基于Passerini反应改性PVDF超滤膜及其抗蛋白质污染性能
作者:武家鑫,付维贵,刘建超,薛莹莹,陈熙,冯霞,赵义平,陈莉
单位: 天津工业大学 材料科学与工程学院,分离膜与膜过程国家重点实验室,天津 300387
关键词: 表面改性;Passerini反应;PVDF超滤膜;抗污染;分离性能
分类号: TQ028.8
出版年,卷(期):页码: 2022,42(3):68-77

摘要:
本文以丙烯酸(AA)、乙醛(HA)和异腈基乙酸甲酯(MIA)为改性单体,基于Passerini反应对疏水性聚偏氟乙烯(PVDF)超滤膜进行表面接枝改性,以期提高膜的亲水性和抗污染性能;通过红外光谱、X-射线光电子能谱、场发射电子显微镜和原子力显微镜观察膜表面化学组成和形貌;通过膜表面水接触角、Zeta电位测试表征其亲水性和表面电荷,并测试膜的纯水渗透性能和抗蛋白质污染性能。结果表明,与原膜(M0)相比,经过Passerini反应进行24 h后,改性膜(M24)的接触角由M0的100.4°降低至58.9°;M24显弱负电性;牛血清蛋白(BSA)溶液动态循环过滤实验表明改性膜的截留率从85.5%增加到95.5%,通量恢复率从原膜的62.0%增加到为93.5%,不可逆污染指数从38.0%降低到6.5%。说明经过Passerini反应修饰后,膜的亲水性和抗污染性得到显著的提升。
 Acrylic acid (AA), acetaldehyde (HA) and methyl isocyanoacetate (MIA) were used as modified monomers and grafted onto the surface of PVDF ultrafiltration membrane based on Passerini reaction. The chemical composition and morphology of the membrane surface were observed by infrared spectroscopy, X-ray photoelectron spectroscopy, field emission electron microscope and atomic force microscope. The water contact angle and Zeta potential of the membrane surface were observed to characterize the hydrophilicity and surface charge, respectively. The pure water permeability and anti-pollution performance of the membranes were also tested. The results showed that the contact angle of M24 modified membrane after Passerini reaction for 24 h decreased compared with pure PVDF membrane (M0) from 103° to 58°, and the M24 was weakly negative charged. Moreover, the dynamic circulation filtration results indicated that the flux recovery rate increased from 62.0% to 93.5%, and the rejection rate increased from 85.5% to 95.5%. The irreversible pollution index has been reduced from 38.0% to 6.5%. Therefore, the modified membrane based on Passerini reaction possess high water hydrophilicity and protein resistance.

基金项目:
天津市教委科研计划项目 (No. 2017ZD04),天津工业大学纤维培育基金(No.TGF-21-A8).

作者简介:
武家鑫(1995-),男,内蒙古呼和浩特人,硕士研究生,主要研究方向超滤膜的制备及其性能研究

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