摘要
采用相转化法,把纳米Fe3O4颗粒填充到聚砜(PSF)中制备PSF-Fe3O4磁性复合超滤膜.由扫描电镜观察可知两种膜的膜孔结构和孔径基本相似,纳米粒子主要在孔内壁上,部分发生了团聚.选取在溶液中带电的α淀粉酶和不带电的葡聚糖两类物质为研究对象,考察在有无磁场的情况下,PSF-Fe3O4膜对它们的截留率变化.结果表明,在0.4T的外加磁场下,当pH为2.5、3.5和7.5时,截留率分别从97%降到79%、84%和84%;对于不带电的物质葡聚糖;在0.4T的外加磁场下,PSF-Fe3O4膜的截留率也降低,从56%降到17%.通过这些现象来对PSF-Fe3O4膜在磁场下的作用机理进行分析.
A polysulfone（PSF）-Fe3 O4composite ultrafiltration membrane was made by phase-inversion process. SEM showed that most nano-particles were embedded in the walls of membrane pores, and parts of them were aggregated. In order to investigate the effect of magnetic field on the membrane separation properties,the charged a-amylase and uncharged dextran in solution were selected. The results showed that the rejection to a-amylase decreased from 97% to 79% , 84% and 84% respectively in the magnetic field with the intensity of 0.4 T when the pH is 2. 5,3.5 and 7. 5. The rejection to dextran also dropped from 56% to 17% in the magnetic field with the intensity of 0. 4 T. The mechanism of the PSF-Fe304 membrane in magnetic field was analysed by these phenomena.
出处
《膜科学与技术》
CAS
CSCD
北大核心
2013年第1期44-48,共5页
Membrane Science and Technology
基金
北京市博士后基金资助项目(2012zz-34)
