▎ 摘　　要

TiO2 nanoparticals doped with nickel were coated on graphene by solvo-thermal method. Then the CNTs were grown by in-situ chemical vapor deposition using nickel as catalyst. Finally, the graphene/Ni/TiO2/CNTs nanocomposites was obtained. The prepared graphene/Ni/TiO2/CNTs nanocomposite photocatalyst was characterized by X-ray diffraction, field emission scanning electron microscope, transmission electron microscope and Raman spectra. The photocatalytic activities of the samples were investigated by the photocatalytic degradation of methyl orange under UV and visible light. The results indicated that the photocatalytic activities increased from Ni/TiO2, graphene/Ni/TiO2, to graphene/Ni/TiO2/CNTs by the addition of graphene and CNTs. And the photocatalytic activities of graphene/Ni/TiO2/CNTs increased with the graphene amount increase. For the sample graphene/Ni/TiO2/CNTs with the highest graphene content, its photocatalytic degradation of MO under UV irradiation reached 98%, and its photocatalytic degradation of MO under visible light irradiation was 3.5 fold higher than that of sample Ni/TiO2.