Studies on the aggregation behaviour of radiolytically degraded tetra(2-ethyhexyl)diglycolamide in n-dodecane medium during the extraction of trivalent metal ions

Swami, K. Rama; Venkatesan, K. A.; Selvan, B. Robert

doi:10.1007/s10967-020-07200-x

Cited by 8 publications

(11 citation statements)

References 32 publications

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“…In addition, a good extractant should also possess good radiation stability when it is proposed for nuclear reprocessing applications. Several researchers studied the radiation stability of popular DGA based extractants like TODGA and TEHDGA, and it was reported that with higher radiation dose the extraction ability was diminishing due to radiolytic degradation of the extractant [27–30] . Similarly, Ravi et al .…”

Section: Introductionmentioning

confidence: 99%

Insights into the Third Phase Formation Behaviour of N,N‐Didodecyl‐N’,N’‐Dioctyl Diglycolamide in n‐Dodecane Investigated by Dynamic Light Scattering and FTIR Spectroscopy

et al. 2022

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N,N‐didodecyl‐N’,N’‐dioctyl diglycolamide (D3DODGA) was regarded as a promising ligand for the extraction of trivalent lanthanides and actinides from nuclear waste, owing to the absence of undesirable third phase formation during liquid‐liquid extraction. However, the reason for the absence of third phase formation in D3DODGA as compared to other diglycolamides was not known. To unravel the absence of third phase formation, the extraction behaviour of nitric acid and Nd(III) in 0.2 M D3DODGA in n‐dodecane (n‐DD) was studied and the reverse micellar aggregation behaviour of the organic phase was probed by dynamic light scattering (DLS) and FTIR spectroscopy. The results were compared with those obtained in popular ligands abbreviated as TODGA, TEHDGA and TDdDGA in n‐dodecane under similar conditions. The limiting reverse micellar aggregate size for third phase formation was determined to be 11.6 nm at the limiting nitric acid concentration of 0.54 M in organic phase. The investigations revealed that the absence of third phase in D3DODGA and TDdDGA was due to the presence of long chain dodecyl group attached to the molecule, as compared to the octyl moiety present in TODGA and TEHDGA. As a result, it was possible to load higher concentration of nitric acid or Nd(III) in D3DODGA without the problem of third phase formation. In view of this, the D3DODGA in n‐DD can be employed efficiently for the separation of trivalent actinides and lanthanides from nuclear waste.

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Section: Introductionmentioning

confidence: 99%

Insights into the Third Phase Formation Behaviour of N,N‐Didodecyl‐N’,N’‐Dioctyl Diglycolamide in n‐Dodecane Investigated by Dynamic Light Scattering and FTIR Spectroscopy

et al. 2022

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Section: Resultsmentioning

confidence: 99%

“…The LOC and CAC of nitric acid were determined by acid-base titration. 29,37,38 2.5 Dynamic light scattering 2.5.1 Theory of dynamic light scattering. The underlying principle of the dynamic light scattering technique is based on Brownian motion, where the reverse micellar aggregates present in the organic phase undergo a constant random motion due to collision with the solvent molecules present in the sample.…”

Section: Third Phase Formation Studiesmentioning

confidence: 99%

“…30 Similarly, Rama Swami et al reported that the formation of polar degradation products (upon irradiation) minimized the aggregation, and the production of higher homologs of n-paraffins enhanced the aggregation. 37 3.3 Aggregation behaviour in case 1 organic phase Fig. 5 shows the reverse micellar aggregate distribution of the gamma irradiated organic phase at various initial concentrations of Nd(III) in the aqueous phase (case 1).…”

Section: Nitric Acid Extraction and Aggregation Behaviourmentioning

confidence: 99%

“…Therefore, LAS is the limiting aggregate size of the organic phase for third phase formation. 37,38 Fig. 4 Average aggregate size of the nitric acid equilibrated organic phase (0.1 M TODGA/n-DD) irradiated to various absorbed gamma dose levels.…”

Section: Nitric Acid Extraction and Aggregation Behaviourmentioning

confidence: 99%

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The fate of reverse micellar aggregation in irradiated diglycolamide inn-dodecane solution

Parvathy

Prathibha

et al. 2023

New J. Chem.

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Ligand Effect on Physicochemical Properties of Ionic Liquid

Rout

Mishra

2023

ChemPhysChem

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In the solvent extraction process, the importance of an extractant (or ligand) and a diluent is inferred from their respective physicochemical properties. We have brought together all the recent results reported on the mixture of different extractants dissolved in a well-known ionic liquid diluent: 1butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C 4 mim][NTf 2 ]) in the form of a review and aimed to emphasize the role of ligand polarity and structure on the physicochemical properties of an ionic liquid (IL) diluent. Some of the most important properties such as dynamic viscosity (η), absolute density (1), energy of activation (E a ), coefficient of thermal expansion (α), phase separation time (PST), refractive index (n), etc., have been discussed meticulously in the paper. The effect of ligand structure on the aggregation behaviour of IL phase and the physicochemical properties of gamma irradiated solvent phases containing different ligands and their solution with IL phase also have been deliberated in detail.

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Studies on the aggregation behaviour of radiolytically degraded tetra(2-ethyhexyl)diglycolamide in n-dodecane medium during the extraction of trivalent metal ions

Cited by 8 publications

References 32 publications

Insights into the Third Phase Formation Behaviour of N,N‐Didodecyl‐N’,N’‐Dioctyl Diglycolamide in n‐Dodecane Investigated by Dynamic Light Scattering and FTIR Spectroscopy

Insights into the Third Phase Formation Behaviour of N,N‐Didodecyl‐N’,N’‐Dioctyl Diglycolamide in n‐Dodecane Investigated by Dynamic Light Scattering and FTIR Spectroscopy

The fate of reverse micellar aggregation in irradiated diglycolamide inn-dodecane solution

Ligand Effect on Physicochemical Properties of Ionic Liquid

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