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首页> 外文期刊>Environmental Science & Technology >Properties Governing the Transport of Trace Organic Contaminants through Ion-Exchange Membranes
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Properties Governing the Transport of Trace Organic Contaminants through Ion-Exchange Membranes

机译：控制痕量有机污染物通过离子交换膜传输的特性

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摘要

Ion exchange membranes could provide a solution to the selective separation of organic and inorganic components in industrial wastewater. The phenomena governing the transport of organics through the IEM however, are not yet fully understood. Therefore, the transport of trace organic contaminants (TOrCs) as a model for a wide variety of organic compounds was studied under different conditions. It was found that in the absence of salt and external potential, the chemical equilibrium is the main driver for TOrC-transport, resulting in the transport of mainly charged TOrCs. When salt is present, the transport of TOrCs is hampered in favor of the NaCl transport, which shows a preferential interaction with the membranes due to its small size, high mobility and concentration. It is hypothesized that electrostatic interactions and electron donor/acceptor interactions are the main drivers for TOrC transport and that transport is mainly diffusion driven. This was confirmed in the experiments with different current densities, where the external potential seemed to have only a minor influence on the transport of TOrCs. It is only when the salt becomes nearly completely depleted that the TOrCs are transported as charge carriers. This shows that it is very difficult to get preferential transport of organic compounds due to the diffusive nature of their transport.
机译：离子交换膜可以为工业废水中有机和无机成分的选择性分离提供解决方案。但是，关于有机物通过IEM传输的现象尚未完全了解。因此，研究了在不同条件下作为多种有机化合物模型的痕量有机污染物（TOrC）的运输。发现在没有盐和外部电位的情况下，化学平衡是TOrC转运的主要驱动力，从而导致主要带电的TOrC的转运。当存在盐时，TorCs的运输受阻，有利于NaCl的运输，由于其较小的尺寸，高的迁移率和浓度，NaCl的运输表现出与膜的优先相互作用。假设静电相互作用和电子给体/受体相互作用是TOrC传输的主要驱动力，并且该传输主要是扩散驱动的。这在具有不同电流密度的实验中得到了证实，在该实验中，外部电势似乎对TOrC的传输影响很小。只有当盐几乎完全耗尽时，TOrC才能作为电荷载体运输。这表明由于有机化合物的扩散性质，很难获得有机化合物的优先运输。

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  • 来源
    《Environmental Science & Technology》 |2015年第1期|489-497|共9页
  • 作者

    Marjolein Vanoppen; Annelise F.A.M. Bakelants; Dorien Gaublomme; Klaas V.K.M. Schoutteten; Julie Vanden Bussche; Lynn Vanhaecke; Arne R.D. Verliefde;

  • 作者单位

    Particle and Interfacial Technology Group, Department of Applied Analytical and Physical Chemistry, Faculty of Bioscience Engineering, Ghent University, Ghent 9000, Belgium;

    Particle and Interfacial Technology Group, Department of Applied Analytical and Physical Chemistry, Faculty of Bioscience Engineering, Ghent University, Ghent 9000, Belgium;

    Particle and Interfacial Technology Group, Department of Applied Analytical and Physical Chemistry, Faculty of Bioscience Engineering, Ghent University, Ghent 9000, Belgium;

    Particle and Interfacial Technology Group, Department of Applied Analytical and Physical Chemistry, Faculty of Bioscience Engineering, Ghent University, Ghent 9000, Belgium;

    Laboratory of Chemical Analysis, Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Merelbeke 9820, Belgium;

    Laboratory of Chemical Analysis, Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Merelbeke 9820, Belgium;

    Particle and Interfacial Technology Group, Department of Applied Analytical and Physical Chemistry, Faculty of Bioscience Engineering, Ghent University, Ghent 9000, Belgium;

  • 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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