▎ 摘　　要

NOVELTY - Graphene/titanium dioxide composite material, is claimed. The graphene of the composite material enters to the crystal lattice of anatase of titanium dioxide, and occupies the position of oxygen or becomes an interval ion, and expands the light absorption zone to a visible light zone. USE - Used as graphene/titanium dioxide composite material. ADVANTAGE - The composite material has combined properties of graphene and titanium dioxide which improves and provides strong photocatalytic property to the composite material, and exhibits synergistic effect. The method reduces the utilization rate of graphite and ammonium fluorotitanate raw materials; produces loading-type composite material by carrying out liquid deposition method; and has easy separation procedures, and simple operation process. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the composite material, comprising (i) adding graphite powder to concentrated sulfuric acid, adding potassium permanganate while stirring, maintaining the temperature of the system to not more than 30 degrees C, uniformly stirring, and placing the mixture in a water bath having a temperature of 30-50 degrees C, and reacting for 1-4 hours, where the mass ratio of graphite powder and concentrated sulfuric acid is 1.5-3%, and the mass ratio of graphite powder and potassium permanganate is 20-50%; (ii) adding deionized water to the reacted product obtained in the step (i), where the volume ratio of deionized water and concentrated sulfuric acid is 6-13:1, then maintaining the temperature of the system in the process to not greater than 98 degrees C, stirring, then adding hydrogen peroxide solution (30 wt.%), the volume ratio of hydrogen peroxide solution and concentrated sulfuric acid is 30-50%; (iii) allowing the solution obtained in the step (ii) to stand for a night, centrifuging to remove the supernatant, and obtaining the product, then completely centrifuging, and washing the product with hydrochloric acid solution (1 mol/l) until the centrifugate cannot detect sulfate ion, then washing with deionized water until the supernatant is neutralized, and obtaining graphite oxide, and then drying the graphite oxide for 20-30 hours in a vacuum drying oven of 40-60 degrees C; (iv) adding the graphite oxide into absolute ethanol, ultrasonically dispersing, and obtaining a brownish black suspension, then adding sodium borohydride to the suspension, where the mass ratio of graphite oxide and sodium borohydride is 30-60%, stirring, and centrifuging at room temperature, then dissolving the centrifuged product with absolute ethanol, and obtaining absolute ethanol solution of the graphene; (v) spreading quartz sand on a beaker having a thickness of 1-5 cm, and adding absolute ethanol solution of the graphene, then adding a depositing solution, stirring, placing the obtained solution in a water bath after sealing, and maintaining for 30-60 hours at a constant temperature of 20-60 degrees C; and (vi) taking out quartz sand, washing with distilled water, performing suction filtering of the solution obtained in the step (v), calcining, and then placing the suction filtering product and quartz sand to a muffle furnace, and controlling the calcination temperature at 200-600 degrees C, and time at 0.5-3 hours.