中文摘要：

研究了辛基（苯基）-N，N-二异丁基胺甲酰基甲基氧化膦（CMPO）．离子液体（IL）从硝酸铀酰水溶液中萃取铀（VI）的电化学行为，离子液体（1L）为1-丁基-3-甲基咪唑双三氟甲基磺酰亚胺盐（C4mimNTf2）．用等摩尔系列法测得萃取过程中CMPO与U（VI）形成摩尔比为3：1的配合物．用循环伏安法研究了萃取液中U（V1）．CMPO配合物的电化学性质，结果表明，在C4mimNTf2中U（V1）-CMPO配合物经过准可逆还原生成U（V）-CMPO配合物，U（Vi）／U（V）电对的表观氧化还原电势（Ee，VSFc／Fc^＋）为（-0．885＋0．008）V对萃取液进行控制电位电解，发现在铂片上有沉淀析出．X射线光电子能谱（XPS）测试结果表明，沉积物中只含有U（Vi）、U（BV）tI氧，而CMPO和C4mimNTf2没有被夹带析出．

英文摘要：

The electrochemical behavior of U（Vl） 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 （Ee, 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.