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Effective removal and selective capture of copper from salty solution in flow electrode capacitive deionization

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Abstract

Heavy metal removal and recovery from industrial wastewaters have aroused great concern. However, selective concentration of these target ions remains a big challenge given the high concentration of interfering ions like Na+. In this study, treatment of salty influents containing copper ions was carried out by flow-electrode capacitive deionization (FCDI) for the removal and recovery of copper. A variety of operation conditions were investigated including the operation mode of the flow electrode, applied voltage, initial pH of the flow electrode and long-term operation. Results showed that separation was achieved in the electrode chamber, since Cu2+ was preferentially deposited or adsorbed on the carbon particles while Na+ was mostly distributed in the electrolyte. This phenomenon was more evident in a short-circuited closed cycle (SCC) mode due to strong Na+ desorption. The removal efficiency of Cu2+ escalated consistently with the increase of applied voltage, and the removed Cu2+ remained in the carbon particles. The formation of Cu species could be regulated by pH adjustment, and X-ray photoelectron spectroscopy (XPS) analysis confirmed that the low initial pH of the flow electrode contributed to the production of Cu0. The Cu2+ removal performance retained ∼94% of the initial value while for Na+ only ∼90% was retained after 24-hour operation, which was related to the co-ion leakage phenomenon; the maximum loading content reached ∼5 mg Cu per g AC.

Graphical abstract: Effective removal and selective capture of copper from salty solution in flow electrode capacitive deionization

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Publication details

The article was received on 04 Jun 2019, accepted on 19 Jul 2019 and first published on 22 Jul 2019


Article type: Paper
DOI: 10.1039/C9EW00467J
Environ. Sci.: Water Res. Technol., 2019, Advance Article

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    Effective removal and selective capture of copper from salty solution in flow electrode capacitive deionization

    X. Zhang, F. Yang, J. Ma and P. Liang, Environ. Sci.: Water Res. Technol., 2019, Advance Article , DOI: 10.1039/C9EW00467J

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