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采用相转化法制备聚偏氟乙烯(PVDF)-纳米二氧化硅(n Si O_2)复合微滤膜,研究了n Si O_2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 O_2的引入能有效改善膜的抗污染性能,以n Si O_2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。
Polyvinylidene fluoride (PVDF) - nanosilica (nSiO2) composite microfiltration membrane was prepared by phase inversion method. The effects of dosage of nSiO2, mixing speed and stirring time on the properties of composite membrane The microstructure, anti-pollution ability, surface hydrophilicity and separation performance of different membranes were characterized by scanning electron microscopy, dead-end filtration experiment, contact angle measurement, porosity and water flux. The results show that the introduction of n Si O 2 can effectively improve the anti-pollution performance of the membrane, with the mass fraction of n Si O 2 being 0.05%. With the increase of stirring speed, the hydrophilicity and separation performance of the membrane are improved , When the stirring speed is 800 r / min, the stirring time is 4 d, the membrane performance is the best.