Water electro-transport with hydrated cations in electrodialysis
Water electro-transport with hydrated cations in electrodialysis
复制标题
电渗析中水合阳离子的水电传输
DOI：
10.1016/j.desal.2015.03.007
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发表时间：
2015-06-01
期刊：
影响因子：
9.9
通讯作者：
Xu, Tongwen
中科院分区：
文献类型：
--
作者：
Jiang, Chenxiao;Wang, Qiuyue;Xu, Tongwen
电渗析（艾德）作为一种高效、低能耗、环境友好的分离脱盐技术，受到人们的广泛关注。由于从稀液流到浓液流的水输送机制的缺陷，其应用受到限制，特别是在浓缩或淡化海水/微咸水、含有生物制品的流中。本工作首次采用不同离子交换容量的离子交换膜研究了艾德膜中离子种类与水传输速率的关系。基于Nernst-Planck方程建立了WTR与IEC、膜基质骨架材料、本体溶液浓度、电解质类型等的数学模型，结果表明，艾德电渗析过程中WTR是一个非常显著的现象，不容忽视。为了减轻这种影响，应注意对膜基质材料进行改性，并选择合适的IEC或官能团或引入配体，以获得高脱盐能力和低WTR的双赢耦合。(C)2015 Elsevier B. V.版权所有。
Electrodialysis (ED), an efficient, low energy consumption and environmentally friendly separation and desalination technology, has attracted great attentions. Due to a drawback in water transport mechanism from the dilute stream to the concentrate one, its applications are limited, especially on the concentrating or desalinating seawater/brackish water, biological products-contained streams. In this work, the relationship between water transport rate (WTR) and ion species in ED was firstly studied by using ion exchange membranes with different ion exchange capacities (IECs). A mathematical model based on Nernst-Planck equation was established to further associate WTR with IECs, membrane matrix backbone materials, bulk solution concentration, electrolyte type, etc. The results indicate that WTR during ED is a Very significant phenomenon and cannot be ignored. To mitigate this effect, attention should be paid to the modification of membrane matrix materials and the selection of suitable IEC or functional groups or the introduction of ligands to obtain a win-win coupling of high desalination ability and low WTR. (C) 2015 Elsevier B.V. All rights reserved.