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Solvent extraction of uranium(VI) and thorium(IV) by N,N′-di-p-tolylpyridine-2,6-dicarboxamide from nitric acid solution

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Abstract

Synthesis and characterization of N,N′-di-p-tolylpyridine-2,6-dicarboxamide (DTPDA) was carried out and used for extraction of U(VI) and Th(IV) from nitric acid solutions. The processes of extraction were determined by the slope analysis and by analyzing a function that allows the simultaneous treatment of all the experimental points obtained in different conditions. The different factors affecting the extraction distribution ratio(D) of U(VI) and Th(IV) (extraction concentration, concentrations of nitric acid, salting-out agent NaNO3 concentration, equilibration time and temperature) were investigated. The results obtained indicated that the extraction species of U(VI) and Th(IV) are mainly extracted as UO2(NO3)2·1.5DTPDA and Th(NO3)4·1.5DTPDA. The related thermodynamic functions were calculated. Back-extraction of U(VI) and Th(IV) from organic phases was also studied.

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Acknowledgments

The authors acknowledge the National Natural Science Foundation of China (J1210001) and Fundamental Research Funds for the Central Universities (860487) for providing financial support.

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Authors and Affiliations

  1. School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, People’s Republic of China

    Peizhuo Hu, Lijuan Qian, Yuxin He, Hailong Wang & Wangsuo Wu

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  1. Peizhuo Hu
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  2. Lijuan Qian
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  3. Yuxin He
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  4. Hailong Wang
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  5. Wangsuo Wu
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Correspondence to Wangsuo Wu.

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Hu, P., Qian, L., He, Y. et al. Solvent extraction of uranium(VI) and thorium(IV) by N,N′-di-p-tolylpyridine-2,6-dicarboxamide from nitric acid solution. J Radioanal Nucl Chem 297, 133–137 (2013). https://doi.org/10.1007/s10967-012-2352-3

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  • DOI: https://doi.org/10.1007/s10967-012-2352-3

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