▎ 摘　　要

NOVELTY - Preparing titanium dioxide composite photocatalyst, comprises taking polydopamine carrier, titanium source and solvent 1 containing solution 1, alkali and solvent 2 containing solution 2, mixing polydopamine carrier with solution 1, then adding solution 2, reacting at first temperature to obtain titanium dioxide, coating the surface of polydopamine carrier with obtained titanium dioxide to obtain first preform, calcining first preform at second temperature to obtain second preform, taking reducing sugar and graphene oxide containing solution 3, mixing solution 3 with second preform, and reacting at third temperature to load graphene on the outer surface of the second preform to obtain final product, where the second preform is composed of a hollow titanium dioxide shell layer, the titanium dioxide shell has holes, and the titanium dioxide shell layer is doped with nitrogen elements. USE - The method is useful for preparing titanium dioxide composite photocatalyst. ADVANTAGE - The method: utilizes polydopamine carrier as template; and is simple. The titanium dioxide composite photocatalyst has high utilization rate of solar light, high catalytic activity and prolonged service life. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for titanium dioxide composite photocatalyst comprising hollow titanium dioxide shell layer and graphene, where the graphene is loaded on the outer surface of the titanium dioxide shell layer.