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Adsorption of Cadmium onto Orange Peels: Isotherms, Kinetics, and Thermodynamics

Mohamed Ahmed Mahmoud and Mohamed Mohamed El- Halwany

Batch adsorption of Cd (II) onto orange peel, a residue of the fruits processing industry, has been studied. Equilibrium isotherms, kinetic data, and thermodynamic parameters have been evaluated. Equilibrium data fit well with Langmuir isotherm model. The kinetic data were found to follow the pseudo-second-order model. The negative ΔHº value indicates the exothermic nature of the adsorption process. Orange peel was shown to be a promising adsorbent for Cd (II) removal from aqueous solutions.