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Magnetic Fe~0/Fe_3O_4/graphene has been successfully synthesized by a one-step reduction method and investigated in rapid degradation of dyes in this work. The material was characterized by N_2 sorption–desorption, scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FT-IR), vibrating-sample magnetometer(VSM) measurements and X-ray photoelectron spectroscopy(XPS). The results indicated that Fe~0/Fe_3O_4/graphene had a layered structure with Fe crystals highly dispersed in the interlayers of graphene, which could enhance the mass transfer process between Fe~0/Fe_3O_4/graphene and pollutants. Fe~0/Fe_3O_4/graphene exhibited ferromagnetism and could be easily separated and re-dispersed for reuse in water. Typical dyes, such as Methyl Orange, Methylene Blue and Crystal Violet, could be decolorized by Fe~0/Fe_3O_4/graphene rapidly. After 20 min, the decolorization efficiencies of methyl orange, methylene blue and crystal violet were 94.78%, 91.60% and 89.07%, respectively. The reaction mechanism of Fe~0/Fe_3O_4/graphene with dyes mainly included adsorption and enhanced reduction by the composite. Thus, Fe~0/Fe_3O_4/graphene prepared by the one-step reduction method has excellent performance in removal of dyes in water.
Magnetic Fe ~ 0 / Fe_3O_4 / graphene has been synthesized synthesized by a one-step reduction method and investigated in rapid degradation of dyes in this work. The material was characterized by N_2 sorption-desorption, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), vibrating-sample magnetometer (VSM) measurements and X-ray photoelectron spectroscopy (XPS). The results indicated that Fe ~ 0 / Fe_3O_4 / graphene had a layered structure with Fe crystals highly dispersed in the interlayers of graphene , which could enhance the mass transfer process between Fe ~ 0 / Fe_3O_4 / graphene and pollutants. Fe ~ 0 / Fe_3O_4 / graphene exhibited ferromagnetism and could be easily separated and re-dispersed for reuse in water. Typical dyes, such as Methyl Orange, Methylene Blue and Crystal Violet, could be decolorized by Fe ~ 0 / Fe_3O_4 / graphene rapidly. After 20 min, the decolorization efficiencies of methyl orange, methylene blue and crystal violet were 94.78%, 91.60% and 89.07%, respect ively. The reaction mechanism of Fe ~ 0 / Fe_3O_4 / graphene with dyes mainly including adsorption and enhanced reduction by the composite. Thus, Fe ~ 0 / Fe_3O_4 / graphene prepared by the one-step reduction method has excellent performance in removal of dyes in water.