磷钼酸/聚苯乙烯/聚乙烯醇电纺纤维膜的制备及性能

采用静电纺丝法制备了磷钼酸/聚苯乙烯(PS)/聚乙烯醇(PVA)复合纤维,并将其模压成膜.利用红外光谱(IR)、扫描电子显微镜(SEM)及X射线能谱(EDX)等对复合纤维及其膜的结构与形貌进行表征,并对复合纤维膜的光催化性能、力学性能及在水中稳定性进行测试.结果表明,在复合纤维中磷钼酸的Keggin结构得到保持.PS与PVA质量比为1∶1时,复合纤维形貌最佳,表面光滑,直径较小且分布均匀,复合纤维的直径随着磷钼酸含量的增加而减小.将磷钼酸固载于复合纤维膜上比直接使用具有更高的光催化活性,光照25 min后接近98%的甲基橙降解;复合纤维膜易于回收再利用,5次重复使用后,复合纤维膜没有破损,磷钼酸损失较少,光催化性能无明显下降.复合纤维膜的强度随磷钼酸含量的增加先增大后减小,韧性随PVA含量的增加而增大,随磷钼酸含量的增加而减小.

Preparation and Performance of POMs/PS/PVA Electrospinning Fiber Membranes

POMs(phosphomolybdic acid)/PS(polystyrene)/PVA(polyvinyl alcohol) composite fibers were prepared by electrospinning, which were molded into a membrane. The structure and morphology of the composite fibers were characterized, by infrared(IR) spectroscopy, scanning electron microscopy(SEM) and energy dispersive X-ray(EDX) spectroscopy. The photocatalytic performance and mechanical properties of the composite fibers membranes were also tested. The results show that the Keggin structure of POMs in the composite fiber was not destroyed. When the mass ratio of PS and PVA was 1:1, the composite fibers got the best morphology, smooth surface and smaller diameter along with uniform distribution. The diameter of composite fibers decreased with the increase of POMs content. UV test showed that the POMs immobilized on composite fiber membranes displayed higher photocatalytic activity than that of the direct use. Around 98% of methyl orange was degraded after 25 min irradiation. The composite fiber membrane was easy to recycle and reuse. After using 5 times repeatedly, the photocatalytic activity of the composite fiber membranes was not significantly reduced. The composite fiber membranes were very few breakages. The composite fiber membranes strength increased first and then decreased with the POMs content increased. The toughness increased with the increase of PVA content but the toughness decreased with the increasing of the POMs content.