Abstract
ABSTRACT Cyanidation is one important process in gold mining industries that required proper methods for gold recovery. The present study aims to explore gold cyanide adsorption using chitosan-polyacrylamide graft copolymers synthesized by gamma irradiation. The effects of pH, gold cyanide concentration, and adsorption time were evaluated. The FTIR analysis shows that grafting of polyacrylamide onto chitosan has been obtained. The results indicated that pH value of 7 had the highest adsorption capacity. It was found that the adsorption capacity increases with increasing gold cyanide concentration and adsorption time. The maximum adsorption capacity was 10.18 mg/g at pH 7, gold cyanide concentration 100 ppm, and adsorption time 100 minutes. Adsorption kinetic studies were also carried out and the experimental data were highest fitted to a zero-order with the rate constant, i.e., 0.3327 ppm.min−1. The Freundlich isotherm model was best suitable for this experiment. Recovery studies had been done with cyanide-NaOH and desorption for gold cyanide released from the adsorbent was obtained up to 18.70%. This research represents a promising application of chitosan-polyacrylamide graft copolymers for the gold adsorbent.
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