Preparation of PVDF composite ultrafiltration membrane by semi-IPN method

doi:10.16085/j.issn.1000-6613.2017-0211

Abstract

Abstract: The polyvinylidene fluoride(PVDF)composite ultrafiltration membrane was prepared using semi-interpenetrating polymer network(semi-IPN)method. According to the membrane properties and its structure observed by SEM,the best conditions for building PVA/PVDF semi-IPN structure by acetalation of polyvinyl alcohol(PVA)and glutaraldehyde(GD)were that the addition of polyvinyl alcohol was 4.0%(mass percentage)and the ratio of glutaraldehyde to PVA was 0.5 in the casting solution. Performance of the semi-IPN structure composite membrane reached the best when the casting solution formula was PVDF/PVA/PVP/GD/NMP=16/4/3/2/75,with the flux=612.3L/(m²·h),the contact angle=48.3°,the BSA rejection=98.7%,the blasting pressure=1.0MPa,and the adsorption capacity of BSA 45.3μg/cm². The composition and structure of the membrane were characterized by X-ray photoelectron spectroscopy(XPS)and infrared analyzer(FTIR). After treating practical petrochemical wastewater for a month,the water flux was 144.4L/(m²·h),the removal rate of COD was 80.4%,and the turbidity removal rate was about 97.2%. Compared with the parameters of the membrane prepared by the formula without the semi-IPN structure,the PVA/PVDF composite membrane had larger water flux,enhanced hydrophilicity,higher anti-pollution and backwashing capacity and therefore the comprehensive performance of the membrane was increased significantly.

Key words: semi-interpenetrating polymer network (semi-IPN), polyvinylidene fluoride (PVDF), preparation, membrane, hydrophilic, wastewater

摘要： 利用半互穿网络法制备聚偏氟乙烯（PVDF）复合超滤膜，根据膜性能参数及扫描电子显微镜（SEM）结构分析确定，聚乙烯醇（PVA）与戊二醛（GD）发生缩醛化反应构建PVA/PVDF半互穿网络结构的最佳条件为，铸膜液中聚乙烯醇的添加量为4.0%（质量分数）、戊二醛与聚乙烯醇加入量的比率为0.5，筛选出的PVDF/PVA/PVP/GD/NMP=16/4/3/2/75配方制备的半互穿网络结构复合膜性能最佳，纯水通量为612.3L/（m².h），接触角48.3°，BSA截留率98.7%，爆破压力1.0MPa，BSA吸附量45.3μg/cm²，使用X射线光电子能谱仪（XPS）、红外分析测试仪（FTIR）等对制备的膜组成及结构进行了表征，用于处理实际石化废水运行一个月后，水通量为144.4L/（m²·h），COD去除率为80.4%，浊度去除率为97.2%，与未含这种结构的配方制备的PVDF膜性能参数相比，PVA/PVDF半互穿网络复合膜的水通量增大，亲水性能增强，抗污染、抗反洗能力加强，膜的综合性能明显提高。

关键词: 半互穿网络, 聚偏氟乙烯, 制备, 膜, 亲水性, 废水

CLC Number:

TQ028.8

YANG Li, LUAN Jinyi, YANG Yongqiang, XI Zhenyu, WEI Xin, GUO Zhi. Preparation of PVDF composite ultrafiltration membrane by semi-IPN method[J]. Chemical Industry and Engineering Progress, 2017, 36(08): 3024-3031.

杨丽, 栾金义, 杨永强, 奚振宇, 魏昕, 郭智. 半互穿网络法制备聚偏氟乙烯复合超滤膜[J]. 化工进展, 2017, 36(08): 3024-3031.

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