**5. Conclusions**

Water pollution is one the fundamental problems that have got the serious concerns of the researchers. Water poluution arises due to a number of reasons including domestic, industrial, agricultural, scinec and technology. The textile industry is the main industry that releases the dyes contaminated wastewater to the environment. A varities of protocols have been attempeted for the removal of dyes from aqueous body. Photocatalysis plays a significant role in various applications. Semiconductor metal oxides are used as photocatalysts in photocatalysis. Titanium dioxide is one of the metal oxides that has been used widely in photocatalytic applications. The titanium dioxide can be used as a photocatalyst under irradiation of ultraviolet light. The photocatalytic applications of titanium dioxide are limited by (i) wide band gap (ii) fast recombination of positive holes and electrons and (iii) activation under ultraviolet light only. Various modifications in the structure of titanium dioxide have been suggested to overcome the cited limitations. The doping of other elements in the structure of titanium dioxide and the formation of heterojunctions between titanium dioxide and other semiconductor metal oxides have been reported as effective attempts to enhance the photocatalytic performance of titanium dioxide.
