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为提高聚偏氟乙烯超滤膜的亲水性,增强其在水处理中的抗污染能力,采用无机纳米颗粒二氧化钛、氧化铝与聚偏氟乙烯共混,使用相转化法流延工艺制得无机改性有机高分子板式共混超滤膜;用杯式超滤装置考察了无机纳米颗粒的含量对改性膜性能的影响,用扫描电子显微镜观察纳米氧化铝颗粒、氧化钛颗粒在膜中的分布,对膜表面、断面孔结构及孔径进行观察;采用X射线光电子能谱测定改性超滤膜的元素组成及其比例。结果表明,纳米颗粒加入的总质量分数为3%,二氧化钛与氧化铝的加入质量比为1:1时,改性膜的水通量最大;纳米颗粒的加入并没有改变有机膜的微观结构和形态;改性超滤膜不仅保持了PVDF膜优良性能,而且增加了其强度、亲水性和抗污染性能。
In order to improve the hydrophilicity of polyvinylidene fluoride ultrafiltration membrane and enhance its anti-pollution ability in water treatment, inorganic nano-particles of titanium dioxide, aluminum oxide and polyvinylidene fluoride are blended and prepared by the phase inversion casting method Inorganic modified organic polymer plate blend ultrafiltration membrane; with cup ultrafiltration device inspected the content of inorganic nanoparticles on the performance of the modified membrane, observed by scanning electron microscopy nano-alumina particles, titanium oxide particles in the film Of the membrane surface, cross-sectional pore structure and pore size were observed; X-ray photoelectron spectroscopy to determine the elemental composition of the modified ultrafiltration membrane and its ratio. The results showed that the total mass fraction of nano-particles was 3% and the mass ratio of TiO2 to alumina was 1: 1, the water flux of modified membrane was the largest. The addition of nano-particles did not change the microstructure of organic membrane and Morphology; modified ultrafiltration membrane not only maintained the excellent performance PVDF membrane, but also increased its strength, hydrophilicity and anti-pollution properties.