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

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Abstract

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)·10−2 (mol/L)0.18·min−1 at 18.0°C.

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Authors and Affiliations

  1. Department of Radiochemistry, China Institute of Atomic Energy, P.O. Box 275-26, Beijing, 102413, P.R. China

    Taihong Yan, Chen Zuo, Weifang Zheng, Guoan Ye & Xiaorong Wang

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  1. Taihong Yan
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  2. Chen Zuo
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  3. Weifang Zheng
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  4. Guoan Ye
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  5. Xiaorong Wang
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Correspondence to Taihong Yan.

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Yan, T., Zuo, C., Zheng, W. et al. Kinetics of reductive stripping of Pu(IV) in the tributylphosphate-kerosene/nitric acid-water system using dihydroxyurea. J Radioanal Nucl Chem 280, 585–588 (2009). https://doi.org/10.1007/s10967-009-7482-x

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