Efficient electrosorption of uranyl ions by a homemade amidoxime-modified carbon paper-based electrode in acidic aqueous condition

Meng Pan, Dongxiang Zhang*, Xiyan Xu*, Alemtsehay Tesfay Reda, Jinying Li

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摘要

BACKGROUND: Electrosorption efficiency for uranyl ion (UO22+) capture is low in acid solution due to the adverse effect caused by protons. This requires novel electrodes effective at acid conditions for UO22+ electrosorption in highly acidic industrial effluents such as spent nuclear fuel treatment. RESULTS: In the current study, UO22+ electrosorption was conducted using an amidoxime-modified carbon paper (CP-AO) electrode. The effects of voltage and frequency, pH, UO22+ initial concentration, and competing ions on UO22+ electrosorption were investigated. The reusability and electrochemical properties of the CP-AO electrode were studied. The experimental results showed that the current CP-AO electrode worked well in acidic conditiona (pH = 3) with a square wave periodic voltage (SWPV, −4 V, 1000 Hz), and outperformed a previously used carbon felt-based electrode. The CP-AO electrode showed considerable selectivity toward UO22+ in the presence of competitive ions. After seven rounds of continuous electrosorption–desorption, the CP-AO electrode still showed good UO22+ uptake efficiency. The electrosorption mechanisms were studied in-depth based on experimental and characterization results. The electrosorption of UO22+ by the CP-AO electrode was due mainly to the electric field force moving UO22+ to the surface of the electrode, leading to electrodeposition of uranium compounds and the formation of electrically neutral substances. CONCLUSIONS: The results indicated that based on SWPV electrosorption the CP-AO could be a desirable treatment approach for acidic uranium-containing wastewater with promising practical applications.

源语言英语
页(从-至)2916-2929
页数14
期刊Journal of Chemical Technology and Biotechnology
96
10
DOI
出版状态已出版 - 10月 2021

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Pan, M., Zhang, D., Xu, X., Reda, A. T., & Li, J. (2021). Efficient electrosorption of uranyl ions by a homemade amidoxime-modified carbon paper-based electrode in acidic aqueous condition. Journal of Chemical Technology and Biotechnology, 96(10), 2916-2929. https://doi.org/10.1002/jctb.6847