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Preparation and performance of hollow fiber loose nanofiltration membranes of PES/PES-OH@TMCCHEN

Authors： Jiwei1,2, LIU Menghao1,2, XU Xin1,2, YIN Xiandong3, WANG Jinliang3, HE Benqiao1,2,4

Units： 1. State Key Laboratory of Advanced Separation Membrane Materials, School of Materials
Science and Engineering, Tiangong University, Tianjin 300387, China; 2. Cangzhou Research
Institute of Tiangong University, Cangzhou 061000, China; 3. CSPC Zhongnuo
Pharmaceutical (Shijiazhuang) Co., Ltd.， Shijiazhuang 050000,China;
4. Clean-Membrane New Material Technology (Hebei) Co., Ltd., Cangzhou 061000,China

KeyWords： loose nanofiltration membrane; non-solvent induced phase separation (NIPS); interfacial crosslinking; “trade-off” effect

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2026, 46(4):98-104

Abstract：

To address the inherent trade-off between permeability and rejection in conventional separation membranes during dye/salt separation, a loose nanofiltration hollow fiber membrane with both high permeability and excellent dye/salt separation performance was fabricated via a non-solvent induced phase separation (NIPS) coupled interfacial crosslinking strategy. First, hollow fiber substrates rich in hydroxyl groups (-OH) (denoted as MX) were prepared by the NIPS method using polyethersulfone (PES) and hydroxylated polyethersulfone (PES-OH) with a mass ratio of 1∶1 at different polymer concentrations (X% represented the mass fraction). Subsequently, interfacial crosslinking between the surface -OH groups of the substrate membrane and trimesoyl chloride (TMC) was carried out to fabricate PES/PES-OH@TMC loose nanofiltration hollow fiber membranes (MTMC-X). The results showed that, compared with the pristine substrate membrane M24, the crosslinked membrane MTMC-24 exhibited significantly enhanced mechanical properties, with the tensile strength increasing from 5.8 MPa to 7.0 MPa and the elongation at break rising from 7.2% to 12.1%. Meanwhile, the membrane pore size decreased from 2.33 nm to 1.42 nm. Notably, the permeability of the MTMC-24 membrane [420 L/(m2·h·MPa)] was three times higher than that of the M27 membrane possessing a comparable rejection toward eriochrome black T dye. These results demonstrate that, compared with the conventional strategy of improving rejection solely by increasing the casting solution concentration, the NIPS-interfacial crosslinking coupling strategy can more effectively mitigate permeability loss while enhancing membrane separation performance, thereby significantly improving both permeability and selectivity. This work provides a new strategy for the fabrication of high-performance loose nanofiltration membranes.

Funds：

国家自然科学基金 (22478303); 河北省科技计划重大项目（26361202D， 262G1203D）

AuthorIntro：

陈继伟(1999-)，男，山东济南人，硕士研究生，研究方向为中空纤维疏松纳滤膜的制备与应用.*通讯作者，王金良，E-mail:wjl800814@126.com；何本桥，E-mail:hebenqiao@tiangong.edu.cn

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