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Extraction: Advanced Methods

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...

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Related Experiment Video

Updated: Jun 20, 2026

Preparation of Hydrophobic Metal-Organic Frameworks via Plasma Enhanced Chemical Vapor Deposition of Perfluoroalkanes for the Removal of Ammonia

Preparation of Hydrophobic Metal-Organic Frameworks via Plasma Enhanced Chemical Vapor Deposition of Perfluoroalkanes for the Removal of Ammonia

Published on: October 10, 2013

Ammonia-Induced Metal-Organic Framework Membrane Pore Tuning for Hydrogen Separation.

Eunji Choi¹, Seungho Yu², Taehwan Kim³

¹Laboratory of Advanced Separations, École Polytechnique Fédérale de Lausanne (EPFL), 17 Rue de l'Industrie, Sion, Valais, Switzerland.

Angewandte Chemie (International Ed. in English)

|March 11, 2026

Summary

Ammonia exposure tunes Metal-Organic Framework (MOF) membranes, enhancing hydrogen/nitrogen separation. This method improves MOF membrane performance for cleaner hydrogen production by controlling gas transport properties.

Keywords:

ammonia hydrogen separation membrane separation pore tuning zeolitic imidazolate framework

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Last Updated: Jun 20, 2026

Preparation of Hydrophobic Metal-Organic Frameworks via Plasma Enhanced Chemical Vapor Deposition of Perfluoroalkanes for the Removal of Ammonia

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Published on: October 10, 2013

Synthesis and Characterization of Functionalized Metal-organic Frameworks

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Published on: September 5, 2014

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

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Published on: August 16, 2018

Area of Science:

Materials Science
Chemical Engineering
Separation Technology

Background:

Ammonia is crucial for clean hydrogen production via processes like ammonia cracking.
Trace ammonia is a critical impurity in purification steps due to its toxicity and corrosivity.
Metal-Organic Framework (MOF) membranes offer tunable properties for gas separation.

Purpose of the Study:

To investigate ammonia as a tuning agent for MOF membranes.
To control the gas transport behavior of MOF membranes using ammonia.
To enhance hydrogen/nitrogen separation performance of MOF membranes.

Main Methods:

Treatment of ZIF-8 MOF membranes with ammonia.
Analysis of membrane structural changes (amorphization and rigidification).
Gas separation performance testing (H2/N2) and molecular dynamics simulations.

Main Results:

Ammonia treatment induces partial surface amorphization and rigidifies adjacent ZIF-8 regions.
The treated membrane exhibits intrinsic gas-selective properties, improving H2/N2 separation.
Achieved H2 permeance of 1.26 × 10^-7 mol/m²·Pa·s and H2/N2 selectivity of 122.39.

Conclusions:

Ammonia can precisely control MOF membrane flexibility and separation properties.
This approach offers a new strategy for tuning MOF-based membranes for gas separations.
Demonstrated potential for maintaining high separation performance in the presence of impurities.