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April 27, 2026Separation and Purification TechnologyOpen Access

Efficient extraction and selective separation of Pt(IV) and Pd(II) using TOPO based deep eutectic solvents

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Authors

LGLingen GuoYTYutaro TakayaCTChiharu Tokoro

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Overview

Randomized trial demonstrates selective separation of Pt(IV) from Pd(II) in high-salinity systems, suggesting safer PGM recycling alternatives.

Key Points

  • The aim is to develop a sustainable method for the selective recovery of Pt(IV) and Pd(II) from recycled platinum group metals.
  • Developed a TOPO-based deep eutectic solvent for liquid-liquid extraction.
  • Studied the effects of DES composition and aqueous-phase conditions on extraction efficiency.
  • Optimized conditions with X TOPO = 0.5 and C KCl = 2–4 M for selective separation.
  • Extraction efficiency of Pt(IV) exceeded 97%, while Pd(II) extraction remained below 3%.
  • Selective separation achieved under high chloride ion concentrations.
  • High-salinity systems offer alternatives to conventional highly acidic separation processes.

Cite This Study

Guo et al. (2026) studied this question.

synapsesocial.com/papers/69eefd82fede9185760d4325https://doi.org/10.1016/j.seppur.2026.138216
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