Extraction behavior of a novel functionalized ionic liquid for separation of platinum group metals from aqueous nitric acid solution | Zendy

Tatsuya Itô | Zendy; Haruka Oosugi | Zendy; Naoki Osawa | Zendy; Tadayuki Takahashi | Zendy; Seong-Yun Kim | Zendy; Ryuji Nagaishi | Zendy

Open Access

Extraction behavior of a novel functionalized ionic liquid for separation of platinum group metals from aqueous nitric acid solution

Author(s) -

Tatsuya Itô,

Haruka Oosugi,

Naoki Osawa,

Tadayuki Takahashi,

Seong-Yun Kim,

Ryuji Nagaishi

Publication year - 2021

Publication title -

analytical sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.392

H-Index - 73

eISSN - 1348-2246

pISSN - 0910-6340

DOI - 10.2116/analsci.21p057

Subject(s) - chemistry , nitric acid , extraction (chemistry) , ionic liquid , aqueous solution , platinum group , platinum , liquid–liquid extraction , palladium , nuclear chemistry , inorganic chemistry , chromatography , catalysis , organic chemistry

A novel ionic liquid (IL) functionalized with thiodiglycol amic acid containing a soft S donor was synthesized for the effective and efficient extraction of platinum group metals (Ru, Rh, and Pd) from aqueous nitric acid solutions, such as high-level radioactive liquid waste (HLLW). The IL enabled rapid extraction of Pd(II) with an extraction ratio of approximately 100%. The extractions of Ru(III) and Rh(III) by the IL were slower than that of Pd(II), but the rates were accelerated by temperature elevation. The extractions of Ru(III) and Rh(III) at 50 °C reached equilibrium within 4 and 8 h, respectively, with the extraction ratios of over 90% without assisting agents or other methods for the extraction system. Furthermore, the IL could extract more than 90% of Ru(III), Rh(III), and Pd(II) from the simulated HLLW within 2 h at 50 °C.

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