Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 50, Issue 24, Pages 13495-13501Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.6b03424
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Funding
- Australian Research Council through ARC Linkage Project [LP150100854]
- UNSW [RG152482]
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An innovative flow electrode comprising redox-active quinones to enhance the effectiveness of water desalination using flow electrode capacitive deionization (FCDI) is described in this study. The results show that, in addition to carbon particle contact, the presence of the aqueous hydroquinone (H(2)Q)/benzoquinone (Q) couple in a flowing suspension of carbon particles enhances charge transfer significantly as a result of reversible redox reactions of H(2)Q/Q. Ion migration through the micropores of the flow electrodes was facilitated in particular with the desalination rate significantly enhanced. The cycling behavior of the quinoid mediators in the anode flow electrode demonstrated a relatively high stability at the low pH induced, suggesting that the mediator would be suitable for long-term operation.
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