p-Sulfonatothiacalix[6]arene-impregnated resins for the sorption of platinum group metals and effective separation of palladium from automotive catalyst residue

• p-Sulfonatothiacalix[6]arene was impregnated onto commercial polymeric resins.
• The sorption of Pd(II) on all impregnated resins followed the Freundlich isotherm.
• 1XAD-7 selectively adsorbs only Pd(II) from automotive catalyst leached solution.
• 1XAD-7 can be used as effective adsorbent for Pd(II) from secondary resources.

p-Sulfonatothiacalix[6]arene was impregnated onto commercial polymeric resins. The platinum group metals sorption experiments were carried and maximum PGM sorption was observed at pH 4 in 180 min. The 1-loaded IRA-400, IRA-411, and XAD-7 showed Pd SCs of 279, 265, and 135 mg/g, respectively. The PGM SCs of 1-loaded IRA-400, IRA-411 are found to be Pd > Pt > Rh. All the impregnated resins followed Freundlich isotherm and Pd sorption was exothermic. The kinetic studies demonstrate that Pd sorption follows pseudo-second order and intraparticle diffusion models. 1-Loaded XAD-7 selectively adsorbs of Pd ions from an automotive catalyst residue leached solution.

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