▎ 摘　　要

NOVELTY - A magnetic ferroferric oxide nanoparticle-graphene composite material comprises ferroferric oxide nanoparticles with particle size of 10-35 nm supported on a graphene sheet material. The composite material has specific surface area of 60-65 m2/g and contains graphene stacked to a gap size of 20-100 nm. USE - Magnetic ferroferric oxide nanoparticle-graphene composite material used for rapid sewage treatment to remove contaminants such as heavy metal chromium ions and/or toxic cadmium sulfide nanoparticles and suspended solids in river water, and for counter electrode of dye-sensitized solar cell by adsorption of hexavalent chromium ions (all claimed). ADVANTAGE - The composite material effectively removes chromium ions in the wastewater, suppresses the generation of sludge, prevents generation of secondary pollution, and provides electrode with strong absorption. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the composite material.