Abstract: TiO₂/graphene oxide（TiO₂/GO）composites were prepared by the sol-gel method using tetrabutyl titanate and graphite oxide as the main raw materials. The microstructure of TiO₂/GO composites was analysed by X-ray diffraction（XRD）and transmission electron microscopy（TEM）.Reactive brilliant red X-3B（X-3B）was used as model pollutant to study the photocatalytic activity of the composites. The effect of key factors（the content of graphene oxide，initial dye concentration and catalyst amount）on X-3B degradation was investigated. The results showed that graphene oxide was uniformly covered with sphere-like anatase TiO₂ nanopaticles，which have a diameter of about 10 nm. The results indicated that the photocatalytic activity of TiO₂/GO composites was higher than that of pure TiO₂ and the mixture of TiO₂ and graphite oxide under the same conditions，and the composites had the best photocatalytic activity，when the content of graphene oxide is 100 mg. Moreover，it was found that the rate of photocatalytic degradation decreased with the increase of the initial dye concentration，and the optimum amount of composites was 0.8g/L when the initial concentration of X-3B solution was 100 mg/L，and the degradation rate could reach 96% after 60 min reaction.

Key words: titania（TiO₂）, graphene oxide, sol-gel method, composite, photocatalytic degradation