___

• [this work] [27] [28] [29] [30]
• Figure 4. (A) TEM image of the GO–Fe3O4hybrid composite after adsorption of MB, (B) the reusability of the GO–Fe3O4composite in the MB removal from aqueous solution for 5 successive runs. ([GO–Fe3O4] = 0.6 g/L and [MB] = 13 mg/L).
• Experimental section 3.1. Materials
• Iron(III) acetylacetonate (Fe(acac)3,≥99.9%), oleylamine (OAm, >70%), benzyl ether (BE, 98%) potassium permanganate (KMnO4,
• ≥9%), potassium peroxodisulfate (K2S2O8,≥99.9%), phosphorous pentaoxide (P2O5,≥98%), hydrogen peroxide (H
• , 30%), sodium nitrate (NaNO3,≥99.9%), sulfuric acid (H2SO, 98%), N,N-dimethylformamide (DMF, 99.8%), and methylene blue (MB) were purchased from Sigma-Aldrich. Natural graphite flakes (average particle size 325 mesh) were purchased from Alfa Aesar. All chemicals were used without any further purification. Deionized water was distilled by water purification system (Milli-Q System).
• Characterization
• Synthesis of GO–Fe3O4nanocomposite
• The dye adsorption experiments were carried out in round bottom flasks at room temperature. In a typical experiment, 25 mL of aqueous solution of MB with a known initial concentration was mixed with 25 mg of the GO–Fe3O4nanocomposite well-dispersed in water via sonication. The resultant mixture was shaken for 24 h at pH
• ∼ Next, the GO–Fe3O4
• (1) where qe is the concentration of dye adsorbed (mg/g), Coand Ceare the initial and equilibrium concentrations of dye (mg/L), m is the mass of the GO–FeO4(g), and V is the volume of solution (L).11,17The adsorption experiment was also performed at different pH values by adjusting pH via use of HCl and NaOH. References