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Dual-Zinc Electrode Electrochemical Desalination

  • Abstract 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.

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Document Type:Article
Author:Jinhong Dai, Jian Wang, Xianhua Hou, Qiang Ru, Qingyu He, Pattarachai SrimukORCiD, Volker PresserORCiD, Fuming Chen
Parent Title (English):ChemSusChem
First Page:2792
Last Page:2798
Year of first Publication:2020
Release Date:2022/11/18
Impact:08.928 (2020)
Funding Information:Science and Technology Planning Project of Guangdong Province (2018A050506078)
Open Access:Open Access
Signature:INM 2020/039
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International