Amin Ahmadpour - Amirkabir Petrochemical Complex, Research and Technology Centre, Mahshahr, Iran
Mohsen Zare - Department of Chemical Engineering, Petroleum University of Technology, Ahwaz, Iran
Milad Behjoomanesh - Department of Chemical Engineering, Petroleum University of Technology, Ahwaz, Iran
Majid Avazpour - Department of Chemical Engineering, Petroleum University of Technology, Ahwaz, Iran

Environmental contamination, which is growing around the world, is a serious problem that cannot be neglected. Among all contaminations, water pollution is a major problem. Azo dyes are one of the largest groups of pollutants found in the drinking water, dyestuff and the food and textile industries. TiO2/Fe3O4 and TiO2/Fe2O3 nanocomposites with various ratios were synthesized by an ultrasonicassisted deposition-precipitation method and their UV-light decolorization of methyl orange (MO) dye was investigated. The effect of Fe3O4/TiO2 and Fe2O3-TiO2nanocomposites ratio on the photocatalytic activity and magnetic property of the nanocomposites was studied by comparing their decolorization curves and magnetism in the presence of magnet, respectively. The results revealed that the decolorization efficiency of 1 wt% Fe3O4/TiO2 nanocomposite reached about 40% within 60 min UV irradiation at room temperature. However, this sample showed the least magnetism. Also, the ability of synthesized nanocomposites in holding the adsorbed methyl orange dye on their surface and the effect of pH were investigated

TiO2/Fe3O4 and TiO2/Fe2O3-nanocomposites ،Ultrasonic-assisted depositionprecipitation method،Photocatalytic activity،Methyl orange