The performance of the PVDF-Fe₃O₄ ultrafiltration membrane and the effect of a parallel magnetic field used during the membrane formation

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• 作者：Zheng-Qing Huang ; ^{huangzq18@126.com} ; Feng Zheng ; Zhi Zhang ; Hong-Tao Xu ; Kai-Mei Zhou
• 关键词：Polyvinylidene fluoride ; Ferrosoferric oxide ; Magnetic field ; Organic&ndash ; inorganic membranes ; Ultrafiltration membrane
• 刊名：Desalination
• 出版年：2012
• 期刊代码：24_00119164
• 类别：ce
• 出版时间：16 April, 2012
• 卷：292
• 期：Complete
• 页码：64-72
• 文件大小：1981 K

摘要

A series of PVDF-Fe₃O₄ ultrafiltration membranes with different amounts of Fe₃O₄ were prepared in a parallel magnetic field or without a magnetic field from suspensions, using the phase inversion process. A comparison of membrane properties was conducted. When the Fe₃O₄ content in a membrane was below 65 wt%, both of the Fe₃O₄ content and the magnetic field used during the formation of membrane had no dramatic influence on the flux and the fouling-resistance ability of a PVDF-Fe₃O₄ ultrafiltration membrane. However, the initial rejection of a PVDF-Fe₃O₄ ultrafiltration membrane increased with the Fe₃O₄ content in a membrane. When the Fe₃O₄ content in a membrane reached 65 wt%, the external magnetic field forced magnetic Fe₃O₄ particles in a casting solution to arrange along the direction of the magnetic field during the membrane formation. As a result, a novel membrane with 鈥渓amellar macrovoids鈥?in the sublayer could be prepared. The PVDF-Fe₃O₄ membrane of 70 wt%Fe₃O₄ with鈥渓amellar macrovoids鈥?in the sublayer had the best comprehensive performance in terms of pure water flux, rejection and fouling- resistance and compaction-resistance ability.