为了赋予聚丙烯微孔膜(MPPM)油水分离能力,采用仿生矿化技术在膜表面构建了纳米硅酸钙涂层。通过红外光谱、扫描电镜和能谱对矿化膜进行表征,发现矿化后膜表面形态并未发生明显变化,仅在膜表面覆盖了一层分布均匀的纳米硅酸钙颗粒。静态水接触角、水下油接触角及纯水通量研究结果显示,矿化膜具有优异的亲水性及水下疏油性,透水能力强,在0.10MPa跨膜压力下,水通量高达6043L/(m2·h)。油水分离结果表明,矿化膜能有效分离油水混合物和油水乳液,在0.10MPa跨膜压力下,油水乳液水通量高达3201L/(m2·h),油截留率可保持在99.98%以上,且膜表面的油污容易用水冲洗除去。
To endow the oil/water separation capability of microporous polypropylene membrane (MPPM),nano calcium silicate modified layers were fabricated on MPPM surface by biomineralization-inspired technique.The mineralized membranes were characterized with fourier transform infrared spectroscopy (FT-IR),scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX).The results confirmed that the surface morphology of membranes did not change obviously after mineralization,and only a uniform distribution of nano calcium silicate particles was covered on the membrane surface.The results of static water contact angle,underwater oil contact angle and pure water flux indicated that the membranes had excellent superhydrophilic and underwater superoleophobic characteristic,and showed excellent water permeability with high pure water flux (up to 6043L/(m2·h) under 0.10MPa transmembrane pressure).The oil/water separation ability of membranes was also investigated.It was found that the membranes could effectively separate oil-water mixture and oil-water emulsion,water flux of oil-water emulsion was up to 3201L/(m2·h),and oil retention rate can be maintained at more than 99.98% under 0.10MPa.Moreover,the oil attached to the membrane surfaces could be easily removed by water.
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基金资助
福建省自然科学基金(2015J01602和2014J01056)
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