Abstract
Kinetics of extraction and back extraction of Pr(III) and Nd(III) nitrates from aqueous electrolyte solutions with a composite material (CM) based on polymer-supported tri-n-butyl phosphate (TBP) at 293.15–333.15 K is studied. The rate-determining stage of the processes is found to be the interfacial diffusion (film kinetics). The mass-transfer coefficients are determined, and, from their temperature dependences, the apparent activation energy E a is estimated. In extraction, the mass-transfer coefficients increase in passing from aqueous solutions of Pr(III) and Nd(III) nitrates to those containing 2 M NaNO3 and with increasing temperature. For the extraction, E a is found to be 25±1 kJ mol−1, and for back extraction, 15.5±1.0 kJ mol−1. The E a values are independent of particular Ln(III).
Similar content being viewed by others
References
Barsukova, K.V., Kremlyakova, N.Yu., and Myasoedov, B.F., Radiokhimiya, 1989, vol. 31, no. 3, pp. 1–3.
Pyartman, A.K., Keskinov, V.A., Mikhailenko, M.A., et al., Radiokhimiya, 2004, vol. 46, no. 3, pp. 236–239.
Pyartman, A.K., Lishchuk, V.V., and Keskinov, V.A., Radiokhimiya, 2006, vol. 48, no. 3, pp. 252–255.
Přibil, R., Analytical Applications of EDTA and Related Compounds, Oxford: Pergamon, 1972.
Poluektov, N.S. and Kononenko, L.I., Spektrofotometricheskie metody opredeleniya individual’nykh soedinenii RZE (Spectrophotometric Determination of Individual REE Compounds), Kiev: Naukova Dumka, 1968.
Osnovy zhidkostnoi ekstraktsii (Principles of Solvent Extraction), Yagodin, G.A., Ed., Moscow: Khimiya, 1981.
Zelikman, A.I., Vol’dman, G.M., and Belyavskaya, L.V., Teoriya gidrometallurgicheskikh protsessov (Theory of Hydrometallurgical Processes), Moscow: Metallurgiya, 1975.
Author information
Authors and Affiliations
Additional information
Original Russian Text © A.K. Pyartman, V.A. Keskinov, V.V. Lishchuk, 2008, published in Radiokhimiya, 2008, Vol. 50, No. 2, pp. 137–141.
Rights and permissions
About this article
Cite this article
Pyartman, A.K., Keskinov, V.A. & Lishchuk, V.V. Kinetics of extraction and back extraction of Pr(III) and Nd(III) nitrates from aqueous electrolyte solutions with a composite material based on polymer-supported tri-n-butyl phosphate at various temperatures. Radiochemistry 50, 160–164 (2008). https://doi.org/10.1134/S1066362208020112
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1066362208020112