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The reusability of CoFe 2 O 4@ ZnO core–shell nanoparticles (NPs) for the photocatalytic degradation of methylene blue (MB) under UV radiation was successfully investigated. CoFe 2 O 4@ ZnO NPs with various CoFe 2 O 4–to–ZnO concentration ratios were synthesized as magnetic photocatalysts. The X-ray diffraction spectra showed that the NPs had a cubic spinel ferrite phase structure and a hexagonal wurtzite phase of ZnO. Fourier-transform infrared spectra showed the presence of M oct-O, M tet-O, and Zn–O at 593, 347–389, and 410–429 cm− 1, respectively. The CoFe 2 O 4@ ZnO NPs had a saturation magnetization of approximately 30 emu g− 1 and a coercivity of approximately 280 Oe. The absorbance spectra showed that the absorbance peak of the CoFe 2 O 4@ ZnO NPs broadened and shifted to the right (higher wavelength) with increasing ZnO concentration. The CoFe 2 O 4@ ZnO NPs with …