中文摘要：

采用相转化法制备聚偏氟乙烯（PVDF）-纳米二氧化硅（n Si O2）复合微滤膜,研究了n Si O2投加量、制膜过程中的搅拌转速和搅拌时间对复合膜的影响,通过扫描电子显微镜、死端过滤实验、接触角测量、孔隙率、清水通量等,分别对不同膜的微观结构、抗污染能力、表面亲水性、分离性能进行了联合表征。结果表明,n Si O2的引入能有效改善膜的抗污染性能,以n Si O2的质量分数为0.05%为最佳;随着搅拌转速的增大,膜亲水性能、分离性能均有所提高,当搅拌转速为800 r/min、搅拌时间以4 d时,膜性能最优。

英文摘要：

In this study, the polyvinylidene fluoride （PVDF）-silica nanoparticles （nSiO2） composite microfiltration membranes were prepared via phase inversion method. We investigated the effects of the nSiO2 dosage, stirring speed and duration on the modification of composite microfiltration membranes. The microstructure, antifouling capability, surface hydrophilicity and separation performance were characterized by scanning electron microscope, dead- end filtration test, contact angle measurement system, porosity and pure water flux, respectively. The experimental results indicated that the antifouling properties of modified membrane could be most significantly improved by adding nSiO2 with 0.05% mass fraction. The membrane surface hydrophilicity and separation performance were effectively enhanced with the increasing of stirring speed. When the stirring speed and time were 800 r/min and 4 d respectively, the membrane performance was best.