▎ 摘　　要

NOVELTY - A nanometer iron oxide-multi-layer graphene composite material preparing method involves taking dimethylformamide and distilled water, mixing, using mixed solvent for calculation, adding expanded graphite and performing ultrasonic oscillation to obtain multi-layer graphene mixed solution. The obtained solution is added with ferrous chloride tetrahydrate and aqueous sodium acetate solution, stirred and poured into hydrothermal reaction vessel, followed by cooling, centrifuging, washing with ethyl alcohol and water, drying by using drying oven and washing to obtain finished product. USE - Method for preparing nanometer iron oxide-multi-layer graphene composite material. ADVANTAGE - The method enables preparing nanometer iron oxide-multi-layer graphene composite material in a simple manner. DETAILED DESCRIPTION - A nanometer iron oxide-multi-layer graphene composite material preparing method involves taking dimethylformamide and distilled water at a ratio of 8:2, mixing, using mixed solvent for calculation, adding expanded graphite and performing ultrasonic oscillation for 2-7 hours to obtain multi-layer graphene mixed solution. The obtained solution is added with ferrous chloride tetrahydrate and aqueous sodium acetate solution, stirred for 3-6 minutes and poured into hydrothermal reaction vessel at 100-130 degrees C, followed by cooling to room temperature for 1-5 hours, centrifuging, washing with ethyl alcohol and water for 3 times, drying at 60 degrees C for 24 hours by using drying oven and washing to obtain finished product.