A method for the preparation of a porous gel coating useful for oil-water separation

The porous gel coating formed by polyethersulfone, polyvinylpyrrolidone and tannic acid solves the stability and efficiency problems of oil-water separation materials, and realizes efficient oil-water separation, photocatalytic self-cleaning and mist collection, with good resistance to acids, alkalis and salts and mechanical stability.

CN122441302APending Publication Date: 2026-07-24LANZHOU INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LANZHOU INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
Filing Date
2026-05-25
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing oil-water separation materials suffer from problems such as hydrophobic membrane substrates that are prone to fouling, loss of hydrophilic additives, agglomeration of photocatalytic particles, and structural instability, which lead to decreased separation efficiency and short service life.

Method used

A stable three-dimensional gel network was formed using polyethersulfone, polyvinylpyrrolidone, and tannic acid, and then anchored in situ through the coordination of titanium dioxide to prepare a porous gel coating with a hierarchical porous structure. This was combined with a non-solvent-induced phase separation method.

Benefits of technology

A porous gel coating with superhydrophilic and underwater superoleophobic properties was prepared, achieving efficient oil-water separation, photocatalytic self-cleaning and mist collection, and exhibiting good stability under extreme environments.

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Abstract

This invention relates to a method for preparing a porous gel coating suitable for oil-water separation, comprising the following steps: S1, ultrasonically treating the original fabric substrate with anhydrous ethanol to obtain the coating substrate; or, ultrasonically treating a metal substrate with anhydrous ethanol first, followed by ultrasonic treatment with sulfuric acid and immersion in sodium hydroxide solution to obtain the coating substrate; S2, preparing a coating casting solution; S3, immersing the coating substrate in the coating casting solution using a dip-coating method, repeatedly lifting and tilting, allowing excess casting solution to flow out under gravity to obtain the coating liquid substrate; S4, after heat treatment, the coating liquid substrate is rapidly transferred to an aqueous condensation bath to induce phase separation, then washed with deionized water and dried to constant weight to obtain the porous gel coating. This invention features a simple, easy-to-implement, and low-cost process, and the resulting porous gel coating exhibits superhydrophilic / underwater superoleophobic properties, making it applicable to oil-water separation, oil-in-water emulsion separation, photocatalytic self-cleaning and antifouling, and mist collection.
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