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Related Concept Videos

Optimizing Chromatographic Separations01:15

Optimizing Chromatographic Separations

Optimizing chromatographic separations is crucial for obtaining clean separations in a minimum amount of time. Optimization is required for several factors, including kinetic effects related to band broadening, plate height, capacity factor, and separation factor.
Band broadening refers to spreading solute bands as they travel through the column. This broadening can impact resolution. Plate height (H) represents the length required for one theoretical plate. A lower plate height corresponds to...
Size-Exclusion Chromatography01:08

Size-Exclusion Chromatography

In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
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Ion Exchange01:17

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 basic...
Extraction: Advanced Methods00:56

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 1, 2026

Synthesis and Characterization of Functionalized Metal-organic Frameworks
11:27

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Published on: September 5, 2014

Functional Chain Engineering in MOFs: Balancing Pore Size and Affinity for Noble Gas Separation.

Kyu-Min Ryoum1, Jihyun Park2, Kwang Hyun Oh1,3

  • 1Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, Republic of Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|May 30, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed new metal-organic frameworks (MOFs) for efficient xenon (Xe) and krypton (Kr) separation. The optimized MOF, ML-80C8, shows high Xe uptake and selectivity, crucial for noble gas separation technologies.

Keywords:
Xe/Kr separationalkoxy chainsmetal–organic framework (MOF)mixed‐ligand strategypore engineering

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Separation Science

Background:

  • Efficient separation of xenon (Xe) from krypton (Kr) is critical for various applications.
  • Adsorbent materials with tailored pore environments are needed to enhance Xe adsorption via van der Waals interactions.
  • Metal-organic frameworks (MOFs) offer tunable structures for gas separation challenges.

Purpose of the Study:

  • To synthesize and investigate a series of mixed-ligand MOFs for selective Xe/Kr separation.
  • To optimize pore size and environment within MOFs for enhanced Xe adsorption.
  • To evaluate the performance of ML-80C8 as a selective adsorbent for Xe/Kr mixtures.

Main Methods:

  • A mixed-ligand strategy was employed to synthesize five MOFs based on the IRMOF-1 framework.
  • Varying ratios of terephthalic acid (BDC) and 2,5-bis(octyloxy)-1,4-benzenedicarboxylic acid (C8BDC) were used to tune pore size.
  • Gas adsorption isotherms and dynamic mixture separation experiments were conducted to assess performance.

Main Results:

  • Increasing C8BDC content progressively reduced MOF pore size, with ML-80C8 (80% C8BDC) showing optimal pore characteristics.
  • ML-80C8 achieved a high Xe uptake of 0.96 mmol g⁻¹ and a Xe/Kr selectivity of 12.1.
  • The material demonstrated excellent separation performance under dynamic conditions, stability, and regenerability.

Conclusions:

  • Mixed-ligand MOFs provide a viable route for designing tailored pore environments for selective noble gas separation.
  • ML-80C8 exhibits superior Xe/Kr separation performance, comparable to benchmark MOFs.
  • This study highlights the potential of MOFs in advancing Xe/Kr separation technologies.