Capacitive deionization (CDI) is considered an alternative desalination technology due to its easy operation, high energy efficiency, and environmentally friendly process. However, a separate regeneration step is required in typical CDI technologies that releases the absorbed ions on the electrodes which results in an inefficient and cost-intensive process. This study proposed a novel CDI system referred to as rocking-chair capacitive deionization (RCDI) that has a continuous brackish water desalination process which consists of a pair of Nafion-coated activated carbon electrodes and an anion-exchange membrane. The coated Nafion contributed to the cation selectivity of the carbon electrode, and it enabled a continuous desalination process during constant-current operation through a rocking-chair ion movement. From the desalination tests that included the analysis of the CDI Ragone plot, the RCDI has a high salt adsorption capacity (maximum of 44.5 mg g^–1) with continuous operation. Furthermore, the RCDI desalted brackish water under rapid operation conditions (up to ±30.0 A m^–2) which is a constant-current operation condition that is several times higher than that of previously reported desalination technologies using battery materials. Consequently, this study proposes a new strategy for a continuous desalination CDI system that provides a high-performance and energy-efficient desalination process for brackish water.

中文翻译：

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摇椅电容去离子连续微咸水淡化

电容去离子（CDI）由于其易于操作，高能效和环保工艺而被认为是一种替代性的脱盐技术。但是，典型的CDI技术需要单独的再生步骤，该步骤会释放电极上吸收的离子，从而导致效率低下和成本密集的过程。这项研究提出了一种称为摇椅电容去离子（RCDI）的新型CDI系统，该系统具有连续的微咸水淡化过程，该过程由一对涂有Nafion的活性炭电极和阴离子交换膜组成。涂覆的Nafion有助于碳电极的阳离子选择性，并且它通过摇椅离子运动在恒流操作过程中实现了连续的脱盐过程。^–1）连续运行。此外，RCDI在快速运行条件（高达±30.0 A m ^–2）下使微咸水脱盐，该条件是恒定电流运行条件，比先前报道的使用电池材料的脱盐技术高出几倍。因此，本研究提出了一种用于连续淡化CDI系统的新策略，该系统可为微咸水提供高性能和高能效的淡化工艺。