▎ 摘　　要

NOVELTY - Preparation of graphene composite material, involves (i) ultrasonically dispersing graphite oxide in ultrapure water, (ii) preparing ammonium heptamolybdate aqueous solution, ultrasonically dispersing titanium dioxide powder into ammonium heptamolybdate aqueous solution, hydrothermally reacting, evaporating, concentrating to obtain titanium dioxide-molybdenum trioxide core-shell structural nanoparticle colloidal solution, (iii) mixing dispersion of graphene oxide with titanium dioxide-molybdenum trioxide core-shell structural nanoparticle colloidal solution and adjusting pH to 6-8. USE - Preparation of graphene composite material. DETAILED DESCRIPTION - Preparation of graphene composite material, involves (i) ultrasonically dispersing graphite oxide in ultrapure water to obtain a dispersion of graphene oxide, (ii) taking certain amount of ammonium heptamolybdate tetrahydrate, dissolving in ultrapure water, configuring into ammonium heptamolybdate aqueous solution, taking certain amount of titanium dioxide powder, ultrasonically dispersing into ammonium heptamolybdate aqueous solution according to molar ratio of molybdenum trioxide and titanium dioxide is 16:1, then transferring the reaction system to an open round bottom flask, hydrothermally reacting at 70-90 degrees C, then slowly evaporating and concentrating at room temperature, and finally obtaining titanium dioxide-molybdenum trioxide core-shell structural nanoparticle colloidal solution, (iii) mixing dispersion of graphene oxide with titanium dioxide-molybdenum trioxide core-shell structural nanoparticle colloidal solution evenly, adjusting pH to 6-8, ultrasonically dispersing to obtain dispersion of graphene oxide composite material, (iv) adding reducing agent to the dispersion of graphene oxide composite material, reacting for 2-4 hours so that the graphene oxide is reduced to graphene, and obtaining graphene composite dispersion, (v) centrifuging supernatant liquid of dispersion obtained in step (iv) at low speed, and then centrifuging the supernatant at high speed to obtain graphene composite precipitate, (vi) cooling the precipitate, then carrying out filtration with nylon filter membrane having a pore size of 1.2 mu m, washing with deionized water, and washing with ethanol, drying the resulting product in a vacuum oven and obtaining graphene composite material.