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Extraction kinetics of lanthanum(III), uranyl(VI), and thorium(IV) nitrates from water-salt solutions using a composite based on a polymeric support and tri-n-butyl phosphate at various temperatures

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Abstract

The extraction kinetics of lanthanum(III), uranyl(VI), and thorium(IV) nitrates from water-salt solutions using a composite based on a polymeric support and tri-n-butyl phosphate (TBP) were studied at 293.15–333.15 K. Interfacial diffusion (the film kinetics) is the rate-controlling stage of extraction. Mass transfer coefficients were determined, and their temperature dependence was used to estimate apparent activation energies E a. The mass transfer coefficients increase in going from lanthanum(III), uranyl(VI), and thorium(IV) nitrate solutions to water-salt solutions containing 2 mol/L sodium nitrate or with rising temperature. E a is independent of the metal ion and the supporting electrolyte concentration; E a = 25 ± 1 kJ/mol. At a fixed temperature, the increasing order of the mass transfer coefficients is as follows: thorium(IV) < uranyl(VI) < lanthanum(III).

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Authors and Affiliations

  1. St. Petersburg State Technological Institute (Technical University), Moskovskii pr. 26, St. Petersburg, 198013, Russia

    A. K. Pyartman, V. A. Keskinov & V. V. Lishchuk

Authors
  1. A. K. Pyartman
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  2. V. A. Keskinov
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  3. V. V. Lishchuk
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Additional information

Original Russian Text © A.K. Pyartman, V.A. Keskinov, V.V. Lishchuk, 2008, published in Zhurnal Neorganicheskoi Khimii, 2008, Vol. 53, No. 10, pp. 1782–1787.

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Pyartman, A.K., Keskinov, V.A. & Lishchuk, V.V. Extraction kinetics of lanthanum(III), uranyl(VI), and thorium(IV) nitrates from water-salt solutions using a composite based on a polymeric support and tri-n-butyl phosphate at various temperatures. Russ. J. Inorg. Chem. 53, 1666–1671 (2008). https://doi.org/10.1134/S0036023608100240

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  • DOI: https://doi.org/10.1134/S0036023608100240

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