TitleCMPO-离子液体萃取分离铀(Ⅵ)体系的电化学性质
Other TitlesElectrochemical Behavior of System of Uranium(Ⅵ)Extraction with CMPO-Ionic Liquid
Authors吴京珂
沈兴海
陈庆德
Affiliation北京大学化学与分子工程学院,放射化学与辐射化学重点学科实验室,北京分子科学国家实验室,北京100871
Keywords
离子液体
萃取
循环伏安
电沉积
Uranium
Ionic liquid
Extraction
Cyclic voltammetry
Electrodeposition
Issue Date2013
Publisher物理化学学报
Citation物理化学学报.2013,29,(8),1705-1711.
Abstract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(IL)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(Ⅵ)-CMPO配合物的电化学性质,结果表明,在C4mimNTf2中U(Ⅵ)-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(E(-),vs Fc/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(Ⅳ)和氧,而CMPO和C4mimNTf2没有被夹带析出.
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 (C(4)mimNTf(2)) 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 C(4)mimNTf(2). The U(VI)-CMPO complex was found to be quasi-reversibly reduced to a U(V)-CMPO complex. The formal redox potential (E-circle minus, 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.
URIhttp://hdl.handle.net/20.500.11897/79214
ISSN1000-6818
DOI10.3866/PKU.WHXB201306043
IndexedSCI(E)
中文核心期刊要目总览(PKU)
中国科技核心期刊(ISTIC)
中国科学引文数据库(CSCD)
Appears in Collections:化学与分子工程学院

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