Citation: WU Jing-Ke, SHEN Xing-Hai, CHEN Qing-De. Electrochemical Behavior of the System of Uranium(VI) Extraction with CMPO-Ionic Liquid[J]. Acta Physico-Chimica Sinica, ;2013, 29(08): 1705-1711. doi: 10.3866/PKU.WHXB201306043 shu

Electrochemical Behavior of the System of Uranium(VI) Extraction with CMPO-Ionic Liquid

1.
Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China

Received Date: 29 March 2013
Available Online: 4 June 2013
Fund Project: 国家自然科学基金(91226112, 20871009)资助项目 (91226112, 20871009)

The electrochemical behavior of U(VI) extracted from an aqueous solution of uranyl nitrate by octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) in an ionic liquid was investigated. The hydrophobic ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C₄mimNTf₂) was used in this study. Using an equimolar series method, we found that CMPO and U(VI) formed a 3:1 molar complex during the extraction process. Cyclic voltammetry was used to investigate the electrochemical behavior of the U(VI)-CMPO complex in C₄mimNTf₂. The U(VI)-CMPO complex was found to be quasi-reversibly reduced to a U(V)-CMPO complex. The formal redox potential (E^Θ, vs Fc/Fc⁺) for the U(VI)/U(V) couple was determined to be (-0.885±0.008) V. Controlled-potential electrolysis of the extract gave a deposit on the surface of a platinum plate. X-ray photoelectron spectroscopy showed that the deposit contained only U(VI), U(IV), and oxygen, and the CMPO extractant and the ionic liquid were not trapped in the deposit.
- ?Uranium,
- Ionicliquid,
- Extraction,
- Cyclicvoltammetry,
- Electrodeposition
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