Extraction of U(VI), Th(IV), and REE(III) from nitrate solutions with diaryl(dialkylcarbamoylalkyl)phosphine oxides containing a dialkylcarbamoylmethyl substituent in the alkylene bridge
- Authors: Turanov A.N.1, Karandashev V.K.2,3, Yarkevich A.N.4
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Affiliations:
- Institute of Solid State Physics
- Institute of Problems of Microelectronics Technology and Ultrapure Materials
- Moscow Institute of Steel and Alloys
- Institute of Physiologically Active Compounds
- Issue: Vol 58, No 4 (2016)
- Pages: 389-393
- Section: Article
- URL: https://journals.rcsi.science/1066-3622/article/view/223424
- DOI: https://doi.org/10.1134/S106636221604007X
- ID: 223424
Cite item
Abstract
The extraction of microamounts of U(VI), Th(IV), and REE(III) from HNO3 and NH4NO3 solutions with solutions of diaryl(dialkylcarbamoylalkyl)phosphine oxides containing a dialkylcarbamoylmethyl substituent in the alkylene bridge was studied. The stoichiometry of the complexes extracted from nitric acid solutions with N,N,N',N'-tetrabutyl-2-(di-p-anisylphosphinyl)butanedioic diamide I was determined. The influence of the extractant structure and aqueous phase composition on the efficiency and selectivity of the extraction of U(VI), Th(IV), and REE(III) into the organic phase was examined. Introduction of the–CH2C(O)NAlk2 fragment into the methylene bridge of the diaryl(dialkylcarbamoylmethyl)phosphine oxide molecule considerably enhances the extraction of REE(III) from neutral nitrate solutions. Such modification of the extractant molecule only slightly influences the extraction of REE(III) from nitric acid solutions, but leads to a considerable increase in the U(VI) extraction and to a decrease in the Th(IV) extraction. The selectivity of the extraction of U(VI) and REE(III) is thus considerably increased.
About the authors
A. N. Turanov
Institute of Solid State Physics
Author for correspondence.
Email: turanov@issp.ac.ru
Russian Federation, ul. Akad. Osip’yana 2, Chernogolovka, Moscow oblast, 142432
V. K. Karandashev
Institute of Problems of Microelectronics Technology and Ultrapure Materials; Moscow Institute of Steel and Alloys
Email: turanov@issp.ac.ru
Russian Federation, ul. Akad. Osip’yana 6, Chernogolovka, Moscow oblast, 142432; Leninskii pr. 4, Moscow, 119991
A. N. Yarkevich
Institute of Physiologically Active Compounds
Email: turanov@issp.ac.ru
Russian Federation, Severnyi proezd 1, Chernogolovka, Moscow oblast, 142432