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Preparation and performance study of asymmetric dual-layer polyamide nanofiltration membranes by one-step free interfacial polymerization

Authors： FU Xinyu, WANG Jianqiang, JI Yanli, LIU Fu

Units： 1. Center for Membrane Separation and Water Science & Technology, Zhejiang University of Technology, Hangzhou?310014,?China; 2. Ningbo?Institute?of?Materials?Technology?&?Engineering,?Chinese?Academy?of?Sciences, Ningbo?315201,?China; 3.University?of?Chinese?Academy?of?Sciences,?Beijing?100049,?China

KeyWords： asymmetric polyamide; dual-layer polyamide; interfacial polymerization; nanofiltration

ClassificationCode：O63

year,volume(issue):pagination： 2023,43(5):50-57

Abstract：

Thin film composite (TFC) nanofiltration membranes are widely used in the field of water treatment as a new membrane separation technology. Reducing the thickness of the polyamide separation layer is beneficial for enhancing the permeability of TFC nanofiltration membranes. However, the practical application of TFC nanofiltration membranes with an ultra-thin polyamide layer still faces great challenges. Here, we propose a strategy for the preparation of asymmetric dual-layer polyamide nanofiltration membranes by one-step free interfacial polymerization. The resulting asymmetric dual-layer polyamide nanofiltration membranes have a thin, smooth and dense top polyamide separation layer, while the corresponding bottom polyamide separation layer is relatively thick, rough and sparse. The thin and dense top polyamide layer results in a relatively high water permeability (18.5±1.0 L m-2 h-1 bar-1) and high retention (Na2SO4, 97.2±0.8%), while the thicker and looser bottom polyamide layer results in a long-term operational stability. This study provides a promising preparation strategy for improving the separation performance of polyamide composite membranes.

Funds：

宁波市自然科学基金重点项目（202003N4031）；中科院国际伙伴计划—全球共性挑战专项(181GJHZ2022038GC)

AuthorIntro：

付欣宇（1995-），女，山西朔州，硕士，从事纳滤膜及其性能研究，E-mail：fuxinyu@nimte.ac.cn.

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