Effect of alkyl chain length on the extraction properties of U and Th using novel CnmimNTf2/isophthalamide systems

Pandey, Amit; Hashmi, Sabiha; Kathirvelu, Velavan; Sengupta, Arijit

doi:10.1016/j.molliq.2020.114944

Cited by 16 publications

(11 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[17][18][19][20] The variation in the structural properties of the cations of ionic liquids results in the modification of the extraction mechanism, speciation and kinetics of mass transfer. [21][22][23][24] For same metal-ligand systems, changing the cations in the ionic liquids can induce 'cation exchange', 'anion exchange' and 'solvation' mechanisms involving different extracted species. 25 Although the application of ionic liquids generally improves the extraction efficiency by many folds compared to molecular diluents, a few cases have been reported in the literature, where there was no improvement in the distribution ratio values (D) of the metal ions.…”

Section: Introductionmentioning

confidence: 99%

New approach for efficient separation of U and Mo using a task-specific ionic liquid from hydrochloric acid medium: extraction and electrochemical investigation

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

New approach for efficient separation of U and Mo using a task-specific ionic liquid from hydrochloric acid medium: extraction and electrochemical investigation

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…Due to the presence of the longer n-octyl chain as compared to the n-butyl group, the aqueous solubility of the C 8 mim + ion is considered to be lower as compared to that of the C 4 mim + ion which can explain the observed behavior. 52 Figure 3d shows the typical EDXRF spectra of the aqueous phase prior and after the extraction of Nb and Ta using 100 mM of the FIL in C 4 mim•NTf 2 and C 8 mim•NTf 2 . The Nb amount was monitored using the K α ray at 16.594 keV, whereas, for Ta, the L α line at 8.114 keV was chosen.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…During the cation exchange mechanism, since the metal–ligand complex species is cationic in nature, charge neutrality after mass transfer is being maintained by an exchange of equivalent amount of the methylimidazolium ion from the ionic liquid phase to the aqueous phase. Due to the presence of the longer n -octyl chain as compared to the n -butyl group, the aqueous solubility of the C 8 mim + ion is considered to be lower as compared to that of the C 4 mim + ion which can explain the observed behavior …”

Section: Resultsmentioning

confidence: 99%

Evaluation of a Phosphinate Functionalized Ionic Liquid for the Separation of Nb and Ta from Nitric Acid Feed Conditions

Goyal,

Sengupta,

Mohapatra

2023

ACS Omega

Self Cite

View full text Add to dashboard Cite

A 'green' single-step separation process, involving a phosphonium phosphinate functionalized ionic liquid (FIL) in C 8 mim•NTf 2 , has been developed for highly encouraging improvements in the mutual separation of Nb and Ta with a maximum separation factor of ∼48 at 2 M nitric acid. The separation factor in C 4 mim•NTf 2 was found to be somewhat lower compared to that seen in C 8 mim•NTf 2 . In C 8 mim•NTf 2 , the extraction proceeded via the neutral NbOF 3 (R 4 P + )(R 2 POO − ) and TaOF 3 (R 4 P + )(R 2 POO − ) species predominated by a 'solvation' mechanism at 2 M HNO 3 , where both the cationic and anionic parts of the FIL took part in the metal ion extraction. However, in the case of C 4 mim•NTf 2 , the extraction proceeded via a cation exchange mechanism involving the mono-positive species viz.Only the phosphinate group of the FIL was directly involved in the binding to the metal ion. The charge neutrality was maintained by the exchange of the C 4 mim + ion from the ionic liquid phase to the aqueous phase. The processes were spontaneous, exothermic involving outer sphere complexation. The radiolytic stabilities of the C 8 mim•NTf 2 -based solvent systems were poorer than those of the solvents based on C 4 mim•NTf 2 . Aqueous solutions of EDTA-guanidine carbonate or DTPA-guanidine carbonate showed promising back extraction ability though three contacts of these organic phases were required for more than 99.99% stripping of the metal ion. The reusability of these solvent systems was evaluated. After four consecutive cycles, a maximum of only 8% reduction in the extraction efficiency of Ta was noticed, while for Nb it was less than 4% for Nb.

