A Study on the Adsorption of Gold(III) with Macroporous Crosslinked Polyacrylate (MET) Resins. I. Adsorption Equilibrium

Abstract

Equilibrium data for the adsorption of gold tetrachloride from aqueous solutions of four different concentrations of hydrochloric acid (0.250,0.500,0.750, and 1.00 mol.dm-HC1) by macroporous crosslinked polyacrylate (MET) resins which have the same functional groups and different structural characteristics have been obtained at a temperature of 25 2 0.5"C. It was found that the mechanism of adsorption can be regarded as simple ion exchange, and that the adsorption of gold in the resin phase is a "homogeneous" adsorption. The equilibrium constants and the capacities for the adsorption of gold by MET resins were estimated, and the influence of the acidity of the solutions on the equilibrium parameters were discussed.