Studies on Am(III) separation from simulated high-level waste using cobalt bis(dicarbollide) (1(-)) ion derivative covalently bound to N,N'-di-n-octyl diglycol diamide as extractant and DTPA as stripping agent

0379835 - ÚACH 2013 RIV HU eng J - Journal Article
Bubeníková, M. - Selucký, P. - Rais, J. - Grüner, Bohumír - Švec, Petr
Studies on Am(III) separation from simulated high-level waste using cobalt bis(dicarbollide) (1(-)) ion derivative covalently bound to N,N'-di-n-octyl diglycol diamide as extractant and DTPA as stripping agent.
Journal of Radioanalytical and Nuclear Chemistry. Roč. 293, č. 1 (2012), s. 403-408. ISSN 0236-5731. E-ISSN 1588-2780
R&D Projects: GA ČR GA104/09/0668
Institutional research plan: CEZ:AV0Z40320502
Keywords : Solvent extraction * actinides * high-level liquid waste * dicarbollide derivatives * carboranes * TODGA * DTPA
Subject RIV: CA - Inorganic Chemistry
Impact factor: 1.467, year: 2012

The separation of minor actinides from high level liquid waste (HLLW) belongs to the principal challenges in current nuclear treatment. A derivative based on two cobalt bis(dicarbollide) (1(-)) ions covalently bound to the N,N'-di-n-octyl diglycolyl amide platform via diethyleneglycol chain with the formula {[(N,N'-(8-(OCH2 CH2)(2)-1,2-C2B9H10)(1',2'-C2B9H11)-3,3'-Co)(N,N'-n-C8H17)NCOCH2](2)O}Na-2 (TODGA-COSAN), dissolved in low polar mixture of hexyl methyl ketone and n-dodecane, was used as an extractant for efficient Am(III)/Eu(III) separation from PUREX HLLW. Am(III) could be selectively stripped from loaded organic phase by using a stripping agent composed from 0.05 M DTPA and 1 M citric acid as a buffer and 1 M NaNO3 at pH 3.0. Separation factor between europium and americium of 13 was achieved. The europium remaining in the organic phase could be consecutively effectively stripped by using solution of ammonium citrate or ammonium citrate with ammonium DTPA at pH similar to 7.
Permanent Link: http://hdl.handle.net/11104/0007119