Highly Efficient Plutonium Extraction from Nitric Acid Feeds Using a Phosphonium Phosphinate Task-Specific Ionic Liquid DOI

Surekha D. Chowta,

Arijit Sengupta, Prasanta K. Mohapatra

et al.

Industrial & Engineering Chemistry Research, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 30, 2024

A phosphonium phosphinate-functionalized ionic liquid, Cyphos IL 104, has been evaluated for the highly efficient extraction of Pu(IV) from aqueous feeds containing nitric acid, showing various mechanisms dependent on acid concentration. At 1 M HNO3, was found to proceed via a "cation exchange" mechanism involving Pu(NO3)2[(R4P+)(R2POO–)]22+species, whereas in 7 it proceeded an "ion-pair" neutral species Pu(NO3)6(R4P+)2. separation factor Pu over U (SFPu–U = DPu/DU) be ∼2, while that Am (SFPu–Am DPu/DAm) ∼30. In case SFPu–U value increased ∼14, SFPu–Am have significantly 8400. The UO22+ and Am3+ ions followed at both acidities, albeit with different speciations. processes were spontaneous, ΔG values following trend ΔGPu > ΔGU ΔGAm. plutonium exothermic higher entropy change complexation, indicating formation inner-sphere complex. sluggish mass transfer during attributed relatively high viscosity liquid. solvent systems exhibit good radiolytic stability up 1000 kGy γ ray exposure. Three contacts complexing agents, viz. oxalic Pu4+, NaHCO3 UO22+, EDTA Am3+, successfully employed quantitative (more than 99.99%) back loaded liquid phase. system also exhibited degree recyclability five consecutive cycles.

Language: Английский

Utilizing Ionic Liquid-Dispersive Liquid-Liquid Microextraction Coupled with HPLC for the Determination of Anthraquinones in Folium Sennae DOI

Yongchao Cai,

Nan Zheng, Yao Wang

et al.

Journal of Food Composition and Analysis, Journal Year: 2025, Volume and Issue: 142, P. 107421 - 107421

Published: Feb. 27, 2025

Language: Английский

Citations

1
Effect of Structural Modification in β Diketone on the Mutual Separation of Nd and Pr into Room-Temperature Ionic Liquid DOI

Yash Bhat,

Priya Goyal,

V.S.K. Nair

et al.

Industrial & Engineering Chemistry Research, Journal Year: 2024, Volume and Issue: 63(33), P. 14863 - 14881

Published: Aug. 12, 2024

A novel approach for mutual separation between Nd and Pr has been demonstrated by the selective dissolution of Nd2O3 into an ionic liquid (C4mim·NTf2) containing two β diketones, viz., acetyl trifluoroacetone (ATA) benzoyl (BTA), directly from a physical mixture their most stable oxides, i.e., Pr6O11, avoiding cumbersome aqueous phase subsequent chemistry. The controlled release H+ ion diketones to form enolate conformation used hold dissolved Nd3+ in as (enolate diketone)4– species. over Pr6O11 can be achieved utilizing one prime driving forces difference lattice energy formation (UNd2O3 ∼ −3292.86 kJ/mol UPr6O11 −7360.45 kJ/mol, respectively). extent was found greater with BTA both compared that seen ATA. However, selectivity much better maximum factor βNd/Pr 217 using 0.1 M ATA C4mim·NTf2 1.5% water 15 min biphasic equilibration solid-to-liquid ratio 5.33 g L–1 Nd2O3/Pr6O11 2:1. factor, reported this study, more than 100 times conventional route hydrometallurgical separation. exothermic nature evidenced calorimetric experiments, estimated enthalpy being −169.23 −126.46 J/g, respectively. quantitative back extraction 0.5 HNO3 provides opportunity recycling dissolution. effects content, ATA/BTA concentration, relative Nd2O3/Pr6O11, temperature, etc., have studied understand characteristic hence achieve best rare earth metal ions.

