Abstract
A novel hard-soft donor ligand 2,2′,2″,2‴-(((ethane-1,2-diylbis(azanediyl))bis(2-oxoethane-2,1-diyl))bis(azanetriyl))tetrakis(N,N-dibutylacetamide) (L), containing eight nitrogen atoms and six oxygen atoms, was rationally designed and synthesized for the extraction of Th(IV) from nitric acid solution. Solvent extraction studies including the effects of extraction time, acidity, nitrate ions, temperature, the concentration of ligand L, mixed ions and stripping agents on extraction behavior of Th(IV) were carried out. The results show that L exhibits higher extraction efficiency for Th(IV) than those of U(VI) over a wide range of HNO3 concentrations. Slope analysis indicates that Th(IV) is extracted as the extracted complex with a thorium/L ratio of 1:1. In addition, Th(IV) can be selectively extracted from mixed ions and easily stripped by using 2.0 mol/L Na2CO3 solution.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (Grant No. 11475120 and 11575122) and the National Fund for Fostering Talents of Basic Science of China (J1210004). Funding from the Doctor Research Foundation of Southwest University of Science and Technology (Grant 16zx7156) is gratefully acknowledged. The authors also thank the support from Comprehensive training platform of specialized laboratory, College of Chemistry, Sichuan University.
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Li, L., Ding, J., Xiao, F. et al. Design and synthesis of a novel soft-hard donor ligand for solvent extraction of Th(IV) from nitric acid media. J Radioanal Nucl Chem 312, 655–662 (2017). https://doi.org/10.1007/s10967-017-5263-5
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DOI: https://doi.org/10.1007/s10967-017-5263-5