Research on synthesis and effects of solution concentration of Magnetic Exfoliated Graphite Material - EG@CoFe2O4 on Congo Red Dye Adsorption

Abstract

   In this study, the magnetic Exfoliated Graphite Material EG@CoFe₂O₄ was successfully synthesized through sol-gel method. The characterization of EG@CoFe₂O₄ was assesed by X-ray diffaction analysis (XRD), Scanning electron microscope (SEM), Fourier- transform infrared spectroscopy (FT-IR) and N₂ adsorption/desorption isothermal measurement (BET). The results show that EG@CoFe₂O₄ was formed with high crystalization, which is quite homogenerous. In addition, CR adsorption of EG@CoFe₂O₄ is higher than CoFe₂O₄ without EG decoration. In particular, the quantity method by Boehm titration was used to identify the contents of functional groups: Carboxylic acid (0.044mmol/g), phenol (0.032mmol/g), lactone (0.020mmol/g) and total base (0.0156mmol/g) on the surface of EG@CoFe₂O₄. Adsorption capacity is the highest at the concentration of 60mg/l with the adsorption equilibrium time of 120 minutes, achieving 98.60mg/g.