Abstract
In this study, an alumina modified onion skin (AMOS) composite was synthesized, characterized, and used as an adsorbent to remove Pb2+ and Cd2+ from aqueous solutions via adsorption process. The central composite design was used for the optimization of metal ions adsorption on AMOS. The experimental data were analyzed using equilibrium isotherm and kinetic models. Predicted values of removal efficiency were found to be in good agreement with the observed values obtained (R2 = 0.9612 for Pb2+ and R2 = 0.8616 for Cd2+). The results obtained showed that at the optimum conditions of 200 mg/L initial metal ions concentration, 1.20 g/L adsorbent dosage, and 75.59 min contact time, the maximum removal percentages of 92.05% and 94.89% for Pb2+ and Cd2+, respectively, were achieved. Langmuir isotherm gave the best fit with values of monolayer uptake capacities as 9.74 mg/g and 14.17 mg/g for Pb2+ and Cd2+, respectively, and pseudo-second-order kinetic model gave the best fit with the adsorption data.
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