▎ 摘　　要

NOVELTY - Preparing modified graphene-loaded titanium dioxide composite photocatalyst, comprises obtaining a graphene oxide suspension through an improved Hummers method, and adding triethanolamine into suspension for reacting to obtain a modified graphene oxide suspension liquid; adding the suspension liquid into a sulfuric acid solution; soaking, and centrifugal separation to obtain a composite photocatalyst precursor; adding the precursor into an alkali solution to perform hydrothermal reaction; pre-drying the product, and calcining and reducing. USE - The method is useful for preparing modified graphene-loaded titanium dioxide composite photocatalyst (claimed). ADVANTAGE - The photocatalyst is stable in structure, high in specific surface area, high in photocatalytic activity, small in titanium dioxide particle size (about 10 nm), uniform in distribution, and difficult to agglomerate. The method is easy to operate and low in cost, and meets industrial production. DETAILED DESCRIPTION - Preparing modified graphene-loaded titanium dioxide composite photocatalyst, comprises obtaining a graphene oxide suspension through an improved Hummers method, and adding triethanolamine into the graphene oxide suspension for reacting at 60-120 degrees C to obtain a modified graphene oxide suspension liquid; dropwise adding the obtained modified graphene oxide suspension liquid into a sulfuric acid solution in which titanyl sulfate is dissolved; performing ultrasonic auxiliary soaking, and then performing centrifugal separation to obtain a composite photocatalyst precursor; adding the composite photocatalyst precursor into an alkali solution to perform hydrothermal reaction at 70-100 degrees C; pre-drying hydrothermal reaction product at 400-500 degrees C, and performing high-temperature calcining and reducing in an air atmosphere.