Preparation and application of a "hourglass type" covalent organic framework composite membrane

By stacking covalent organic framework nanosheets with different pore sizes and charges using a vacuum-assisted self-assembly method, an "hourglass-shaped" covalent organic framework composite membrane was prepared, which solved the problem of low gas separation selectivity of COF membranes and achieved efficient H2/CO2 separation.

CN119633617BActive Publication Date: 2026-06-09HUNAN UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
HUNAN UNIV
Filing Date
2025-01-15
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing covalent organic framework (COF) membranes suffer from low gas separation selectivity due to their large pore size, making it difficult to effectively screen gas molecules of different sizes. Furthermore, traditional modification methods are difficult to synthesize and present numerous challenges in their preparation.

Method used

Covalent organic framework nanosheets with different pore sizes and charge properties were stacked layer by layer using a vacuum-assisted self-assembly method to form an "hourglass-shaped" covalent organic framework composite membrane. A dense and uniform membrane structure was then constructed using vacuum filtration technology.

Benefits of technology

It achieves gas separation with high permeability and high selectivity, reduces the risk of gas leakage, has controllable structure and environmental friendliness, and is suitable for H2/CO2 separation.

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Abstract

The application provides a preparation method of a "hourglass type" covalent organic framework (COF) composite membrane, and belongs to the field of gas membrane separation. The method uses covalent organic framework nanosheets with different pore diameters and charge characteristics, and constructs a COF composite membrane with a unique "hourglass" structure through a vacuum-assisted layer-by-layer assembly technology, so that the transmission behavior of H2 and CO2 gas is accurately controlled. The prepared composite membrane has significant H2 / CO2 separation selectivity and high permeation flux, and has excellent chemical stability, thermal stability and mechanical flexibility. The application provides a novel solution for efficient gas separation and energy storage applications.
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