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Polypropylene Hollow Fiber Nanofiltration Membrane Made by DIP Method

Authors： Zhong-yong Qiu, Chun-ju He

Units： The State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University Shanghai, 201620

KeyWords： Nanofiltration membrane, Polypropylene, Hollow fiber membrane, Dye filtration

ClassificationCode：TQ051.893

year,volume(issue):pagination： 2022,42(3):7-14

Abstract：

Facing the blank of polypropylene nanofiltration membrane preparation technology, we used the dissolution-induced pore method to blend the polypropylene with polyethylene oxide as the pore-forming agent, and extruded through a twin-screw extruder. The non-composite polypropylene hollow fiber nanofiltration membrane was processed for the first time through the processes of, air cooling, filament winding and water washing。In order to further improve the filtration flux and hydrophilic antifouling ability of the hollow fiber membrane, hydrophilic silica nanoparticles were embedded in the wall of the hollow fiber membrane by melt blending. And to reduce emissions and reduce costs, the experiment tried to recycle and reuse the porogen polyethylene oxide. The raw fiber was soaked and extracted with water. The best recovered water/polyethylene oxide mass ratio and leaching time were investigated in detail. At the same time, to verify the stability of the polypropylene hollow fiber membrane, methyl blue and acid red were used as the retention material for a long period test of 60 hours. The results show that the polypropylene hollow fiber nanofiltration membrane has a stable flux for the rejection of methyl blue and acid red. Compared with the hollow fiber membrane without the addition of hydrophilic nano silica particles, the rejection of the modified membrane is 100%, and the flux is as high as 39 L/(m2·h·0.1MPa). At the same time, the recovery rate of the porogen under the optimal conditions is also as high as 99%, which provides a theoretical and theoretical basis for the closed-loop utilization of polyethylene oxide. The experimental results prove that the dissolution-induced pore-forming method with polyethylene oxide as the porogen is a stable, efficient and recyclable polypropylene hollow fiber nanofiltration membrane preparation method.

Funds：

国家自然科学基金（51873034）；中央高校基本科研业务费专项资金、东华大学研究生创新基金资助（CUSF-DH-D-2019021）

AuthorIntro：

邱中勇（1989-），男，博士，滤膜方向，E-mail：1661799127@qq.com

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