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Oxidation-resistant modification of polypropylene hollow fiber membranes and membrane distillation applications

Authors： Hui Wang1, 2, Jun Xiang1, 2, Yifang Gao1,2, Guiying Tian1, 2, Lei Zhang1,2, Penggao Cheng1,2, Jianping Zhang1,2, Na Tang

Units： 1. College of Chemical Engineering and Materials Science, Tianjin university of science and technology, Tianjin 300457, China;2. Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization, Tianjin 300457, China

KeyWords： Hollow fiber membrane; polypropylene modification; antioxidant; retention rate; membrane distillation

ClassificationCode：TQ031

year,volume(issue):pagination： 2024,44(1):80-90

Abstract：

Currently, polypropylene hollow fiber membranes (PP-HFM) are widely used in water purification, sewage pretreatment, pharmaceutical purification separation, beverage and wine concentration, and industrial waste liquid recycling. To improve the oxidation resistance and service life of polypropylene membranes, in this study, it was conducted to prepare high-performance PP-HFMs by adding antioxidants and modifying the purification process. This work specifically explores the effect of optimal antioxidant addition on membrane oxidation resistance. In the oxidation experiment over 36 h, the addition of 0.4% antioxidant 1076 can obviously increase the water contact angle of polypropylene hollow fiber membrane by 67%, while the tensile strength is reduced by 10% and the maximum elongation is reduced by 15%. In the membrane distillation experiment, the oxidation-resistant PP-HFM can operate stably for more than 36 h. The rejection of the PP-HFM membrane can still retain 99.7% of Al3+ after 30 h operation. In conclusion, the addition of antioxidant improves the retention stability and service life of PP-HFMs in the membrane distillation application.

Funds：

国家重点研发计划(2022YEC2904005);营口科技发展计划(2020103)

AuthorIntro：

王辉(1999-),男,黑龙江省,硕士研究生,从事中空纤维膜分离研究

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