The synthesis of the nanomaterial is crucial for its characteristics, as well as physiological features. Green nanoparticle production, which reduces metal ions using natural extracts rather than industrial chemical agents, has been created to lower costs, minimize pollution, and improve environmental and human health safety. An aqueous and methanolic extract of a combination of Citrus sinensis and Citrus limetta peel was utilized for the green synthesis of cobalt nanoparticles. UV–Visible, Fourier-transform Infrared, X-ray diffraction (XRD), scanning of electron microscopy (SEM) and other techniques were employed to describe the prepared cobalt nanoparticles. The crystal structure of cobalt nanoparticles was revealed by XRD study. The SEM images of the cobalt nanoparticles revealed the usual subdivision dimensions of 20–30 nm. Using the well diffusion method, the antibacterial activity of the crude extract derived from the combination of the two plants mentioned above and the biosynthesized cobalt nanoparticles was assessed. The result showed that the crude extract and cobalt nanoparticles exhibited antibacterial activity and cobalt nanoparticles exhibited much higher activity than the crude extract. Overall, these findings revealed that formulated cobalt nanoparticle treatment considerably prevented the development of different micro-organisms.
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