Assessing Antibacterial Efficacy of Nanoparticles From Three Plant Extracts Against E.coli and Streptococci in Urban Wastewater
Year: 2026
Type: article
Abstract: Silver nanoparticles (Ag-NPs) obtained through green syntheses are gaining remarkable interest in water treatment due to their excellent chemical, physical, and biological properties. Ag-NPs were synthesized using three plant extracts: Carica papaya, Vernonia amygdalina, and Perilla frustescens var as reducing agent, and 6 mM of silver nitrate as precursor. The extracts demonstrated a good potential to reduce Ag(+1) to Ag(0) for Ag-NPs synthesis. Characterization of synthesized Ag-NPs was achieved through UV-Vis spectroscopy, Fourier Transform Infrared analysis, X-ray diffraction, optical microscopy, and zeta potential. The Surface Plasmon Resonance (SPR) was between 410 and 440 nm. The optical microscopy confirmed the presence of nanoparticles (NP) and an aggregate of NP. The synthesized NPs had a crystalline structure, confirmed by the XRD spectra. The average surface charge of NPs was negative (< -10 mV), indicating a potential for aggregation of the three NPs, as confirmed by the particle size distribution. Their antibacterial activities against E. coli and Streptococci were analyzed in urban wastewater. They exhibited good antibacterial properties, with BNPs being most effective at inhibiting both bacteria, followed by PNP and VNP. This reveals that NPs produced from different plants have different yields, properties, and antibacterial activities, and, most especially, can be used in water and wastewater treatment..
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W7166526127