RARE METALS: Adsorption of platinum(IV) onto D301R resin

Pt(IV) was quantitatively adsorbed by D301R resin in the medium of pH = 3.47. The statically saturated adsorption capacity is 410 mg/g. Pt(IV) adsorbed on D301R resin can be eluted by 1.0-2.0 mol/L NaOH. The rate constant is k298 = 5.43 X 10-5S-1. The adsorption of Pt(IV) on D301R resin obeys the Freundlich isotherm. The adsorption parameters of thermodynamics are as follows: enthalpy change DeltaH = 4.37 kJ/mol, Gibbs free energy change DeltaG = -5.39 kJ/mol, and entropy change DeltaS = 32.76 J/(mol*K). The apparent activation energy is Ea = 22.5 kJ/mol. The coordination molar ratio of the functional group of D301R resin to Pt(IV) is 2:1.