TiO2 nanoparticle is a heterogeneous semiconductor material with a photocatalytic properties in irradiation condition of the light source with a below 387 nm wavelength (equal to the Titanium dioxide bandgap, 3.2 eV). due to the low toxicities (in comparison with other semiconductors), cheap preparation, and strong oxidation abilities, there is a huge demand for wastewater treatment. in this study, the surface of commercial titanium dioxide nanoparticles (TiO2-P25 Degussa) that placed and immobilized on the surface of Expanded perlite (EP) was modified with the help of the Ultrasonic Co-precipitation method with alpha-Iron oxide nanoparticles (α-Fe2O3) and obtained nanocomposite are evaluated for the purification of water contain Methylene blue (M.B) pollution in aqueous solution. experiments are set up in a batch reactor (50-milliliter beaker) contain 35 ml synthetic dye wastewater. for Titanium dioxide nanoparticles to become activated, used 3 Ultraviolet lamps (UV-C) with the wavelength 285/7 nm and power of irradiations equal to the 15 watt. experiments at three pH levels (3, 7 and 11) was performed, the highest decolorization methylene blue from the water was observed at the following condition, pH equal to 11, light irradiation time equal to one hour, initial concentration of methylene blue is 10 mg/L, and 5 g/L of coated perlites, in reactor, that reached 99.7 % decolorization. the surface of Expanded perlite before and after coating with TiO2 and α-Fe2O3 nanoparticles was study and investigated with SEM test, also the disperse of these nanoparticles at surface of expanded perlite was studied with an SEM-MAP analyst.