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Updated: Jan 25, 2026
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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
Published on: August 16, 2018
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Highly Cation Permselective Metal-Organic Framework Membranes with Leaf-Like Morphology.
Tingting Xu1, Muhammad A Shehzad1, Dongbo Yu1
1CAS Key Laboratory of Soft Matter Chemistry, iCHEM (Collaborative Innovation Center of Chemistry for Energy Materials), Department of Chemistry, School of Chemistry and Materials University of Science and Technology of China, Hefei, 230026, China.
Chemsuschem
|April 26, 2019
Summary
Researchers developed a scalable method to create ultrathin metal-organic framework (MOF) membranes for efficient cation separation. These novel UiO-66-NH2 membranes show high selectivity for lithium and sodium ions, overcoming previous fabrication challenges.
Area of Science:
- Materials Science
- Chemical Engineering
- Nanotechnology
Background:
- Metal-organic framework (MOF) membranes are crucial for selective cation extraction.
- Challenges include defect-free fabrication and poor water stability of traditional MOF membranes.
Purpose of the Study:
- To develop a scalable and robust method for fabricating highly cation permselective MOF membranes.
- To enhance the performance of MOF membranes for valuable metal ion extraction.
Main Methods:
- Controlled in-situ growth of UiO-66-NH2 into leaf-like nanostructures on anodic aluminum oxide.
- Fabrication of seamless, ultrathin (<500 nm) membranes with tunable leaf density and surface layer thickness.
Main Results:
- Achieved highest reported cation separations: Na+/Mg2+ >200 and Li+/Mg2+ >60.
- Demonstrated excellent membrane stability over five sequential electrodialysis cycles.
- Membranes possess nanosized interstices and angstrom-sized inherent pores for efficient ion transport and selectivity.
Conclusions:
- The developed MOF membranes offer a promising solution for efficient lithium and sodium ion extraction from natural sources.
- The scalable fabrication method overcomes key limitations of previous MOF membrane technologies.
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