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首页> 外文期刊>Environmental Science & Technology >Field-Induced Redistribution of Surfactants at the Oil/Water Interface Reduces Membrane Fouling on Electrically Conducting Carbon Nanotube UF Membranes
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Field-Induced Redistribution of Surfactants at the Oil/Water Interface Reduces Membrane Fouling on Electrically Conducting Carbon Nanotube UF Membranes

机译：表面活性剂在油/水界面处的场致重分布减少了导电碳纳米管超滤膜上的膜污染

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摘要

Membrane-based treatment of oily wastewater remains a significant challenge, particularly under high salinity conditions. The main difficulty associated with this separation process is membrane fouling, mostly caused by wetting and coalescence of emulsified oil droplets on the membrane surface. In this study, electrically conducting carbon nanotube-based ultrafiltration membranes were used to treat an emulsified oil suspension at ionic strengths as high as 100 mM. By tuning the electrical potential applied to the membrane surface, we demonstrate how fouling can be dramatically reduced, even under high salinity conditions. Permeate water quality is shown to improve upon application of a negative potential. Using optical microscopy, we observed dramatic changes in the shape of oil droplets at the membrane/water interface in response to the applied electric potential; this change is associated with a redistribution of charged surfactant molecules at the oil/water interface in response to the external electric field. Specifically, using the membrane as a cathode repels surfactant molecules away from the oil/membrane interface, while anodic conditions lead to increased surfactant concentrations. We speculate that this change in surfactant molecule distribution is responsible for changes in the surface tension of oil droplets at the membrane/water interface, which results in a decrease in oil coalescence and subsequent fouling. The membranes used in this study offer an attractive treatment option when separating emulsified oil from water under high salinity conditions.
机译：基于膜的含油废水处理仍然是一项重大挑战，特别是在高盐度条件下。与该分离过程相关的主要困难是膜结垢，这主要是由膜表面上乳化的油滴的润湿和聚结引起的。在这项研究中，基于碳纳米管的导电超滤膜用于处理离子强度高达100 mM的乳化油悬浮液。通过调节施加到膜表面的电势，我们证明了即使在高盐度条件下也可以显着减少结垢。渗透水的质量显示出在施加负电位时会改善。使用光学显微镜，我们观察到了膜/水界面上油滴的形状随所施加的电势发生了巨大变化。这种变化与带电的表面活性剂分子响应于外部电场在油/水界面处的重新分布有关。具体而言，将膜用作阴极可排斥表面活性剂分子远离油/膜界面，而阳极条件会导致表面活性剂浓度增加。我们推测表面活性剂分子分布的这种变化是膜/水界面处油滴表面张力变化的原因，这导致油聚结和随后的结垢减少。在高盐度条件下从水中分离乳化油时，本研究中使用的膜提供了一种有吸引力的处理选择。

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  • 来源
    《Environmental Science & Technology》 |2018年第20期|11591-11600|共10页
  • 作者

    Zhu Xiaobo; Dudchenko Alexander V; Khor Chia Miang; He Xin; Ramon Guy Z.; Jassby David;

  • 作者单位

    Univ Calif Los Angeles, Dept Civil & Environm Engn, Los Angeles, CA 90095 USA;

    Carnegie Mellon Univ, Dept Civil & Environm Engn, Pittsburgh, PA 15213 USA;

    Univ Calif Los Angeles, Dept Civil & Environm Engn, Los Angeles, CA 90095 USA;

    Nankai Univ, Coll Environm Sci & Engn, Tianjin, Peoples R China;

    Technion Israel Inst Technol, Dept Civil & Environm Engn, Haifa, Israel;

    Univ Calif Los Angeles, Dept Civil & Environm Engn, Los Angeles, CA 90095 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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