International Journal of Academic Multidisciplinary Research (IJAMR)   Year: 2021 | Volume: 5 | Issue: 3 | Page No.: 101-105 Synthesis TiO2 Nanoparticles and Apply in Photo Catalysis Application (Water treatment) Hiba Min Alla Elobeid Gibreel, Mubarak Dirar Abd-alla , Abdalskhi .S.M.H & Ahmed Alfaki Abstract: Titanium dioxide (TiO2), Nano crystalline was synthesized by TiCl4 solution was slowly added, it is distilled water in an ice bath. The obtained products have been characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicate that: the crystallite size average 51.88 nm for (TiO2) by XRD, and 53.5 nm by SEM. The XRD analysis exhibits a retile tetragonal phase of the (TiO2) Nano crystals. The effects of TiO2 different concentration on the Escherichia E- coli water samples after 4 week decrease pH-meter for all samples according to increase the concentration and dyes , also decrease of the number of viable cells when concentration of TiO2 increase and also decrease by week increase .