Abstract: Using exfoliatable graphite, Fe(NO₃)₃, Co(NO₃)₂ and citric acid as raw materials, magnetic exfoliated graphite (MEG) was prepared by citrate sol-gel process. The microcosmic performance and magnetic property of MEG were characterized by SEM, EDS, XRD and hysteresis loop. In addition, the effects of raw material ratio, pH value of exfoliatable graphite and expanded time on magnetic property and adsorption oil capacity of MEG were studied. Based on the factors of magnetic intensive, adsorption oil capacity and costs of preparation and so on, the optimum preparation conditions of MEG are found as follows, the ratio of exfoliatable graphite to ferrite is 2:1, the pH value of exfoliatable graphite is 5 and the expanded time is 120s at 900℃. The experimental results show that ferrite can be effectively deposited which is homogeneous distribution on/between exfoliatable graphite in the optimum preparation condition, and the prepared MEG has high magnetic intensive and adsorption oil capacity. The saturation magnetization and adsorption oil capacity of
MEG are 17.95A·m²·kg^-1 and 32.6g·g^-1, respectively.

Key words: citrate sol-gel process, magnetism intensive, exfoliated graphite