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Biomasa de maíz funcionalizada con quitosano para la adsorción de hierro: Un enfoque verde multidimensional
Mohamed R El-Aassar1, Hassan M A Hassan1, Ebtsam K Alenezy1
1Chemistry Department, College of Science, Jouf University, P.O. Box 2014, Sakaka, Saudi Arabia.
Abstract:
This study reports the fabrication of Zeamays-chitosan@anthracite (MZ-CS@An), an eco-friendly biohybrid adsorbent derived from chitosan, anthracite, and activated Zea mays for the targeted removal of Fe(II) from aqueous solutions. Comprehensive physicochemical characterization, including XRD, FTIR, BET, TG/DTG, FESEM, EDX, and Raman analyses, confirmed the material's robust structural features and high surface functionality. Adsorption performance was systematically optimized using a Box-Behnken Design (BBD), which highlighted the influence of initial Fe(II) concentration, adsorbent dosage, and contact time on removal efficiency. Kinetic analysis indicated that the pseudo-second-order model best described Fe(II) sequestration, while equilibrium data were most consistent with the Jossens isotherm. The Dubinin Radushkevich model suggested a physisorption-dominated mechanism, further supported by the calculated mean free energy (0.81 kJ/mol). Thermodynamic parameters demonstrated that adsorption was spontaneous and endothermic. Cost analysis revealed a low estimated production cost of $0.09 per kilogram per cycle, with only 84.87 g of MZ-CS@An required to treat 100 L of Fe(II) contaminated water. Importantly, the composite maintained high removal efficiency over five regeneration cycles, underscoring its potential for sustainable and cost-effective water purification applications.
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