▎ 摘　　要

NOVELTY - Preparing iodine doped titanium dioxide-graphene composite photo-catalyst comprises e.g. ultrasonically dispersing graphene oxide in deionized water, centrifuging, refrigerating to obtain brown yellow ice solution, adding titanium tetrachloride, preparing light yellow sol-gel, carrying out hydro-thermal reaction, centrifuging, drying to obtain grey powder, i.e. titanium dioxide-graphene composite photo-catalyst, adding 55% hydrogen iodide, placing in oil bath, stirring to obtain red solution, centrifuging, washing and drying to obtain black powder, i.e. composite photo-catalyst product. USE - The method is useful for preparing iodine doped titanium dioxide-graphene composite photo-catalyst (claimed). ADVANTAGE - The method produces catalyst with greatly improved titanium dioxide/graphene visible light photocatalytic activity, and expanded spectrum response range of titanium dioxide in visible light region. DETAILED DESCRIPTION - Preparing iodine doped titanium dioxide-graphene composite photo-catalyst comprises mixing titanium tetrachloride and graphene oxide aqueous solution and preparing titanium dioxide/graphene by hydrothermal reduction, then using 55% hydrogen iodide for thermal processing iodine-doped titanium dioxide/graphene, and preparing iodine/titanium dioxide/graphene composite photocatalyst with high visible light catalytic activity, where the method specifically comprises (i) using graphite powder according to Hummers method to obtain oxidized graphite, then ultrasonically dispersing the graphene oxide in deionized water, centrifuging at 6000 revolutions/minute for 5 minutes, then transferring to a refrigerator and refrigerating at 5 degrees C for 1 hour to obtain brown yellow ice solution, then adding titanium tetrachloride into the brown-yellow ice solution, stirring at room temperature to obtain light yellow sol-gel, transferring the light yellow sol into a polytetrafluoroethylene lined reaction kettle at 100 degrees C, carrying out hydro-thermal reaction for 24 hours, naturally cooling to room temperature, taking out reactant, centrifuging, washing and drying it in vacuum at 60 degrees C to obtain grey powder, i.e. titanium dioxide-graphene composite photo-catalyst, where the ratio of graphene oxide material and deionized water is 1:2000; the volume ratio of titanium tetrachloride and graphene oxide material is 23:1, and (ii) adding the step (i) obtained grey powder dropwise in 55% hydrogen iodide, placing in a 100 degrees C oil bath and stirring for 2 hours to obtain red solution, naturally cooling to room temperature, centrifuging, washing and drying it in vacuum at 60 degrees C to obtain the black powder, i.e. iodine doped titanium dioxide-graphene composite photo-catalyst, where the ratio of grey powder and 55% hydrogen iodide is 1:6.