Abstract
This study used Hibiscus sabdariffa flowers to prepare and characterise nickel oxide nanoparticles that are non-toxic and environmentally advantageous (green synthesis). After two hours of heat treatment at 600 °C, XRD was employed to validate the cubic crystal structure of NiO-NPs. The crystal plane (200) corresponded to the optimal peak on the XRD, With an average crystalline size, as per Williamson-Hall's formula, is 46.26 nm, while as per Scherrer's formula, it is 24.40 nm. At 524, 420, and 468 cm-1, the FT-IR spectrum revealed a Ni-O vibration band. Throughout the surface microscopic analysis, Field-Emission Scanning Electron Microscopy (FE-SEM) revealed smooth, cylindrical rod-like crystals. As per the UV-Vis spectral curve, NiO-NPs had a direct bandgap (Eg) of 2.91 eV. NiO-NPs nanoparticles were shown to be more effective against gram-negative bacteria in terms of biological activities. P. aeruginosa was significantly more severely harmed than S. aureus.
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