磺化聚醚砜复合反渗透膜的制备与性能研究

Preparation and properties of reverse osmosis membrane based on sulfonated poly(ether sulfone)

通过亲核取代反应制备了酚酞型聚醚砜(PES),利用浓硫酸对其磺化后得到了磺化聚醚砜(SPES),并通过核磁光谱对其结构进行了表征.将SPES与一定量的PVA溶解混合后,以聚砜超滤膜为支撑层,采用刷涂法制备了复合反渗透膜(SPES-PVA).扫描电镜照片显示该方法制备的反渗透膜表面平整,而且无缺陷.PVA的加入提高了膜的截盐率以及耐氯性.采用该方法得到的复合反渗透膜具有良好的截盐率和水通量.其中,当PVA的加入量为0.1%时,SPES-PVA-0.1复合反渗透膜对氯化钠的截盐率达到了97.8%,水通量为12.3L/(m2·h).

Cardo poly（ether sulfone）polymer（PES）was synthesized by direct copolymerization method.After sulfonation,sulfonated poly（ether sulfone）polymer（SPES）was obtained,and the structure of the polymer was confirmed by 1 H NMR.Reverse osmosis membranes were prepared by brushing method with SPES and PVA as the functional material and polysulfone ultrafiltration membrane as a support-layer.The SEM results indicated that the obtained reverse osmosis membranes had smooth surface,and no defect was observed.The introduction of PVA into the reverse osmosis membranes resulted in the improvement of the salt rejection and chlorine-tolerance.All the membranes showed appropriate water flux and salt rejection.Notably,SPES-PVA-0.1,with PVA content of 0.1%,exhibited a NaCl rejection of 97.8% and water flux of 12.3L/（m^2·h）at 2.0 MPa.