Ultrahigh hydrophilic membrane for efficiently and stably separating oil-in-water emulsion

By constructing an ultra-high hydrophilic membrane with a three-dimensional rough structure on a PVDF-based membrane and combining it with magnetically responsive nanoparticles, the problem of easy clogging of membrane materials during long-term separation processes was solved, and an efficient and stable oil-water separation effect was achieved, especially exhibiting excellent separation performance under the action of a magnetic field.

CN120644078APending Publication Date: 2025-09-16NANKAI UNIV
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Patent Information

Application Number
CN202410290453.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-03-14
Publication Date
2025-09-16

AI Technical Summary

Technical Problem

Existing membrane materials are easily clogged by oil adhesion during the long-term separation of oily wastewater, resulting in reduced hydrophilicity, leading to decreased flux and efficiency. In addition, traditional magnetic response materials mainly affect the surface morphology and lack effective regulation of the membrane pore structure.

Method used

A three-dimensional rough ultra-high hydrophilic membrane was constructed on a PVDF-based membrane by electrospinning and in situ growth methods. The magnetic responsiveness of ferrosoferric oxide nanoparticles was combined to optimize the membrane pore structure and enhance the hydrophilicity and stability of the membrane.

Benefits of technology

Highly efficient and stable oil-water separation flux and separation efficiency were achieved. Especially under the action of the magnetic field, the permeation flux of the water-in-oil emulsion reached 8957.9L m-2h-1, the separation efficiency reached 99.87%, and the high efficiency performance was maintained during long-term circulation.

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Abstract

A membrane technology based on a wettability material has the problem of membrane pollution and cannot efficiently and stably separate and purify oil-containing wastewater, so that a preparation method of a hydrophilic membrane with excellent hydrophilicity and an open pore channel is urgently needed. The invention discloses an ultrahigh hydrophilic membrane for efficiently and stably separating an oil-in-water emulsion, which is characterized in that magnetic nanoparticles (Fe3O4 MNPs) are wrapped in membrane fibers through electrostatic spinning and an in-situ growth method, and a hydrophilic polyaniline rough micro-nanosphere structure grows on the surface of the membrane fibers. Under the action of a magnetic field, the magnetic particles obtain magnetism, the generated magnetic interaction force pulls the nanofiber to optimize the membrane structure, and hydrophilic groups are further exposed while membrane holes are supported. The flux of the prepared three-dimensional hydrophilic membrane for separating n-hexane-in-water emulsion under the action of a 0.2 T magnetic field is up to 8957.9 Lm <-2 > h <-1 >, and the efficiency is up to 99.87%. The membrane shows optimal separation performance in short-term and long-term cycle tests, and is expected to be applied to actual oily wastewater purification scenes.
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