Thermal-assisted back-extraction of inert platinum group metals from [Hbet][Tf<sub>2</sub>N] ionic liquid phase to oxalic acid aqueous solution

Kono, Soma; Arai, Tsuyoshi; Kohara, T.

doi:10.1080/00223131.2021.1881640

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…Besides good extraction properties, good stripping properties are also required for a promising extraction system. Sodium carbonate, oxalic acid, and thiourea have been used in the literature to study the stripping of Pd(II) from the loaded organic phase. − For sodium carbonate, it can react with Pd 2+ to produce a water-insoluble precipitate. For oxalic acid and thiourea, they can form stable complexes with Pd 2+ through strong coordination groups (CS and CO).…”

Section: Resultsmentioning

confidence: 99%

Extraction and Complexation Investigation of Palladium(II) by a Nitrilotriacetate-Derived Triamide Ligand

Wang

Song

et al. 2022

Inorg. Chem.

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Effective and selective separation and recovery of the fission product palladium from high-level liquid waste are conducive not only to reducing its hazards to the public health and environment but also to alleviate the pressure on the increasing demand for natural palladium. Herein, the Pd 2+ extraction in an HNO 3 solution with a nitrilotriacetate-derived triamide ligand NTAamide(n-Oct) and the complexation between them were investigated. Using n-octanol as a diluent, NTAamide(n-Oct) demonstrated an excellent selectivity, strong extractability, and high loading capacity for Pd 2+ extraction. Combined with the results of single-crystal X-ray diffraction, Fourier transform infrared spectroscopy, electrospray ionization-mass spectroscopy, microcalorimetric titration, and slope analysis, the extracted complexes were determined as [PdL 2 ](NO 3 ) 2 and [PdL 2 ][Pd(NO 3 ) 4 ] (where L denotes the NTAamide ligand) in 0.10 and 3.0 mol/L HNO 3 solutions, respectively. The extraction model closely depended on the solvation state of Pd 2+ in the HNO 3 solution. An ion-pair extraction model was proposed and discussed.

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Section: Resultsmentioning

confidence: 99%

Extraction and Complexation Investigation of Palladium(II) by a Nitrilotriacetate-Derived Triamide Ligand

Wang

Song

et al. 2022

Inorg. Chem.

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Extraction and separation of Pd(II) by N, N'-diethyl-N, N'-dicyclohexylmalonamide in a nitric acid system

Ling

Peng

et al. 2021

Separation and Purification Technology

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Utility of Interchangeable Coordination Modes of N,N′-Dialkyl-2,6-pyridinediamide Tridentate Pincer Ligands for Solvent Extraction of Pd(II) and Zr(IV) from High-Level Radioactive Liquid Waste

Orino,

Cao,

Tashiro

et al. 2024

Inorg. Chem.

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A new class of ligands, N,N′-dialkyl-2,6-pyridinediamide (DRPDA), has been designed with the specific intention of exhibiting interchangeable diversity in coordination modes, including organometallic interactions, for the purpose of solvent extraction of elements relevant to the proper treatment of highlevel radioactive liquid waste (HLLW) generated after nuclear fuel reprocessing. Consequently, DRPDA has been observed to extract Pd(II) and Zr(IV) from HNO 3 (aq) to 1-octanol in nearly quantitative yields when the selected ligand is sufficiently hydrophobic. However, concomitance of some of other HLLW components were also found. The extraction selectivity toward Pd(II) and Zr(IV) was markedly enhanced by employing ndodecane instead of 1-octanol as evidenced by good distribution ratios (D M ) of Pd(II) (D Pd = 72.5) and Zr(IV) (D Zr = 12.9), which is several orders of magnitude greater than D M 's of other HLLW components (10 −3 −10 −2 ), where addition of 20 vol % 1-octanol is still required to accelerate the extraction kinetics. Despite direct contact with the highly acidic aqueous phase, deprotonation from one of the amide NH moieties of DRPDA proceeds to form [Pd(DRPDA − )(NO 3 )] as a good extractables in the current biphasic system. This Pd(II) complex with a rather unique asymmetric N − ^N^O tridentate coordination was characterized by SCXRD, elemental analysis and 1 H NMR, and theoretically corroborated by DFT calculations and NBO analysis. In contrast, DRPDA also interacts with Zr 4+ in different tridentate O^N^O mode without any deprotonation. Based on mechanistic differences in the extraction chemistry we clarified, Pd(II) and Zr(IV) coextracted to the organic phase were recovered stepwise by using appropriate stripping agents such as 1.0 M HCl(aq) and 0.10 M HNO 3 (aq), respectively.

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Thermal-assisted back-extraction of inert platinum group metals from [Hbet][Tf₂N] ionic liquid phase to oxalic acid aqueous solution

Cited by 3 publications

References 15 publications

Extraction and Complexation Investigation of Palladium(II) by a Nitrilotriacetate-Derived Triamide Ligand

Extraction and Complexation Investigation of Palladium(II) by a Nitrilotriacetate-Derived Triamide Ligand

Extraction and separation of Pd(II) by N, N'-diethyl-N, N'-dicyclohexylmalonamide in a nitric acid system

Utility of Interchangeable Coordination Modes of N,N′-Dialkyl-2,6-pyridinediamide Tridentate Pincer Ligands for Solvent Extraction of Pd(II) and Zr(IV) from High-Level Radioactive Liquid Waste

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Thermal-assisted back-extraction of inert platinum group metals from [Hbet][Tf2N] ionic liquid phase to oxalic acid aqueous solution

Cited by 3 publications

References 15 publications

Extraction and Complexation Investigation of Palladium(II) by a Nitrilotriacetate-Derived Triamide Ligand

Extraction and Complexation Investigation of Palladium(II) by a Nitrilotriacetate-Derived Triamide Ligand

Extraction and separation of Pd(II) by N, N'-diethyl-N, N'-dicyclohexylmalonamide in a nitric acid system

Utility of Interchangeable Coordination Modes of N,N′-Dialkyl-2,6-pyridinediamide Tridentate Pincer Ligands for Solvent Extraction of Pd(II) and Zr(IV) from High-Level Radioactive Liquid Waste

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Thermal-assisted back-extraction of inert platinum group metals from [Hbet][Tf₂N] ionic liquid phase to oxalic acid aqueous solution