| Summary: | Doping with noble metal ions or doping with nitrogen has been attempted to prepare TiO<sub>2</sub> that reacts even in visible light. In this study, TiO<sub>2</sub> was doped with nitrogen and various metal ions instead of noble metals. The TiO<sub>2</sub> photocatalysts doped with metal ions (Fe, Ag, Ni) and nitrogen were prepared by a sol-gel method. Their physicochemical properties were characterized and their photocatalytic activities were investigated under visible light irradiation. In TiO<sub>2</sub> doped with metal ions and nitrogen, the light absorption region was extended to visible light. The photoluminescence intensity was much greater in N/Ni/TiO<sub>2</sub> than in N/Ag/TiO<sub>2</sub> and N/Fe/TiO<sub>2</sub>. The photolysis activities of N/Ni/TiO<sub>2</sub> were the highest in formaldehyde decomposition and methylene blue decomposition. The sterilization efficiency of N/Ni/TiO<sub>2</sub> was the highest in the evaluation test for the inhibition of the proliferation of <i>Pseudomonas aeruginosa</i>. The bandgap of N/Ni/TiO<sub>2</sub> was 2.4 eV, which was significantly lower than that of anatase TiO<sub>2</sub> (3.2 eV). The N/Ni/TiO<sub>2</sub> had a much higher optical intensity than other metal ion-doped TiO<sub>2</sub>, so it was highly active under visible light irradiation.
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