Metallurgical recovery of metals from electronic waste: a review.

Cyanide in industrial wastewaters and its removal: A review on biotreatment

Evidence for the protonation of basal plane sites on carbon

Hydrometallurgy of precious metals recovery

Removal of cyanide from water and wastewater using granular activated carbon

The mechanism of adsorption of aurocyanide onto activated carbon and its subsequent elution are examined in this study, with special reference to the effects of acid and alkali treatment on the system. The results, including a careful analysis of the distribution of all ions in the ad-sorption and elution processes, are discussed, and evidence for the adsorption and elution mech-anisms involved is presented. It is proposed that, under normal plant conditions, aurocyanide is extracted onto activated carbon in the form of an ion pair, Mn+[Au(CN)2]n], and eluted by hydroxide or cyanide. The hydroxide or cyanide ions react with the carbon surface, rendering it relatively hydrophilic with a decreased affinity for neutral species. Additional adsorption mechanisms are shown to operate under other conditions of ionic strength, pH, and temperature, and it is suggested that this may account in part for the lack of agreement among workers.

/pdf/the-mechanism-of-adsorption-of-aurocyanide-onto-activated-2qij9w2s59.pdf

M. D. Adams

Papers

The mechanism of adsorption of aurocyanide onto activated carbon