酚酞基聚醚醚酮/聚乙烯亚胺复合超滤膜的制备与性能研究

Preparation and Properties of Phenolphthalein Based Polyetheretherketone/Polyethylenimine Composite Ultrafiltration Membrane

目的 制备纯水通量较高的复合超滤膜,实现染料废水的高效快速分离。方法 采用相分离转化法,以丙酮为非溶剂,酚酞基聚醚醚酮和聚乙烯亚胺为研究对象,在室温条件下,开发出一种性能较好的酚酞基聚醚醚酮/聚乙烯亚胺复合超滤膜;分析酚酞基聚醚醚酮(PEEK-WC)质量分数、聚乙烯亚胺(PEI)添加量、改性反应时间等工艺因素对复合超滤膜性能的影响。结果 随着反应沉积时间的增加,复合超滤膜的水通量呈上升趋势;随着聚乙烯亚胺质量分数增加,复合超滤膜的水通量不断增加;复合超滤膜的最优制备条件为PEI与PEEK-WC的质量比为20%,PEEK-WC与NMP的质量比为15%,反应时间为12 h。结论 酚酞基聚醚醚酮/聚乙烯亚胺复合超滤膜具有良好的截留效果和抗细菌污染性。

The composite ultrafiltration membrane with high pure water flux was prepared to realize efficient and rapid separation of dye wastewater.Using phase separation and conversion method,acetone as non-solvent,phenolphthalein polyetheretherketone and polyethylenimide were used as research objects.A kind of phenolphthalein polyetheretherketone/polyethylenimide composite ultrafiltration membrane with good properties was developed at room temperature.The effects of the mass fraction of phenolphthalein polyetheretherketone(PEEK-WC),the amount of polyethylenimine(PEI)and the modification reaction time on the properties of the composite ultrafiltration membrane were analyzed.With the increase of reaction time,the water flux of the composite ultrafiltration membrane increased.With the increase of polyvinylimide mass fraction,the water flux of composite ultrafiltration membrane increased.The optimum preparation conditions of the composite ultrafiltration membrane are as follows:the mass ratio of PEI to PEEK-WC is 20%,the mass ratio of PEEK-WC to NMP is 15%,and the reaction time is 12 h.Phenolphthalein polyetheretherketone/polyethylenimide composite ultrafiltration membrane has good retention effect and resistance to bacterial contamination.