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Dual‐Zinc Electrode Electrochemical Desalination
Author(s) -
Dai Jinhong,
Wang Jian,
Hou Xianhua,
Ru Qiang,
He Qingyu,
Srimuk Pattarachai,
Presser Volker,
Chen Fuming
Publication year - 2020
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202000188
Subject(s) - desalination , zinc , electrode , redox , electrochemistry , chemistry , electrolyte , reverse osmosis , inorganic chemistry , chemical engineering , membrane , materials science , biochemistry , organic chemistry , engineering
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 ZnCl 2 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.