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Study on substrate layer modification and its effects on the performance
 of reverse osmosis composite membranes
Authors： KUANG Wu, HAN Hongrui, YI Gang, SU Zhipeng, LI wei, LU Yanbin
Units： Beijing OriginWater Membrane Technology Co., Ltd., Beijing  101407， China
KeyWords： support layer; pore structure; porosity; polyamide; composite membrane
ClassificationCode：TQ028.8
year,volume(issue):pagination： 2026, 46(3):42-52

Abstract：

The separation efficiency and pressure resistance of reverse osmosis composite membranes strongly depend on the microporous structure of the polysulfone support membrane, yet the precise control mechanism of fabrication parameters on pore structure remains unclear. In this study, polysulfone support membranes were prepared via the non solvent induced phase separation method. The effects of ambient humidity, coagulation bath composition and temperature, and non solvent additive in the casting solution on the pore structure were systematically investigated, followed by the preparation of polyamide composite membranes via interfacial polymerization. The results showed that when the water content in the casting solution was 1.0%, the composite membrane achieved a flux of 60.16 L/(m2·h) and a salt rejection of 99.7% when tested with 2 000 mg/L NaCl solution under 1.55 MPa. After 20 h of continuous operation at 5.86 MPa, the flux decline was only 16.9%, while the salt rejection remained stable. This study demonstrates that precise regulation of support membrane formation conditions can balance permeability and pressure resistance, providing a new route for designing high flux and high stability reverse osmosis membranes. 

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AuthorIntro：
第一作者简介： 况武（1989-），男，江西高安人，博士，高级工程师，主要从事反渗透、纳滤、电解水制氢等膜材料的研发及规模化制备,E-mail：bsy_kuangwu@126.com

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