Kinetics of reductive stripping of Pu(IV) in the tributylphosphate-kerosene/nitric acid-water system using dihydroxyurea

被引：0
|
作者：
Taihong Yan
Chen Zuo
Weifang Zheng
Guoan Ye
Xiaorong Wang
机构：
[1] China Institute of Atomic Energy,Department of Radiochemistry
来源：
Journal of Radioanalytical and Nuclear Chemistry | 2009年 / 280卷
关键词：
Aqueous Phase; Organic Phase; Plutonium; Interfacial Area; Nitric Acid Solution;
D O I：
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学科分类号：
摘要：
The kinetics of the reductive stripping of plutonium(IV) by dihydroxyurea (DHU) in 30% TBP/kerosene-HNO3 system was studied with a constant interfacial area cell. The stripping rate of plutonium(IV) increases with the increase of the stirring speed of two phases and the interfacial area. The activation energy of this process is 28.4 kJ/mol. Under the given experimental conditions, the mass transfer of Pu is not controlled by redox reaction, but controlled by molecular diffusion from the organic phase to organic film layer and from the aqueous film layer to aqueous phase. The rate equation of reductive stripping (process is controlled by diffusion) was obtained as: r0 = k′[Pu(IV)]0[DHU]a0.16[HNO3]a−0.34. The rate constant k′ is (5.0±0.4)·10−2 (mol/L)0.18·min−1 at 18.0°C.
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页码：585 / 588
页数：3
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