聚砜-Fe3O4磁性复合超滤膜截留分子量随磁场的变化规律

在制备聚砜-Fe3O4磁性复合超滤膜的过程中,为避免纳米Fe3O4粒子团聚,采用偶联剂包裹共沉淀法得到Fe3O4粒子,然后采用相转化法制备了聚砜-Fe3O4磁性复合超滤膜。Zeta电位仪检测出纳米粒子平均粒径为66.83 nm,红外分析发现偶联剂结合在粒子表面。经扫描电镜观察和孔径分布分析得出复合膜中纳米Fe3O4粒子分布均匀,无团聚现象出现,孔径分布较窄。聚乙二醇系列测定基膜为2万的复合膜截留分子量从0T下的19800减小至0.4T的15000,继续增大外加磁场,截留分子量基本不再变化。

Changing Law of Molecular Weight Cut-Off of Polysulfone-Fe3O4 Magnetic Composite Ultrafiltration Membrane

The changing law of molecular weight cut-off(MWCO) of polysulfone-Fe3O4 magnetic composite ultrafiltration membranes with magnetic field intensity was studied.In order to restrain Fe3O4 nanoparticles from agglomerating,the nanoparticles were packed by the coupling agent and were prepared by chemical co-precipitation.Composite membranes were prepared by the phase inversion process.Nanoparticles’ average diameter determined by Zeta potential instrument was 66.83 nm.Through infrared analysis,the coupling agent combins with the surface of particles.Uniform distribution of Fe3O4 nanoparticles,no agglomeration and narrow pore size distribution were obtained through scanning electron microscopy and determination of pore size distribution.The MWCO of composite membranes,in which MWCO of basement membrane is 20000,decrease from 19,800 of 0T to 15,000 of 0.4T.Then continuing to increase the magnetic intensity,there is no more changes happened.