Tuning the extraction mechanism of uranyl ion in bicyclooctanium, propylpyridinium, piperidinium and imidazolium based ionic liquids: First ever evidence of 'cation exchange', 'anion exchange' and 'solvation' mechanism

Pandey, Amit; Hashmi, Sabiha; Salunkhe, Gauri; Kathirvelu, Velavan; Chauhan, Rohit Singh; Sengupta, Arijit

doi:10.1016/j.molliq.2021.116435

Cited by 22 publications

(13 citation statements)

References 53 publications

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“…Figure 6 shows this slope analysis, where the slope of the linear regression is 1.4. Although the slope is slightly higher than the expected value, the experimental results would agree with the stoichiometry given by Eqn (9) and with previously reported results on extraction of metal ions at low pH values. 28 On the other hand, ReO − 4 is well extracted by the cation [TOMA] + , as seen in Eqn (9).…”

Section: Extraction Of Re(vii)supporting

confidence: 91%

“…Although the slope is slightly higher than the expected value, the experimental results would agree with the stoichiometry given by Eqn (9) and with previously reported results on extraction of metal ions at low pH values. 28 On the other hand, ReO − 4 is well extracted by the cation [TOMA] + , as seen in Eqn (9). This suggests the use of the IL trioctylmethylammonium chloride [TOMA][Cl] or even Aliquat 336 diluted in our proposed diluent for Re(VII) extraction instead of [TOMA][BA].…”

Section: Extraction Of Re(vii)supporting

confidence: 91%

“…An important point in this study is that selectivity was greatly increased in the extraction with IL when compared with an SX using organic diluents. Pandey et al 9 . increased the selectivity over organic solvent when using the IL 1‐ethyl‐2‐methyl pyridinium bis(trifluoromethyl sulfonyl)imide [empy][Tf 2 N] as the diluent for the extraction of uranyl ions (

normalU O_{2}^{2 +}

) and thorium ions (

normalT h^{4 +}

).…”

Section: Introductionmentioning

confidence: 99%

“…An important point in this study is that selectivity was greatly increased in the extraction with IL when compared with an SX using organic diluents. Pandey et al 9 increased the selectivity over organic solvent when using the IL 1-ethyl-2-methyl pyridinium bis(trifluoromethyl sulfonyl)imide [empy][Tf 2 N] as the diluent for the extraction of uranyl ions (UO 2+ 2 ) and thorium ions (Th 4+ ). Finally, Atanassova 10 provides an extensive review on the SX of lanthanides and actinides with ILs where, in some cases, ILs improve selectivity over molecular solvents.…”

Section: Introductionmentioning

confidence: 99%

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Rhenium(VII) extraction from sulfuric aqueous solutions using ionic liquids as diluent and extractant: insights on the extraction stoichiometry and process parameters

Quijada‐Maldonado

Román

Merlet

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND Rhenium(Re) is a highly valuable metal recovered from molybdenite leach liquors by solvent extraction (SX) using toxic organic solvents. This work proposes an extracting phase free of volatile organics composed by the ionic liquid (IL) trioctylmethylammonium benzoate [TOMA][BA] as the extractant, due to its ability to extract Re(VII), and the IL 1‐octyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide [omim][Tf2N] as the diluent, due to its high hydrophobicity where the extraction stoichiometry and process parameters such as the initial pH, the extractant concentration in the diluent and stripping using ammonium hydroxide (boldNH4boldOH) and sodium hydroxide (boldNaOH) were assessed. RESULTS This extracting phase yielded high extraction percentages: 95% with only 3% (v/v) of [TOMA][BA] in [omim][Tf2N]. A detailed study of the SX stoichiometry was carried out through slope analysis, showing that the SX occurs in two steps: first, the extraction of acid; then, the extraction of the metal ion via anion exchange with the transfer of IL‐diluent anion to the aqueous phase. Additionally, the extracting phase was tested in a synthetic molybdenite leached pregnant leach solution, showing selectivity towards Re(VII) over Cu(II) and Fe(III) at very low extractant concentration. The stripping of Re(VII) from the loaded phase was also studied achieving 60% stripping in only one equilibrium step when using boldNH4boldOH. CONCLUSION This novel extracting phase, free of volatile organic, shows promising Re(VII) extraction for future industrial applications. © 2021 Society of Chemical Industry (SCI).

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Section: Extraction Of Re(vii)supporting

confidence: 91%

Section: Extraction Of Re(vii)supporting

confidence: 91%

normalU O_{2}^{2 +}

) and thorium ions (

normalT h^{4 +}

).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Rhenium(VII) extraction from sulfuric aqueous solutions using ionic liquids as diluent and extractant: insights on the extraction stoichiometry and process parameters

Quijada‐Maldonado

Román

Merlet

et al. 2022

J of Chemical Tech & Biotech

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“…In molecular diluent, the extraction was proposed to occur through neutral species by solvation mechanism. 60,61 The mechanism can be explained by the following equation…”

Section: Resultsmentioning

confidence: 99%

Utilization of ionic liquids for preferential separation of thorium during the determination of trace metallic constituents in thorium matrix using ICP-OES

Pathak

Jayabun

Sengupta

2022

J. Anal. At. Spectrom.

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Remarkably High Separation of Neodymium from Praseodymium by Selective Dissolution from their Oxide Mixture using an Ionic Liquid Containing aβ‐Diketone

Sengupta,

Goyal,

Prava Mantry

et al. 2024

Chemistry A European J

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A simple, efficient, and economical method for the mutual separation of Nd and Pr was developed by the selective dissolution of Nd2O3 directly from their oxide mixtures in an ionic liquid containing 2‐thenoyltrifluoroacetone (HTTA) resulting in an unprecedented separation factor (βNd/Pr) > 500, which is 277 times more than the thus far reported βNd/Pr values. The proposed mechanism was supported by DFT computations.

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Tuning the extraction mechanism of uranyl ion in bicyclooctanium, propylpyridinium, piperidinium and imidazolium based ionic liquids: First ever evidence of 'cation exchange', 'anion exchange' and 'solvation' mechanism

Cited by 22 publications

References 53 publications

Rhenium(VII) extraction from sulfuric aqueous solutions using ionic liquids as diluent and extractant: insights on the extraction stoichiometry and process parameters

Rhenium(VII) extraction from sulfuric aqueous solutions using ionic liquids as diluent and extractant: insights on the extraction stoichiometry and process parameters

Utilization of ionic liquids for preferential separation of thorium during the determination of trace metallic constituents in thorium matrix using ICP-OES

Remarkably High Separation of Neodymium from Praseodymium by Selective Dissolution from their Oxide Mixture using an Ionic Liquid Containing aβ‐Diketone

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