Significant Acceleration of PGMs Extraction with UCST-Type Thermomorphic Ionic Liquid at Elevated Temperature

Soma Kono; Hiroyuki Kazama; Takahiro Mori; Tsuyoshi Arai; Koichiro Takao

doi:10.1021/acssuschemeng.7b04447

Significant Acceleration of PGMs Extraction with UCST-Type Thermomorphic Ionic Liquid at Elevated Temperature

Soma Kono, Hiroyuki Kazama, Takahiro Mori, Tsuyoshi Arai, Koichiro Takao

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

12 Citations (Scopus)

Abstract

Dependency of extraction behavior of inert platinum group metals (PGMs) like Ru(III) and Rh(III) on temperature has been investigated in a biphasic system consisting of HNO₃(aq) and betainium bis(trifluoromethylsulfonyl)amide ([Hbet][Tf₂N]) ionic liquid. The extraction reactions of Ru(III) and Rh(III) took 3.5 days and 113 days, respectively, at 298 K, while equilibrated within 1 and 3 h to reach 99.2% and 96.5% extraction at 353 K. Further mechanistic studies clarified that the complexation of these PGMs and [Hbet]⁺ is rate-determining in their extraction and that it is successfully accelerated and enhanced by elevating the temperature.

Original language	English
Pages (from-to)	1555-1559
Number of pages	5
Journal	ACS Sustainable Chemistry and Engineering
Volume	6
Issue number	2
DOIs	https://doi.org/10.1021/acssuschemeng.7b04447
Publication status	Published - 2018 Feb 5

Keywords

Betainium
Ionic liquid
Platinum group
Solvent extraction
Thermomorphism
Upper critical solution temperature

ASJC Scopus subject areas

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

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title = "Significant Acceleration of PGMs Extraction with UCST-Type Thermomorphic Ionic Liquid at Elevated Temperature",

abstract = "Dependency of extraction behavior of inert platinum group metals (PGMs) like Ru(III) and Rh(III) on temperature has been investigated in a biphasic system consisting of HNO3(aq) and betainium bis(trifluoromethylsulfonyl)amide ([Hbet][Tf2N]) ionic liquid. The extraction reactions of Ru(III) and Rh(III) took 3.5 days and 113 days, respectively, at 298 K, while equilibrated within 1 and 3 h to reach 99.2% and 96.5% extraction at 353 K. Further mechanistic studies clarified that the complexation of these PGMs and [Hbet]+ is rate-determining in their extraction and that it is successfully accelerated and enhanced by elevating the temperature.",

keywords = "Betainium, Ionic liquid, Platinum group, Solvent extraction, Thermomorphism, Upper critical solution temperature",

author = "Soma Kono and Hiroyuki Kazama and Takahiro Mori and Tsuyoshi Arai and Koichiro Takao",

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T1 - Significant Acceleration of PGMs Extraction with UCST-Type Thermomorphic Ionic Liquid at Elevated Temperature

AU - Kono, Soma

AU - Kazama, Hiroyuki

AU - Mori, Takahiro

AU - Arai, Tsuyoshi

AU - Takao, Koichiro

PY - 2018/2/5

Y1 - 2018/2/5

N2 - Dependency of extraction behavior of inert platinum group metals (PGMs) like Ru(III) and Rh(III) on temperature has been investigated in a biphasic system consisting of HNO3(aq) and betainium bis(trifluoromethylsulfonyl)amide ([Hbet][Tf2N]) ionic liquid. The extraction reactions of Ru(III) and Rh(III) took 3.5 days and 113 days, respectively, at 298 K, while equilibrated within 1 and 3 h to reach 99.2% and 96.5% extraction at 353 K. Further mechanistic studies clarified that the complexation of these PGMs and [Hbet]+ is rate-determining in their extraction and that it is successfully accelerated and enhanced by elevating the temperature.

AB - Dependency of extraction behavior of inert platinum group metals (PGMs) like Ru(III) and Rh(III) on temperature has been investigated in a biphasic system consisting of HNO3(aq) and betainium bis(trifluoromethylsulfonyl)amide ([Hbet][Tf2N]) ionic liquid. The extraction reactions of Ru(III) and Rh(III) took 3.5 days and 113 days, respectively, at 298 K, while equilibrated within 1 and 3 h to reach 99.2% and 96.5% extraction at 353 K. Further mechanistic studies clarified that the complexation of these PGMs and [Hbet]+ is rate-determining in their extraction and that it is successfully accelerated and enhanced by elevating the temperature.

KW - Betainium

KW - Ionic liquid

KW - Platinum group

KW - Solvent extraction

KW - Thermomorphism

KW - Upper critical solution temperature

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