Direct and selective electrodeposition of palladium from betainium bis(trifluoromethanesulfonyl)imide ionic liquid phase after solvent extraction together with other platinum group metals

Soma Kono, Koichiro Takao, Tsuyoshi Arai

研究成果査読

抄録

We propose an extraction-electrodeposition process involving the solvent extraction of platinum group metals (PGMs) to an ionic liquid phase followed by the direct electrodeposition of a selected metal from the ionic liquid phase to separate and recover PGMs efficiently. To examine the compatibility of betainium bis(trifluoromethanesulfonyl)imide ionic liquid ([Hbet][Tf2N]) in this process, we investigated the electrochemical behavior of Ru(III), Rh(III), and Pd(II) actually extracted from HNO3 (aq) to the [Hbet][Tf2N] phase. Through the potentiostatic electrolysis of Pd(II) in [Hbet] [Tf2N], fine particles of Pd metal were deposited over time at applied potentials at -500, -600, and -750 mV vs Fc/Fc+. In contrast, no electrodeposition of Ru(III) and Rh(III) from [Hbet][Tf2N] solutions was observed. We also examined the potentiostatic electrolysis of a mixture of Pd(II), Ru(III), and Rh(III) in [Hbet][Tf2N] at -600 mV vs Fc/Fc+. As a result, Pd(II) was selectively electrodeposited in a nearly quantitative yield( >99%) with high purity( >97%), while little Ru and Rh were included in the deposit.

本文言語English
ページ(範囲)76-84
ページ数9
ジャーナルTransactions of the Atomic Energy Society of Japan
19
2
DOI
出版ステータスPublished - 2020

ASJC Scopus subject areas

  • 原子力エネルギーおよび原子力工学
  • 安全性、リスク、信頼性、品質管理

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