However, in the present study it was observed that Cr ion
was preferentially adsorbed over other metal species, this
fact may be related to its higher positive charge and ease to
form hydrolyzed species, which has a significant effect on the
adsorption. The trend to undergo hydrolysis has been observed
as the most important factor in adsorption processes involving
several metal ions simultaneously (Lesmana et al., 2009).
The element with the least ability to undergo hydrolysis is
Cd, followed by Pb and Cr. However, the results showed that
Cd was more adsorbed than Pb