▎ 摘　　要

NOVELTY - Preparing graphene-titanium dioxide composite photocatalyst comprises oxidizing and hydroxylating the graphene to obtain the product A, performing amino modification and vinyl modification to the product A, obtaining product B, mixing the product B with nitrogen doped titanium dioxide to obtain the graphene-titanium dioxide composite photocatalyst. USE - The method is useful for preparing graphene-titanium dioxide composite photocatalyst, which is useful in air purifying coating (claimed). ADVANTAGE - The graphene-titanium dioxide composite photocatalyst: is good for the separation of electron hole pair, and good for electron transfer effect to improve the photocatalytic efficiency; can effectively capture harmful substance of air; adopts nitrogen-doped modified titanium dioxide, which has large specific surface area, and increases the collision probability of the photocatalyst and air, and has good air purifying effect. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) a graphene-titanium dioxide composite photocatalyst; and (2) a display device, which is coated with air purifying coating.