Institute of Solid State Physics RAS

A. N. Turanov, Leading Researcher, e-mail: turanov@issp.ac.ru

Institute of Technological Problems of Microelectronics and Superpure Materials, RAS

V. K. Karandashev, Head of Laboratory

A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences (INEOS RAS)

E. V. Sharova, Researcher

O. I. Artyushin, Senior Researcher

I. L. Odinets, Head of Laboratory

The extraction of microquantities of rare earth elements (REE(III)) from nitric acid solutions using N-alkyl- or N-aryl carbamoylmethyldiphenylphosphine oxides Ph₂P(O)CH₂C(O)NHR (R = C₄–C₁₂-alkyl, Ph, CH₂Ph) as ligands was systematically investigated in details to elucidate the influence of a ligand structure and its concentration as well as HNO₃ concentration on the extraction efficacy. The results were compared with those obtained for the neutral bidentate ligand, namely N,Ndibutylcarba moyl methyl (diphenyl)phosphine oxide. The efficacy of a ligand depends on the nature of the substituent at the nitrogen atom and increases in a series Ph < CH₂Ph < Alk. In general, elongation of N-alkyl group results in the increase of ligand lipophilic properties that, in turn, decrease its loss over the extraction from nitric acid media. The ligands with straight alkyl chain are more effective than those with alkyl chain of iso-structure. Using in concentration higher 0.1 mol/L, the corresponding N-alkyl-derivatives were found to be more effective extragents of REE(III) compared with their N-dialkylsubstituted analogs currently used in practice while at concentration equal to 0.1 mol/L the ligands of both type demonstrate the comparable efficacy. The stoichiometric composition of REE(III) complexes formed over the extraction was determined. The possibility of recovering and concentration of REE(III) from nitric acid solutions using solid-phase sorbent obtained by non-covalent attachment of Ph₂P(O)CH₂C(O)NHC₉H₁₉ on macroporous polymeric matrix have been demonstrated. Increase of HNO₃ concentration lead to increase of REE(III) recovery using the above sorbent (the equilibrium time ca. 30 min).

1. Chmutova M. K., Litvina M. N., Pribylova G. A. et al. Radiokhimiya – Radiochemistry. 1999. Vol. 41, No. 4. pp. 331–335.

2. Myasoedova G. V. Rossiyskiy Khimicheskiy Zhurnal – Russian Chemical Journal. 2005. Vol. 49, No. 2. pp. 72–75.

3. Mastryukova T. A., Artyushin O. I., Odinets I. L., Tananaev I. G. Rossiyskiy Khimicheskiy Zhurnal – Russian Chemical Journal. 2005. Vol. 49, No. 2. pp. 86–96.

4. Artyushin O. I., Sharova E. V., Odinets I. L. et al. Izvestiya Akademii Nauk. Seriya Khimicheskaya – Russian Chemical Bulletin. 2004. No. 11. pp. 2394–2402.

5. Artyushin O. I., Sharova E. V., Odinets I. L. et al. Izvestiya Akademii Nauk. Seriya Khimicheskaya – Russian Chemical Bulletin. 2006. No. 8. pp. 1387–1394.

6. Sharova E. V., Artyushin O. I., Nelyubina Yu. V. et al. Izvestiya Akademii Nauk. Seriya Khimicheskaya – Russian Chemical Bulletin. 2008. No. 9. pp. 1856–1862.

7. Shvetsov I. K., Trukhlyaev P. S., Kalistratov V. A. et al. Radiokhimiya – Radiochemistry. 1989. Vol. 31, No. 2. pp. 63–66.

8. Horwitz E. P., Dietz M. L. Anal. Chim. Acta. 1990. Vol. 238. pp. 263–271.

9. Turanov A. N., Karandashev V. K., Baulin V. E., Tsvetkov E. N. Zhurnal neorganicheskoy khimii – Russian Journal of Inorganic Chemistry. 1995. Vol. 40, No. 11. pp. 1926–1930.

10. Chmutova M. K., Litvina M. N., Pribylova G. A. et al. Radiokhimiya – Radiochemistry. 1995. Vol. 37, No. 5. pp. 430–435.

11. Rozen A. M., Berkman Z. A., Bertina L. E. et al. Radiokhimiya – Radiochemistry. 1976. Vol. 18, No. 4. pp. 493–501.

12. Horwitz E. P., Martin K. A., Diamond H., Kaplan L. Solvent Extr. Ion Exch. 1986. Vol. 4, No. 3. pp. 449–494.

13. Turanov A. N., Karandashev V. K., Bondarenko N. A. Radiokhimiya – Radiochemistry. 2007. Vol. 49, No. 1. pp. 50–57.

14. Yatsimirskiy K. B., Kostromina N. A., Sheka Z. A. et al. Khimiya kompleksnykh soedineniy redkozemelnykh metallov (Chemistry of the rare earth metals` complex compounds). Kiev : Naukova dumka, 1966. 494 p.

15. Rozen A. M., Nikolotova Z. I., Kartasheva N. A. Radiokhimiya – Radiochemistry. 1986. Vol. 28, No. 3. p. 407–423.

16. Litvina M. N., Chmutova M. K., Myasoedov B. F., Kabachnik M. I. Radiokhimiya – Radiochemistry. 1996. Vol. 38, No. 6. pp. 525–530.

17. Litvina M. N., Chmutova M. K., Kulyako Yu. M., Myasoedov B. F. Radiokhimiya – Radiochemistry. 2001. Vol. 43, No. 1. pp. 61–65.

18. Vlasov V. S., Rozen A. M. Radiokhimiya – Radiochemistry. 1988. Vol. 30, No. 1. pp. 146–147.

19. Rozen A. M., Krupnov B. V. Uspekhi Khimii – Russian Chemical Reviews. 1996. Vol. 65, No. 11. pp. 1052–1079.

20. Chmutova M. K., Kulyako Yu. M., Litvina M. N. et al. Radiokhimiya – Radiochemistry. 1998. Vol. 40, No. 3. pp. 241–247.

21. Chmutova M. K., Ivanova L. A., Myasoedov B. F. Radiokhimiya – Radiochemistry. 1995. Vol. 37, No. 5. pp. 427–429.