摘要：

聚偏氟乙烯（PVDF）是一类性能优异的膜材料，但膜表面的疏水性易引发膜污染，阻碍了其在污水处理方面的实际应用。为了提高PVDF的表面亲水性，合成了3种不同粒径的共聚微球，将其与PVDF共混后再在膜表面接枝聚乙烯亚胺，制备了聚乙烯亚胺接枝/微球共混改性PVDF膜。对改性后的PVDF膜进行了FTIR、XPS、SEM、Zeta电位等分析测试，考察了该膜的油水分离性能、抗蛋白质污染性能及对染料的吸附、截留性能。结果表明改性膜具有亲水性和水下疏油性，对油水乳液的分离率在99%以上；具有抗蛋白质污染性，牛血清蛋白过滤后通量恢复率可达99.3%；能够吸附和截留阴离子染料，对刚果红染料的截留率在90%以上。

关键词: 微球, 聚偏氟乙烯膜, 亲水改性, 污水处理

Abstract:

Polyvinylidene fluoride (PVDF) is a kind of membrane material with excellent performance. However, the hydrophobicity of the membrane surface can easily lead to membrane fouling, which hinders its practical application in wastewater treatment. In order to improve the surface hydrophilicity of PVDF, three kinds of copolymer microspheres with different particle sizes were synthesized, and then polyethyleneimine was grafted on the surface of the membrane. The PVDF membrane modified by polyethyleneimine grafting/microsphere blending was tested by FTIR, XPS, SEM, Zeta potential and other analysis tests. The oil-water separation performance, protein contamination resistance, and dye adsorption and retention performance of the membrane were investigated. The results showed that the modified membrane was hydrophilic and oleophobic underwater, and the separation efficiency of oil-water emulsion was above 99%. The membrane was resistant to protein pollution, and the flux recovery rate of bovine serum albumin after filtration could reach 99.3%. It could adsorb and intercept anionic dyes, and the interception rate of Congo red dye was above 90%.

Key words: microspheres, polyvinylidene fluoride membrane, hydrophilic modification, sewage treatment

中图分类号: 

• X703.1