Abstract
Experiments were carried out to establish the effectiveness of activated carbon as a gold adsorbent from a bis(thiourea)gold(I) chloride complex aqueous solution. The amount of gold recovered was determined on the basis of the following parameters: amount of carbon in suspension, gold concentration in solution, carbon mesh size, temperature and time of adsorption, stirring rate of the system and pH of the adsorption medium. The gold adsorption on carbon can be maximized when these variables are used at optimal levels. The activated carbon samples treated with bis(thiourea)gold(I) complex solution were analyzed by X-ray fluorescence, optical microscopy, electron microprobe techniques and zeta potential analysis. The evidence at microscopical level provided by these analyses suggests that the gold complex is adsorbed on the activated carbon probably without reduction to metallic gold.
Published Version
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