Dithiodiglycolamide impregnated XAD-16 beads for separation and recovery of palladium from acidic waste

N,N,N',N'-Tetra-(2-ethylhexyl)-dithiodiglycolamide were impregnated onto XAD-16 resin and evaluated for the sorption of palladium from acidic medium. The sorption kinetics for Pd on the resin was fast, equilibrium was attained within 60-90 min. The pseudo-first order kinetics model closely matches with the experimental data of sorption kinetics. The sorbed palladium can be eluted using 0.01 M thiourea in 0.1 M HNO3 solutions. Freundlich sorption isotherm model fit well with the isothermal sorption data with maximum sorption capacity of ≈ 29 mg/g. Sorption studies with simulated HLW solution have shown high uptake of palladium and very small co-extraction of lanthanides.