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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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Metallocene-anchor inducing oriented MOF membrane for helium separation.

Ju Bai1,2,3, Luqi Xiao1, Xiangping Zhang1,3,4

  • 1Beijing Key Laboratory of Solid State Battery and Energy Storage Process, State Key Laboratory of Mesoscience and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, PR China.

Nature Communications
|October 28, 2025
PubMed
Summary
This summary is machine-generated.

Oriented metal-organic framework (MOF) membranes were synthesized using a novel metallocene-anchor strategy for efficient helium separation. This breakthrough enables high-performance helium/methane separation and concentration, surpassing existing membrane technologies.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Oriented metal-organic framework (MOF) membranes are crucial for helium (He) separation but challenging to synthesize.
  • Existing MOF membranes often struggle to meet high selectivity and permeance requirements for efficient He/CH4 separation.

Purpose of the Study:

  • To develop a novel method for synthesizing oriented MOF membranes for advanced helium separation.
  • To achieve high-performance He/CH4 separation exceeding the Robeson upper bound.
  • To demonstrate the robustness and scalability of the developed membrane technology.

Main Methods:

  • Preparation of an oriented MOF membrane using a metal-organic polyhedra (MOP) fragment as a metallocene-anchor.
  • Induction of {001}-oriented Zr-MOF growth along the c-axis via the metallocene-anchor.
  • Characterization of membrane orientation, separation performance, and stability under various conditions.

Main Results:

  • Achieved precise He/CH4 separation with a selectivity of 77.3 and a He permeance of 695.1 GPU.
  • Demonstrated exceptional membrane robustness against high pressure (40 bar), thermal shock (-25°C to 85°C), and long-term operation (1000 h).
  • A three-stage membrane process successfully concentrated He from 0.3% to 99.9%.

Conclusions:

  • The metallocene-anchor strategy provides a universal approach for fabricating various oriented MOF membranes.
  • The developed MOF membranes offer superior performance for helium separation, surpassing existing technologies and the Robeson upper bound.
  • This work highlights the significant potential of oriented MOF membranes for industrial helium extraction.