In this contribution an exceptionally simple, cost effective and reliable method for biosynthesis of ZnO nanoparticles through using Sageretia thea natural extracts as an effective chelating agent. The morphological analysis shows ZnO has nanoscale particles size 28.09 nm ± 5 nm, crystalline and possess distinct nanostructure hexagonal wurtzite structure. Effects of heat on ZnO synthesised at room temperature caused bonds with in the molecule to be broken exhibited continuous weight loss with 3 quasi sharp changes and 3 endothermic peaks occurring at 79°C, 228°C and 300°C. A proposed mechanism of reaction for Zn(NO3)2 6H2O precursor with bioactive compounds in Sageretia thea extract such as phenolic acid, flavonoids, natural sterolin and vitamin based compounds to form ZnO nanoparticles. Electrochemically ZnO nanoparticles are electroactive by exhibiting charge transfer resistance (Rct) 82006 Ω and bare GCE 3.7707 × 105 Ω. Showed good catalytic and conductivity which can be applied for pseudo capacitors.
Noluthando Mayedwa*, Ali Talha Khalil, Nametso Mongwaketsi, Nolubabalo Matinise, Zabta Khan Shinwari and Malik Maaza
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