ZrO_2/TiO_2/PVDF超滤膜的制备与性能研究

Preparation and Performance Research of ZrO_2/TiO_2/PVDF Ultrafiltration Membrane

为改善聚偏氟乙烯(PVDF)超滤膜亲水性的不足,试验采用相转换法掺杂共混制备了含不同质量配比的纳米二氧化锆(ZrO2)粒子和纳米二氧化钛(TiO2)粒子的PVDF杂化膜,利用扫描电子显微镜(SEM)、接触角测量仪、傅里叶红外光谱仪(FT-IR)、X射线衍射仪(XRD)和热重分析仪对PVDF纯膜和PVDF杂化膜的结构和性能进行了表征及测试,并考察了两种无机纳米粒子添加量及添加比例对PVDF杂化膜膜通量的影响。结果表明:当添加纳米粒子的总质量分数为1%、且ZrO2与TiO2两种纳米粒子的质量比为1∶1时,PVDF杂化膜的膜通量是PVDF纯膜的1.43倍;纳米粒子的加入改善了PVDF膜的亲水性,且在一定程度上提高了PVDF膜的热稳定性。

In order to improve the hydrophilicity of polyvinylidene fluoride （PVDF） ultrafiltration （UF） membrane,this study first prepares a new type of PVDF hybrid ultrafiltration membrane with nanometer zirconium dioxide （ZrO2） and nanometer titania （TiO2） particles in various mass proportions by phase in- version method,then characterizes and tests the structure of both the pure PVDF membrane and the PVDF hybrid membrane by SEM, contact angel goniometer, Fourier transform infrared spectroscopy （FT-IR）, X- Ray diffractometer system （XRD）, and thermogravimetric analyzer （TGA）, and at last investigates the effects of nanometer particles addition and the different mass proportions of two kinds of nanometer parti- cles on the permeation performance of the hybrid membrane. The results show that the hybrid membrane water flux is 1.43 times as much as that of pure PVDF membrane when 1% nanometer particles addition with a mass proportion of ZrO2 and TiO2 of 1 ： 1 are applied. The addition of the nanometer particles plays a positive role in improving the hydrophilicity of PVDF hybrid membrane and enhances its thermostability at a certain degree.