In this study, activated carbon was prepared from pumpkin seed shells by ZnCl2 (chemical) activation at an impregnation ratio of 3/1 and a carbonization temperature of 500 oC. The prepared activated carbon was used to remove lead(II) ions from aqueous solutions. The BET surface area and micropore volume of the obtained activated carbon was 1564 m2/g and 0.526 cm3/g, respectively. Optimum adsorption conditions were determined as a function of initial pH, contact time, temperature, adsorbent dosage and initial lead(II) concentration. Langmuir isotherm provided the best fit to the equilibrium data with maximum adsorption capacity of 36.33 mg/g. The kinetic data were found to follow closely the pseudo-second-order model. The thermodynamic parameters such as AGo, AHo and ASo were calculated for predicting the nature of adsorption.
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