Kinetic and Thermodynamic Requirements to Extend Solvent Compatibility in Thermal-Assisted Extraction of Inert Platinum Group Metals

Zhiwei Zheng; Tsuyoshi Arai; Koichiro Takao

doi:10.1021/acssuschemeng.9b01622

Kinetic and Thermodynamic Requirements to Extend Solvent Compatibility in Thermal-Assisted Extraction of Inert Platinum Group Metals

Zhiwei Zheng, Tsuyoshi Arai, Koichiro Takao

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

The extraction behavior of inert platinum group metals (PGMs) like Ru(III) and Rh(III) has been investigated in a HNO₃(aq)/1-octanol system with a pyridinediamide. As a result, low efficiency of Ru(III) extraction arose from its slow kinetics at 298 K, while the situation was not improved very much even at 356 K. Addition of a hydrophobic anion like Tf₂N^- increased Ru(III) extraction up to 95% within 3 h at 356 K, where a synergistic effect would be present. Extraction of a more inert PGM like Rh(III) was also enhanced up to 90% within 2 h at 356 K in the presence of Tf₂N^-. We have successfully demonstrated the rapid and efficient extraction of inert PGMs from HNO₃(aq) to 1-octanol, which is one of the ordinary organic solvents.

Original language	English
Pages (from-to)	9750-9753
Number of pages	4
Journal	ACS Sustainable Chemistry and Engineering
Volume	7
Issue number	11
DOIs	https://doi.org/10.1021/acssuschemeng.9b01622
Publication status	Published - 2019 Jun 3

Keywords

Hydrophobic anion
Ordinary organic solvent
Platinum group metals
Solvent extraction
Thermal-assistance

ASJC Scopus subject areas

Chemistry(all)
Environmental Chemistry
Chemical Engineering(all)
Renewable Energy, Sustainability and the Environment

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10.1021/acssuschemeng.9b01622

Cite this

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title = "Kinetic and Thermodynamic Requirements to Extend Solvent Compatibility in Thermal-Assisted Extraction of Inert Platinum Group Metals",

abstract = "The extraction behavior of inert platinum group metals (PGMs) like Ru(III) and Rh(III) has been investigated in a HNO3(aq)/1-octanol system with a pyridinediamide. As a result, low efficiency of Ru(III) extraction arose from its slow kinetics at 298 K, while the situation was not improved very much even at 356 K. Addition of a hydrophobic anion like Tf2N- increased Ru(III) extraction up to 95% within 3 h at 356 K, where a synergistic effect would be present. Extraction of a more inert PGM like Rh(III) was also enhanced up to 90% within 2 h at 356 K in the presence of Tf2N-. We have successfully demonstrated the rapid and efficient extraction of inert PGMs from HNO3(aq) to 1-octanol, which is one of the ordinary organic solvents.",

keywords = "Hydrophobic anion, Ordinary organic solvent, Platinum group metals, Solvent extraction, Thermal-assistance",

author = "Zhiwei Zheng and Tsuyoshi Arai and Koichiro Takao",

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doi = "10.1021/acssuschemeng.9b01622",

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T1 - Kinetic and Thermodynamic Requirements to Extend Solvent Compatibility in Thermal-Assisted Extraction of Inert Platinum Group Metals

AU - Zheng, Zhiwei

AU - Arai, Tsuyoshi

AU - Takao, Koichiro

PY - 2019/6/3

Y1 - 2019/6/3

N2 - The extraction behavior of inert platinum group metals (PGMs) like Ru(III) and Rh(III) has been investigated in a HNO3(aq)/1-octanol system with a pyridinediamide. As a result, low efficiency of Ru(III) extraction arose from its slow kinetics at 298 K, while the situation was not improved very much even at 356 K. Addition of a hydrophobic anion like Tf2N- increased Ru(III) extraction up to 95% within 3 h at 356 K, where a synergistic effect would be present. Extraction of a more inert PGM like Rh(III) was also enhanced up to 90% within 2 h at 356 K in the presence of Tf2N-. We have successfully demonstrated the rapid and efficient extraction of inert PGMs from HNO3(aq) to 1-octanol, which is one of the ordinary organic solvents.

AB - The extraction behavior of inert platinum group metals (PGMs) like Ru(III) and Rh(III) has been investigated in a HNO3(aq)/1-octanol system with a pyridinediamide. As a result, low efficiency of Ru(III) extraction arose from its slow kinetics at 298 K, while the situation was not improved very much even at 356 K. Addition of a hydrophobic anion like Tf2N- increased Ru(III) extraction up to 95% within 3 h at 356 K, where a synergistic effect would be present. Extraction of a more inert PGM like Rh(III) was also enhanced up to 90% within 2 h at 356 K in the presence of Tf2N-. We have successfully demonstrated the rapid and efficient extraction of inert PGMs from HNO3(aq) to 1-octanol, which is one of the ordinary organic solvents.

KW - Hydrophobic anion

KW - Ordinary organic solvent

KW - Platinum group metals

KW - Solvent extraction

KW - Thermal-assistance

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JO - ACS Sustainable Chemistry and Engineering

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ER -

Kinetic and Thermodynamic Requirements to Extend Solvent Compatibility in Thermal-Assisted Extraction of Inert Platinum Group Metals

Abstract

Keywords

ASJC Scopus subject areas

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