This study reports synthesizing two types of CdO NPs using CdSO4 and CdCl2 salts as precursor materials and Petroselinum extracts as a reducing agent. The nanoparticles were characterized by XRD, TEM, FE-SEM, EDX, and DLS techniques. The results showed that the properties of the prepared CdO nanoparticles varied depending on the type of salt used as a precursor. The XRD confirmed that the two prepared CdO nanoparticles have particle diameters of 58.35 CdSO4 and for CdCl2 is 44.02 nm. FE-SEM micrographs confirmed that the obtained particles have different shapes and sizes, and the average particle diameters were 77.16 and 109.57 nm for CdO nanoparticles from CdSO4 and CdCl2, respectively. The CdO nanoparticles that obtained from CdSO4 have a narrow particle size distribution was 265.6, in contrast, in the case of CdCl2, the distribution of the particles was 356.3 nm with a broad peak. Anti-bacterial evaluation of the prepared CdO exhibits revealed a significant inhibition against four types of bacteria Staphylococcus aureus, Streptococcus pneumonia, Klebsiella pneumonia, and Escherichia coli.
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