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Potential-Mediated Recycling of Copper From Brackish Water by an Electrochemical Copper Pump.

Deng, H., Wei, W., Yao, L., Zheng, Z., Li, B., Abdelkader, A. and Deng, L., 2022. Potential-Mediated Recycling of Copper From Brackish Water by an Electrochemical Copper Pump. Advanced Science, 2203189. (In Press)

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DOI: 10.1002/advs.202203189

Abstract

Copper ions (Cu2+ ) disposed to the environment at massive scale pose severe threat to human health and waste of resource. Electrochemical deionization (EDI) which captures ions by electrical field is a promising technique for water purification. However, the removal capacity and selectivity toward Cu2+ are unsatisfying, yet the recycling of the captured copper in EDI systems is yet to be explored. Herein, an efficient electrochemical copper pump (ECP) that can deliver Cu2+ from dilute brackish water into much more concentrated solutions is constructed using carbon nanosheets for the first time, which works based on reversible electrosorption and electrodeposition. The trade-off between the removal capacity and reversibility is mediated by the operation voltage. The ECP exhibits a removal capacity of 702.5 mg g-1 toward Cu2+ and a high selectivity coefficient of 64 for Cu2+ /Na+ in the presence of multiple cations; both are the highest reported to date. The energy consumption of 1.79 Wh g-1 is among the lowest for EDI of copper. More importantly, the Cu species captured can be released into a 20-fold higher concentrated solution. Such a high performance is attributed to the optimal potential distribution between the two electrodes that allows reversible electrodeposition and efficient electrosorption.

Item Type:Article
ISSN:2198-3844
Additional Information:Research Funding Shenzhen Government's Plan of Science and Technology. Grant Numbers: JCYJ20190808121407676, 20200813142301001 Natural Science Foundation of Guangdong. Grant Number: 2020A1515011127 National Natural Science Foundation of China. Grant Number: 22178223
Uncontrolled Keywords:capacitive deionization; electrochemical copper pump; electrodeposition; hierarchical porous carbon nanosheets
Group:Faculty of Science & Technology
ID Code:37404
Deposited By: Symplectic RT2
Deposited On:31 Aug 2022 15:08
Last Modified:31 Aug 2022 15:08

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