▎ 摘　　要

NOVELTY - Titanium dioxide powder is added to graphene oxide solution, stirred, sodium hydroxide solution is then added and stirred, to obtain mixed solution. The mixed solution is reacted in hydrothermal reactor, an acid solution is then added, mixed, centrifuged, washed using deionized water until the supernatant is neutral, filtered and dried at 60-120 degrees C for 12-24 hours, to obtain precursor. The precursor is heat-processed at 300-500 degrees C for 2-6 hours under protective atmosphere, to obtain titanium dioxide-graphene nanocomposite material. USE - Preparation of titanium dioxide-graphene nanocomposite material used for photocatalyst, air purification, dye-sensitized solar battery, and anode material for lithium-ion battery. ADVANTAGE - The method enables economical preparation of titanium dioxide-graphene nanocomposite material with excellent structural stability and conductivity by simple process. The nanocomposite material can withstand high charge and discharge current density characteristics. DETAILED DESCRIPTION - Titanium dioxide powder is added to graphene oxide solution, stirred for 2-6 hours, sodium hydroxide solution is then added and stirred for 10-60 minutes, to obtain titanium dioxide-graphene oxide-sodium hydroxide mixed solution. The mixed solution is reacted at 120-180 degrees C for 96 hours in hydrothermal reactor. An acid solution is then added to obtain thick substance, mixed for 12-24 hours, centrifuged, washed using deionized water until the supernatant is neutral, filtered and the obtained residue is dried at 60-120 degrees C for 12-24 hours to obtain precursor. The precursor is heat-processed at 300-500 degrees C for 2-6 hours under protective atmosphere, to obtain titanium dioxide-graphene nanocomposite material. The volume ratio of titanium dioxide powder, graphene oxide solution and sodium hydroxide solution is 1 g:10-50 mL:80-400 mL. The volume ratio of thick substance and acid solution is 1:10-200.