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A novel nano compound TiO₂/[NiL(PBu₃)] (where L = (E)-1-[(2-Amino-5-nitrophenyl)iminio-methyl]naphthalene-2-olate) containing tridentate ONN Schiff bases was synthesized. The compound calcinated to Ni-doped TiO₂ at 650 °C. The structure and morphology of the obtained nano particles were identified by IR, XRD, FE-SEM, TEM and EDX techniques. Based on the XRD and EDX results of the new nano materials, the Schiff base complex supported on TiO₂ nano oxide. SEM and TEM micrographs of the TiO₂/complex and Ni-doped TiO₂ show that the resulting new materials have nano structure. The photo-catalytic activities of the samples were investigated by carrying out the photodegradation of methylene blue in aqueous solution under visible light. It was found that the Ni-doped TiO₂ samples enhanced the photo-catalytic efficiency of bare TiO₂ in photo-degrading the methylene blue. The reasons …