Green synthesis of Zinc Oxide Nanoparticles (ZnO-NPs) using Moringa oleifera L extract is successfully carried out. ZnO-NPs is precipitated out with the help of Moringa oleifera L water extract and thermally treated at 300, 350, 400, 450, and 500°C prior characterization. The prepared ZnO-NPs were characterized using Fourier Transform Infrared (FTIR), X-ray diffraction (XRD), and The Ultraviolet-visible (UV-Vis). The photocatalytic activity was determined based on its ability to decompose methylene blue in solution. FTIR analysis result shows the absorption band at 422-497 cm−1 which associated with stretching of Zn-O, and the intensity of O-H bond (3417 cm−1) decreases with increasing calcination temperature. The XRD spectrum shows a significant increase in electron properties and bond formation as the temperature increase. Calcination at 500°C results in the achievement of methylene blue degradation as a pollutant model of 80% after 60 minutes of exposure. This study shows that Moringa oleifera L. water extract can be used as a green alternative in ZnO-NPs synthesis and calcination temperature affects the photocatalytic activity of the prepared nanoparticles.
Structural properties and bonding characteristics of Mg doped ZnO by co- precipitation methods were characterized by using X-ray Diffraction (XRD) and Fourier Transforms Infrared (FTIR) spectroscopy. The analysis of FTIR showed peaks at 466.77 cm−1 and 451.31 cm−1 which correspond to the stretching of the oxygen bond in the ZnO structure and leads to defect formation by the oxygen atom detachment. This defect occupied by the Mg atom and proved by the widening of peak oxygen. The data XRD showed increasing the average size of ZnO crystal from 27.74 nm to 38.17 nm with the addition of 10% wt of Mg. These phenomena indicated agglomeration of the partial displacement of O2- by Mg2+ in the MgZnO structure. This study showed simple methods to combine with Mg atom and ZnO to produce potential materials for catalytic applications.
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