Titanium dioxide(TiO2) has been considered as one of the most promising materials for its application in photocatalysis and photo conversion because of its high chemical stability, corrosion resistance, nontoxicity and low cost. However, it shows photo catalytic activity only under the UV irradiation due to its wide band gap(3.0-3.2eV). In order to improve the photocatalytic activity or extend the photo absorption to the visible light region, in this paper, transition metal(element 24 to 30) ion doped TiO2 ...