金属有机骨架(MOF)具有极高的孔隙率、较大的比表面积等优点,被用于膜材料的改性.研究通过对氨基苯二甲酸锆(UiO-66-NH2)进行酰胺化反应合成了一种后修饰MOF改性剂(简称为UF-X),并与聚偏氟乙烯(PVDF)进行共混制膜.利用傅里叶红外光谱(FTIR)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、接触角测试等分析膜的性能.膜的水接触角从原始的70.17°降至60.45°,表明共混膜的亲水性显著改善.油水乳液分离实验表明:共混改性膜M2(含 0.5%UF-2)对油水乳液的截留率大于95%,其纯水通量为280.70 L/(m2·h),相对通量恢复率高于 94.7%.此外,经过两次循环过滤后,膜的通量恢复率高达98%,其纯水通量可维持在252.6 L/(m2·h),表明该共混改性方法能提高PVDF膜的油水分离性能和抗污染能力,在油水分离领域具有良好的应用前景.
Metal-organic skeletons(MOFs)were used for the modification of membrane materials because of their extremely high porosity and large specific surface area.In this research,a post-modified MOFs modifier(abbreviated as UF-X)was synthesized by amidation reaction of UiO-66-NH2 and blended with polyvinylidene fluoride(PVDF)to prepare membranes.The performance of the membranes was analyzed using Fourier infrared spectroscopy(FTIR),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and contact angle test.The water contact angle of the membranes decreases from the original 70.17°to 60.45°,indicating that the hydrophilicity of the blended membranes is significantly improved.The oil-water emulsion separation experiments show that the retention rate of the blend-modified membrane M2(containing 0.5 wt%UF-2)for oil-water emulsion is greater than 95%,and itspurewater flux is 280.7 L/(m2·h),with the relative flux recovery rate higher than 94.7%.In addition,after two cycles of filtration,the flux recovery of the membrane is as high as98%,and its pure water flux could maintain at 252.6 L/(m2·h),which indicates that the co-modification method could improve the oil-water separation performance and anti-pollution ability of the PVDF membrane,and it has a good prospect of application in the field of oil-water separation.