Green synthesis and optimized annealing temperature effects on zinc oxide nanoparticles using mango peel extract

Supamas  WIRUNCHIT; Natchayaporn  SAKULPEEB; Woradech  MEEDECH; Sutee  CHUTIPAIJIT; Wantana KOETNIYOM

doi:10.55713/jmmm.v36i3.2541

Authors

Supamas WIRUNCHIT College of Materials Innovation and Technology (CMIT), King Mongkut’s Institute of Technology Ladkrabang, Ladkrabang, Bangkok 10520, Thailand
Natchayaporn SAKULPEEB College of Materials Innovation and Technology (CMIT), King Mongkut’s Institute of Technology Ladkrabang, Ladkrabang, Bangkok 10520, Thailand
Woradech MEEDECH College of Materials Innovation and Technology (CMIT), King Mongkut’s Institute of Technology Ladkrabang, Ladkrabang, Bangkok 10520, Thailand
Sutee CHUTIPAIJIT College of Materials Innovation and Technology (CMIT), King Mongkut’s Institute of Technology Ladkrabang, Ladkrabang, Bangkok 10520, Thailand
Wantana KOETNIYOM Department of Industrial Physics and Medical Instrumentation, Faculty of Applied Science, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand; Lasers and Optics Research Center (LANDOS), King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand

DOI:

https://doi.org/10.55713/jmmm.v36i3.2541

Keywords:

Green Synthesis, Annealing Temperature, Zinc Oxide Nanoparticles, Mango Peel Extract

Abstract

This study presents the green synthesis of zinc oxide nanoparticles (ZnO-NPs) using mango peel extract (MgE) as a natural reducing and stabilizing agent. Phytochemical extraction was performed with deionized water, ethanol, and methanol for 1 h to 5 h, with deionized water at 4 h yielding the highest flavonoid content. Using zinc nitrate as a precursor, 25 mL of MgE successfully facilitated the synthesis of ZnO-NPs (ZnO-25MgE). It was found that annealing temperature at 400℃ for 6 h produced pure ZnO. The obtained nanoparticles were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and field emission scanning electron microscopy (FE-SEM). XRD confirmed the crystalline structure with an average size of 6.67 nm, while FT-IR and FE-SEM analyses revealed Zn–O vibrations, residual organics, and nanoscale morphology. Thermogravimetric analysis (TGA) indicated the appropriate annealing temperature for the removal of organics. For comparison, chemically synthesized ZnO was also characterized, and its antibacterial activity was assessed via disc diffusion against Escherichia coli and Staphylococcus aureus. The results demonstrated notable inhibition, highlighting the potential of biosynthesized ZnO-NPs for antimicrobial applications.

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