In the field of water treatment, zirconium dioxide (ZrO2) is extensively used as a high-performance photocatalyst. Numerous studies have focused on improving the performance of ZrO2 photocatalysts by introducing metal oxides during synthesis. In this study, Fe3O4/ZrO2/CuO magnetic nanocomposites (NCs) were prepared and analysed using FT-IR (Fourier transform infrared) spectroscopy, UV-DRS (ultraviolet-visible diffuse reflectance spectroscopy), PL (photoluminescence), XRD (X-ray diffraction), FE-SEM (field emission scanning electron microscopy), EDS (energy dispersive spectroscopy), TEM (transmission electron microscopy), ICP (inductively coupled plasma) spectroscopy, N2 sorption analysis, VSM (vibrating sample magnetometry), TOC (total organic carbon) analysis, and XPS (X-ray photoelectron spectroscopy). The photocatalytic activity of the magnetic Fe3O4/ZrO2/CuO NC was assessed in the …