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Ion Exchange01:17

Ion Exchange

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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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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...
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The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Isomeric Nonpolar Amino Acid-Derived Metal-Organic Frameworks for Xenon/Krypton Separation.

Yijun Yang1, Yingying Zhang1, Pengfei Li2

  • 1Jiangsu Key Laboratory of Biomedical Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, China.

Angewandte Chemie (International Ed. in English)
|April 24, 2026
PubMed
Summary

Researchers developed novel metal-organic frameworks using amino acids for efficient xenon/krypton separation. The isoleucine-based framework (Zn-ILE) shows enhanced xenon uptake and selectivity, offering a cost-effective solution.

Keywords:
Xe/Kr separationamino acidmetal‐organic frameworknonpolar

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Separation Science

Background:

  • Efficient separation of xenon (Xe) and krypton (Kr) is crucial but challenging due to their similar properties.
  • Metal-organic frameworks (MOFs) offer tunable pore environments for gas separation applications.

Purpose of the Study:

  • To leverage ligand isomerism in amino acids for constructing MOFs for Xe/Kr separation.
  • To investigate the impact of side-chain branching on MOF stability and performance.

Main Methods:

  • Synthesis of two zinc-based MOFs, Zn-LEU and Zn-ILE, using leucine and isoleucine isomers.
  • Characterization of MOF structures and pore environments.
  • Evaluation of Xe/Kr separation performance using dynamic breakthrough experiments under various conditions.

Main Results:

  • Zn-ILE demonstrated higher structural stability compared to Zn-LEU.
  • Zn-ILE exhibited a ~40% increase in Xe uptake and superior Xe/Kr selectivity.
  • Cost-normalized Xe productivity for Zn-ILE was 2.21 × 10⁻³ mmol USD⁻¹, indicating high cost-efficiency.

Conclusions:

  • Ligand isomerism in amino acids is an effective strategy for designing MOFs for gas separation.
  • The Zn-ILE MOF shows promising performance for cost-efficient xenon capture and purification.