Elsevier

Applied Surface Science

Volume 406, 1 June 2017, Pages 339-347
Applied Surface Science

Full Length Article
ZnO nanoparticles via Moringa oleifera green synthesis: Physical properties & mechanism of formation

https://doi.org/10.1016/j.apsusc.2017.01.219Get rights and content
Under a Creative Commons license
open access

Highlights

  • Biosynthesis of ZnO nanoparticlesl by green process using Moringa Oliefera extract.

  • Electrochemical studies were confirmed by cyclic and Square wave voltammetry.

  • XRD, HRTEM, TGA/DSC, FTIR were used to characterized the nanoparticles.

Abstract

The research work involves the development of better and reliable method for the bio-fabrication of Zinc oxide nanoparticles through green method using Moringa Oleifera extract as an effective chelating agent. The electrochemical activity, crystalline structure, morphology, isothermal behavior, chemical composition and optical properties of ZnO nanoparticles were studied using various characterization techniques i.e. Cyclic voltammetry (CV), X-ray powder diffraction (XRD), High resolution transmission electron microscopy (HRTEM), Selected area electron diffraction (SEAD), Differential scanning calorimetry/thermogravimetric analysis (DSC/TGA), Fourier Transform Infrared analysis (FTIR) and Ultraviolet spectroscopy studies (UV–vis). The electrochemical analysis proved that the ZnO nano has high electrochemical activity without any modifications and therefore are considered as a potential candidate in electrochemical applications. The XRD pattern confirmed the crystallinity and pure phase of the sample. DSC/TGA analysis of ZnO sample (before anneal) revealed three endothermic peaks around 140.8 °C, 223.7 °C and 389.5 °C. These endothermic peaks are attributed to the loss of volatile surfactant, conversion of zinc hydroxide to zinc oxide nanoparticles and transformation of zinc oxide into zinc nanoparticles. Mechanisms of formation of the ZnO nanoparticles via the chemical reaction of the Zinc nitrate precursor with the bioactive compounds of the Moringa oleifera are proposed for each of the major family compounds: Vitamins, Flavonoids, and Phenolic acids.

Keywords

ZnO
Nanoparticles
Green chemistry
Electrochemical
Moringa oleifera

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