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Abstract
The effect on polyurethane foam (PUF) of washing with different concentrations of HCl (1, 3, 6, or 11.8 M) has been studied. After washing, PUF was characterized by use of different techniques. The adsorption properties of PUF and its chromatographic behavior in the separation and preconcentration of gold from thiocyanate solution were investigated by batch and dynamic processes. Uptake of Au(III) was maximum after washing with 0.05–0.2 M HCl. The kinetics of adsorption of the Au(III) were found to be rapid; the average half-live of adsorption (t 1/2) was 60 s. Average values of the thermodynamic quantities ΔH and ΔG were −40.7 and −5.9 kJ mol−1, respectively. These data indicate that adsorption of Au(III) by white PUF proceeds via both weak anion exchange and an ion-association mechanism. PUF was verified as a good adsorbent by determination of Au(III) in spring water and in gold alloy samples.
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