通过仿生矿化技术在PVDF超滤膜表面和孔壁修饰无机ZrO₂矿化层来制备PVDF/ZrO₂矿化膜，考察矿化时间对膜的微观结构、机械强度和抗压密性能的影响。结果表明，ZrO₂矿化层均匀负载于膜表面和膜孔内壁，且随着矿化时间的增加矿化层逐渐增厚；无机ZrO₂矿化层可显著提高PVDF膜的结构刚性，矿化时间为60 min的PVDF/ZrO₂矿化膜的拉伸强度和硬度比纯PVDF膜分别提高了76%、79%，运行过程中因机械压密产生的通量衰减率则从纯PVDF膜的53%降低至32%，达到利用ZrO₂矿化层提高PVDF膜抗压密性能、抑制通量衰减的目的。同时，ZrO₂矿化层改善了PVDF膜的透水性能，PVDF/ZrO₂矿化膜的纯水通量和BSA截留率分别达到165.2 L/m²·h和91.4%。

Mineralized PVDF/ZrO₂ membrane is prepared through modifying inorganic ZrO₂ mineralized layer on the surface and pore wall of PVDF ultrafiltration membrane by biomimetic mineralization technology.The effects of mineralization time on the microstructure,mechanical strength and anti-compression properties of the membrane are investigated.Results indicate that ZrO₂ mineralized layer is evenly supported on the surface of the membrane and the inner wall of pores of the membrane.The mineralized layer gradually thickens with the prolonging mineralization time.Inorganic ZrO₂ mineralization layer can significantly increase the structural rigidity of PVDF membrane,therefore improving its anti-pressure density and suppressing its flux attenuation.In comparison to pure PVDF membrane,the tensile strength and hardness of the PVDF/ZrO₂ mineralized membrane that has been mineralized for 60 min increase by 76% and 79%,respectively,while the flux attenuation rate generated due to mechanical compaction during operation decreases from 53% to 32%.On the other hand,ZrO₂ mineralized layer has also elevated the water permeability of PVDF membrane.The pure water flux and BSA rejection of PVDF/ZrO₂ mineralized membrane reach 165.2 L·m^-2·h and 91.4%,respectively.

徐积斌(1993-),男,硕士研究生,主要从事膜材料制备及应用研究,15551276916@163.com