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Updated: Sep 30, 2025

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants
Published on: October 19, 2017
Extraction behavior of a novel functionalized ionic liquid for separation of platinum group metals from aqueous
Tatsuya Ito1, Haruka Oosugi2, Naoki Osawa2
1Japan Atomic Energy Agency, 2-4, Shirakata, Tokai-mura, Naka, Ibaraki, 319-1195, Japan. ito.tatsuya@jaea.go.jp.
Abstract:
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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