Nickel oxide (NiO) nanoparticles (NPs) were successfully synthesised by using a simple and green synthetic route using the leaf extract of the plant Senna Occidentalis, which acts as a reducing and capping agent. The structural, optical, and morphological properties of NiO NPs have been analyzed through different techniques: X-ray diffractometer, scanning electron microscope (SEM), UV-visible spectroscopy, Fourier transformed infrared spectroscopy, and energy dispersive X-ray spectroscopy. The XRD pattern confirms the very good crystallinity of the face-centered cubic structure of the material, and the average particle size was found to be 22 nm. The SEM images of the synthesized NiO NPs show a spherical shape with an agglomeration matrix. The mean particle size of the SEM image shows good agreement with the XRD. The optical property of UV-visible absorption peaks at 335 nm. Moreover, the functional group of the synthesized sample was identified by the FT-IR study. The composition of elements present in the sample was shown in the EDX pattern. The results of the photocatalytic degradation study revealed that NiO NPs are potential photocatalysts in the degradation of crystal violet (CV) dye.
