▎ 摘　　要

NOVELTY - A magnetic nanocomposite comprises nano ceria and magnetic ferroferric oxide nanoparticles loaded on graphene. USE - Magnetic nanocomposite is used as catalyst for nitrogen-oxide treatment (claimed). ADVANTAGE - The magnetic nanocomposite has high catalyst recovery rate, can be recycled several times, removes nitrogen oxides to an amount of 100 mg/m3 or less, and satisfies pollutant discharge standards of GB3095-2012. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of magnetic nanocomposite, which involves loading nano ceria on graphene, and loading magnetic ferroferric oxide nanoparticles on nano-ceria-modified graphene.