Impact of ionic liquids on europium and americium extraction by an upper rim phosphorylated calixarene
The solvent extraction of europium and americium using the calixarene 5,11,17,23-tetrakis[dipropylphosphinylmethyl] 25,26,27,28-tetrapropoxycalixarene (conical conformation) in the presence of ionic liquids with different natures was studied. It was shown that upper rim phosphorylated calixarene is able to extract europium and americium from nitric acid to dichloroethane by forming a 1:1 complex without the addition of ionic liquids. The distribution coefficients of americium are higher than those of europium in this case, but the isolation degrees of both elements are insufficient for this system to be useful in extraction technologies. The addition of the ionic liquid trihexyl(tetradecyl)phosphonium hexafluorophosphate increases the europium distribution coefficient by values ranging from twofold to more than two orders of magnitude at ionic liquid concentrations of 1 and 50 %, respectively. The values of the distribution coefficients for americium are increased by approximately 25-fold after a 50 % addition of the ionic liquid.
KeywordsActinides Solvent extraction Ionic liquids Calix[n]arene
This work was performed with support from the Federal Program “Investigations and Developments” by the Russian Ministry of Education and Science (Agreement No. 14.604.21.0095) and the Russian Basic Research Foundation (14-05-00181).
- 1.Karavan M, Arnaud-Neu F, Hubscher-Bruder V, Smirnov IV, Kalchenko V (2009) Novel phosphorylated calixarenes for the recognition of f-elements. J Incl Phenom Macrocycl Chem 23:200–210Google Scholar
- 2.Smirnov I, Karavan M, Babain V, Kvasnitskiy I, Stoyanov E, Miroshnichenko S (2007) Effect of alkyl substituents on extraction properties and solubility of calixarene dialkylphosphine oxides. Radiochim Acta 95:97–102Google Scholar
- 3.Ludwig R, Nguyen TKD, Kunogi K, Tachimory S (1998) Proc. 2nd Intern. Symp. NUCEF’98 on Safety Research and Development of Base Technology on Nucl. Fuel Cycle. Hitachivaha. Ibaraki. 1998. Nov. 16Google Scholar
- 6.Lumetta GJ, Rogers RD, Gopalan AS (2000) Calixarenes for separation. ACS Symposium Series. Am Chem Soc Washington. DC. 757Google Scholar
- 7.Romanovsky VN, Shadrin AY, Zilberman BY, Babanin VA, Smirnov IV, Shmidt OV (2004) Extraction recovery of long-lived radionuclids from high-active wastes. Radiat Saf 33:6Google Scholar
- 9.Wasserscheid P and Welton T (2002) Ionic Liquids in Synthesis. Wiley-VCH, Verlag GmbH & Co. KgaA. WeinheimGoogle Scholar
- 11.Nikolotova ZI, Kartashova NA (1976) Extraction by neutral organic compounds. Atomizdat, Moscow, p 588Google Scholar
- 12.Carda-Broch S, Berthod A, Armstrong DW (2003) Solvent properties of the l-butyl-3-methylimidazolium hexafluorophosphate ionic liquid. II Anal Bioanal Chem 375:191–199Google Scholar
- 14.Freire MG, Carvalho PJ, Silva AMS, Santos LMNBF, Rebelo LPN, Marrucho IM, Coutinho JAP (2009) Ion Specific Effects on the Mutual Solubilities of Water and Hydrophobic Ionic Liquids J Phys Chem B. 113:202–211Google Scholar