应用非溶剂致相法,通过自主设计研发的平板刮膜机制备聚偏氟乙烯(PVDF)成品膜.为提高PVDF超滤膜的综合性能,以聚乙二醇(PEG)为成孔剂,以二氧化钛(TiO2)为添加剂,系统研究了PVDF固含量、成孔剂种类和含量以及TiO2纳米颗粒对PVDF超滤膜的微观形态以及通量和截留率的影响.结果表明,当PVDF固含量(质量分数)为22%,PEG-6000质量分数为17.5%,并且添加质量分数0.5%TiO2所制备的成品膜具有较高的综合性能,其纯水通量可达1 030 L/(m2·h·0.1MPa),对胃蛋白酶的截留率可达76%.
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