The removal of Copper (Cu2+) from aqueous
solution by adsorption on pomelo peel (PP) and depectinated
pomelo peel (DPP) were studied. Factors affected to adsorption;
initial pH, initial concentration, contact time and temperature
were investigated. It was found that the highest Cu2+ adsorption
capacity for PP and DPP were 19.7 mg/g and 21.1 mg/g at the
following conditions; pH = 4 , 125 mg/l of initial concentration ,
temperature of 25 0C and equilibrium time about 60 min.
Adsorption isotherm of both PP and DPP were well described
by the Langmuir model. The kinetic studies showed that a
pseudo-second-order rate model was adopted to described the
Cu2+ adsorption. The thermodynamics parameter of the Cu2+
adsorption were evaluated at temperature of 25, 35 and 45 0C.
The negative of standard free energy change and enthalpy
change revealed that the adsorption process is spontaneous and
exothermic.