膜科学与技术

聚丙烯中空纤维膜耐氧化改性及膜蒸馏应用用研究

作者：王辉，项军，高一方，田桂英，张蕾，程鹏高，张建平，唐娜

单位： 1.天津科技大学化工与材料学院,天津 300457；2.天津市卤水化工与资源生态化利用重点实验室,天津 300457

关键词：中空纤维膜；聚丙烯改性；抗氧剂；截留率；膜蒸馏

出版年,卷(期):页码： 2024,44(1):80-90

摘要：

聚丙烯中空纤维膜在纯水预处理、制药纯化分离、饮料酒水浓缩、工业废液回收等领域有广泛的采用.为了提高聚丙烯基中空纤维膜的耐氧化性与使用寿命,本研究通过添加抗氧剂和改进成型工艺来制备高性能聚丙烯中空纤维膜.具体探讨了最佳抗氧剂添加量对膜抗氧化性的影响,经过氧化实验36 h后,添加0.4%抗氧剂1076可使聚丙烯中空纤维膜的水接触角提高67%,同时拉伸强度降低10%,最大伸长率降低15%.在膜蒸馏实验中,耐氧化聚丙烯中空纤维膜可以稳定运行36 h以上.耐氧化改性膜在运行30 h后,对Al3+的截留率依旧可达99.7%.总之,抗氧剂的添加显著提高了聚丙烯中空纤维膜在膜蒸馏应用中的截留性质和使用寿命.

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.

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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