The photodegradation technique has been identified as the most effective environmentally friendly approach for removing organic dyes from contaminated water. In this study, waste foundry sand- ferrite (WFS-Fe3O4) composites were synthesized using co-precipitation method.The composite was characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), zeta potential, and particle size analysis. FT-IR confirmed the presence of strong chemical bonding and functional groups at the interface of WFS and Fe3O4. The photocatalytic activity of these catalysts was assessed through the degradation of methylene blue (MB) dye under visible light irradiation. The results demonstrate that the synthesized composites exhibit significant magnetic and photocatalytic performance.