Extraction-Separation of Eu(III)/Th(IV) Ions with a Phosphorylated Ligand in an Ionic Liquid

Document Type: Research Article

Authors

1 Phase Equilibria Research Laboratory, Department of Chemistry, Faculty of Science, University of Zanjan, Zanjan, I.R. IRAN

2 NSTRI, P.O. Box 11365-8486 Tehran, I.R. IRAN

Abstract

Extraction-separation of Eu(III) and Th(IV) ions from nitrate media into the ionic liquid 1-hexyl-3-methylimidazolium hexafluorophosphate by a phosphorylated salen extractant, bis(chlorophosphoryle)decahydro-2,4-di(2-hydroxyphenyl)benzo[d][1,3,6]oxadiazepine (DPO), is investigated. It is found that Eu(III) ions are extracted via a solvation mechanism, and the extraction of Th(IV) ions proceeds through an ion exchange mechanism. The analysis of the experimental data reveals that the extraction of Eu(III) and Th(IV) ions is taken place by formation of Eu(DPO)(NO3)3 and Th(DPO)2(PF6)4 complexes. A significant selectivity towards thorium ions with respect to trivalent lanthanides (lanthanum, europium, and erbium) was observed. Thorium(IV) can be efficiently extracted from nitric acid solutions into the studied ionic liquid in the presence of DPO. 

Keywords

Main Subjects


[1] Marinsky, J. A., Marcus, Y. (Eds), “Ion Exchange and Solvent Extraction”, Marcel Dekker, New York (1974).

[2] Dam, H. H., Reinhoudt, D. N., Verboom, W., Multicoordinate Ligands for Actinide/Lanthanide Separations, Chem. Soc. Rev., 36: 367-377 (2007).

[3] Chipmen, N. A., Wai, C. M. (Eds), “Separation Techniques in Nuclear Waste Management”, CRC, Florida (1996).

[4] Rogers, R. D., Seddon, K. R., Volko, S. “Green Industrial Applications of Ionic Liquids”, Springer, Dordrecht (2012).

[6] Poole C.F., Poole S.K., Extraction of Organic Compounds with Room Temperature Ionic Liquids, J. Chromatogr. A, 1217: 2268-2286 (2010).

[7] Rout A., Venkatesan K.A., Srinivasan T.G., Vasudeva Rao P.R., Liquid-Liquid Extraction of Pu(IV), U(VI) and Am(III) Using Malonamide in Room Temperature Ionic Liquid as Diluent, J. Hazard. Mater., 221-222: 62-67 (2012).

[10] Shiri-Yekta Z., Yaftian M.R., Nilchi A., Extraction-Separation of Eu(III) and Th(IV) Ions from Nitrate Media Into A Room-Temperature Ionic Liquid, J. Iran. Chem. Soc., 10: 221-227 (2013).

[12] Dai S., Ju Y.H., Barnes C.E., Solvent Extraction of Strontium Nitrate by a Crown Ether Using Room-Temperature Ionic Liquids, J. Chem. Soc. Dalton Trans, 8: 1201-1201 (1999).

[13] Visser, A. E., Jensen, M. P., Laszak, I., Nash, K. L., Choppin, G. R., Rogers, R. D., Uranyl Coordination Environment in Hydrophobic Ionic Liquids:  An in Situ Investigation, Inorg. Chem. 42: 2197-2199 (2003).

[14] Visser A.E., Rogers R.D., Room-Temperature Ionic Liquids: New Solvents for F-Element Separations and Associated Solution ChemistryJ. Solid. State. Chem. 171: 109-113 (2003).

[15] Nakashima K., Kubota F., Maruyama T., Goto M., Feasibility of Ionic Liquids As Alternative Separation Media for Industrial Solvent Extraction Processes, Ind. Eng. Chem. Res. 44: 4368-4372 (2005).

[16] Rout A., Venkatesan K.A., Srinivasan T.G., Vasudev Rao, P. R., Extraction of Americium(III) from Nitric Acid Medium by CMPO-TBP Extractants in Ionic Liquid Diluents, Radiochim. Acta 97: 719-725 (2009).

[17] Rout V., Venkatesan K.A., Srinivasan T.G., Rao P.R.V., Extraction and Third Phase Formation behavior of Eu(III) in CMPO–TBP Extractants Present in Room Temperature Ionic Liquid, Sep. Purif. Technol. 76: 238-243 (2011).

[18] Yaftian M.R., Burgard M., Wieser C., Dieleman C.B., Extractive Properties Towards Rare-Earth Metal Ions of Calix[4]Arenes Substituted at the Narrow Rim by Phosphoryl and Amide Groups, Solvent Extr. Ion Exch. 16: 1131-1149 (1998).

[20] Yaftian M.R., Hassanzadeh L., Eshraghi M.E., Matt D., Solvent Extraction of Thorium(IV) and Europium(III) Ions by Diphenyl-N,N-dimethylcarbamoylmethylphosphine Oxide from Aqueous Nitrate Media, Sep. Purif. Technol., 31: 261-268 (2003).

[21] Yaftian M.R., Eshraghi M.E., Hassanzadeh L., Extractive Properties of Tri-n-Octylphosphine Oxide Towards Thorium(IV) and Europium(III) Ions from Nitrate Media, Iran. J. Chem. Chem. Eng. (IJCCE), 22(1): 71-76 (2003).

[22] Yaftian M.R., Taheri R., Zamani A.A., Matt D., Thermodynamics of the Solvent Extraction of Thorium and Europium Ions by Neutral Phosphorylated Ligands, J. Radioanal. Nucl. Chem. 262: 255-259 (2004).

[23] Yaftian M.R., Zamani A.A., Rostamnia S., Thorium (IV) Ion-Selective Transport Through a Bulk Liquid Membrane Containing 2-Thenoyltrifluoroacetone as Extractant-Carrier, Sep. Purif. Technol., 49: 71-75 (2006).

[24] Yaftian M.R., Razipour M.R., Matt D., Thorium(IV) and Europium(III) Ions extraction by Phosphorylated Calix[4]Arene in Dichloromethane, J. Radioanal. Nucl. Chem., 270: 357-361 (2006).

[25] Arnaud-Neu, F., Browne, J. K., Byrne, D., Marrs, D. J., McKervey, M. A., O’Hagan, P., Schwing-Weill, M. J., Walker, A., Extraction and Complexation of Akali, Alkaline Earth, and F‐Element Cations by Calixaryl Phosphine Oxides, Chem. Eur. J. 5: 175-186 (1999).

[27] Dean J.A., “Analytical Chemistry Handbook” McGraw-Hill: New York (1995).

[28] Marczenko Z., “Spectrophotometric Determination of Elements”, Wiley: New York (1976).