膜科学与技术

PVA/PEI复合纳滤膜的制备及性能优化

作者：侯影飞，²，王金凤¹，刘敏¹

单位： 1.中国石油大学（华东）重质油国家重点实验室，青岛266580；2.新疆应用职业技术学院石油与化学工程系，奎屯833200

关键词：聚乙烯亚胺；聚乙烯醇；纳滤膜

出版年,卷(期):页码： 2016,36(6):53-60

摘要：

本文用聚砜超滤膜为底膜，以聚阳离子聚乙烯亚胺（PEI）为阳离子添加剂，与聚乙烯醇（PVA）共混制备带正电复合纳滤膜。讨论了制膜条件对膜性能的影响，并用红外光谱、扫描电镜、接触角对膜的化学组成、表面形态和亲水性进行表征。结果表明随着PEI含量的增加，纳滤膜对二价盐溶液的截留率先增加后减小，最佳制膜条件为：PVA和PEI的质量分数均为2%，PVA与PEI含量比为PVA:PEI=8:1，戊二醛的质量分数为2%，硫酸的质量分数为1%；热处理温度为70℃。此时复合纳滤膜对2 g/L MgSO4溶液的截留率为94.52%，通量为5.91 L/(m2•h)。复合纳滤膜对四种盐截留率大小顺序为：MgSO4>MgCl2>Na2SO4>NaCl。添加PEI后的膜表面电位变大，分离性能增加，亲水性变好，通量增大。

In this paper, the polycationic polyethyleneimine ( PEI) as a cationic additive is blended with polyvinyl alcohol ( PVA) to prepare positively charged composite nanofiltration membrane with polysulfone ultrafiltration membrane as supporting layer. The impact of membrane preparation conditions on membrane performance was discussed. The chemical composition, surface morphology and hydrophilic of the film were characterized by infrared spectroscopy, scanning electron microscopy and the contact angle. The results showed that with the increasing of PEI content, the rejection to divalent salt solution firstly increases and then decreases. The results show that the optimum polymerization condition are as follows: the concentration(mass fraction) of PVA and PEI are 2%, PVA: PEI = 8:1, the concentration of glutaraldehyde is 2%, the concentration of sulfuric acid is 1%, dried temperature is 70℃. The membrane prepared under the optimum conditions exhibited a rejection of 94.52% to 2g/L MgSO4 with flux of 5.91 L/(m2•h). A salt rejection order of MgSO4>MgCl2>Na2SO4>NaCl. After adding PEI to the membrane, surface potential and separation performance of the membrane increases and hydrophilic, flux also increased.

作者简介：侯影飞（1977-），男，籍贯皖，教育程度为博士，现工作于中国石油大学（华东），副教授，研究方向为膜分离，13953223691，houyf@upc.edu.cn

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