Separation and recovery of Th(IV) from rare earth and other cation solutions using pH-responsive ionic liquids at high acidity condition of 1 M HNO3

Lv, Chuan; Fu, Jie; Wang, Shuanglong; Zhang, Guo‐Hao; Guo, Shi-Jie; Li, Junling; Tao, Guo‐Hong

doi:10.1016/j.hydromet.2022.105953

Cited by 14 publications

(3 citation statements)

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“…In general, thorium could be used as a suitable model for some tetravalent actinoids, which are unstable and of course difficult to handle. Importantly, the selectivity of Th 4+ towards rare earth and transition metal ions has been observed recently to be higher than 1400 times, and the Th/Ni shows a high value of 4520 [61]. The authors investigated a new type of stimulus-responsive IL, [C 20 H 43 Cl 2 NO 4 P]NO 3 , which contains a hydrophobic long alkyl chain, hydrophilic phosphorous-oxygen groups, and a quaternary ammonium cation, which also has pH-responsive properties.…”

Section: Diluentmentioning

confidence: 98%

“…Furthermore, the last mentioned chemical element (Th) was extracted above 73% with the nine solvent systems tested regardless of the diluent's chemical nature-ionic character or molecular, polar, or non-polar diluent. In fact, thorium has received widespread attention as a potential nuclear fuel alternative, but it is still a difficult research task to extract thorium from strong HNO 3 media [61].…”

Section: Solvent Extraction and Selectivity Across The Periodic Table...mentioning

confidence: 99%

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New Sustainable Solvent Extraction Pathways for Rare Earth Metals via Oximes Molecules

Atanassova,

Kukeva,

Kurteva

2023

Molecules

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A study on the synergistic extraction of Eu(III) ions with a series of chelating ligands and determination of the process parameters is presented by employing ionic liquids and typical organic diluents. The investigations of the liquid–liquid extraction, commonly applied in the separation science of 4f and 5f-ions acidic chelating compounds, 4-benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-one (HP), 4-benzoyl-3-phenyl-5-isoxazolone (HPBI), and 2-thenoyltrifluoroacetone (HTTA) alone and in combination with two synergistic agents, meso-hexamethylpropyleneamine oxime (S2: HM-PAO) and its bis-imine precursor (S1: pre-HM-PAO), are presented. The interaction between the two extractants (acidic/neutral) in deuterochloroform was studied using 1H, 13C, and 1H-1H NOESY experiments. Several conclusions are given highlighting the role of the ionic diluent in complexation processes and selectivity with an employment of the two synergistic agents for various metal s-, p-, d-, and f-cations in the Periodic table, with almost 25 metal ions. The objective was to optimize a system for 4f-ions solvent extraction based on the new oxime molecules with β-diketone/isoxazolone/pyrazolone partnership. As detailed above, slight enhancements of extraction efficiencies were obtained either by using basic synergistic agents such as HM-PAO and/or using pre-HM-PAO. A competitive solvent extraction test of nearly 18 f-ions by various ligands (HTTA, S1, S2, and HPBI) and the two mixtures HTTA−S1 and HTTA−S2 diluted in ILs or organic diluents was also conducted in order to evaluate the switchable diluent impact. Additionally, electron paramagnetic resonance (EPR) spectroscopy was used to study the established chemical species with Cu2+ cations in the obtained organic extracts involving the two synergistic molecules.

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Section: Diluentmentioning

confidence: 98%

Section: Solvent Extraction and Selectivity Across The Periodic Table...mentioning

confidence: 99%

New Sustainable Solvent Extraction Pathways for Rare Earth Metals via Oximes Molecules

Atanassova,

Kukeva,

Kurteva

2023

Molecules

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“…[44,45] An important fact on nitrate anion based ILs needs to be emphasized here that conventional nitrate ILs are water-soluble and in order to obtain these class of ILs suited as extractant for spent fuel reprocessing, strongly hydrophobic coordination cations (e. g., [P 66614 ] + ) are generally used in combination to obtain nitrate based ILs with high hydrophobicity. [46,47] In addition, using nitrate ILs as extractants can reduce the loss of IL components to the raffinate phase during extraction process and hence diminish pollution to the system based on the common ion effect of anion (the feed phase for spent fuel extraction is a nitric acid system with high acidity) and high hydrophobicity of cation. [48] As far as Zr(IV) extraction in an ionic liquid medium is concerned, there are very few reports with different intents available in the literature.…”

Section: Introductionmentioning

confidence: 99%

Extraction and Selective Separation of Zr^IV from Ln^III/An^III Using an Undiluted Phosphonium Ionic Liquid

Rout,

Ramanathan

2023

ChemPlusChem

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Solvent extraction of Zr(IV) in an undiluted phosphonium based ionic liquid (IL) and its selective separation from Ln(III) and An(III) has been investigated in the present study. Eu(III)/Am(III) were chosen as the representative Ln(III)/An(III). Tri(hexyl)tetradecylphosphonium nitrate ( [P66614][NO3]) was chosen as IL phase and the feed phase was nitric acid containing the target metal ions. The extraction process was accomplished at different experimental parameters such as the concentration of initial nitric acid, initial feed metal concentration and equilibration time to explore the extractability of the proposed IL towards Zr(IV). The efficient extraction of Zr(IV) without any external ligand in IL phase and negligible extraction of Eu(III)/Am(III) were distinctly discerned leading to noteworthy separation factors for Zr(IV). The loading experiment revealed a noticeable growth of equilibrium concentrations of Zr(IV) in IL phase while that of Eu(III) was very less irrespective of the initial feed concentration. The association of two IL moieties in the complex formation process has been inferred. Nitrate ion was found to be superior as IL anion in terms of metal loading in comparison to other anions. Thermodynamics of extraction and the stripping of the loaded Zr(IV) from IL phase using a suitable stripping solution have also been investigated.

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Extraction, separation, recovery, transportation, ICP-AES trace determination of thorium(IV) with calix[4]resorcinarene-2, 8, 14, 20-tetrakis [N-phenylbenzo]-hydroxamic acid

Sharma,

Patadia,

Agrawal

2024

Chem. Pap.

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Separation and recovery of Th(IV) from rare earth and other cation solutions using pH-responsive ionic liquids at high acidity condition of 1 M HNO3

Cited by 14 publications

References 50 publications

New Sustainable Solvent Extraction Pathways for Rare Earth Metals via Oximes Molecules

New Sustainable Solvent Extraction Pathways for Rare Earth Metals via Oximes Molecules

Extraction and Selective Separation of Zr^IV from Ln^III/An^III Using an Undiluted Phosphonium Ionic Liquid

Extraction, separation, recovery, transportation, ICP-AES trace determination of thorium(IV) with calix[4]resorcinarene-2, 8, 14, 20-tetrakis [N-phenylbenzo]-hydroxamic acid

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Separation and recovery of Th(IV) from rare earth and other cation solutions using pH-responsive ionic liquids at high acidity condition of 1 M HNO3

Cited by 14 publications

References 50 publications

New Sustainable Solvent Extraction Pathways for Rare Earth Metals via Oximes Molecules

New Sustainable Solvent Extraction Pathways for Rare Earth Metals via Oximes Molecules

Extraction and Selective Separation of ZrIV from LnIII/AnIII Using an Undiluted Phosphonium Ionic Liquid

Extraction, separation, recovery, transportation, ICP-AES trace determination of thorium(IV) with calix[4]resorcinarene-2, 8, 14, 20-tetrakis [N-phenylbenzo]-hydroxamic acid

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Extraction and Selective Separation of Zr^IV from Ln^III/An^III Using an Undiluted Phosphonium Ionic Liquid