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MOF808-(NH2)改性聚酰胺纳滤膜的制备及其性能研究

作者：王紫薇¹，沈玥¹，王涛¹，²，冯英楠¹，赵之平¹

单位： 1. 北京理工大学化学与化工学院，北京 102488； 2. 北京理工大学唐山研究院，唐山 063000

关键词： MOF-808(NH2)；绿色合成；界面聚合；纳米复合纳滤膜；高渗透率

DOI号： 10.16159/j.cnki.issn1007-8924.2025.03.002

分类号： TQ028.8

出版年,卷(期):页码： 2025,45(3):9-22

摘要：

金属有机框架材料（MOFs）因其规整孔道结构、聚合物相容性和高比表面积等特性，在纳滤膜功能化改性领域展现出显著优势，但其应用仍受限于纳米分散稳定性及绿色制备等关键挑战。本研究选取具有优异水稳定性的MOF-808作为改性纳米材料，采用两步法绿色合成工艺制备了粒径约60 nm、比表面积达1 702 m2/g的MOF-808粒子，并通过氨基修饰获得MOF-808(NH2)。基于预沉积辅助界面聚合，成功构建了MOF-808(NH2)改性聚酰胺纳米复合膜。结果表明：MOF-808(NH2)负载量增加促使膜表面形貌从结节结构向颗粒聚集态转变，粗糙度提升，亲水性增强。优化后的NF-2膜[MOF808(NH2)负载量3.18 μg/cm2]表现出优异渗透选择性，水通量达177.15 L/(m2·h·MPa)，同时对Na2SO4和NaCl的截留率分别达到95.06%和19.24%。在100 h连续运行测试中，NF-2膜表现出优异的长期稳定性。本研究发展的功能化MOFs定向修饰策略，为高性能TFN膜的理性设计与制备提供了新的调控路径。

Metal-organic framework materials (MOFs) have shown remarkable advantages in the field of functional modification of nanofiltration membranes because of their regular pore structure, polymer compatibility and high specific surface area, but their application is still limited by key challenges such as nano-dispersion stability and green preparation. In this study, MOF808 with excellent water stability was selected as a modified nano-material. MOF808 particles with a particle size of about 60 nm and a specific surface area of 1 702 m2/g were prepared by a two-step green synthesis process, and MOF808(NH2) was obtained by amino modification. Based on pre-deposition assisted interfacial polymerization, MOF808(NH2) modified polyamide nanocomposites were successfully constructed. The results showed that the increase of MOF808(NH2) loading promoted the change of membrane surface morphology from nodular structure to particle aggregation state, and the roughness and hydrophilicity were improved. The optimized NF2 membrane [MOF808(NH2) loading of 3.18 μg/cm2] showed excellent permeation selectivity, with a water flux of 177.15 L/(m2·h·MPa), and the rejection rates of Na2SO4 and NaCl reached 95.06% and 19.24% respectively. NF2 membrane showed excellent long-term stability in 100 hours of continuous operation test. The directional modification strategy of functionalized MOFs developed in this study provides a new regulatory path for the rational design and preparation of high-performance TFN membrane.

基金项目：

国家自然科学基金面上项目(52370063)；河北省自然科学基金面上项目（B2022105012）

作者简介：

王紫薇（1999-），女，河北保定人，硕士研究生，从事纳滤膜制备及应用研究

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