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Impact of rolling pressure to remove excess water phase during interfacial polymerization on the thin-film composite polyamide nanofiltration membranes

Authors： LI Zhuangzhi1, HAO Shuang1, QIN Yiwen1, DENG Luyao1, SHI Wenxiong2, HU Yunxia1

Units： 1. State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China; 2. Institute of New Energy Materials and Low-Carbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China

KeyWords： thin-film composite polyamide nanofiltration membrane; interfacial polymerization; rolling pressure; permeability and selectivity

ClassificationCode：

year,volume(issue):pagination： 2023,43(1):56-64

Abstract：

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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AuthorIntro：

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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