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Preparation and performance study of superhydrophilic
polyimide nanofiber membranes

Authors： ZHAO Jingyu1, JIA Fengwei1, ZHANG Yingjie1,2, CHENG Xiquan1,2, WANG Kai1,2

Units： 1. College of Marine Science and Technology, Harbin Institute of Technology (Weihai), Weihai 264209, China; 2. Sino-European Institute of Membrane Technology, Weihai 264209, China

KeyWords： superhydrophilic; nanofibre membranes; oil-water separation; electrospinning

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2025,45(4):162-172

Abstract：

Membrane separation technology, as an efficient method for treating oily wastewater, has shown significant advantages in the field of oil-water separation. However, the large-scale application of this technology is limited by the performance of membrane materials, mainly manifested in insufficient permeation flux and poor anti-pollution performance. In this paper, polyimide (PI) nanofiber membranes were prepared by electrospinning technology, and then coated with γ-glycidoxypropyltrimethoxysilane (KH550) and dopamine to obtain superhydrophilic nanofiber membranes for ultrafast separation of oil-in-water emulsions. The experimental results showed that through surface hydrophilic modification and surface coating with KH550, superhydrophilic polyimide nanofiber oil-water separation membranes with micro-nano hydrophilic structures could be effectively constructed. The surface morphology, chemical composition and wetting properties of the membrane were analyzed in detail by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), contact angle meter (CA) and other characterization methods, verifying its superhydrophilic characteristics. The contact angle of the modified membrane was 8°±1°, and it had excellent anti-pollution performance, with an underwater oil contact angle of 155°±1° and a water droplet passing time through the membrane within 0.5 s. The water flux of the membrane was 18 705 L/(m2·h·MPa), and the oil-water separation efficiency for n-octane emulsion reached 99.4%, achieving excellent superhydrophilic performance and showing strong application prospects in the separation of oil-in-water emulsions.

Funds：

山东省重点研发计划（竞争性创新平台）项目（2023CXPT068）

AuthorIntro：

赵静钰（1999-），女，云南蒙自人，硕士研究生，主要从事纳米纤维膜制备及性能研究

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