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Magnetic core–shell CoFe 2 O 4@ ZnO nanoparticles have been successfully synthesized by using coprecipitation method to provide easy separated nanomaterials and high photocatalytic activity performance. Core–shell nanoparticles with various CoFe 2 O 4-to-ZnO molar ratio (1: 2, 1: 3, 1: 4, 1: 5) have been investigated over x-ray diffraction (XRD), transmission electron microscopy (TEM), UV-visible spectroscopy, and vibrating sample magnetometer. XRD spectra confirm the cubic spinel ferrite phase structure of CoFe 2 O 4 and the hexagonal wurtzite phase of ZnO. The crystallite size is found within the range of 14.9–20.6 nm. TEM measurement confirms the good crystallinity of the samples. The magnetic hysteresis shows that CoFe 2 O 4@ ZnO has high saturation magnetization of about 30 emu g− 1 and coercivity of about 300 Oe. Photocatalytic investigation was carried out using methylene blue (MB) under …