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

5 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

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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

Cite this

Kono, S., Kazama, H., Mori, T., Arai, T., & Takao, K. (2018). Significant Acceleration of PGMs Extraction with UCST-Type Thermomorphic Ionic Liquid at Elevated Temperature. ACS Sustainable Chemistry and Engineering, 6(2), 1555-1559. https://doi.org/10.1021/acssuschemeng.7b04447

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AU - Takao, Koichiro

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Access to Document

10.1021/acssuschemeng.7b04447