Preprint Article Version 2 Preserved in Portico This version is not peer-reviewed

Green Synthesis of novel Rhododendron arboreum Based Zinc Nanocomposites for Enhanced Antimicrobial and Photocatalytic Degradation Activities

Version 1 : Received: 25 March 2024 / Approved: 9 April 2024 / Online: 10 April 2024 (07:48:52 CEST)
Version 2 : Received: 10 April 2024 / Approved: 11 April 2024 / Online: 11 April 2024 (11:15:55 CEST)

A peer-reviewed article of this Preprint also exists.

Ali, S.; Sidra; Asghar, T.; Jan, M.I.; Waqas, M.; Ali, T.; Ullah, R.; Bari, A. Green Synthesis of Novel Rhododendron arboreum-Based Zinc Oxide Nanoparticles for Enhanced Antimicrobial and Photocatalytic Degradation Activities. Catalysts 2024, 14, 337. Ali, S.; Sidra; Asghar, T.; Jan, M.I.; Waqas, M.; Ali, T.; Ullah, R.; Bari, A. Green Synthesis of Novel Rhododendron arboreum-Based Zinc Oxide Nanoparticles for Enhanced Antimicrobial and Photocatalytic Degradation Activities. Catalysts 2024, 14, 337.

Abstract

Zinc nanoparticles (ZnNPs) open new opportunities for biomedical applications as a strategy against microbes and dye removal in an efficient way. The composite ZnNPs using Rhododendron arboreum (R. arboreum) stem bark were synthesized and characterized for UV-visible spectroscopy (UV-vis), Fourier transform infrared spectroscopy (FTIR), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and X-ray diffraction (XRD). The synthesized nanoparticles showed zones of inhibition of 23±0.09, 18±0.1 and 16±0.05 mm, against the Klebsiella pneumoniae (K. pneumoniae), Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli strains. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) values against K. pneumoniae, S. aureus, and E. coli were found to be 34±0.21 and 72.71±0.47, 47±0.11 and 94.86±0.84 and 94±0.18 and 185.43±0.16 µg/mL, respectively. The biosynthesized ZnNPs resulted in significant eradication of the outer and inner membranes of the bacterial cells. Likewise, the synthesized ZnNPs showed time-dependent photocatalytic degradation activity and revealed 65% methyl orange dye degradation with an irradiation period of 6 hours. The findings of this study suggest the suitability of the novel R. arboreum stem bark-based ZnNPs as an effective ameliorant against bactericidal activities and photocatalysts for the removal of hazardous water contaminants.

Keywords

Rhododendron arboreum; Zinc nanoparticles; Antimicrobial activity; Photocatalyst; Methyl orange dye

Subject

Chemistry and Materials Science, Nanotechnology

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