Title : Removal of copper from aqueous solution by almond peel as a low cost sorbent material: kinetic, equilibrium and modelling
The removal of copper ions (Cu2+) by an agricultural waste (almond peel) from synthetic aqueous solutions has been studied in batch mode. The effect of contact time and initial concentration of metal on the sorption kinetic has been studied. The results found showed that the quantity of metal removed by almond peel at equilibrium increases with the increase of these parameters. The kinetic of copper sorption onto the material is goodly described by the pseudo-second-order kinetic model (R2 = 0.9999). Models of Langmuir and Freundlich have been used to describe the results of equilibrium sorption at the natural pH of solutions. The model of Langmuir found to be adequate for a good description of the results (0.9968) compared with the model of Freundlich (0.9233). The maximal capacity (qmax) of copper sorption by these waste found as 78.25 mg/g (or 1.23 mmol/l) under these applied conditions.