, which have been extensively applied for gas adsorption and separation. In this work, amino-functionalized imidazolium ionic liquid as organic monodentate ligand was used for one step synthesis microporous Cu based I-MOFs. Precise tuning of the adsorption properties was obtained by incorporating aromatic anions, such as phenoxy, benzene carboxyl, and benzene sulfonic acid group into the I-MOFs via a facile ion exchange method. The new I-MOFs showed high thermal stability and high capacity of 5.4 mmol·g^–1 under atmospheric conditions for selective adsorption of CO₂. The active sites of microporous Cu-MOF are the ion basic center and unsaturated metal, and electrostatic attraction and hydroxyl bonding between CO₂ and modified functional sulfonic groups are responsible for the adsorption. This work provides a feasible strategy for the design of I-MOF for functional gas capture.

Graphical abstract

Keywords

carbon dioxide capture / micropores / ionic liquids / multi-site synergism / ionic metal-organic frameworks

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