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基于纤维素纳米晶体界面聚合制备抗有机污染的高通量复合纳滤膜

作者：丰桂珍，张火梅，陈俊，莫凯琳，崔志成

单位：华东交通大学土木建筑学院

关键词：纤维素纳米晶体；界面聚合；复合纳滤膜；抗污染

DOI号： 10.16159/j.cnki.issn1007-8924.2025.01.003

分类号： TQ028.5

出版年,卷(期):页码： 2025,45(1):20-29

摘要：

为改善传统聚酰胺纳滤膜的渗透分离和抗污染性能，将亲水性纤维素纳米晶体 (CNCs)通过界面聚合反应引入纳滤膜聚酰胺层，制备了抗污染的纤维素纳米晶体复合纳滤膜 (TFN-25膜).利用扫描电镜、Zeta电位等手段对TFN-25膜进行表征，并研究CNCs对纳滤膜表面形貌、结构、渗透分离和抗污染性能的影响.结果表明，TFN-25膜表面形成了球状结构，粗糙度增大，亲水性和电负性增强；在0.4 MPa的操作压力下，TFN-25膜的纯水通量为37.73 L/(m2·h)，Na2SO4截留率为96.67%；在21 h脱盐实验中保持良好的稳定性；TFN-25膜对腐殖酸、牛血清蛋白和海藻酸钠的通量恢复率分别为97.80%、85.05%和91.45%，抗污染性能有所提升.

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.

基金项目：

国家自然科学基金项目（51868019）

作者简介：

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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