Qi Peng, Jia Hongge, Xu Shuangping, Wang Qingji, Su Guiming, Yang Guoxing, Zhang Mingyu, Qu Yanqing, Pei Fuying
College of Chemistry and Chemical Engineering, Heilongjiang Provincial Key Laboratory of Polymeric Composition Material, Qiqihar University, Wenhua Street 42, Qiqihar 161006, China.
CNPC Research Institute of Safety & Environment Technology, Beijing 102206, China.
Membranes (Basel). 2022 Feb 5;12(2):189. doi: 10.3390/membranes12020189.
In this paper, superhydrophilic polyimide (PI) membranes were prepared using the electrostatic spinning method, capped with a hydrophilic ionic liquid (IL), and blended with polyvinylpyrrolidone (PVP). Using this preparation, the surface of the fiber membranes was coated in polydopamine (PDA) by means of an in-growth method. Scanning electron micrographs showed prepared blend films can form continuous fibers, for whom the distributions of diameter and pore were uniform. Post-modification (carried out by adding hydrophilic substances), the ability of the membrane surface to adhere to water was also significantly improved. The water contact angle was reduced from 128.97 ± 3.86° in unmodified PI to 30.26 ± 2.16°. In addition, they displayed a good separation effect on emulsified oil/water mixtures. The membrane flux reached a maximum value of 290 L·m·h, with a maximum separation efficiency reached of more than 99%. After being recycled 10 times, the separation efficiency maintained a level exceeding 95%. The purpose of this study is to demonstrate the simplicity and efficiency of this experiment, thereby providing new ideas for the future application of membrane separation technology in wastewater treatment.
在本文中，采用静电纺丝法制备了超亲水聚酰亚胺（PI）膜，用亲水性离子液体（IL）进行封端，并与聚乙烯吡咯烷酮（PVP）共混。采用这种制备方法，通过内生长法在纤维膜表面包覆聚多巴胺（PDA）。扫描电子显微镜照片显示，制备的共混膜可形成连续纤维，其直径和孔径分布均匀。经过后改性（通过添加亲水性物质进行），膜表面的亲水性也显著提高。水接触角从未改性PI的128.97±3.86°降至30.26±2.16°。此外，它们对乳化油/水混合物显示出良好的分离效果。膜通量达到最大值290 L·m⁻²·h，最大分离效率超过99%。经过10次循环后，分离效率保持在95%以上。本研究的目的是证明该实验的简便性和高效性，从而为膜分离技术在废水处理中的未来应用提供新思路。
