Activated carbons prepared from chestnut shell and grapeseedwere used as adsorbent for the removal of
Cu (II) ions from aqueous solutions. Adsorption experiments were performed by varying initial metal ion
concentration, temperature and pH. Freundlich and Langmuir isotherms were used to analyze the equilibrium
data obtained at different adsorption conditions. It was observed that Freundlich isotherm provided
better fit to the equilibrium data than Langmuir isotherm. Effects of temperature, pH and adsorbent
surface area on the adsorption capacity constant of Freundlich and Langmuir isotherms were statistically
investigated by using a two-level factorial design technique and empirical regression equations
were developed. It was determined that the adsorption capacities of adsorbents increased with increasing
temperature, pH and surface area. The SEM images of adsorbents before and after adsorption were
compared