M HAMADANIAN - In stitute of Nano Science and Nano Technolo gy, University of Kashan, Kashan, Islamic Republic of Iran.D epartment of Physical Chemistry, Faculty of Chemistry, U niversity of Kashan, Islamic Republic of Iran
M SHAMSHIRI - D epartment of Physical Chemistry, Faculty of Chemistry, U niversity of Kashan, Islamic Republic of Iran

Dyes are one of main sourc es of water pollutants existing in our enviro nment.For water purifi cation treat ment variou s technologies are in use[۳]. Titanium dioxide is a veryactive photo catalyst,phy sical and chemical stability, inexpe nsive and of low biological toxicity[۱,۲]. The different morphologies of TiO۲ nan oparticles is used as photocatalyst. Heterogeneous photo catalysis by TiO۲ semiconductors is pro mising for elimination of hazardous environmental pollutants in air and wa ter [۳,۴]. In recent years,many experimental and research studied have been conducted to improve the photocatalytic activity of TiO۲,this paper follow s this purpose.

Codoped TiO۲, Photocatalytic activity, N anoparticle, Mo doped TiO۲