IV. CONCLUSION
The removal of Cu(II) from water by using chicken eggshells
has been experimented under several conditions such as at
different pH, agitation rate and contact time. The optimum pH
for copper adsorption was found at pH 7, whereas the optimum
agitation rate was determined at 350 rpm. From the analysis of
adsorption equilibrium, the correlation regression coefficients
showed that the adsorption process was better defined by
Freundlich equation. Results also indicated that adsorption
kinetics of Cu(II) adsorption on chicken eggshells followed the
pseudo-second-order kinetic model where the chemisorption
process may be the rate-limiting step in the adsorption
process. This study shows that chicken eggshells have high
potential to be used as low-cost adsorbent for the removal of
copper from water.