▎ 摘　　要

NOVELTY - Composite material comprises functionalized graphene and superparamagnetic iron oxide particles, which are loaded on functionalized graphene surface. Size of superparamagnetic iron oxide particles is less than 30 nm, where functionalized graphene is selected from functionalized graphene polyacrylamide, polyacrylic acid functionalized graphene, polyethyleneimine functionalized graphene or graphene functionalization by Tween (RTM: Polysorbate) 20. USE - Composite material. ADVANTAGE - The composite material has superparamagnetic properties. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing composite material, which involves: (A) mixing functionalized graphene containing ethylene glycol with diethylene glycol in reaction apparatus with continuous stirring to obtain mixture; (B) adding iron(III) chloride hexahydrate, anhydrous sodium acetate and obtained mixture with continuous stirring to obtain clear solution, where mass ratio of iron(III) chloride hexahydrate, anhydrous sodium acetate and functionalized graphene is 1:3:0.1-0.5; and (C) heating clear solution at 195-210 degrees C for 8-12 hours to obtain desired product.