膜污染是制约超滤膜广泛使用的最重要因素之一，膜污染直接影响到膜的使用寿命及膜的分离性能。本文采用静电纺丝技术制备了PET/PVA纳米纤维复合超滤膜，通过溶剂浸泡处理复合膜，将PVA纳米纤维层溶胀并交联，形成具有抗污染性能的PVA表面致密层结构，所制备的复合纳米纤维超滤膜具有水通量损失率小、通量恢复率高的优点。通过在PVA中添加不同质量分数的纳米TiO2进一步改善膜的亲水性和抗污染性能。使用死端过滤系统过滤10 ppm腐殖酸溶液，测试结果表明：复合膜的分离性能和抗污染性能在一定范围内随着TiO2的增加而增大。亲水性TiO2的添加能够进一步增强PVA的亲水性，对复合膜抗污染性能的提高有重要作用。 但是，TiO2的添加也会增大膜表面的粗糙度，不利于膜抗污染性能的提高，因此，TiO2有一个合宜的添加限度。

 Membrane fouling is one of the most important challenges faced in ultrafiltration (UF) operations . In this study , a three layers composite ultrafiltration membrane contains titanium dioxide(TiO2) was prepared by electrostatic spinning technology . Hydrophilic nano TiO2 was added in PVA by doping technology . Finally through the mixed solvent for processing , the high flux , high rejection ratio composite electrospinning ultrafiltration membrane with good antifouling property was made .

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