Abstract
Pectin/chitosan magnetic sponge was fabricated using inotropic gelation method and evaluated for the removal of methylene blue dye from aqueous samples. The influence of different factors including pH, methylene blue initial concentration and amount of adsorbent on MB adsorption was assessed using Box–Behnken design. Quadratic model was selected as fitting mathematical model to the studied response. The pH and methylene blue initial concentration positively affected the capacity of adsorption. Alternatively, adsorbent amount showed a negative effect on the adsorption process. For better comprehension for the mechanisms of adsorption process, adsorption isotherms were calculated by fitting Freundlich, Sips and Langmuir models, on the experimental data. It was indicated that Sips isotherm was the most adequate model to explain methylene blue adsorption on pectin/chitosan magnetic sponge with correlation coefficient of 0.9937 and the lowest Chi-square among the tested isotherms. The maximum capacity of adsorption, calculated using Sips equation, had a high value of 174 mg methylene blue per g adsorbent. In addition, the pseudo-second-order equation well described the kinetics of adsorption. Finally, pectin/chitosan magnetic sponge introduced very good potential in the management of methylene blue wastewater.
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