Different photocatalysis has recently attracted great attentions for environmental

Different pathogens and microbial species with toxic effects on the health are released into the environment.
Interactions among these pollutants are complicated, unforeseeable and thus may
have a serious influence on the environment. Increase of microorganism resistance to generally used
chemotherapeutics and highly severe hygienic standards in hospitals compel
finding and developing of new agents to be used in disinfection. Therefore, environmental
disinfection by the development of environmentally friendly methods
plays a crucial role in the prevention of
infectious diseases. Semiconductor photocatalysis has recently
attracted great attentions for environmental remediation and purification through
advanced oxidation processes 1,2. Heterogeneous semiconductor photocatalysis was reported as a suitable approach to detoxification from both industrial and biological pollutants in many researches 3,4. Among the semiconductors investigated, anatase TiO2
is one of the most commonly used materials for
photocatalytic degradation of chemical
and microbiological pollutants due to its non-toxic nature, low cost, abundance, UV-driven
high activity, photo
and thermal stability 5,6. Nevertheless, the photocatalytic activity of
TiO2 is constrained by two main problems which are the wide band gap (Ebg) that limit its application to ultra-violet region and the fast recombination of photogenerated electrons and holes 7,8.Both of these drawbacks have been studied to resolving by using several approaches such as doping the TiO2 with metallic or nonmetallic elements, dye sensitization and surface coupling with other semiconductors
to form a heterojunction9-11, that cause of improving the photocatalytic
activity of TiO2 for degradation of organic pollutants by shifting
the light absorption of TiO2 to visible-light region and retarding
the recombination of electron and hole 9,12.