Highly efficient hexavalent chromium removal using nano-Fe3O4/pomegranate peel biochar/Alginate composite as an advanced biosorbent

Authors : Şerife Parlayıcı, Erol Pehlivan

Pages : 22-32

Doi:10.51435/turkjac.1595052

View : 28 | Download : 25

Publication Date : 2025-01-31

Article Type : Research Paper

Abstract :In this study, a novel composite – nano-Fe₃O₄/pomegranate peel biochar/alginate hydrogel beads (nFe₃O₄-PPBC/Alg) – was synthesized as an alternative adsorbent for removing Cr(VI) ions from aqueous solutions. The adsorbent material was characterized using FT-IR analysis and scanning electron microscopy (SEM). Cr (VI) removal efficiencies were calculated using the standard batch adsorption method to determine the optimal pH, adsorbent dose, contact time, and initial concentration. Various adsorption isotherms, such as Freundlich, Langmuir, and Dubinin–Radushkevich, were employed to describe the adsorption behavior at equilibrium. The Langmuir adsorption isotherm was found to be the most suitable for describing the observed adsorption phenomena, with the adsorption capacity of nFe₃O₄-PPBC/Alg determined to be 303.03 mg/g for Cr (VI). To investigate the adsorption processes on the nFe₃O₄-PPBC/Alg, kinetic models, including pseudo-first-order and pseudo-second-order models, were applied. The pseudo-second-order kinetic model provided the best fit to the experimental data. This study demonstrated that nFe₃O₄-PPBC/Alg is an effective adsorbent for the removal of Cr (VI) from aqueous solutions.
Keywords : Alginat, Biyokömür, Cr(VI), nano-Fe3O4, Kinetik, Nar Kabuğu