Novel Reuse Strategy in Flow-Electrode Capacitive Deionization with Switch Cycle Operation To Enhance Desalination Performance,Environmental Science & Technology Letters

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Novel Reuse Strategy in Flow-Electrode Capacitive Deionization with Switch Cycle Operation To Enhance Desalination Performance
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2019-11-06 , DOI: 10.1021/acs.estlett.9b00541
Sung-il Jeon ₁ , Jiho Lee ₁ , Kyusik Jo ₁ , Choonsoo Kim ₂ , Changha Lee ₁ , Jeyong Yoon _{1,

3}

Affiliation

Flow-electrode capacitive deionization (FCDI) is a promising electrochemical desalination system because of its superior desalination capacity during a continuously operating process. However, FCDI suffers from a lack of an effective reuse step for charged flow-electrodes for conducting continuous desalination despite several approaches such as mixing charged flow-electrodes [short-circuit cycle (SCC) operation] and applying a reverse voltage. Herein, we report a novel strategy termed switch cycle operation in which the charged flow-electrodes from positively and negatively biased electrode channels are swapped and supplied to oppositely biased electrode channels for the next sequential desalination step. The major results include switch cycle operation achieving the effective reuse of charged flow-electrodes for the next desalination step. The desalination performance, expressed in terms of salt removal efficiency and system current in FCDI, significantly improved by approximately 1.7 times compared with that of the SCC. This enhanced performance is attributed to the release of ions from the charged flow-electrodes that cause additional ion flux to achieve charge neutrality during the sequential desalination steps.

中文翻译：

具有开关循环操作的流动电极电容去离子的新型重用策略，可提高脱盐性能

流电极电容去离子（FCDI）是一种有前途的电化学脱盐系统，因为它在连续运行过程中具有出色的脱盐能力。然而，尽管有几种方法，例如混合带电的流动电极[短路循环（SCC）操作]和施加反向电压，FCDI仍缺乏用于带电的流动电极进行连续脱盐的有效再利用步骤。本文中，我们报告了一种称为开关循环操作的新颖策略，其中将来自正偏压和负偏压的电极通道的带电流动电极交换并提供给反偏压的电极通道，以进行下一个顺序的脱盐步骤。主要结果包括开关循环操作，可实现带电流电极的有效再利用，以进行下一个脱盐步骤。用FCDI中的除盐效率和系统电流表示的脱盐性能比SCC显着提高了约1.7倍。这种增强的性能归因于从带电的流电极释放的离子，这些离子导致附加的离子流在顺序的脱盐步骤中达到电荷中性。

更新日期：2019-11-06

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