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.

Key words： carbon dioxide capture; micropores; ionic liquids; multi-site synergism; ionic metal-organic frameworks

Competing interests

The authors declare that they have no competing interests.

Acknowledgements

This work is financially supported by the National Natural Science Foundation of China (Grant No. 22272125), Knowledge Innovation Program of Wuhan-Basic Research (Grant No. 2022020801010354), Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering (Grant No. 2022SX-TD015) and Joint Fund of the Yulin University and the Dalian National Laboratory for Clean Energy (Grant No. YLU-DNL Fund 2021021). The authors would like to thank all the reviewers who participated in the review and MJEditor for its linguistic assistance during the preparation of this manuscript.

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