Dual-Zinc Electrode Electrochemical Desalination
Dual-Zinc Electrode Electrochemical Desalination
复制标题
双锌电极电化学海水淡化
DOI：
10.1002/cssc.202000188
复制
发表时间：
2020-03-19
期刊：
影响因子：
8.4
通讯作者：
Chen, Fuming
中科院分区：
文献类型：
--
作者：
Dai, Jinhong;Wang, Jian;Chen, Fuming
持续和低能耗的海水淡化技术的需求量很大，以实现可持续的水修复。我们的工作介绍了一种基于双锌电极的氧化还原反应的连续脱盐过程。该系统由两个锌箔作为氧化还原电极，具有流动的ZnCl 2电解质，浓缩和稀释的盐流，具有三个阴离子和阳离子交换膜（AEM和CEM）分离配置（AEM| CEM| AEM）。如果施加恒定电流，则负锌电极被氧化，并且电子被释放到外部电路，而正锌电极被还原，导致稀释流中的盐去除。结果表明，在连续间歇模式过程中，微咸水可以直接脱盐至380.6ppm。在0.25 mA cm（-2）的电流密度下，能量消耗可以低至35.30 kJ mol（-1），这与反渗透相当。此外，双锌电极电化学脱盐通过电极交换再生表现出优异的速率性能、可逆性和批量循环性。我们的研究为基于金属氧化还原介体的连续低能脱盐提供了一条途径。
Continuous and low-energy desalination technologies are in high demand to enable sustainable water remediation. Our work introduces a continuous desalination process based on the redox reaction of a dual-zinc electrode. The system consists of two zinc foils as redox electrodes with flowing ZnCl2 electrolyte, concentrated and diluted salt streams with three anion- and cation-exchange membranes (AEM and CEM) separated configuration (AEM|CEM|AEM). If a constant current is applied, the negative zinc electrode is oxidized, and electrons are released to the external circuit, whereas the positive zinc electrode is reduced, causing salt removal in the dilution stream. The results showed that brackish water can be directly desalted to 380.6 ppm during a continuous batch-mode process. The energy consumption can be as low as 35.30 kJ mol(-1) at a current density of 0.25 mA cm(-2), which is comparable to reverse osmosis. In addition, the dual-zinc electrode electrochemical desalination demonstrates excellent rate performance, reversibility, and batch cyclability through electrode exchange regeneration. Our research provides a route for continuous low-energy desalination based on metal redox mediators.