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Environmental pollution and various bacterial strains cause severe health problems. Thus a need exists to synthesize new materials and develop new techniques which can be used against these hazardous pathogens and components. In this research work, sustainable and effective Co/ZnO nanocomposites were prepared via a new hydrothermal technique and ammonia evaporation method. The synthesized nanomaterial was analytically characterized through various techniques such as X-ray diffraction (XRD), UV-vis spectroscopy, Scanning electron microscope (SEM), High transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FTIR), Energy-dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS). The as prepared nanocomposite was tested for photodegradation of methylene blue (MB). This test was performed both in visible light and in dark condition …