Recovery of platinum by solvent extraction and direct electrodeposition using ionic liquid

Matsumiya, Masahiko; Song, Yueqi; Tsuchida, Yusuke; Ota, Hisashi; Tsunashima, Katsuhiko

doi:10.1016/j.seppur.2018.06.018

Cited by 28 publications

(10 citation statements)

References 32 publications

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“…The plot of logDPt(IV) against log([R3NH + Cl -]IL/[Cl -]aq) showed a linear relationship with a slope of about 2. This trend indicated that the stoichiometry of the extractant and [PtCl6 2-]aq was 2:1, which was consistent with the extracted Pt-TOA complex [19]. Then, the intercept of the plot of logDPt(IV) vs. log([R3NH + Cl -]IL/[Cl -]aq) can be used to calculate to the equilibrium constant (logKex).…”

Section: Solvent Extractionsupporting

confidence: 59%

Electrodeposition Behavior of Extracted Platinum Complex in Phosphonium-Based Ionic Liquids Evaluated by Electrochemical Quartz Crystal Microbalance

Matsumiya

Tsuchida

Kinoshita

et al. 2021

J. Electrochem. Soc.

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It is important to develop solvent extraction and electrodeposition processes for platinum group metals in order to reduce the volume of secondary wastes. In this study, the electrodeposition behavior of the extracted Pt(IV) complex in a phosphonium-based ionic liquid (IL) was investigated by using an electrochemical quartz crystal microbalance (EQCM). The charge transfer reaction Pt(IV)+2e -→Pt(II) was observed at -0.53 V. The significant increase in the mass change (Δm) and the apparent molar mass (Mapp) of 193.7, as evaluated by the EQCM, confirmed that the electrodeposition reaction Pt(II)+2e -→Pt(0) proceeded at -1.65 V in this system. Moreover, consecutive solvent extraction and electrodeposition of Pt metal in Alamine336/IL system were performed at 10 cycles. High extraction percentage (E>95.1%) and good current efficiency (ε >85.8%) were maintained in the first to sixth cycles.The XPS Pt-4f7/2 spectrum confirmed that all the electrodeposits were in the metallic state.

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Section: Solvent Extractionsupporting

confidence: 59%

Electrodeposition Behavior of Extracted Platinum Complex in Phosphonium-Based Ionic Liquids Evaluated by Electrochemical Quartz Crystal Microbalance

Matsumiya

Tsuchida

Kinoshita

et al. 2021

J. Electrochem. Soc.

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“…The authors indicated that the trioctylamine-[P 2225 ][NTf 2 ] system provides a higher efficiency and selectivity of separation and a higher distribution ratio than the trioctylamine-kerosene system. M. Matsumiya, a Japanese scientist, used a similar system with triethyl(hexyl)phosphonium bis(trifluoromethylsulfonyl)imide [P 2226 ][NTf 2 ] for the extraction of platinum(IV) from a chloride medium [85].…”

Section: Ionic Liquids Based On the Phosphonium Cation As Diluentsmentioning

confidence: 99%

Ionic Liquids as Components of Systems for Metal Extraction

Yudaev

Chistyakov

2022

ChemEngineering

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This review addresses research and development on the use of ionic liquids as extractants and diluents in the solvent extraction of metals. Primary attention is given to the efficiency and selectivity of metal extraction from industrial wastewater with ionic liquids composed of various cations and anions. The review covers literature sources published in the period of 2010–2021. The bibliography includes 98 references dedicated to research on the extraction and separation of lanthanides (17 sources), actinides (5 sources), heavy metals (35 sources), noble metals, including the platinum group (16 sources), and some other metals.

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“…In the last decade, electrodeposition has been widely used for the purification and separation of metal ions. Many studies have reported the recovery of metals such as Cu, 22 Sr, 23 U, 24 Pt, 25 and Ru 26 through solvent extraction–direct electrodeposition. Compared with the conventional organic phase back-extraction method, direct electrodeposition can reduce the use of volatile organic solvents.…”

Section: Introductionmentioning

confidence: 99%

“…In the last decade, electrodeposition has been widely used for the purification and separation of metal ions. Many studies have reported the recovery of metals such as Cu, 22 Sr, 23 U, 24 Pt, 25 and Ru 26 1a). The characteristic UV−Vis absorption peaks of Pd(II) aqueous solution appeared at 222 and 280 nm (Figure 1b).…”

Section: Introductionmentioning

confidence: 99%

Recovery of Pd(II) from Hydrochloric Acid Medium by Solvent Extraction–Direct Electrodeposition Using Hydrophilic/Hydrophobic ILs

Shao

Jin

et al. 2020

ACS Omega

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Mixed [C 8 bet]Br/[C 4 mim][NTf 2 ] ionic liquids were used as a new extraction system to extract Pd(II) from multimetal-ion solutions. The separation factors K Pd/M (M: Cu, Fe, Ni, Zn, Co) are greater than 10 3 . Thiourea was found to be an effective stripping agent. After three cycles, the recovery efficiency was higher than 91.0%. Direct electrodeposition of palladium from the mixed ionic liquid phase was also studied. The Pd(II) complex in [C 8 bet]Br/[C 4 mim][NTf 2 ] system was studied by cyclic voltammetry at 348 K. The results indicate the existence of three types of Pd(II) complex in the [C 8 bet]Br/[C 4 mim][NTf 2 ] system, leading to three reductive waves. The reduction of Pd(II) to Pd(0) in this system is irreversible. A uniform black coating was obtained by constant-potential deposition at −1.7 V on a nickel foil, confirmed to be palladium metal by energy-dispersive spectrometry, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy analyses. After three cycles of continuous extraction–electrodeposition, over 90.0% of palladium was recovered.

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Recovery of platinum by solvent extraction and direct electrodeposition using ionic liquid

Cited by 28 publications

References 32 publications

Electrodeposition Behavior of Extracted Platinum Complex in Phosphonium-Based Ionic Liquids Evaluated by Electrochemical Quartz Crystal Microbalance

Electrodeposition Behavior of Extracted Platinum Complex in Phosphonium-Based Ionic Liquids Evaluated by Electrochemical Quartz Crystal Microbalance

Ionic Liquids as Components of Systems for Metal Extraction

Recovery of Pd(II) from Hydrochloric Acid Medium by Solvent Extraction–Direct Electrodeposition Using Hydrophilic/Hydrophobic ILs

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