Features of the isotopic distribution of uranium at the boundary of polar and nonpolar media

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Resumo

The adsorption process of complexes UO₂(NO₃)₂·2TBP in a heterogeneous system at the interface of polar solution of 5.6 М HNO₃ and the surface of nonpolar polypropylene(C₃H₆)ₙ is studied. The isotopic distribution of uranium changes at the vertical interface of the media. The kinetics of the extraction process of complexes UO₂(NO₃)₂·2TBP in the heterogeneous system is described by the pseudo-first-order model of Erofeev–Kolmogorov and pseudo-second-order model of Ho and McKay.

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Sobre autores

D. Rumyantseva

B.P. Konstantinov Petersburg Nuclear Physics, Institute of National Research Center “Kurchatov Institute”

Autor responsável pela correspondência
Email: rumyantseva_da@pnpi.nrcki.ru
Rússia, Gatchina, 188300

V. Zinoviev

B.P. Konstantinov Petersburg Nuclear Physics, Institute of National Research Center “Kurchatov Institute”

Email: rumyantseva_da@pnpi.nrcki.ru
Rússia, Gatchina, 188300

I. Mitropolsky

B.P. Konstantinov Petersburg Nuclear Physics, Institute of National Research Center “Kurchatov Institute”

Email: rumyantseva_da@pnpi.nrcki.ru
Rússia, Gatchina, 188300

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2. Fig. 1. Distribution of uranium concentration in the heterogeneous system (C₃H₆)ₙ–TBP–HNO₃ by the depth of the solution h. Solid lines for the phase boundary along the wall of the glass, dotted lines for the homogeneous phase in the center of the glass.

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3. Fig. 2. Change in the concentrations of isotopes ²³⁴U (left) and ²³⁵U (right) with depth h at the solid-liquid interface.

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4. Fig. 3. Distribution of the concentration of ²³⁴U (left) and ²³⁵U (right) by depth h in the aqueous phase (PP1a system) along the symmetry axis of the glass.

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5. Fig. 4. Kinetic curves of uranium isotope accumulation at the solid-liquid interface in the 7.53 M HNO₃ – TBP – (C₃H₆)ₙ system at the surface of the solution in sample PP2.

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6. Fig. 5. Parameterization of experimental data by the Langevin function for the adsorption process of isotopes ²³⁴‧²³⁵‧²³⁸U in the PP2 system.

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7. Fig. 6. Rates V(t) for the process of adsorption of isotopes 234,235,238U in the PP2 system.

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