以六水合硝酸铈、正丁醇钛为原料,通过水热合成技术制备了CeO₂-TiO₂、CeO₂及TiO₂纳米颗粒,将制备的纳米颗粒添加到聚偏氟乙烯(PVDF)中制备PVDF复合膜。利用X-射线衍射仪(XRD)、透射电子显微镜(TEM)、冷场扫描电子显微镜(SEM)对CeO₂-TiO₂纳米颗粒的形貌、结构及组成进行表征;利用红外光谱(FT-IR)、原子力显微镜(AFM)以及自制错流过滤系统对纯PVDF膜及PVDF复合膜的形貌、结构及性能进行表征。结果表明,CeO₂-TiO₂纳米颗粒呈现出多孔、聚集体结构及结晶状;相对于纯PVDF膜,PVDF复合膜的纯水通量、BSA截留率及通量恢复率均有不同程度的提升,尤其是PVDF-CeO₂-TiO₂(PVDF-CT)复合膜的亲水性和抗污染性有显著提升。当CeO₂-TiO₂纳米复合颗粒的质量分数为9%时,PVDF-CT复合膜对BSA的截留率达到94.1%,通量恢复率达到95%。

CeO₂-TiO₂ nanoparticles,CeO₂ nanoparticles and TiO₂ nanoparticles are prepared through hydrothermal synthesis technology with Ce(NO₃)₃·6H₂O and titanium n-butanol (Ti(OC₄H₉)₄) as raw materials.Those as-synthesized nanoparticles are applied to modify polyvinylidene fluoride (PVDF) membranes to prepare PVDF composite membranes.By means of X-ray diffraction (XRD),Transmission Electron Microscope (TEM),Cold field scanning electron microscope (SEM),Atomic Force Microscope (AFM) and self-made cross filtration system,the morphology,structure,composition and properties of CeO₂-TiO₂ nanoparticles and PVDF composite membranes are investigated.Results display that the as-synthesized CeO₂-TiO₂ nanoparticles show mesoporous,aggregated and crystal structures.In contrast with pure PVDF membrane,the flux,BSA rejection rate and flux recovery rate of PVDF composite membranes all have an increase to a content degree.Especially,the hydrophilicity and anti-fouling properties of PVDF-CeO₂-TiO₂ (PVDF-CT) composite membranes have a dramatic increase.The BSA rejection rate and flux recovery rate of PVDF-CT composite membranes achieve 94.1% and 95%,respectively when the addition of CeO₂-TiO₂ nanoparticles is 9 wt.%.

季红军(1983-),男,博士,工程师,研究方向为膜材料改性及在污水中的应用研究,hongjun-ji@163.com