As given by Eqs. (6) and (8), the lactones and basic functional groups
such as amines are positively charged at pH 5.4–5.8. At pH 10.5, typical
industrial condition in gold cyanidation, only a fraction of the basic
groups may remain positively charged. Therefore, such groups represent
possible adsorption sites of the activated carbon samples for the
negatively charged cyanocomplexes. The selected resin has quaternary
amines (R4N+) as the characteristic functional groups,which are groups
positively charged regardless of the pH value.
The loading breakthrough curves for pH 5.4–5.8 and 10.5 are shown
in Fig. 9. It can be seen similar copper loadings as a function of BV at both
pH values. Under the investigated conditions (i.e., low Cu(I) concentration
and ionic strength), the maximum loading (~1.4 mmol•g−1) was
attained at BV about 130. Thus, at pH 5.4–5.8 and 10.5, the interaction
As given by Eqs. (6) and (8), the lactones and basic functional groups
such as amines are positively charged at pH 5.4–5.8. At pH 10.5, typical
industrial condition in gold cyanidation, only a fraction of the basic
groups may remain positively charged. Therefore, such groups represent
possible adsorption sites of the activated carbon samples for the
negatively charged cyanocomplexes. The selected resin has quaternary
amines (R4N+) as the characteristic functional groups,which are groups
positively charged regardless of the pH value.
The loading breakthrough curves for pH 5.4–5.8 and 10.5 are shown
in Fig. 9. It can be seen similar copper loadings as a function of BV at both
pH values. Under the investigated conditions (i.e., low Cu(I) concentration
and ionic strength), the maximum loading (~1.4 mmol•g−1) was
attained at BV about 130. Thus, at pH 5.4–5.8 and 10.5, the interaction
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