紫外辐照接枝制备亲水性荷正电纳滤膜

通过在酚酞基聚芳醚酮超滤膜表面紫外辐照接枝亲水性单体二烯丙基二甲基氯化铵(DADMAC)制备了一种表面荷正电的纳滤膜. ATR-FTIR和表面水接触角的研究结果表明膜表面的接枝率和亲水性随着辐照时间和单体在接枝溶液中的浓度的增加而增加. 荷正电纳滤膜对盐溶液有很好的截留, 对盐溶液中的高价阳离子和低价阳离子的截留率分别为95%和65%. 但当溶液中存在高价负离子时, 膜的截留性能会明显下降. 表明静电效应在荷电纳滤膜的分离过程中起了重要的作用.

Preparation of Hydrophilic Positively Charged Nanofiltration Membrane by UV Graft Polymerization

A hydrophilic positively charged nanofiltration membrane was prepared by UV irradiation graft polymerization of diallydimethyl ammonium chloride (DADMAC) onto the surface of ultrafiltration membranes made of polyetherketone cardo (PEK-C). Analysis of ATR-FTIR and contact angles of the modified membrane showed that the grafting degree of the membrane and their hydrophilicity increased with the irradiation time and the monomer concentration in grafting solution. The modified nanofiltration showed a good retention to salts and the retention of the membrane to high valent cation and low valent cation was 95% and 65%, respectively. The separation performance of the membrane decreased in the presence of high valent negative counter-ions. The results show that the electrostatic effect played a major role in nanofiltration by charged membrane.