中空纤维纳滤膜基膜的选择及对PDM吸附过程研究

Research on selschin of support membrane and adsorbing process of PDM for hollow fiber composite nanofiltration membrane

针对聚甲基丙烯酸-N,N-二甲氨基乙酯(PDM)/聚砜(PSF)中空纤维复合纳滤膜的制备,研究了基膜对纳滤膜截留性能的影响以及基膜对PDM溶液的吸附情况.实验结果表明:膜体中含有指状孔的中空纤维超滤膜适宜于作为复合纳滤膜的基膜.基膜外表面对PDM溶液的吸附饱和时间很短,在60s内能完全达到饱和;在PDM水溶液中加入乙醇,溶液的粘度增加,吸附量增加.所制备的纳滤膜的截留率可达98%,水通量可达17.4L/(m·2h).

The effect of support membrane on the separation performances of poly [2-（N,N-dimethyl amino）ethyl methacrylate]（PDM） / polysulfone（PSF） hollow fiber composite nanofiltration （NF） membrane and PDM adsorption on the support membrane is investigated. The results show that the support membrane, which has finger- pore, is fit to prepare composite nanof＇dtration membrane. The adsorbing time of PDM on the outside surface of PSF hollow fiber membrane is short, about 60 s. The viscosity of aqueous PDM solution and the adsorbed PDM quantities increased with ethanol is added in the solution. The rejection is 98%, and the flux of NF membrane is 17.4 L/（m^2·h）.