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Ion Exchange

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...

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Updated: Apr 30, 2026

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Published on: September 5, 2014

Solvent-Controlled Pathways Enable Structure-Programmable Metal-Organic Framework Membranes for Isomer Separation.

Yuecheng Wang^1,2, Yujie Ban^1,2, Ziyi Hu¹

¹State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China.

Angewandte Chemie (International Ed. in English)

|April 21, 2026

Summary

This summary is machine-generated.

Researchers developed a new method to create specialized metal-organic framework (MOF) membranes for separating challenging isomers. This solvent-triggered approach offers an energy-efficient solution for industrial separations.

Keywords:

LDH templating MOF membranes isomer separation solvent‐controlled pathway ultramicroporous sieving

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Area of Science:

Materials Science
Chemical Engineering
Nanotechnology

Background:

Separating similar aliphatic and aromatic isomers is energy-intensive using traditional methods like distillation.
Metal-organic framework (MOF) membranes offer a more energy-efficient alternative for isomer separation.
Controlling MOF membrane growth for specific pore architectures is a significant challenge.

Purpose of the Study:

To develop a solvent-triggered strategy for programming MOF membrane growth pathways.
To create MOF membranes with tailored pore architectures for specific isomer separations.
To establish a versatile platform for designing ultramicroporous MOF membranes.

Main Methods:

Utilized a vertically aligned Zn─Al layered double hydroxide (LDH) nanoarray template.
Employed a solvent-triggered pathway control strategy using N,N-dimethylformamide (DMF) and water.
Investigated surface-induced interstitial growth (in DMF) and template-conversion (in water) mechanisms.

Main Results:

DMF solvent led to a Zn-BODC membrane (∼0.5 nm pores) for n-hexane/2,3-dimethylbutane separation.
Water solvent resulted in an Al-BODC membrane (∼0.7 nm pores) for para-/ortho-xylene discrimination.
Demonstrated programmable microstructures and complementary separation performances based on solvent choice.

Conclusions:

The solvent-triggered pathway control strategy enables precise programming of MOF membrane microstructures.
This approach provides a versatile platform for designing MOF membranes for demanding isomer separations.
The developed MOF membranes offer energy-efficient solutions for industrial separation challenges.