Journal
CARBON
Volume 170, Issue -, Pages 487-492Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.07.044
Keywords
Electrochemical desalination; Flow-electrode capacitive deionization; Activated carbon/carbon black; Redox desalination
Funding
- South China Normal University
- SCNU Outstanding Young Scholar Project [8S0256]
- Scientific and Technological Plan of Guangdong Province [2018A050506078, 2018B050502010, 2017A040405047]
- National Key Research and Development Program of China
- Department of Education of Guangdong Province [2018KTSCX047]
- Scientific and Technological Plan of Guangdong Province, China [2019B090905005]
- Natural Science Foundation of Guangdong province [2019A1515011615]
- Pearl River Talent Program [2019QN01L951]
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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 mg 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 cm(2) 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. (C) 2020 Elsevier Ltd. All rights reserved.
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