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Synthesis and characterization of N,N,N′,N′-tetraalkyl-4-oxaheptanediamide as extractant for extraction of uranium(VI) and thorium(IV) ions from nitric acid solution

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Abstract

Tridentate ligand N,N,N′,N′-tetraoctyl-4-oxaheptanediamide(TOOHA) and other three analogous diamides have been prepared and characterized by using NMR spectra and element analysis. The extraction of UO2 2+ and Th4+ with the present extractants was investigated at 293 ± 1 K from nitric acid solutions. n-Octane was found to be the most suitable diluent in the present study compared with other diluents tested. Extraction distribution ratios (D) of U(VI) and Th(IV) have been studied as a function of aqueous concentrations of HNO3, extractant concentrations. The results indicated that U(VI) is mainly extracted as UO2(NO3)2·2TOOHA. In the case of Th4+ ion, the possible compositions of extracted species in organic phase were presumed to be Th(NO3)4·2TOOHA and Th(NO3)4·3TOOHA. In addition, the influence of concentration of sodium nitrate as salting-out agent on the distribution ratio of U(VI) and Th(IV) with TOOHA was also evaluated.

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Acknowledgments

We thank Major program of National Natural Science Foundation of China (21327801), National Natural Science Foundation of China (J1210001) and Natural Science Foundation of Gansu Province, China (1308RJZA145) for the financial support of this work.

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Authors and Affiliations

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

    Peng Ren, Yuan-Zhen Yue, Kun Wang, Wang-Suo Wu & Ze-Yi Yan

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  1. Peng Ren
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  2. Yuan-Zhen Yue
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  3. Kun Wang
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  4. Wang-Suo Wu
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Correspondence to Ze-Yi Yan.

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Ren, P., Yue, YZ., Wang, K. et al. Synthesis and characterization of N,N,N′,N′-tetraalkyl-4-oxaheptanediamide as extractant for extraction of uranium(VI) and thorium(IV) ions from nitric acid solution. J Radioanal Nucl Chem 300, 1099–1103 (2014). https://doi.org/10.1007/s10967-014-3069-2

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  • DOI: https://doi.org/10.1007/s10967-014-3069-2

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