Gold Removal and Recovery using Mesoporous Silica Adsorbents
نویسندگان
چکیده
Two gold-selective adsorbents were prepared from MCM-41 by grafting amino and thiol groups. The mesoporous silica adsorbents possess higher adsorption capacity for gold compared to activated carbons. The OMSNH2 adsorbent was able to selectively remove and adsorb gold from solutions containing copper. Pure gold was recovered by a simple acid wash and the regenerated adsorbents could be reused. The OMS-SH also selectively adsorb gold, but always with a small quantity of copper (ca 1-5 at. %). In addition, the metals were irreversibly adsorbed on OMS-SH and can not be easily recovered.
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