辐射接枝制备中空纤维纳滤膜的性能研究

Study on properties of hollow fiber nanofiltratiton membrane prepared by radiation graft polymerization

对以聚砜(PSF)中空纤维超滤膜为基体,通过低温等离子体辐照接枝2-丙烯酰胺基-2-甲基丙磺酸(AMPS)制备的纳滤膜的结构和性能进行了研究。结果表明,这种方法可以制得断裂强力高于PSF基膜,孔径约为2.6nm和纯水渗透系数为44.3L/(m2.h.MPa)的纳滤膜。在25℃,0.4MPa下对300mg/L的K2SO4、Na2SO4、MgSO4、KCl、NaCl和MgCl2的截留率为89.3%、88.3%、52%、39.6%、37.4%和13.2%,表明该纳滤膜为荷负电膜,对无机盐的截留主要依靠Donnan效应。

The structure and properties of the nanofiltration i NF） membrane was studied, which was prepared by grafting of 2-acrylamido-2-methylpropanesulfonic acid （AMPS） on the polysulfone （PSF） hollow fiber ultra- filtration membrane using low-temperature plasma-induced graft polymerization. The results showed that the pore size of NF membrane was 2.6nm and the pure water permeability was 44.3L/（m2 h MPa）, meanwhile, the breaking strength of NF membrane was higher than that of PSF substrate. At a temperature of 25℃ and a operating pressure of 0.4MPa, the rejection to 300mg/L K2SO4, Na2SO4, MgSO4, KCl, NaCl and MgCl2 were 89.3%, 88.3%, 52%, 39.6%, 37.4% and 13.2%, respectively, which indicated that the NF membrane was a negatively charged NF membrane and the rejection to salts was mainly depended on Donnan effect.