海水淡化
电容去离子
膜
卤水
渡线
涂层
离子交换
化学
稀释
化学工程
水处理
离子
材料科学
色谱法
环境工程
环境科学
热力学
有机化学
人工智能
工程类
生物化学
物理
计算机科学
作者
Alexandra Rommerskirchen,Hannah Roth,Christian J. Linnartz,Franziska Egidi,Christian Kneppeck,Florian Roghmans,Matthias Weßling
标识
DOI:10.1002/admt.202100202
摘要
Abstract Undesired water crossover through ion‐exchange membranes is a significant limitation in electrically driven desalination processes. The effect of mitigating water crossover is twofold: 1) The desalination degree is less reduced due to the unwanted removal of water, and 2) the brine concentration is increased due to decreased dilution by an unwanted crossover of water molecules. Hence, water crossover limits the desalination and concentration efficiency of the processes, while the energy demand to achieve a certain level of desalination or concentration increases. This effect is especially pronounced when treating high salinity solutions, which goes hand in hand with the crossover of many ions through the ion‐exchange membranes. A crosslinked coating for cation‐exchange membranes (CEMs) is presented in this work, which can significantly mitigate such undesired water crossover. The efficacy is demonstrated using the flow‐electrode capacitive deionization process applied for desalination and concentration of saline brines at feed concentrations of 60 and 120 g L −1 NaCl. With just a single coated CEM, the water crossover was reduced by up to 54%.
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