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Preparation of high-flux composite nanofiltration membranes based on interfacial polymerization of cellulose nanocrystals for resistance to organic contamination

Authors： FENG Guizhen， ZHANG Huomei， CHEN Jun， MO Kailin， CUI Zhicheng

Units： School of Civil Engineering and Architecture, East China Jiaotong University

KeyWords： cellulose nanocrystals; interfacial polymerization; composite nanofiltration membranes; anti-contamination

ClassificationCode：TQ028.5

year,volume(issue):pagination： 2025,45(1):20-29

Abstract：

To enhance the permeation separation and antifouling properties of traditional polyamide nanofiltration membranes, hydrophilic cellulose nanocrystals (CNCs) were introduced into the polyamide layer of the nanofiltration membrane through interfacial polymerization, resulting in the preparation of antifouling cellulose nanocrystal composite nanofiltration membranes (TFN-25 membranes). The TFN-25 membranes were characterized using techniques such as scanning electron microscopy (SEM) and Zeta potential measurements. The impact of CNCs on the surface morphology, structure, permeation separation, and antifouling properties of the nanofiltration membranes was investigated. The results demonstrated that the surface of the TFN-25 membrane developed a spherical structure, increased roughness, enhanced hydrophilicity, and a more negative electrical charge. Under an operating pressure of 0.4 MPa, the TFN-25 membrane exhibited a pure water flux of 37.73 L/(m2·h) and a Na2SO4 rejection rate of 96.67%. It maintained good stability during a 21 hours desalination test. The flux recovery rates of the TFN-25 membrane for humic acid, bovine serum albumin, and sodium alginate were 97.80%, 85.05%, and 91.45%, respectively, indicating improved antifouling performance.

Funds：

国家自然科学基金项目（51868019）

AuthorIntro：

丰桂珍（1977-）,女，山东潍坊人，博士，副教授，研究方向为水处理理论与技术

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