Green Synthesis and Characterization of Zinc Oxide and Aluminum Oxide Nanoparticles; Corrosion-Inhibition and Antimicrobial Study
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Date
2025-12
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Lead City University, Ibadan
Abstract
The green technique for the synthesis of metal oxide Nanoparticles (NPs) is quick, simple, cost-effective, and environmentally friendly. This study aims to biogenically synthesize zinc oxide (ZnONP) and aluminum oxide (Al2O3NP) nanoparticles using Adonida merrilli (NM), Washingtonia robusta (M), Cassia javanica (C), and Casuarina equisetifolia (E) leaf extracts. The nanoparticles were characterized using UV-Vis spectroscopy, X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), Energy dispersive X-ray analyzer (EDX) and Scanning electron microscopy (SEM). The Corrosion inhibition studies were carried out in 0.5 M H2SO4
using gravimetric and potentiodynamic polarization methods. The samples were examined in an acidic media at varying concentration ranges of 500, 1000, 1500 and 2000 ppm. The antimicrobial study of the NPs was carried out on Salmonella typhi (Sa), Escherichia coli (Ec), Staphylococcus aureus (St), and Pseudomonas aeruginosa (Pa). The FT-IR analysis shows metal oxide absorption band values of 857 cm-1 (E-ZnONP), 700 cm-1 (C-ZnONP), 663 cm-1 (M-ZnONP), 715 cm-1 (NM-ZnONP). UV-Vis shows a plasmon resonance band value of 292 nm (C), 300 nm (C-ZnONP), 335 nm and 401nm (C-Al2O3Np), 290 nm (NM), 302 nm (NM-ZnONP), 336 nm and 401 nm (NM-Al2O3NP), 296 nm (M), 300 nm (M-ZnONP), 333 nm and 401 nm (M-Al2O3NP),v 288 nm (E), 308 nm (E-ZnONP), 317 nm and 401 nm (E-Al2O3NP). The SEM micrographs and the XRD spectra show spherical crystalline nanoparticles with an average particle size of 73.82 nm (NM- ZnONP), 10.13 nm (C-Al2O3NP), 41.85 nm (C-ZnONP), 71.50 nm (M-ZnONP), 22.06 nm (E-ZnONP), 8.63 nm (E- Al2O3NP), 5.86 nm (NM Al2O3-NP), 8.68 nm (M-Al2O3NP). The recorded Zone of inhibition (ZI) and Minimum Inhibitory Concentration (MIC) values of E-ZnONP are 30.00 mm (Sa), 18.00 mm (Ec), 30.00 mm (St), and 30.00 mm (Pa), with MIC of 31.25 mg/mL (Sa), 0.00 mg/mL (Ec), 31.25 mg/mL (St), 31.25 mg/mL (Pa). C-ZnONP, ZI of 32.00 mm (Sa), 19.00 mm (Ec) , 34.00 mm (St), 40.00 mm (Pa), and MIC of 31.25 mg/mL (Sa), 0.00 mg/mL (Ec), 31.25 mg/mL (St), 31.25 mg/mL (Pa), M-ZnONP, ZI of 36.00 mm (Sa), 30.00 mm (Ec), 36.00 mm (St), 38.00 mm (Pa), with MIC of 31.25 mg/mL (Sa), 250.00 mg/Ml (Ec), 125.00 mg/mL (St), 62.50 mg/ mL (Pa). NM-ZnONP, ZI of 30.00 mm (Sa), 32.00 mm (Ec), 40.00 mm (St), 36.00 mm (Pa) and MIC of 7.81 mg/mL (Sa),7.81 mg/mL (Ec),1.95 mg/mL (St), 3.90 mg/mL (Pa). C-Al2O3NP, ZI of 0.00 mm (Sa), 22.00 mm (Ec), 21.00 mm (St), 20.00 mm (Pa)], with zero MIC, while M-Al2O3NP recorded ZI of 0.00 mm (Sa), 19.00 mm (Ec), 25.00 mm (St), 22.00 mm (Pa) with Zero MIC values. The optimum recorded corrosion inhibitory efficiency values are 92.93% (500 ppm), 81.49% (1000 ppm), 82.99% (1500 ppm), 88.84% (2000 ppm) for E-ZnONP, 61.41% for M- Al2O3NP, 86.63% (500 ppm) for C extracts in 0.5 M H2SO4. E-ZnONP, C-ZnONP, M-ZnONP, and NM-ZnONP. E-ZnONP showed optimal corrosion resistance, while NM- ZnONP exhibited superior antimicrobial activity with low MIC values.The findings of this study showed that the biogenically synthesized nanoparticles possessed excellent therapeutic properties and were also viable for corrosion mitigation.
Keywords: Green Synthesis, Corrosion Inhibition, Plant extract, Metal-Oxide Nanoparticles, Surface Chemistry.
Word Count: 503
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Keywords
Green Synthesis, Corrosion Inhibition, Plant extract, Metal-Oxide Nanoparticles, Surface Chemistry.
Citation
kate Turabian