TY - JOUR
T1 - Extraction of alkaline earth and actinide cations by mixtures of di(2-ethylhexyl) alkylenediphosphonic acids and neutral synergists
AU - McAlister, D. R.
AU - Chiarizia, R.
AU - Dietz, M. L.
AU - Herlinger, A. W.
AU - Zalupski, P. R.
N1 - Funding Information:
This work was funded by the Office of Basic Energy Sciences, Division of Chemical Sciences, US Department of Energy under contract number W-31-109-ENG-38. The authors thank Paul G. Rickert of ANL for the preparation and purification of the extractants used in this work and Dr. Richard A. Bartsch of Texas Tech University, Lubbock, Texas, for kindly providing a sample of DCH21C7.
Funding Information:
*Corresponding author. E-mail: [email protected] {This work was performed under the auspices of the Office of Basic Energy Sciences, Division of Chemical Sciences, US Department of Energy, under contract W-31-109-ENG-38. The submitted manuscript has been created by the University of Chicago as Operator of Argonne National Laboratory (‘‘Argonne’’) under Contract No. W-31-109-ENG-38 with the US Department of Energy. The US Government retains for itself, and others acting on its behalf, a paid-up, nonexclusive, irrevocable worldwide license in said article to reproduce, prepare derivative works, distribute copies to the public, and perform publicly and display publicly, by or on behalf of the Government.
PY - 2002/7
Y1 - 2002/7
N2 - The synergistic extraction of alkaline earth (Ca2+, Sr2+, Ba2+ and Ra2+) and actinide (Am3+, UO22+ and Th4+) cations from aqueous nitric acid solutions by mixtures of P,P′-di(2-ethylhexyl) methylene-(H2DEH[MDP]), ethylene-(H2DEH[EDP]), and butylene- (H2DEH[BuDP]) diphosphonic acids and neutral extractants in o-xylene has been investigated. The cis-syn-cis and cis-anti-cis stereoisomers of dicyclohexano-18-crown-6 (DCH18C6), the unsubstituted 21-crown-7 (21C7) and dicyclohexano-21-crown-7 (DCH21C7) were used as neutral synergists of the crown ether type. For Am(III) synergistic effects were also investigated using neutral organophosphorus esters, such as, tri-n-butylphosphate (TBP), diamyl amylphosphonate (DA[AP]) and tri-n-octylphosphine oxide (TOPO) as co-extractants. In all systems investigated, no synergistic extraction enhancement was observed for actinide ions. For the alkaline earth cations, synergistic effects were only observed when mixtures of H2DEH[EDP] or H2DEH[BuDP] with DCH18C6 were used to extract Sr2+, Ba2+ and Ra2+. No synergistic effects were observed for the extraction of alkaline earth cations by H2DEH[MDP] or for the extraction of Ca2+ by any of the diphosphonic acids studied. The synergistic effects obtained with DCH18C6 were significantly higher for the cis-syn-cis than for the cis-anti-cis stereoisomer.
AB - The synergistic extraction of alkaline earth (Ca2+, Sr2+, Ba2+ and Ra2+) and actinide (Am3+, UO22+ and Th4+) cations from aqueous nitric acid solutions by mixtures of P,P′-di(2-ethylhexyl) methylene-(H2DEH[MDP]), ethylene-(H2DEH[EDP]), and butylene- (H2DEH[BuDP]) diphosphonic acids and neutral extractants in o-xylene has been investigated. The cis-syn-cis and cis-anti-cis stereoisomers of dicyclohexano-18-crown-6 (DCH18C6), the unsubstituted 21-crown-7 (21C7) and dicyclohexano-21-crown-7 (DCH21C7) were used as neutral synergists of the crown ether type. For Am(III) synergistic effects were also investigated using neutral organophosphorus esters, such as, tri-n-butylphosphate (TBP), diamyl amylphosphonate (DA[AP]) and tri-n-octylphosphine oxide (TOPO) as co-extractants. In all systems investigated, no synergistic extraction enhancement was observed for actinide ions. For the alkaline earth cations, synergistic effects were only observed when mixtures of H2DEH[EDP] or H2DEH[BuDP] with DCH18C6 were used to extract Sr2+, Ba2+ and Ra2+. No synergistic effects were observed for the extraction of alkaline earth cations by H2DEH[MDP] or for the extraction of Ca2+ by any of the diphosphonic acids studied. The synergistic effects obtained with DCH18C6 were significantly higher for the cis-syn-cis than for the cis-anti-cis stereoisomer.
UR - http://www.scopus.com/inward/record.url?scp=0036660946&partnerID=8YFLogxK
U2 - 10.1081/SEI-120014367
DO - 10.1081/SEI-120014367
M3 - Article
AN - SCOPUS:0036660946
SN - 0736-6299
VL - 20
SP - 447
EP - 469
JO - Solvent Extraction and Ion Exchange
JF - Solvent Extraction and Ion Exchange
IS - 4-5
ER -