聚酰胺/聚砜中空纤维复合膜的研究

Study on polyamide / polysulfone hollow fiber composite membrane

采用不同种类的醇对聚砜中空纤维基膜进行预处理,选用经过乙醇预处理的基膜制备聚酰胺/聚砜中空纤维复合膜,研究了醇处理对膜性能的影响.并在此基础上分析操作压力、原液质量浓度等操作条件对复合膜性能的影响,考察复合膜对不同物质的分离效果.研究结果表明:采用乙醇预处理基膜可以显著提高复合膜的性能;复合膜通量和截留率随操作压力提高而提高,随原液浓度提高而下降;复合膜对二价或多价离子和相对分子质量大于300的物质均有较好的截留效果.

Polysulfone （PSf） hollow fiber substrate membrane was pretreated with different kinds of alcohols. Moreover, the membrane which was pretreated with ethanol was chosen as substrate and a polyamide/polysulfone hollow fiber composite membrane was prepared to study the effect of pretreatment on the performances of membrane. Then the effects of operating conditions such as operating pressure, and the concentration of original solution on the performances of composite membrane were analyzed, and separating performance of composite membrane for different substances was studied. The results show that the substrate pretreated with ethanol can remarkably improve the performance of composite membrane, and the flux and rejection of composite membrane increase with operating pressure increasing or the concentration of original solution decreasing, and the composite membrane has a good rejection to multi-valent ions and substance with molecular weight higher than 300.