Abstract: Using expanded graphite (EG) as carrier,the magnetic Fe3 O4/expanded graphite (MEG) was prepared by hydrothermal method.The structures and morphologies of the MEG were characterized by Xray diffraction (XRD) and Scanning electron microscope (SEM).Methylene Blue was used as a probe pollutant to investigate the effects of pH value,adsorption time,salt ionic strength and initial concentration on adsorption property,corresponding adsorption kinetics and adsorption isotherm were researched.The results indicate that the adsorption rate and adsorption capacity of 50 mg · L-1 methylene blue can reache 97.03; and 48.52 mg · g-1 in the condition of pH 7,absorption time 60 min;The adsorption capacity reduces with the Na + and Ca2+ increase;the adsorption behavior is mainly in accordance with the pseudo-second-order kinetics model and Langmuir model.The recovery rate can reach 97.51; by magnet.The adsorption amount for Methylene Blue is also 41.72 mg · g-1 after five adsorption-regeneration cycles,which show that MEG has stable reuse ability.

Key words: Using expanded graphite (EG) as carrier,the magnetic Fe3 O4/expanded graphite (MEG) was prepared by hydrothermal method.The structures and morphologies of the MEG were characterized by Xray diffraction (XRD) and Scanning electron microscope (SEM).Methylene Blue was used as a probe pollutant to investigate the effects of pH value,adsorption time,salt ionic strength and initial concentration on adsorption property,corresponding adsorption kinetics and adsorption isotherm were researched.The results indicate that the adsorption rate and adsorption capacity of 50 mg · L-1 methylene blue can reache 97.03; and 48.52 mg · g-1 in the condition of pH 7,absorption time 60 min;The adsorption capacity reduces with the Na + and Ca2+ increase;the adsorption behavior is mainly in accordance with the pseudo-second-order kinetics model and Langmuir model.The recovery rate can reach 97.51; by magnet.The adsorption amount for Methylene Blue is also 41.72 mg · g-1 after five adsorption-regeneration cycles,which show that MEG has stable reuse ability.