界面聚合法制备聚哌嗪酰胺复合纳滤膜

以聚醚砜超滤膜为基膜,哌嗪(PIP)为水相单体,均苯三甲酰氯(TMC)为有机相单体,采用界面聚合法制备了复合纳滤膜,扫描电镜、表层的红外分析结果表明在基膜表面聚合了一层聚酰胺膜,膜性能测定结果表明膜表面荷负电,对不同无机盐的截留率为Na2SO4MgSO4MgCl2NaCl。界面聚合条件对膜性能的影响表明,最佳聚合条件为:PIP浓度0.5%～2%,TMC浓度0.15wt%～0.75wt%,聚合时间≥1min,热处理温度60℃～80℃,时间15 min左右。

Preparation of polypiperazine-amide composite nanofiltration membrane through Interfacial polymerization

Thin film composite membranes for nanofiltration were fabricated through interfacial polymerization.The membranes were prepared on the support of polyethersulfone(PES) ultrafiltration membranes with piperazine(PIP) as aqueous monomer and trimesoyl chloride(TMC) as organic monomer.The surface structure and chemical composition were analyzed by scanning electron microscope(SEM) and Fourier transform infrared spectrophotometry(FTIR).The results revealed that a thin layer composed of polyamide was formed on the support.Experiment results of membrane performance showed that the membrane was negatively charged and the salts rejection order was Na_2SO_4＞MgSO_4＞MgCl_2＞NaCl.The optimum polymerization conditions were PIP concentration 0.5%~2%,TMC concentration 0.15wt%～0.75wt%,reaction time≥1min,curing temperature 60℃~80℃,curing time about 15 min.