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

Bubeníková, Mária; Selucký, P.; Rais, J.; Grüner, Bohumı́r

doi:10.1007/s10967-012-1679-0

Cited by 8 publications

(4 citation statements)

References 17 publications

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“…It is important to note that both TODGA and T2EHDGA based processes have been successfully demonstrated for An separation from fission products on a laboratory scale using centrifugal contactors − and an extraction system containing TODGA for the Am/Ln separation. , These solvents utilize a phase modifier (octanol, isodecanol, tributyl phosphate (TBP), or N , N -dihexyloctanamide (DHOA)) to prevent third phase formation at high metal and nitric acid loading. The concentrations of the DGA’s in the reported processes are in the 0.05–0.2 M range in the case of TODGA and 0.1–0.2 M in the case of T2EHDGA.…”

Section: Resultsmentioning

confidence: 99%

Actinide Lanthanide Separation Process—ALSEP

Gelis

Lumetta

2014

Ind. Eng. Chem. Res.

173

136

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Separation of the minor actinides (Am, Cm) from the lanthanides at an industrial scale remains a significant technical challenge for closing the nuclear fuel cycle. To increase the safety of used nuclear fuel (UNF) reprocessing, as well as reduce associated costs, a novel solvent extraction process has been developed. The process allows for partitioning minor actinides, lanthanides, and fission products following uranium/plutonium/neptunium removal, minimizing the number of separation steps, flowsheets, chemical consumption, and waste. This new process, actinide lanthanide separation (ALSEP), uses an organic solvent consisting of a neutral diglycolamide extractant, either N,N,N′,N′-tetra(2-ethylhexyl)diglycolamide (T2EHDGA) or N,N,N′,N′-tetraoctyldiglycolamide (TODGA), and an acidic extractant 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (HEH[EHP]), dissolved in an aliphatic diluent (e.g., n-dodecane). The An/Ln coextraction is conducted from moderate-to-strong nitric acid, while the selective stripping of the minor actinides from the lanthanides is carried out using a polyaminocarboxylic acid/citrate buffered solution at pH anywhere between 3 and 4.5. The extraction and separation of the actinides from the fission products is very effective in a wide range of HNO3 concentrations, and the minimum separation factors for lanthanide/Am exceed 30 for Nd/Am, reaching >60 for Eu/Am under some conditions. The experimental results presented here demonstrate the great potential for a combined system, consisting of a neutral extractant such as T2EHDGA or TODGA, and an acidic extractant such as HEH[EHP], for separating the minor actinides from the lanthanides.

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Section: Resultsmentioning

confidence: 99%

Actinide Lanthanide Separation Process—ALSEP

Gelis

Lumetta

2014

Ind. Eng. Chem. Res.

173

136

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“…The search for chemically based alternatives to the burial of HLW in deep repositories is ongoing, and among the most effective methods, originating with Czech workers in the 1970s, 148 Bifunctional extraction agents that contain both cobaltacarborane and CMPO or similar groups efficiently remove lanthanides and actinides from highly acidic nuclear waste. 154 Metal ion separation technology has been advanced by several recent modifications, including the development of membrane-based systems which require less solvent and generate less waste than solvent extraction or ion exchange methods. 26 illustrates two such species, employing calix [4] arene 153,158 (a) and N,N,N′,N′-tetraoctyldiglycolamide (TODGA) (b) assemblies, the first of which, employed with t-octylbenzo-18-crown-6, complexes strongly with Cs + ions 153 while the latter efficiently separates Am(III) and Eu(III).…”

Section: Carboranes In Metal Ion Extractionmentioning

confidence: 99%

“…26 illustrates two such species, employing calix [4] arene 153,158 (a) and N,N,N′,N′-tetraoctyldiglycolamide (TODGA) (b) assemblies, the first of which, employed with t-octylbenzo-18-crown-6, complexes strongly with Cs + ions 153 while the latter efficiently separates Am(III) and Eu(III). 154 Metal ion separation technology has been advanced by several recent modifications, including the development of membrane-based systems which require less solvent and generate less waste than solvent extraction or ion exchange methods. In an electrolytic process for extracting cesium from nuclear waste, Cs + ions complexed with 3-Co(1,2-C 2 B 9 H 8 Cl 3 ) 2 − anions are selectively transported with 100% efficiency through cellulose triacetate (CTA) and polyvinyl chloride (PVC) polymer inclusion membranes.…”

Section: Carboranes In Metal Ion Extractionmentioning

confidence: 99%

Carboranes in the chemist's toolbox

2015

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Once seldom encountered outside of a few laboratories, carboranes are now everywhere, playing a role in the development of a broad range of technologies encompassing organic synthesis, radionuclide handling, drug design, heat-resistant polymers, cancer therapy, nanomaterials, catalysis, metal-organic frameworks, molecular machines, batteries, electronic devices, and more. This perspective highlights selected examples in which the special attributes of carboranes and metallacarboranes are being exploited for targeted purposes in the laboratory and in the wider world.

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“…It was shown that CCD can effectively cross the phase boundary and its combination with a neutral ligand promotes extraction both through solvation and cation-exchange mechanisms [22]. Therefore, cobalt dicarbollide (CD) ions were covalently bonded with neutral ligands, and the extracting properties of such pre-organized molecules were studied [23][24][25][26]. It was shown that compounds with CD covalently bonded with diglycol amides are more efficient for the extraction of Eu (III) and Am (III) than the mixture of TODGA and CCD [25].…”

Section: Introductionmentioning

confidence: 99%

Modified Diamide and Phosphine Oxide Extracting Compounds as Membrane Components for Cross-Sensitive Chemical Sensors

et al. 2019

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This research is devoted to the development and study of novel cross-sensitive sensors based on modified extracting ligands. According to the previous results of liquid extraction studies, the chemical modification of membrane active components would change the analytical characteristics of a sensor comprising them. The sensing elements of the studied sensors consisted of various derivatives of N,N,N′,N′-tetraoctyldiamide of diglycolic acid (TODGA) and di-phenyl-N,N-di-i-sobutylcarbamoylmethylen phoshine oxide (CMPO) used as neutral carriers, CCD (chlorinated cobalt dicarbollide) as a lipophilic additive, different plasticizers, and poly(vinyl chloride) (PVC) as a polymer. TODGA-based sensors demonstrated a stable and reproducible response towards rare earth cations in acidic media (pH = 2). Changing the concentrations and ratio of neutral carriers and the lipophilic additive, it is possible to modify the sensitivity and selectivity of the sensors towards the same target ions. Bonded ligands, such as cobalt dicarbollide covalently attached to TODGA and CMPO, exhibited lower selectivity and sensitivity to rare earth cations. A possibility to vary the cross-sensitivity patterns of the sensors in a wide range might be of great interest for the development of multisensor systems allowing the simultaneous determination of several analytes in multicomponent solutions.

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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

Cited by 8 publications

References 17 publications

Actinide Lanthanide Separation Process—ALSEP

Actinide Lanthanide Separation Process—ALSEP

Carboranes in the chemist's toolbox

Modified Diamide and Phosphine Oxide Extracting Compounds as Membrane Components for Cross-Sensitive Chemical Sensors

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