Abstract
Abstract The magnetic Fe3O4/activated carbon nanocomposites with high surface area were synthetized as recoverable adsorbents by chemical binding of Fe3O4 nanoparticles on activated carbon (AC) powders. The component AC and Fe3O4 in this nanocomposite possesses amorphous non-graphitic structure and cubic crystal structure, respectively. All composite samples presented superparamagnetic properties. The saturation magnetization of Fe3O4/AC nanocomposites was significantly lower than that of bare Fe3O4 particles, indicating that Fe3O4 particles were truly attached on AC surface. The microstructure image indicated that the Fe3O4 particles were uniformly dispersed on AC surface and thus maintained high specific surface area. The adsorption capacity of methyl orange (MO) at 30 °C slightly decreased from 384 mg/g on AC powders to 324 mg/g on Fe3O4/AC nanocomposites, which was reduced by 15% after magnetic fabrication. It was found that MO adsorption on Fe3O4/AC nanocomposites followed the pseudo-second order kinetic model and the isotherms could be described by the Langmuir model. The easy recovery of magnetic adsorbents from aqueous solution demonstrated their application potential to remove toxic pollutants in water and wastewater treatment.
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