A honeycomb-like nanofiber membrane for separating emulsified oil in water and a method for preparing the same

By preparing a honeycomb-like TiO2/PPy/BiOX nanofiber membrane, the cavity turbulence effect is used to increase the probability of oil droplet collision and photocatalytic degradation of oil, which solves the problems of low separation efficiency and poor antifouling of nanofiber membranes, and achieves high-efficiency separation and long-life oil-water separation effect.

CN117504611BActive Publication Date: 2026-07-24JIANGNAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JIANGNAN UNIV
Filing Date
2023-10-26
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing nanofiber membranes are inefficient and have poor antifouling properties when separating emulsified oil in water. Traditional electrospun fiber membranes have an average pore size greater than 2μm and cannot separate emulsified oil with smaller particle size. In addition, fiber membranes are easily fouled and have poor antifouling properties.

Method used

A honeycomb-like nanofiber membrane was prepared using a TiO2/PPy/BiOX structure. The membrane was formed with a semi-closed cavity through electrospinning, calcination, in-situ polymerization, and continuous ion layer adsorption reaction. The cavity turbulence effect was used to increase the probability of oil droplet collision, and the antifouling property was improved by photocatalysis.

Benefits of technology

It achieves efficient separation of emulsified oil with a particle size of less than 1 μm, with a separation efficiency of more than 99%. The fiber membrane recovers more than 99.9% after being contaminated under visible light irradiation, which significantly improves the service life of the membrane.

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Abstract

The application discloses a kind of honeycomb-like nanofiber membrane for separating emulsified oil in water and a preparation method thereof, and belongs to the technical field of functional micro-nanofiber materials.The preparation of the honeycomb-like nanofiber membrane of the application is to first form a TiO2 nanofiber membrane, then immerse the TiO2 nanofiber membrane in a pyrrole solution, and then add a FeCl3 solution for reaction to obtain a TiO2 / PPy nanofiber membrane; finally, immerse the TiO2 / PPy nanofiber membrane in an aqueous solution of Bi(NO3)3·5H2O and an aqueous solution of KX for reaction, respectively, and after 2-6 SILAR cycles, obtain a honeycomb-like TiO2 / PPy / BiOX nanofiber membrane; the honeycomb-like nanofiber membrane not only has a high emulsion separation effect, but also solves the problems of low oil stain degradation efficiency and poor stain resistance of traditional membranes, significantly improving the service life of the nanofiber membrane.
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