半互穿网络法制备聚偏氟乙烯复合超滤膜

发布时间：2018-03-31 19:03

本文选题：半互穿网络　切入点：聚偏氟乙烯　出处：《化工进展》2017年08期

【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/(m~2.h),接触角48.3°,BSA截留率98.7%,爆破压力1.0MPa,BSA吸附量45.3μg/cm~2,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/(m~2·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。
[Abstract]:Polyvinylidene fluoride (PVDF) composite ultrafiltration membrane was prepared by semi-interpenetrating network method. The optimum conditions for the acetalization reaction of polyvinyl alcohol (PVA) and glutaraldehyde (GD) to construct the semi-interpenetrating network structure of PVA/PVDF are as follows. The content of polyvinyl alcohol in casting solution is 4.0 (mass fraction, the ratio of glutaraldehyde to polyvinyl alcohol is 0.5). The semi-IPN composite membrane prepared by the selected PVDF/PVA/PVP/GD/NMP=16/4/3/2/75 formula has the best properties. The pure water flux is 612.3 L / m ~ 2 路h ~ (-1), the contact angle is 48.3 掳/ BSA rejection rate is 98.7g / cm ~ (-2), and the blasting pressure is 1.0 MPA / h ~ (-1) BSA adsorption capacity is 45.3 渭 g / cm ~ (-2). The membrane composition and structure have been characterized by X-ray photoelectron spectrometer (XPS) and FTIR (FTIR), which have been used to treat petrochemical wastewater for one month. The removal rate of water flux is 80.4, the turbidity removal rate is 97.2. the water flux of PVA / PVDF semi-IPN composite membrane is increased, the hydrophilicity is enhanced, the anti-pollution and anti-washing ability are enhanced compared with the performance parameters of PVA / PVDF composite membrane prepared without this structure. The comprehensive properties of the films were improved obviously.
【作者单位】：中国石油化工股份有限公司北京化工研究院环境保护研究所;
【分类号】：TQ051.893

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