Cis/Trans Mononuclear Copper(II) Nodes with Dual Open-Metal and Lewis-Base Sites: A Metal-Organic Framework Enabling...

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Porous materials are essential for selective CO2 capture from flue gas and biogas.
• Ecological conservation and clean energy advancement necessitate efficient CO2 separation technologies.

Purpose of the Study:

• To synthesize a novel three-dimensional copper-based metal-organic framework (Cu-MOF).
• To investigate the CO2 capture capacity and selectivity of the synthesized Cu-MOF.
• To explore the potential of the Cu-MOF for low-energy CO2 separation from flue gas and biogas.

Main Methods:

• Solvothermal synthesis of a novel Cu-MOF using a multifunctional ligand.
• Characterization of the Cu-MOF structure, including dual-site distribution of open-metal sites (OMSs) and Lewis-base sites (LBSs).
• CO2/N2 selectivity measurements and breakthrough experiments.
• Computational analysis using Grand-canonical Monte Carlo and DFT calculations.

Main Results:

• The synthesized Cu-MOF exhibits a high density of OMSs (2.84 per nm3) and abundant LBSs.
• Achieved a CO2 uptake capacity and a CO2/N2 selectivity of 112.
• Demonstrated dynamic CO2 uptake of 2.42 mmol g-1 per cycle with excellent recyclability.
• Computational studies confirmed synergistic CO2 binding to both OMSs and LBSs.

Conclusions:

• The novel dual-SBU Cu-MOF design enhances CO2 capture performance through synergistic binding.
• The material shows significant potential for efficient and low-energy CO2 separation from industrial gas streams.
• This research contributes to the development of advanced materials for carbon capture and climate change mitigation.