膜科学与技术

预处理对聚多巴胺改性聚丙烯微滤膜性能影响研究

作者：周蓉，任鹏飞，徐志康

单位：浙江大学浙江大学高分子科学与工程学系，高分子合成与功能构造教育部重点实验室，杭州 310027

关键词：聚多巴胺；聚丙烯微孔膜；乙醇浸润预处理；等离子体预处理

出版年,卷(期):页码： 2015,35(1):56-63

摘要：

为改善聚多巴胺对聚丙烯微滤膜表面及孔道的改性效果，本文分别采用等离子体及乙醇浸润法对微滤膜进行预处理，并对比了两种方法对聚多巴胺沉积量、膜纯水通量及表面形貌的影响。沉积密度和水通量测试表明，相对于等离子体法，乙醇预浸润法可以更好地改善聚多巴胺在微孔膜内的沉积行为。表面衰减全反射红外(ATR/FT-IR)、X射线光电子能谱(XPS)和场发射扫描电镜(FESEM)结果证实聚多巴胺可有效改性乙醇预浸润膜。能量色散X射线光谱(EDX)分析显示聚多巴胺完整且均匀地分布于膜孔道中。改性膜在为期27天的测试中表现出了较好的稳定性。此外，动态蛋白过滤实验表明，改性后膜的抗污染性能得到显著提升。

Plasma and ethanol pretreatment methods were used, respectively,to improve thedeposition of polydopamine(PDA) on the surface and in the pores ofpolypropylene microfiltration membrane. Detail comparison was made between the two methods through deposited density, membrane morphology and pure water flux. Results of deposition density and water permeation show that the ethanol pretreatment method is better than the plasma one in improving the deposition behavior of PDA for this kind ofmembrane. ATR/FT-IR, XPS and FESEM analyses confirm that after ethanol pretreatment, PDA can modify the membranes much more efficiently. EDX resultindicates PDA is uniformly distributed throughout the membrane. The performance of the modified membranes can last stable as long as 27 days. What’s more, the antifouling property can also be improved after PDA modification, revealed by the results of dynamic protein filtration experiments.

周蓉（1989-），女，江苏盐城，硕士研究生，主要从事膜材料改性及性能研究。

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