Effect of didecylammonium Di-2-ethylhexyl sulfosuccinate on the extraction of actinides and lanthanides (iii) with tetraoctyldiglycolamide from nitric acid solutions

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Abstract

It was found that the efficiency of the extraction of lanthanide(III), americium(III), and thorium(IV) ions from nitric acid solutions with tetraoctyldiglycolamide significantly increases in the presence of an ionic liquid, didecylammonium di-2-ethylhexyl sulfosuccinate in the organic phase. The effect of the aqueous phase acidity on the distribution ratios of the extracted elements was considered, and the stoichiometry of the extracted complexes was determined.

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About the authors

A. N. Turanov

Osipyan Institute of Solid State Physics

Author for correspondence.
Email: galyna_k@mail.ru
Russian Federation, Chernogolovka

V. K. Karandashev

Institute of Microelectronics Technology and High Purity Materials, RAS

Email: galyna_k@mail.ru
Russian Federation, Chernogolovka

G. V. Kostikova

Frumkin Institute of Physical Chemistry and Electrochemistry, RAS

Email: galyna_k@mail.ru
Russian Federation, Moscow

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Supplementary files

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2. Fig. 1. Dependence of the distribution coefficients of Th(IV) (1, 5), Eu(III) (2, 3) and Am(III) (4, 6) on the concentration of HNO3 in the equilibrium aqueous phase during extraction with solutions of 0.002 mol/l TODGA in dodecane (3, 5, 6) and in dodecane containing DDAH2SSu (1, 2, 4). Concentration of DDAH2SSu, mol/l: 1 – 0.002; 2, 4 – 0.01.

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3. Fig. 2. Dependence of the distribution coefficients of Ln(III) on the concentration of HNO3 in the equilibrium aqueous phase during extraction with solutions of 0.002 mol/l TODGA in dodecane containing 0.01 mol/l DDAH2SSu.

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4. Fig. 3. Distribution coefficients of Ln(III) during extraction from 3 mol/L HNO3 solutions with 0.002 mol/L TODGA solutions in dodecane (2) and dodecane containing 0.01 mol/L DDAH2SSu (1).

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5. Fig. 4. Dependence of the distribution coefficients of Ln(III) on the concentration of H+ ions in the equilibrium aqueous phase during extraction with solutions of 0.002 mol/l TODGA in dodecane containing 0.01 mol/l DDAH2SSu, at a constant concentration of NO3– ions (5.0 mol/l).

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6. Fig. 5. Dependence of the distribution coefficients of Ln(III) on the concentration of NO3– ions in the equilibrium aqueous phase during extraction with solutions of 0.002 mol/l TODGA in dodecane containing 0.01 mol/l DDAH2SSu, at a constant concentration of H+ ions (0.5 mol/l).

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7. Fig. 6. Distribution coefficients of Ln(III) during extraction from 5 mol/L HNO3 (2, 3) and 5 mol/L NH4NO3 (1, 4) solutions with 0.002 mol/L TODGA solutions in dodecane (3, 4) and dodecane containing 0.01 mol/L DDAH2SSu (1, 2).

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8. Fig. 7. Dependence of the distribution coefficients of Th(IV) and Ln(III) on the concentration of TODGA in dodecane containing 0.01 mol/l DDAH2SSu, during extraction from 3 mol/l HNO3 solutions.

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9. Fig. 8. Dependence of the distribution coefficients of Ln(III) on the concentration of DDAH2SSu in dodecane containing 0.002 mol/l TODGA, during extraction from 1 mol/l HNO3 solutions.

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10. Scheme 1

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