Comparison of the Extractabilities of Tetrachloro- and Tetrabromopalladate(II) Ions with a Thiodiglycolamide Compound

Narita, Hirokazu; Maeda, Motoki; Tokoro, Chiharu; Suzuki, Tomoya; Tanaka, Mikiya; Motokawa, Ryuhei; Shiwaku, Hideaki; Yaita, Tsuyoshi

doi:10.2116/analsci.33.1305

Cited by 11 publications

(2 citation statements)

References 17 publications

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“…The mixture was stirred for 4 h before filtering any undissolved Pd(NO 3 ) 2 . The resulting solution was kept at room this behavior seems to be due to the involvement of the amide groups [22]. Hence, our results indicated that the coordination of the amide oxygen atoms would depend on the HNO 3 concentration in the aqueous phase.…”

Section: Solvent Extractionmentioning

confidence: 59%

Effect of HNO3 Concentration on the Pd(II) Extraction Properties using a Thiodiglycolamide Compound

Cibula

Inaba

et al. 2019

SERDJ

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Dependence of the Pd(II) complexes extracted with N,N'-dimethyl-N,N'-ditolyl-thiodiglycolamide (MTTDGA) in chloroform on HNO 3 concentrations in the aqueous phase was investigated by liquid-liquid extraction experiments and Fourier-transform infrared spectroscopy (FT-IR) measurements. The extraction behavior of Pd(II) clearly differed between 0.5 M and 8 M HNO 3 concentrations. It took ~8 h and <5 min to attain the extraction equilibrium at 0.5 M and 8 M HNO 3 , respectively. The apparent stoichiometry of MTTDGA:Pd(II) in the extracted complexes obtained from the loading test was 1:1 at 0.5 M HNO 3 and 2:1 at 8 M HNO 3. FT-IR spectroscopy results suggested that the amide oxygen atom(s) coordinated to Pd(II) in both the 1:1 and 2:1 MTTDGA:Pd(II) complexes, but the coordination mode of the MTTDGA molecule(s) differed.

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Section: Solvent Extractionmentioning

confidence: 59%

Effect of HNO3 Concentration on the Pd(II) Extraction Properties using a Thiodiglycolamide Compound

Cibula

Inaba

et al. 2019

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“…Specifically, powdered AMP03 containing 0.75 mmol/g Pd(II) was pelletized, and 0.5 and 7.0 M HNO 3 solutions containing 25 mM and 0.1 M Pd(II), respectively, were prepared. The EXAFS spectra of the pellet and the solutions were measured and analyzed as described elsewhere [15].…”

Section: Ft-ir and Exafs Measurementsmentioning

confidence: 99%

Mechanism of Palladium(II) Adsorption from Nitric Acid Solutions by a Styrene-Divinylbenzene Copolymer Functionalized with N,N,N-Trimethylglycine

Suzuki

Narita

Ogata

et al. 2019

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The ability of AMP03, a styrene-divinylbenzene copolymer functionalized with N,N,N-trimethylglycine moieties, to adsorb Pd(II) from HNO 3 solutions was investigated to elucidate the affinity of N,N,N-trimethylglycine for Pd(II). AMP03 effectively adsorbed Pd(II) from 0.10-0.50 M solutions in HNO 3 , and the adsorption ability decreased with increasing HNO 3 concentration owing to competitive adsorption of the acid. In contrast, the presence of added NO 3 − increased the Pd(II) adsorption ability of the copolymer. On the basis of slope analysis of data for Pd(II) and HNO 3 at adsorption equilibrium, the Pd(II)/NO 3 − /ligand stoichiometry of the adsorbed Pd(II) species was determined to be 1 : 2 : 1. Structural studies performed by means of Fourier transform infrared spectroscopy and extended X-ray absorption fine structure spectroscopy revealed that the N,N,N-trimethylglycine moieties on AMP03 and NO 3 − coordinated to Pd(II) via their oxygen atoms. The adsorption selectivity of AMP03 for Pd(II), Ni(II), Cu(II), and Fe(III) was compared with the selectivities of commercially available carboxylic acid and iminodiacetic acid resins. AMP03 selectively adsorbed Pd(II) over Ni(II), Cu(II), and Fe(III) compared with that of the other resins. Our results suggest that AMP03 can be used for selective recovery of Pd(II) from HNO 3 solution.

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Precious Metal Separations

Narita

Kasuya

Suzuki

et al. 2020

Encyclopedia of Inorganic and Bioinorganic Chemistry

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Separation of precious metals (PMs) is becoming increasingly important because of their growing application in industrial products, such as electronics and catalysts. Most PM separation and purification processes are performed using acidic chloride solutions; therefore, a thorough understanding of the chemical properties and separation mechanisms of PM chloridometalates in solution is of key importance for improving these processes. This article focuses on the solvent extraction of PM ions from acidic chloride solutions as the main technology for the mutual separation of PMs. In addition, leaching methods, dominant species in acidic chloride solutions, and non‐solvent‐extraction separation methods are discussed.

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Comparison of the Extractabilities of Tetrachloro- and Tetrabromopalladate(II) Ions with a Thiodiglycolamide Compound

Cited by 11 publications

References 17 publications

Effect of HNO<sub>3</sub> Concentration on the Pd(II) Extraction Properties using a Thiodiglycolamide Compound

Effect of HNO<sub>3</sub> Concentration on the Pd(II) Extraction Properties using a Thiodiglycolamide Compound

Mechanism of Palladium(II) Adsorption from Nitric Acid Solutions by a Styrene-Divinylbenzene Copolymer Functionalized with <i>N,N,N</i>-Trimethylglycine

Precious Metal Separations

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