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Nanoparticles of Fe₃O₄ magnetite were prepared using co-precipitation method. Titanium dioxide was then coated on the surface of Fe₃O₄ by sonicating of TBOT. Finally, Cu(NO₃)₂.6H₂O was loaded over Fe₃O₄/TiO₂ to prepare Fe₃O₄/TiO₂/CuO nanoparticle. The prepared compounds were characterized by FT-IR, DRS, EDX, XRD, XPS, VSM, FE-SEM and TEM. Based on XRD and TEM, titanium dioxide, as the anatase and rutile phases, is coated over Fe₃O₄ as a core shell structure. Based on the DRS spectra and band gap calculation, the band gap energy of Fe₃O₄/TiO₂/CuO was determined as 1.9 eV. Photocatalytic degradation of methylene blue (MB) was carried out in aqueous medium under sun light irradiation. The MB was depredated in neutral media (at pH = 7) at about 22 min. more than 99 %. The catalytic activity of the Fe₃O₄/TiO₂/CuO nanoparticles was applied in the reduction of para and …