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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

447
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...
447

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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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Designing Metal-Organic Framework (MOF) Membranes for Isomer Separation.

Shenzhen Cong1,2, Yunqi Zhou1,2, Chenglian Luo1,2

  • 1Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.

Angewandte Chemie (International Ed. in English)
|January 24, 2024
PubMed
Summary

This study demonstrates how precisely tuning metal-organic framework (MOF) membrane pore sizes enables efficient separation of hydrocarbon isomers like xylenes and alkanes, offering a low-carbon footprint solution.

Keywords:
MOF membranesUiO-66hydrocarbonisomer separation

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Membrane-based separation offers a sustainable, low-carbon footprint alternative for chemical processing.
  • Separating hydrocarbon isomers efficiently is crucial for the petrochemical industry.
  • Metal-Organic Frameworks (MOFs) present tunable structures for advanced separation applications.

Purpose of the Study:

  • To rationally design the pore size of metal-organic framework (MOF) membranes for discriminating various hydrocarbon isomers.
  • To develop MOF membranes capable of separating challenging isomer pairs.
  • To explore structure-property relationships in MOFs for tailored separation performance.

Main Methods:

  • Fabrication of Zr-MOF UiO-66 membranes for p/o-xylene separation.
  • Modification of UiO-66 ligand functional groups and proportions to create UiO-66-33Br membranes for n-hexane/2-methylpentane separation.
  • Synthesis of MOF-801 membranes using shorter ligands for n/i-butane separation.

Main Results:

  • UiO-66 membranes exhibited suitable pore sizes for effective p/o-xylene separation.
  • UiO-66-33Br membranes demonstrated tunable pore sizes for n-hexane/2-methylpentane discrimination.
  • MOF-801 membranes with smaller pores were successfully fabricated for n/i-butane separation.

Conclusions:

  • Rationally designed MOF membranes, including UiO-66 and MOF-801, are effective for separating hydrocarbon isomers.
  • Tuning MOF pore size through ligand modification is a viable strategy for isomer separation.
  • These MOF membranes offer a promising low-carbon footprint approach for industrial separations.