▎ 摘　　要

NOVELTY - Preparing modified kaolin loaded graphene-phase carbon nitride/titania composite photocatalytic material, comprises preparing porous graphite phase carbon nitride from concentrated hydrochloric acid and ethylene glycol treated melamine as precursor, performing hydrothermal reaction of it with tetrabutyl titanate as titanium source and hydrochloric acid modified kaolin as carrier under action of aqueous ammonia and calcining to obtain final product. USE - The composite photocatalytic material is useful for treatment of cyanobacteria in eutrophic water bodies (claimed). ADVANTAGE - The composite photocatalytic material: has large specific surface area and wide visible spectrum response range, which improves photocatalytic performance of material. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: modified kaolin loaded graphene-phase carbon nitride/titania composite photocatalytic material prepared by above method, where the specific surface area of the material is 150-160 cm/g.2 use of the composite photocatalytic material in eutrophication water body cyanobacteria control, comprising adding modified kaolin loaded graphene-phase carbon nitride/titania composite photocatalytic material in cyanobacteria bloom sample liquid having pH value 7-8, simulating solar light irradiation for photo-catalytic reaction, measuring the change of chlorophyll concentration in the sample liquid before and after photo-catalytic reaction and calculating the chlorophyll removal rate in sample liquid.