show abstract

“…These ligands were synthesized and characterized, as described in the literature. , The general procedure for synthesizing ligands involves a two-step reaction [Figure ]. Initially, thionyl chloride (40 mmol, 2.90 mL) was added to 5-bromoisophthalic acid (2 mmol, 0.490 g), and the suspension was refluxed under a nitrogen atmosphere for 16 h to give a clear solution.…”

Section: Methodsmentioning

confidence: 99%

Experimental and Theoretical Investigation on the Extractive Mass Transfer of Eu³⁺Ions Using Novel Amide Ligands in 1-Hexyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide

Ghosh,

Pandey,

Sengupta

et al. 2023

Inorg. Chem.

Self Cite

View full text Add to dashboard Cite

Novel amide ligands in the ionic liquid (1-hexyl-3methylimidazolium bis(trifluoromethylsulfonyl)imide) were utilized for the liquid−liquid biphasic mass transfer of Eu 3+ ions from aqueous acidic waste solution. The cation exchange mechanism was found to be operative with the formation of [Eu(NO 3 ) 2 L 3 ] + species (L = 4-chloro-N-(1-methyl-1H-pyrazol-3-yl)picolinamide). However, the presence of an inner-sphere water molecule was revealed by density functional theory (DFT) calculations. The viscosity-induced slower kinetics was evidenced during mass transfer, which was improved by increasing temperature. The process was exothermic in nature. The improvement in the kinetics of extractive mass transfer at higher temperatures is evinced by a reduction in the distribution ratio value. The spontaneity of the reaction was evidenced through the negative Gibbs free energy value, whereas the process enhances the entropy of the system, probably by releasing water molecules at least partially during complexation. The structures of bare ligands and complexes have been optimized by using DFT calculations. A high value of complexation energy, solvation energy, and associated enthalpy and free energy change reveal the efficacy in binding Eu with O and N donor atoms. In addition, natural population analysis, atoms-in-molecules analysis, and energy decomposition analysis have been employed to explore the nature of bonding existing in Eu−O and Eu−N bonds.

show abstract

Effect of alkyl chain length on the extraction properties of U and Th using novel CnmimNTf2/isophthalamide systems

Cited by 16 publications

References 64 publications

New approach for efficient separation of U and Mo using a task-specific ionic liquid from hydrochloric acid medium: extraction and electrochemical investigation

New approach for efficient separation of U and Mo using a task-specific ionic liquid from hydrochloric acid medium: extraction and electrochemical investigation

Evaluation of a Phosphinate Functionalized Ionic Liquid for the Separation of Nb and Ta from Nitric Acid Feed Conditions

Experimental and Theoretical Investigation on the Extractive Mass Transfer of Eu³⁺Ions Using Novel Amide Ligands in 1-Hexyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide

Contact Info

Product

Resources

About

Effect of alkyl chain length on the extraction properties of U and Th using novel CnmimNTf2/isophthalamide systems

Cited by 16 publications

References 64 publications

New approach for efficient separation of U and Mo using a task-specific ionic liquid from hydrochloric acid medium: extraction and electrochemical investigation

New approach for efficient separation of U and Mo using a task-specific ionic liquid from hydrochloric acid medium: extraction and electrochemical investigation

Evaluation of a Phosphinate Functionalized Ionic Liquid for the Separation of Nb and Ta from Nitric Acid Feed Conditions

Experimental and Theoretical Investigation on the Extractive Mass Transfer of Eu3+Ions Using Novel Amide Ligands in 1-Hexyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide

Contact Info

Product

Resources

About

Experimental and Theoretical Investigation on the Extractive Mass Transfer of Eu³⁺Ions Using Novel Amide Ligands in 1-Hexyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide