Abstract
The hematite (α-Fe2O3) nanoparticles were well dispersed onto graphene nanosheets (Gr-NS) to form the hematite-decorated graphene nanosheets (α-Fe2O3-Gr-NS). The formed α-Fe2O3-Gr-NS was characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fourier transform-infrared spectroscopy (FTIR). Nano hematite particles were irregular oval with diameters smaller than 20 nanometers when nitrate ferric salts [Fe(NO3)3.9H2O] was precursors. The α-Fe2O3-Gr-NS exhibited the superior adsorption capacity (up to 545.48mg/g at 298K, pH=6) for dye methyl orange (MO). The adsorption isotherm was fit for adsorption models in the sequence as Langmuir>Freundlich>Temkin. The remarkable adsorption performance of MO was attributed to the multiple adsorption interaction mechanisms (hydrogen bonding, π-π interactions, electrostatic interactions, etc.). The spent α-Fe2O3-Gr-NS could be regenerated easily by ethanol, and the adsorption performance was maintained after regeneration. This study were of great significance for environmental applications of α-Fe2O3-Gr-NS as an attractive nano-adsorbent for organic pollutants removal.
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