The Recovery Of Pd(II), Ir(III) And Rh(III) From Aqueous Solutions With Yeast-functionalised Zeolite
Mosai, Alseno; Chimuka, Luke; Cukrowska, Ewa; Kotze, Izak; Tutu, Hlanganani
Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag X3, WITS, 2050, South Africa,
Wastewaters from platinum group metals (PGMs) processing plants can contain significant amounts of metals including the very PGMs. The recovery of such metals from wastewaters can be of great value especially due to recent declines in commodity prices. The recovery of Pd(II), Ir(III) and Rh(III) by zeolite functionalised with spent yeast waste was studied and the effect of adsorbent dosage, pH, initial concentration, contact time and competing ions was determined. The significant recovery of Pd(II) and Ir(III) was achieved at pH 2, 2 mg L-1 and 10 g L-1 adsorbent dosage. The adsorption capacity of Rh(III) increased with pH whilst that of Pd(II) and Ir(III) decreased. The presence of competing ions led to an increase in adsorption capacity due to an adsorbent-Fe-analyte synergistic effect. The adsorbent is suitable for significant recovery of Pd(II), Ir(III) and Rh(III) from PGMs wastewater.