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
						
					
				
					
				
	        
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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 (EΘ, 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.
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								Keywords:
								
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?Uranium
, - Ionicliquid,
 - Extraction,
 - Cyclicvoltammetry,
 - Electrodeposition
 
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