▎ 摘　　要

The interest for expeditious separation of photocatalyst from treated water led to the production of magnetic TiO2-graphene oxide (GO) compounds, causing an essential drop in photoactivity. Therefore, the proper proportions of the starting materials produced via sol-gel, and hydrothermal methods were statistically determined according to the mixture design methodology to maximize the photo-degradation of dye under visible light, and solar irradiation. Although the decoration of TiO2-Fe3O4 core-shells onto GO sheets by the sol-gel route via 3aminopropyltrimethoxysilane resulted in the inappropriate magnetic properties, the hydrothermal method was successfully applied for the fabrication of magnetic compound. The nanocomposite containing the same proportions of GO, and Fe3O4, 4%, not only represented the optimal efficiency, 97%, but could be easily separated by the external magnetic field. The rapid degradation under the sunlight within 20 min was ascribed to a reduction in band gap energy, 1.46 eV, compared to that for anatase.