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Countercurrent chromatography approach to palladium and platinum separation using aqueous biphasic system
Olga Mokhodoeva1, Irina Rudik1, Valery Shkinev1
1Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 19 Kosygin street, Moscow 119991, Russia.
Journal of Chromatography. A
|October 10, 2021
Summary
A novel polymer-salt extraction system effectively separates palladium (Pd) and platinum (Pt) from industrial solutions. This method achieves high purity (≥99.9%) without special reagents, using recyclable and non-toxic components.
Area of Science:
- Chemical Engineering
- Separation Science
- Materials Science
Background:
- Selective separation of precious metals like palladium (Pd) and platinum (Pt) is crucial for recycling and purification.
- Traditional methods often involve harsh chemicals or complex multistep processes.
Purpose of the Study:
- To develop a novel, efficient, and environmentally friendly method for separating Pd(II) and Pt(IV) from chloride technological solutions.
- To investigate the application of an aqueous biphasic polymer-salt extraction system using countercurrent chromatography.
Main Methods:
- Utilized an aqueous biphasic polymer-salt extraction system with poly(ethylene glycol)-1500 (PEG-1500) as the stationary phase.
- Employed countercurrent chromatography in a rotating coiled column for multistage separation.
- Adjusted salt concentration and pH of the salt-rich phase for metal stripping.
Main Results:
- Achieved 96-100% recovery of Pd(II) and Pt(IV) from solutions containing copper and nickel.
- Obtained final metal fractions with purity ≥99.9%.
- Demonstrated the recyclability, non-toxicity, and availability of system components.
Conclusions:
- The proposed polymer-salt extraction system offers a selective, efficient, and scalable method for platinum metal separation.
- The use of a rotating coiled column facilitates a multistage extraction process with high purity recovery.
- This approach presents a greener alternative for precious metal recovery from industrial waste streams.
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