Modified tricellulose acetate forward osmosis membrane, preparation method and application

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By covalently binding polyethyleneimine to the surface of the active layer of a cellulose triacetate forward osmosis membrane, the problems of insufficient rejection rate and water flux of existing forward osmosis membranes in wastewater treatment are solved, and efficient separation of Cs+ in radioactive wastewater is achieved.

CN117244403BActive Publication Date: 2026-07-21TSINGHUA UNIVERSITY

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: TSINGHUA UNIVERSITY
Filing Date: 2023-10-31
Publication Date: 2026-07-21

AI Technical Summary

Technical Problem

Existing forward osmosis membranes have limitations in wastewater treatment due to issues such as insufficient retention rate leading to direct discharge of draw solution and low water flux.

Method used

Irradiation allows polyethyleneimine to be covalently bonded to the active layer surface of a cellulose triacetate forward osmosis membrane, forming a modified layer that improves the membrane's stability and durability.

Benefits of technology

Modified cellulose triacetate forward osmosis membranes exhibit significant cation separation performance in radioactive wastewater, especially with high Cs+ rejection rate and long service life.

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Abstract

The application provides a modified tricellulose acetate forward osmosis membrane, a preparation method and application, polyethylene imine is combined on the surface of an active layer of the tricellulose acetate forward osmosis membrane in a covalent bond mode through irradiation, and the modification method is simple and effective; the application also provides a modified tricellulose acetate forward osmosis membrane, in the modified tricellulose acetate forward osmosis membrane, the combination of the modified layer and the original active layer of the membrane is more stable and durable, and the service life is long; and the application also provides an application of the modified tricellulose acetate forward osmosis membrane, which has achieved remarkable advantages in effectively separating nuclide ions (especially Cs + ).

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