Frontiers of Chemical Science and Engineering
>> 2024,
Volume 18,
Issue 1
doi:
10.1007/s11705-023-2370-4
Controllable construction of ionic frameworks for multi-site synergetic enhancement of CO2 capture
1. State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, China
2. School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
3. Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan 030024, China
Received: 2023-01-14
Revised: 2023-09-06
Accepted: 2023-11-09
Available online: 2024-01-15
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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.
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