Preparation method of PPSU-based ZIF-8 double-layer film and application thereof in hydrogen separation

By embedding ZIF-8 seeds in a PPSU matrix solution and carrying out a solvothermal reaction, a PPSU-based ZIF-8 bilayer membrane was constructed, solving the processing difficulties and interface defects of ZIF-8 inorganic membranes, achieving efficient hydrogen separation, and improving permeability and selectivity.

CN122399580APending Publication Date: 2026-07-17武夷学院
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
武夷学院
Filing Date
2026-04-30
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing ZIF-8 inorganic substrate membranes suffer from problems such as complex processing technology, high cost, brittleness, and interface defects in gas separation. Traditional polymer membranes are difficult to optimize the trade-off between permeability and selectivity, and the doping effect of ZIF particles is limited.

Method used

A method for preparing PPSU-based ZIF-8 bilayer films was adopted. By embedding ZIF-8 seeds in a PPSU matrix solution and carrying out a solvothermal reaction, combined with spin coating technology, a bilayer film was constructed on an α-Al2O3 support, which enhanced interfacial compatibility and optimized performance.

Benefits of technology

The bonding force between the ZIF-8 separation layer and the polymer support layer was improved, overcoming interface defects and achieving excellent hydrogen separation performance. The hydrogen permeation rate reached 4.76×10-7mol·s-1m-2·pa-1, and the selectivity of H2/CO2, H2/N2 and H2/CH4 reached 7.06, 23.15 and 28.91, respectively.

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Abstract

The application discloses a preparation method of a PPSU-based ZIF-8 double-layer membrane and application of the double-layer membrane in hydrogen separation, and belongs to the technical field of gas separation membranes. The preparation method is as follows: ZIF-8 seeds are embedded in a PPSU matrix solution, then are spin-coated onto the surface of an alpha-Al2O3 carrier to obtain a PPSU-based membrane, and secondary growth of the membrane is carried out through a solvothermal reaction, so that the seeds grow epitaxially, a continuous, dense and defect-free ZIF-8 separation layer is formed on the surface and the near-surface region of the carrier substrate, and the reaction is ended to obtain the double-layer membrane. Through the seed embedding strategy, the interface bonding force between the ZIF-8 layer and the PPSU substrate is significantly enhanced, and the generation of interface defects is effectively inhibited. The double-layer membrane has high permeation flux and high separation selectivity for a H2 / CO2 system, and is particularly suitable for hydrogen separation and purification processes.
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Citation Information

Patent Citations

  • Method for synthesizing ZIF-8 membrane through modification of Zn < 2 + >-coated PEI / PDA and application of ZIF-8 membrane in hydrogen separation

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