A method for preparing and applying a doped sulfonated polyaniline nanofiltration membrane

By introducing sulfonated polyaniline nanoparticles onto the surface of a nanofiltration membrane and employing a dual crosslinking strategy, the problems of swelling and low flux of polyamide nanofiltration membranes in polar solvents were solved, resulting in the preparation of a nanofiltration membrane with high solvent resistance and flux, enabling deep purification and resource recovery of antibiotic wastewater.

CN121891944BActive Publication Date: 2026-05-26NINGBO RXHL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NINGBO RXHL TECH CO LTD
Filing Date
2026-03-20
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing polyamide nanofiltration membranes are prone to swelling in polar organic solvents, which leads to damage to the pore structure of the separation layer and low membrane flux, making it difficult to meet the requirements for efficient and stable operation in antibiotic wastewater treatment.

Method used

A method for preparing doped sulfonated polyaniline nanofiltration membranes was adopted. Sulfonated polyaniline nanoparticles were introduced onto the surface of the ultrafiltration base membrane, and a dense functional layer was formed by combining primary crosslinking with epoxy crosslinking agent and secondary crosslinking with citric acid, thereby improving the solvent resistance and flux of the membrane.

Benefits of technology

It achieves high retention performance, excellent solvent resistance and high throughput, and can effectively separate and stably treat antibiotic wastewater, combining environmental and economic benefits.

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Abstract

This invention relates to a method for preparing and applying a doped sulfonated polyaniline nanofiltration membrane. The preparation method includes the following steps: first, a surfactant solution is poured onto the surface of an ultrafiltration base membrane and allowed to stand; then, excess liquid is removed and the membrane is dried; next, a doped sulfonated polyaniline solution is uniformly spread onto the membrane surface, and excess liquid is removed by rollers; then, a heat-curing treatment is performed; after heat curing, the membrane is immersed in a citric acid aqueous solution to obtain the doped sulfonated polyaniline nanofiltration membrane. This invention features a simple process, and the prepared nanofiltration membrane exhibits high retention capacity, high flux, and excellent solvent resistance, improving the separation effect and long-term stability of the nanofiltration membrane for different antibiotics.
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