Journal
CHEMISTRYSELECT
Volume 2, Issue 3, Pages 1052-1057Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/slct.201601981
Keywords
Automotive catalysts; Calix[n]arene; Platinum group metals; Separation; Solvent extraction
Categories
Funding
- Takahashi Industrial and Economic Research Foundation, Japan [325]
- Program to Disseminate Tenure Tracking System, MEXT, Japan
- Tohoku Innovative Materials Technology Initiative for Reconstruction High Efficiency Rare Elements Extraction Technology Area, MEXT, Japan
- Postdoctoral Fellowship for Overseas researcher of the Japan Society for the Promotion of Science
- Grants-in-Aid for Scientific Research [16F16353] Funding Source: KAKEN
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To clarify efficiency recovery for platinum group metals (PGMs) from leach liquors of automotive catalysts, synthesis of three p-dialkylaminomethylcalix[4] arenes (propyl=1; butyl=2; and amyl=3), as extractants and their PGM extractabilities toward Pt, Pd, and Rh, from single-component PGM solutions, simulated mixed PGM solutions, and leach liquors of automotive catalysts were investigated. Various experimental conditions, such as the effect of shaking time, HCl concentration, concentration of extractants, and concentrations of Pd(II) and Pt(IV), were studied. The distribution ratio and stoichiometry ratio of Pd(II) and Pt(IV) extracted species were calculated. Extractants 2 and 3 showed a higher extractability compared to 1 toward Pd(II) and Pt(IV) ions from the leach liquors of automotive catalysts: E%=91.5% and 87.5% for 2, and 88.3% and 88.1% for 3, respectively. In contrast, the extractability of all the other metal ions (Al, Ba, Ce, La, Rh, Y, and Zr) by 2 and 3 was E%=<6%. Stripping of Pd(II) and Pt(IV) from organic solutions was achieved using a thiourea/HCl solution. Reusability of extractants 2 and 3 is also discussed.
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