Abstract
Chemically surface modified core–shell magnetic manganese dioxide nanocomposites were prepared by redox reaction of KMnO4 to MnO2 on the surface of hydrophilic carbon coated magnetite (Fe3O4/C) microspheres in alkaline media, coupling with the modification by citric acid (CA). Properties of the synthesized adsorbent were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and vibration sample magnetometer (VSM) analysis and Brunauer–Emmett–Teller (BET) technique. Characterization results showed that prepared material had well-defined core–shell structure composed of inner magnetite core with superparamagnetic property and outer shell of nano-manganese dioxides modified with citric acid. The adsorption kinetics and isotherm were studied to examine the adsorption efficiency of citric acid modified magnetic manganese dioxide (Fe3O4/C/MnO2-CA) nanocomposites towards methylene blue (MB) as basic dye. The kinetic data were found to fit pseudo-second-order model as compared to pseudo-first-order model. Langmuir isotherm model fitted the experimental data better than the Freundlich isotherm model. The adsorption mechanism study suggested that the hydrogen bonding, electrostatic and electron acceptor-donor interactions were responsible for the adsorption of MB on Fe3O4/C/MnO2-CA nanocomposites.
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