Nandita PANDA, Nihar Bala DEVI, Sujata MISHRA

Solvent extraction of praseodymium(III) from acidic nitrate medium using Cyanex 921 and Cyanex 923 as extractants in kerosene

Solvent extraction of praseodymium(III) from acidic nitrate medium by the neutral organophosphorous extractants Cyanex 921 and Cyanex 923 in kerosene was studied. The effects of various parameters like equilibration time, nitric acid concentration, nitrate ion concentration, extractant concentration, temperature, and nature of diluents on the extraction behavior of Pr(III) were investigated. The extraction of 0.001 M Pr(III) was quantitative (93%) from the aqueous phase containing 0.001 M HNO3 and 0.1 M KNO3 using 0.5 M Cyanex 921/1 M Cyanex 923. On the basis of slope analysis, the compositions of the extracted species were formulated as Pr(NO3)3.2Cyanex 921 and Pr (NO3)3.Cyanex 923. The percentage of extraction of Pr(III) was found to decrease with increases in temperature. The standard enthalpy and entropy changes were negative owing to the complexation with decrease in randomness without a compensatory disruption of the hydration sphere of the metal ion. Mineral acids like hydrochloric acid (0.008 M) and sulfuric acid (0.03/0.02 M) were effective for the stripping of Pr(III) from the loaded organic phase with 0.5 M Cyanex 921/1 M Cyanex 923.

Anahtar Kelimeler:

Solvent extraction, Pr(III), acidic nitrate, Cyanex 921, Cyanex 923, stripping

Solvent extraction of praseodymium(III) from acidic nitrate medium using Cyanex 921 and Cyanex 923 as extractants in kerosene

Keywords:

Solvent extraction, Pr(III), acidic nitrate, Cyanex 921, Cyanex 923, stripping,

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Gschneidner, K. A.; Eyring, L.; Handbook on the Physics and Chemistry of Rare Earths; North Holland Publishing Co.: Amsterdam, the Netherlands, 1978.
Dorazio, M.; Tonarini, S. Anal. Chim. Acta 1997, 351, 325–335.
Ramendik, G. I.; Fatyushina, E. V.; Stepanov, A. I. J. Anal. Chem. 2003, 58, 152–155.
El-Hefny, N. E.; Daoud, J. A.; J. Radioanal. Nucl. Ch. 2004, 251, 451–456.
Sun, X.; Zhao, J.; Meng, S.; Li, D. Anal. Chim. Acta 2005, 533, 83–88.
Rydberg, J.; Musikas, C. G.; Choppin, R. Principles and Practices of Solvent Extraction; Marcel Dekker Inc.: New York, NY, USA, 1992.
Saeed, M. T.; Rizvi, Z. H.; Ahmad, J.; Shaheen, M .Y. J. Pak. Inst. Chem. Eng. 2009, XXXVII, 1–13. ] Dziwinski, E.; Szymanowski, J. Solv. Extr. Ion Exch. 1998, 16, 1515–1525.
Gupta, B.; Malik, P.; Deep, A. Solv. Extr. Ion Exch. 2003, 21, 239–258.
Awwad, N. S.; Gad, H. M. H.; Aly H. F. Int. J. Phys. Sci. 2008, 3, 22–27.
Liao, W.; Yu, G.; Li, D. Solv. Extr. Ion Exch. 2001, 19, 243–259.
Reddy, P. G. P.; Reddy, G. V. S.; Reddy, L. R. M.; Int. J. Sci. Adv. Technol. 2011, 1, 48–56.
Reddy, M. L. P; Luxmi Varma, R.; Ramamohan, T. R.; Sahu, S. K.; Chakravortty, V. Solv. Extr. Ion Exch. 1998, 16, 795–812.
Tong, H.; Li, D.; Wang, Y.; Lei, J.; Wuhan J. Natural Sci. 2003, 8, 871–874.
Panda, N.; Devi, N. B.; Mishra, S. J. Rare Earth. 2012, 30, 794–797.
Panda, N.; Devi, N. B.; Mishra, S. J. Radioanal. Nucl. Ch. 2013, 296, 1205–1211.
Danilov N. A., Korpusov G. V., Vinagrodov I. N., Sal’nikova E. V., Utkina O. B. Radiochemistry 2001, 43, 252–256.
Reddy, B. R.; Kumar, J. R.; Reddy, A. V. Anal. Sci. 2004, 20, 501–507.
Shuqiu, Y.; Jiayong, C. Acta Metall. Sin. 1984, 20, 342–546.
El-Nadi, Y. A. J. Rare Earth, 2010, 28, 215–220.
Desouky, A. E. O. PhD Thesis, Department of Chemistry, University of Leeds, UK, 2006.