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

被引：11

作者：

Yan Taihong ^{[1
]}

Zuo Chen ^{[1
]}

Zheng Weifang ^{[1
]}

Ye Guoan ^{[1
]}

Wang Xiaorong ^{[1
]}

机构：

[1] China Inst Atom Energy, Dept Radiochem, Beijing 102413, Peoples R China

来源：

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY | 2009年 / 280卷 / 03期

关键词：

Activation energy - Mass transfer - Process control - Rate constants - Redox reactions;

D O I：

10.1007/s10967-009-7482-x

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

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: r (0) = k'[Pu(IV)](0)[DHU](a) (0.16)[HNO3](a) (-0.34). The rate constant k' is (5.0 +/- 0.4)center dot 10(-2) (mol/L)(0.18)center dot min(-1) at 18.0A degrees C.

引用

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页码：585 / 588

页数：4

共 12 条

[1] Kinetics of reductive stripping of Pu(IV) in the tributylphosphate-kerosene/nitric acid-water system using dihydroxyurea
Taihong Yan
Chen Zuo
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Guoan Ye
Xiaorong Wang
Journal of Radioanalytical and Nuclear Chemistry, 2009, 280 : 585 - 588
[2] Kinetic studies on the stripping of thorium (IV) and uranium (IV) from tributylphosphate-kerosene with dilute nitric acid solution
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[3] Kinetic studies on the stripping of thorium(IV) and uranium(IV) from tributylphosphate-kerosene with dilute nitric acid solution
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[9] Validity of the Simple Solution Concept for the Aqueous Quaternary System U(IV) Nitrate-U(VI) Nitrate-Nitric Acid-Water
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[10] SOME FEATURES OF FORMATION AND DISSOLUTION OF A SERIES OF PU(IV) AND ZR ALKYL AND BUTYL ALKYL PHOSPHATES IN THE SYSTEM TBP N-DODECANE NITRIC-ACID WATER
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