Language: Английский

Citations

5
Ligand free extraction of tri-, tetra-, and hexa-valent actinide ions from aqueous hydrochloric acid medium using task specific ionic liquids DOI

Surekha D. Chowta,

Arijit Sengupta,

G. Sugilal

et al.

Journal of Molecular Liquids, Journal Year: 2025, Volume and Issue: unknown, P. 127324 - 127324

Published: March 1, 2025

Language: Английский

Citations

0
Complexation of Trivalent Lanthanides with Hexaalkyl Nitrilotriacetamides into Methylimidazolium-Based Ionic Liquids: Spectroscopic, Electrochemical, Calorimetric, and Theoretical Insights DOI

Priya Goyal,

Ashutosh Srivastava, Arijit Sengupta

et al.

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(46), P. 21963 - 21980

Published: Nov. 5, 2024

Exothermic, spontaneous inner-sphere complexation of trivalent lanthanides with N,N,N′,N′,N″,N″-hexaalkyl-substituted nitrilotriacetamides (HRNTAs) into 1-hexyl-3-methylimidazolium-bis(trifluoromethylsulfonyl)imide (C6mim NTf2) is reported a predominant presence ML and ML2 complexes having constants, β1Eu 3.10 ± 0.02 ,β1Nd 2.67 0.03 β2Eu 5.22 0.04, β2Nd 4.95 0.02, respectively, for the n-butyl-substituted HRNTA (HBNTA); while those n-hexyl derivative (HHNTA) are 4.27 0.03, β1Nd 3.71 7.70 7.18 respectively. HHNTA shows better complexing ability; whereas stronger Nd3+ over Eu3+ attributed to lanthanide contraction. Furthermore, nature ionic liquid also influences extent trend: C4mim NTf2 > C6mim C8mim NTf2, which follows order their dielectric constants. Judd–Ofelt parameters were calculated from photoluminescence data get an idea about symmetry complexes. Electrochemical investigations give diffusion coefficient values 1.17 × 10–7 8.26 10–8 cm2/s HBNTA HHNTA, Changes in spectral characteristics peak positions evidenced FTIR spectra on ligands NTf2. Structure optimization was performed by DFT computations.

Language: Английский

Citations

0
Highly Efficient Plutonium Extraction from Nitric Acid Feeds Using a Phosphonium Phosphinate Task-Specific Ionic Liquid DOI

Surekha D. Chowta,

Arijit Sengupta, Prasanta K. Mohapatra

et al.

Industrial & Engineering Chemistry Research, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 30, 2024

A phosphonium phosphinate-functionalized ionic liquid, Cyphos IL 104, has been evaluated for the highly efficient extraction of Pu(IV) from aqueous feeds containing nitric acid, showing various mechanisms dependent on acid concentration. At 1 M HNO3, was found to proceed via a "cation exchange" mechanism involving Pu(NO3)2[(R4P+)(R2POO–)]22+species, whereas in 7 it proceeded an "ion-pair" neutral species Pu(NO3)6(R4P+)2. separation factor Pu over U (SFPu–U = DPu/DU) be ∼2, while that Am (SFPu–Am DPu/DAm) ∼30. In case SFPu–U value increased ∼14, SFPu–Am have significantly 8400. The UO22+ and Am3+ ions followed at both acidities, albeit with different speciations. processes were spontaneous, ΔG values following trend ΔGPu > ΔGU ΔGAm. plutonium exothermic higher entropy change complexation, indicating formation inner-sphere complex. sluggish mass transfer during attributed relatively high viscosity liquid. solvent systems exhibit good radiolytic stability up 1000 kGy γ ray exposure. Three contacts complexing agents, viz. oxalic Pu4+, NaHCO3 UO22+, EDTA Am3+, successfully employed quantitative (more than 99.99%) back loaded liquid phase. system also exhibited degree recyclability five consecutive cycles.

Language: Английский

Citations

0