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去除水相的辊压力度对界面聚合制备聚酰胺纳滤膜的影响

作者：厉壮志，郝爽，秦一文，邓璐遥，匙文雄，胡云霞

单位： 1.天津工业大学材料科学与工程学院，分离膜与膜过程国家重点实验室，天津 300387； 2.天津理工大学新能源材料与低碳技术研究院，材料科学与工程学院，天津 300384

关键词：薄层复合聚酰胺纳滤膜；界面聚合；辊压力度；渗透选择性

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出版年,卷(期):页码： 2023,43(1):56-64

摘要：

界面聚合过程中去除水相时的辊压力度大小对生成聚酰胺（PA）层的结构与性能有着重要影响，然而辊压力度的选择通常仅根据经验而未定量化。本研究在界面聚合制备薄层复合聚酰胺纳滤（TFC NF）膜时选用0、10、20、30、50 N共5种去除水相的辊压力度，探究辊压力度对PA层结构和TFC NF膜渗透选择性及机械性能的影响规律。结果表明，当辊压力度从10 N增加至50 N时，哌嗪渗入基底孔内的深度增加，界面聚合倾向于在孔内更深的位置发生，进而导致基底孔内PA厚度增加，水传质阻力升高，TFC NF膜水渗透系数降低。当辊压力度为10 N时，所制得的TFC NF膜的综合性能最为优异，膜的水渗透系数达120.3 L/(m2 h MPa)，高于辊压力度为0 N时的100.8 L/(m2 h MPa)与20 N时的115.8 L/(m2 h MPa)，一/二价离子的分离因子为14.9，高于辊压力度为0 N时的13.8与20 N时的14.2，同时保持较好的机械性能。本工作通过调节界面聚合去除水相的辊压力度，实现了对TFC NF膜渗透选择性的调控，为制备高性能TFC NF膜提供借鉴。

The rolling pressure has a significant effect on the structure and properties of polyamide (PA) layer produced by interfacial polymerization when removing the water phase during the interfacial polymerization process. However, the choice of rolling pressure is usually only empirical and not quantified. In this study, five rolling pressures of 0, 10, 20, 30, and 50 N were used to remove the water phase during the preparation of thin-film composite nanofiltration (TFC NF) membrane by interfacial polymerization, and the effects of rolling pressure on the structure of PA layer and the permeability, selectivity and mechanical properties of TFC NF membrane were investigated. The results show that when the rolling pressure is increased from 10 N to 50 N, the depth of the penetration of PIP into the pores of the substrate increases, and the interfacial polymerization tends to occur at a deeper position inside the pores, which in turn leads to an increase of the thickness of PA in the pores of substrate, an increase of water transport resistance and a decrease of the water permeability of TFC NF membrane. When the rolling pressure is 10 N, the TFC NF membrane (TFC-F10) shows a best overall performance. The water permeability of TFC-F10 membrane reaches 120.3 L/(m2 h MPa), which is higher than 100.8 L/(m2 h MPa) when rolling pressure is 0 N and 115.8 L/(m2 h MPa) when rolling pressure is 20 N, and the separation factor of mono/divalent ion is 14.9, which is higher than 13.8 at 0 N and 14.2 at 20 N, while maintaining good mechanical properties. In this work, the permeability and selectivity of TFC NF membranes are regulated by adjusting the rolling pressure for removing the water phase during interfacial polymerization, which provides reference for the preparation of high-performance TFC NF membranes.

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作者简介：

厉壮志（1997-），男，山东滨州人，硕士生，研究方向为薄层复合聚酰胺纳滤膜的结构调控

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