Ultrafiltration membrane based on hydrogen bond driven network compound, preparation method and application

By assembling a dynamic cross-linked network layer of tannic acid/cellulose nanofibers on the surface of a microfiltration membrane and forming a reversible gel layer using hydrogen bond self-assembly technology, the problem of ultrafiltration membrane fouling is solved, achieving efficient membrane regeneration and performance recovery, and is suitable for a variety of commercial microfiltration substrates.

CN122441272APending Publication Date: 2026-07-24NANJING TECH UNIVERSITY SUZHOU FUTURE MEMBRANE TECHNOLOGY INNOVATION CENTER +1
0 Cites 0 Cited by

Patent Information

Application Number
CN202610899092.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-22
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing ultrafiltration membranes are easily fouled during use, leading to flux decline and membrane performance degradation. Furthermore, traditional modification methods are complex, costly, and difficult to achieve efficient membrane regeneration and recycling.

Method used

A dynamic cross-linked network layer of tannic acid/cellulose nanofibers was assembled on the surface and within the pores of a microfiltration membrane using a vacuum filtration method. A reversible gel layer was formed using hydrogen bond self-assembly technology, and the membrane was regenerated and its performance was restored by immersion in pure water.

Benefits of technology

It achieves high-efficiency retention and contaminant removal performance of ultrafiltration membranes, with a membrane performance recovery rate of over 95%, extending membrane lifespan, reducing operating costs, and is suitable for a variety of commercial microfiltration substrates.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention discloses an ultrafiltration membrane based on a hydrogen bond driven network compound, a preparation method and application. Aiming at the problems that an existing microfiltration membrane is insufficient in separation precision and an ultrafiltration membrane is difficult to clean due to pollution, a hydrogen bond self-assembled tannic acid / cellulose nanofiber dynamic cross-linked network layer is constructed on the surface and in a pore channel of a polyethersulfone, polyvinylidene fluoride or polyamide microfiltration membrane in situ by adopting a vacuum suction filtration method, and the microfiltration membrane is upgraded into the ultrafiltration membrane by a one-step method. The dynamic gel layer can be dissolved under the condition of pure water soaking, pollutants are synchronously removed and adsorbed, the membrane is recovered to a microfiltration state, and performance regeneration can be realized through suction filtration and assembly again. The retention rate of the obtained composite membrane on bovine serum albumin can reach 95% or above, the retention rate on humic acid is increased by 40-60%, and the flux recovery rate exceeds 95%. According to the method, a chemical cross-linking agent is not needed, the process is simple and green, the used materials are natural and degradable, and the method shows excellent reversible regeneration performance and cost advantages in biopharmaceutical separation, natural organic matter removal and batch type water treatment.
Need to check novelty before this filing date? Find Prior Art