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Effect of the surface properties on filtration performance of Al2O3-TiO2 composite membrane

机译：表面性能对Al2O3-TiO2复合膜过滤性能的影响

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摘要

Knowledge of the surface properties of ceramic membranes is useful for understanding and predicting their filtration performance. In this study focus was put on investigation of the effect of membrane surface properties on filtration performance. The TiO2-doped Al2O3 composite microfiltration membrane with an average pore size of 0.2 mu m was prepared by solid state sintering method. The surface wettabil-ity and surface charge properties of porous ceramic membrane were determined by measurement of the dynamic contact angle and streaming potential. The results indicate the TiO2 doping improves membrane hydrophilicity and makes the isoelectric point shift towards lower pH. The Al2O3 and Al2O3-TiO2 membrane were applied to separate oily wastewater to evaluate the filtration performance. The interactions between the membrane surface and oil droplets strongly influence the formation of membrane fouling A higher and more stable permeate flux was observed through the Al2O3-TiO2 composite membrane, which demonstrated that in the filtration of oily wastewater enhancing membrane hydrophilicity and having the same type of charge as the oil droplets can improve the membrane filtration performance.
机译：了解陶瓷膜的表面特性对于理解和预测其过滤性能很有用。在这项研究中，重点是研究膜表面特性对过滤性能的影响。采用固相烧结法制备了平均孔径为0.2μm的TiO2掺杂Al2O3复合微滤膜。通过测量动态接触角和流动电位来确定多孔陶瓷膜的表面润湿性和表面电荷性质。结果表明，TiO2掺杂改善了膜的亲水性，并使等电点向更低的pH方向移动。用Al2O3和Al2O3-TiO2膜分离含油废水，以评价其过滤性能。膜表面与油滴之间的相互作用强烈影响膜污染的形成。通过Al2O3-TiO2复合膜观察到更高，更稳定的渗透通量，这表明在含油废水的过滤中，膜的亲水性增强并且具有相同的类型。电荷，因为油滴可以改善膜的过滤性能。

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