(Eq. (8)) may still be available. Therefore, at pH 10.5, the adsorption
of the negatively charged Cu(CN)3
2 − and Cu(CN)4
3 − complexes decreases
as a result of electrostatic repulsion, as demonstrated by the
lower AD values observed (Fig. 7). The adsorption of Cu species under
this condition is likely related to the interaction with the remaining