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首页> 美国卫生研究院文献>Membranes >Characterization of MK-40 Membrane Modified by Layers of Cation Exchange and Anion Exchange Polyelectrolytes
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Characterization of MK-40 Membrane Modified by Layers of Cation Exchange and Anion Exchange Polyelectrolytes

机译：阳离子交换和阴离子交换聚电解质层修饰的MK-40膜的表征

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摘要

Coating of ion exchange membranes used in electrodialysis with layers of polyelectrolytes is a proven approach that allows for the increasing of the limiting current, the suppressing of sedimentation, the controlling of the intensity of generation of H and OH ions, and also the improving of monovalent selectivity. However, in the case when two materials with the opposite sign of the charge of fixed groups come in contact, a bipolar boundary is created that can cause undesirable changes in the membrane properties. In this work, we used a MK-40 heterogeneous membrane on the surface of which a layer of polyethyleneimine was applied by adsorption from a solution as a model of heterogeneous membranes modified with oppositely charged polyelectrolyte. It was found that, on one hand, the properties of modified membrane were beneficial for electrodialysis, its limiting current did not decrease and the membrane even acquired a barrier to non-selective electrolyte transport. At the same time, the generation of H and OH ions of low intensity arose, even in underlimiting current modes. It was also shown that despite the presence of a layer of polyethyleneimine, the surface charge of the modified membrane remained negative, which we associate with low protonation of polyethyleneimine at neutral pH.
机译：在电渗析中用聚电解质层涂覆离子交换膜是一种行之有效的方法，可以增加极限电流，抑制沉淀，控制H和OH离子的产生强度，并改善单价。选择性。但是，当两种带有固定基团电荷的相反符号的材料接触时，会形成双极性边界，从而导致膜性能发生不良变化。在这项工作中，我们使用了一种MK-40异质膜，在其表面上通过从溶液中吸附来涂覆一层聚乙烯亚胺，以此作为带相反电荷的聚电解质改性的异质膜的模型。已经发现，一方面，改性膜的性质对于电渗析是有利的，其极限电流没有降低，并且膜甚至获得了对非选择性电解质运输的屏障。同时，即使在极限电流模式下，也会产生低强度的H和OH离子。还显示，尽管存在聚乙烯亚胺层，但改性膜的表面电荷仍然为负，这与聚乙烯亚胺在中性pH下的低质子化有关。

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