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This study investigates photocatalytic activity performance of CoO/ZnO nanoparticles (NPs). CoO NPs was synthesized under the hydrothermal method, followed by calcination, while CoO/ZnO NPs were successfully synthesized using the precipitation method with various molar ratios of ZnO. X-ray diffraction and selected area electron diffraction showed that CoO and ZnO have a hexagonal structure; another phase appeared as a Co 3 O 4 spinel cubic structure. The crystallite size was decreased as the ZnO concentration increased. The transmission electron microscopy image of CoO/ZnO showed almost spherical, non-uniform, and slightly dispersed under agglomerated conditions with the particle size of 17.4±3.5 and 18.1±4.1 nm for molar ratio of 1: 2 and 1: 3, respectively. Besides, the corresponding chemical elements are confirmed by energy-dispersive X-ray spectroscopy. Fourier-transform infrared spectra …