can retard possible electron-hole recombination thus leading to enhanced photoactivity. However, on increasing the dopant content the probability of charge carrier recombination is increased, explained by surplus Fe3+ ions which can cover the active sites on the surface of TiO2 particles and as a result the photocatalytic activity decreases [38]. Sources of this controversy could also be due to differences in the preparation methods and doping procedure which can lead to different structural and electronic characteristics of the samples [39, 40]. For a particular synthesis method, optimum dopant concentration directly affect the photocatalytic activity [17, 37]. Such photocatalytic behavior of Fe-doped TiO2 was observed by us and other researchers. In our study, maximum photoactivity toward RB5 dye was exhibited for the 0.5% Fe sample. The activity of this sample was higher than that of pure TiO2 (Figures 6 and 7) under both – UV and visible light irradiation.