Since the metals uptake by chicken eggshells is highly
dependant on the number of active binding sites or functional
groups on the adsorbents, further research can be attempted to
enhance the existing results by modifying the chicken eggshell
adsorbents using acids or bases. As a result of chemical
modification, it is expected that the number of active binding
sites or functional groups on the adsorbents might be
increased to improve the adsorption capacity of adsorbents.