Plant-Mediated Synthesis of TiO₂ Nanoparticles: Comparative Study of Structural, Antibacterial, and Anticorrosive Properties
J. Maria Agnes Preethi1, Ms. D. Carolin Jeniba Rachel2
1II M.Sc Chemistry PG Department of Chemistry, St. Mary’s College (Autonomous) Thoothukudi–628001.
2Assistant Professor, PG Department of Chemistry, St. Mary’s College (Autonomous) Thoothukudi–628001.
Abstract
This study reports the green synthesis of titanium dioxide (TiO₂) nanoparticles using Monoon longifolium leaf extract and a comparative evaluation of two synthesis approaches, namely ultrasonication (TiO-A) and magnetic stirring (TiO-B). The formation and physicochemical properties of the nanoparticles were confirmed through UV–Visible spectroscopy, FTIR, XRD, FESEM, EDX, and TGA analyses, revealing nanoscale crystalline structures with effective surface functionalization by plant-derived biomolecules. Optical studies indicated characteristic UV absorption, while XRD confirmed phase purity and nanocrystalline nature. Morphological and elemental analyses further validated the successful formation of TiO₂ nanoparticles. The antibacterial activity demonstrated moderate efficacy against both Gram-positive and Gram-negative bacteria, with TiO-A showing comparatively higher inhibition due to improved surface characteristics. Additionally, anticorrosion studies using the weight-loss method revealed that nanoparticle-coated mild steel exhibited reduced corrosion rates in acidic, basic, and neutral media, with maximum protection observed under neutral conditions. The enhanced performance is attributed to the formation of a stable protective layer and effective surface coverage by nanoparticles. Overall, the findings highlight that plant-mediated TiO₂ nanoparticles, particularly TiO-A, possess promising antibacterial and anticorrosive properties, making them suitable for biomedical and environmental applications.
Key Words: Green synthesis, Titanium dioxide nanoparticles (TiO₂ NPs), Monoon longifolium, Ultrasonication, Magnetic stirring, Phytochemical reduction.
