一种表面荷正电纳滤膜的制备与性能研究

Preparation and Performance of A Positively Charged Nanofiltration Membrane

以三(2-氨基乙基)胺为水相单体、均苯三甲酰氯为有机相单体,在聚醚砜超滤基膜上运用界面聚合的方法,制备复合纳滤膜。膜表面XPS和红外的分析表明了聚合反应的发生。复合膜性能测试显示最佳制备条件为三(2-氨基乙基)胺的质量分数为1.5%、均苯三甲酰氯的质量分数为0.1%,界面聚合反应时间为60s。复合纳滤膜表面等电点为pH=8,在中性、酸性溶液中膜表面呈正电性。复合膜在0.6Mpa下水通量约9.5L/(m^(2)·h),对盐的截留情况为:Na_(2)SO_(4)(95.54%)>MgSO_(4)(91.5%)>MgCl_(2)(90.57%)>Na为Cl(69.05%)。

A positively charged composite nanofiltration membrane was formed though interfacial polymerization on the surface of the polyethersulfone ultrafiltration membrane substrate with tris(2-aminoethyl)amine and(TMC) as the monomers in aqueous and organic phases,respectively.XPS and IR analysis of the membrane surface indicated the occurrence of polymerization.The performance test of the composite membrane showed that the prepared conditions should be controlled as tris(2-aminoethyl)amine concentration 1.5%(wt.),TMC 0.1%(wt.) and the interfacial polymerization time nearly 60 s.The isoelectric point(IEP) of the composite nanofiltration membrane surface at pH about 8.0,so the surface charge is positive in neutral and acidic solutions.The water permeability of about 9.5 L/(m2.h) at the pressure of 0.6 MPa,and the order of salts rejection rate is Na_(2)SO_(4)(95.54%)>MgSO_(4)(91.5%) >MgCl_(2)(90.57%)>NaCl(69.05%).