Synergistic extraction of tetravalent actinides by mixtures of a β-diketone and a sulfoxide

Sajun, M. S.; Ramakrishna, V.; Patil, S. K.

doi:10.1007/bf02518410

Cited by 10 publications

(4 citation statements)

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“…The valency of Pu to the +4 state was adjusted by using NaNO 2 as the redox agent and ammonium metavanadate as the holding oxidant and its conversion was checked by the TTA extraction method. 18 Radiometric assay of 233 U and Pu was done using an alpha-liquid scintillation counting system (Hidex, Finland) using an Ultima Gold scintillator cocktail (Sisco Research Laboratory, Mumbai), while that of 85,89 Sr, 137 Cs and 239 Np was done by gamma ray counting using a NaI(Tl) scintillation counter (Para Electronics, India) inter phased to a multi-channel analyzer (ECIL, India).…”

Section: Methodsmentioning

confidence: 99%

Extraction of Am(iii) using novel solvent systems containing a tripodal diglycolamide ligand in room temperature ionic liquids: a ‘green’ approach for radioactive waste processing

et al. 2012

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Extraction of Am 3+ from acidic feed solutions was investigated using novel solvent systems containing a tripodal diglycolamide (T-DGA) in three room temperature ionic liquids (RTIL), viz. [C 4 mim][NTf 2 ], [C 6 mim][NTf 2 ] and [C 8 mim][NTf 2 ]. Compared to the results obtained with N,N,N9,N9-tetra-n-octyl diglycolamide (TODGA), T-DGA gave significantly higher distribution coefficients in these RTILs. The D Am values decreased with increasing carbon chain length in the RTILs, which was related to the solubility of the RTIL in the aqueous phase. The distribution studies included the effect of equilibration time, aqueous phase acid concentration variation and T-DGA concentration variation. In general, significantly higher equilibration times were observed for the extraction systems, which was partly due to the viscous RTIL phase and partly due to the slow conformational changes of the T-DGA ligand during complexation. Apart from Am 3+ , extraction of Pu 4+ , UO 2 2+ , Eu 3+ , Sr 2+ and Cs + was also investigated, since they have significant implications in radioactive waste processing. Stripping studies indicated .99% stripping in three stages using 0.5 M EDTA or DTPA in 1 M guanidine carbonate. Slope analysis indicated the extraction of 1 : 1 complexed species of Am(III) with T-DGA. Time resolved laser fluorescence spectroscopy (TRLFS) studies showed a strong complexation with no inner-sphere water molecules in the Eu(III)-T-DGA complexes for [C 4 mim][NTf 2 ] as the diluent. Radiolytic degradation studies of the solvent systems containing T-DGA in the three RTILs were also carried out and while the D Am values decreased marginally when the solvents were exposed to 500 kGy absorbed dose, a relatively sharp decrease (60%) was seen when the solvents were exposed further to 1000 kGy absorbed dose, suggesting the possibility of recycling. Extraction studies were also carried out at varying temperatures and the thermodynamic parameters were calculated.

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Section: Methodsmentioning

confidence: 99%

Extraction of Am(iii) using novel solvent systems containing a tripodal diglycolamide ligand in room temperature ionic liquids: a ‘green’ approach for radioactive waste processing

et al. 2012

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“…TOPO, TBP, di-n-butyloctanamide, di-n-octyl sulfoxide, methylisobutylketone. [35][36][37][38]52,[97][98][99] It is known that the major factor in synergism is an increase in hydrophobic character of the extracted metal complex upon addition of the synergistic agent. So, the transformation of the self-adduct into mixed complex LnL 3 $S according to eqn (5) when 4-acylpyrazolones are applied cannot contribute to a large increase in its stability in the organic phase as both LnL 3 $HL and LnL 3 $S do not contain water molecules in the coordination sphere.…”

Section: Studying the Possible Interactions Between 4acylpyrazolones ...mentioning

confidence: 99%

Synergism as a phenomenon in solvent extraction of 4f-elements with calixarenes

Atanassova

Kurteva

2016

RSC Adv.

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“…of Np(TTA)4 in benzene upon addition of TBP was reported (Ramanujam et al 1979). In the pre~nt work, the ad.dvct formation of Np(TTA)~ with tbe neutral donors tri-n-ectylphosphine oxide (TOPO), triphenyl phosphine oxide (TPPO), di-n-butyl n-butyl phosphonate (DBBP), di-n-octyl sulphoxide (DOSO) and trin-butyl phosphate (TBP) was studied from the spectral changes and the results obtained are compared with those obtained earlier (Patil et al 1980b, d;Sajun et al 1981) by solvent extraction.…”

Section: Introductionmentioning

confidence: 94%

Spectrophotometric study of the formation of adducts between Np(TTA)4 and some neutral donors

Sajun

Ramakrishna

Patil

1981

Proc. Indian Acad. Sci. (Chem. Sci.)

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The formation of adducts between Np (TTA)~ and neutral donors ToPe, TPPO, DBBP, Dose and TBP in benzene medium has been studied by spectrephotometry and. the presence of 1 : 1 adducts is shown. From the spectral changes observed, the adduct formation constants wore evaluated and found to be 1.85 x 104 (TPPO), 4-72 • 10 ~ (DBBP) and 2"12 • 10 a (DOSe). The spectra indicated that adduct formation increases the coordination number of Np(IV)from 8 in Np(TTA)4 to 9 in the adduets formed. Data obtained using the solvent extraction method to evaluate the adduct formation constant of Np(TTA)4 with TPPO are also included.

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Synergistic extraction of tetravalent actinides by mixtures of a β-diketone and a sulfoxide

Cited by 10 publications

References 10 publications

Extraction of Am(iii) using novel solvent systems containing a tripodal diglycolamide ligand in room temperature ionic liquids: a ‘green’ approach for radioactive waste processing

Extraction of Am(iii) using novel solvent systems containing a tripodal diglycolamide ligand in room temperature ionic liquids: a ‘green’ approach for radioactive waste processing

Synergism as a phenomenon in solvent extraction of 4f-elements with calixarenes

Spectrophotometric study of the formation of adducts between Np(TTA)4 and some neutral donors

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