Low energy consumption flow capacitive deionization with a combination of redox couples and carbon slurry

Wei, Qiang, Hu, Yudi, Wang, Jian, Ru, Qiang, Hou, Xianhua, Zhao, Lingzhi, Yu, Denis Y. W., San Hui, Kwan, Yan, Dongliang, Hui, Kwun Nam and Chen, Fuming (2020) Low energy consumption flow capacitive deionization with a combination of redox couples and carbon slurry. Carbon, 170. pp. 487-492. ISSN 0008-6223

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Abstract

Flow-electrode capacitive deionization (FCDI) is a new sustainable desalination technology where continuous desalination can be achieved by the electrodialysis coupling method. However, its development is hindered owing to high energy consumption and low salt removal rate. Herein, by combining ferri-/ferrocyanide redox couple with flow activated carbon (AC)/carbon black (CB) slurry, continuous desalination process is achieved with a high salt removal rate of 1.31 μg cm-2 s-1 and low energy consumption of 102.68 kJ mol-1 at the current density 2.38 mA cm-2 (50 mA current for a 21 cm2 active area). The operating voltage plateau can be reduced to 0.69 V when 10 wt% AC/CB (mass ratio of 9:1) is mixed with 20 mM/20 mM ferri-/ferrocyanide as the flow electrodes, compared with more than 3 V for only carbon flow or redox medium alone. The influences of carbon content and current densities are further investigated to so that the performances can be controlled. This work enables the development of energy-saving desalination systems by coupling FCDI with redox desalination technique.

Item Type: Article
Uncontrolled Keywords: carbon black,electrochemical desalination,flow-electrode capacitive deionization,redox desalination,chemistry(all),materials science(all) ,/dk/atira/pure/subjectarea/asjc/1600
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Depositing User: LivePure Connector
Date Deposited: 26 Aug 2020 00:03
Last Modified: 18 Sep 2020 00:30
URI: https://ueaeprints.uea.ac.uk/id/eprint/76662
DOI: 10.1016/j.carbon.2020.07.044

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