Green synthesis and characterization of zinc oxide nanoparticles using bush tea (  DC) natural extract: assessment of the synthesis process.

Gabriel Amani Kaningini, Shohreh Azizi, Hlengilizwe Nyoni, Fhatuwani Nixwel Mudau, Keletso Cecilia Mohale, Malik Maaza
Author Information
  1. Gabriel Amani Kaningini: UNESCO-UNISA Africa Chair in Nanosciences and Nanotechnology College of Graduates Studies University of South Africa, Muckleneuk Ridge, Pretoria, 392, South Africa. ORCID
  2. Shohreh Azizi: UNESCO-UNISA Africa Chair in Nanosciences and Nanotechnology College of Graduates Studies University of South Africa, Muckleneuk Ridge, Pretoria, 392, South Africa.
  3. Hlengilizwe Nyoni: Nanotechnology and Water Sustainability Research (NanoWS) Unit, College of Science Engineering and Technology, University of South Africa, Johannesburg, 1709, South Africa.
  4. Fhatuwani Nixwel Mudau: Department of Agriculture and Animal Health, College of Agriculture and Environmental Sciences, University of South Africa, Private Bag X6, Florida, 1710, South Africa. ORCID
  5. Keletso Cecilia Mohale: Department of Agriculture and Animal Health, College of Agriculture and Environmental Sciences, University of South Africa, Private Bag X6, Florida, 1710, South Africa.
  6. Malik Maaza: UNESCO-UNISA Africa Chair in Nanosciences and Nanotechnology College of Graduates Studies University of South Africa, Muckleneuk Ridge, Pretoria, 392, South Africa.

Abstract

Nanoparticles are globally synthesized for their antimicrobial, anti-inflammatory, wound healing, catalytic, magnetic, optical, and electronic properties that have put them at the forefront of a wide variety of studies. Among them, zinc oxide (ZnO) has received much consideration due to its technological and medicinal applications. In this study, we report on the synthesis process of ZnO nanoparticles using   DC natural extract as a reducing agent.    Liquid chromatography-mass spectrometry (LC-MS) was used to identify the compounds responsible for the synthesis of ZnO nanoparticles. Structural, morphological and optical properties of the synthesized nanoparticles have been characterized through X-ray diffraction (XRD), Ultraviolet-visible spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS).    LC-MS results showed that different flavonoids and polyphenols, as well as Coumarin, an aromatic compound, reacted with the precursor to form ZnO nanoparticles. XRD and UV-Vis analysis confirmed the synthesis of ZnO nanoparticles, with a spherical shape showed in SEM images. The quasi-spherical ZnO crystals had an average crystallite size of 24 nm. EDS and FTIR analysis confirmed that the powders were pure with no other phase or impurity.    This study successfully demonstrated that the natural plant extract of   DC. can be used in the bio-reduction of zinc nitrate hexahydrate to prepare pure ZnO nanoparticles, thus, extending the use of this plant to an industrial level.

Keywords

MeSH Term

Zinc Oxide
Reducing Agents
Metal Nanoparticles
Plant Extracts
Anti-Infective Agents
Coumarins
Flavonoids
Tea

Chemicals

Zinc Oxide
Reducing Agents
Plant Extracts
Anti-Infective Agents
Coumarins
Flavonoids
Tea

Word Cloud

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