• Gopala Krishna Murthy H.R.
• Sanjeevarayappa C

Green synthesis has emerged as a non-toxic, economical, and environmentally benign approach for the fabrication of nanoparticles, offering a sustainable alternative to conventional chemical and physical methods. Among various synthesis routes, hydrothermal synthesis is one of the most widely employed techniques for nanomaterial preparation due to its simplicity, high efficiency, and ability to produce materials over a wide temperature range, from ambient to elevated conditions. Titanium dioxide nanoparticles (TiO₂ NPs) have gained significant attention because of their diverse applications, particularly in agriculture, environmental remediation, and biomedical fields. TiO₂ NPs play an important role in enhancing plant growth and improving plant tolerance against abiotic stress. In the present study, TiO₂ nanoparticles were successfully green synthesized using an aqueous leaf extract of Erythrina variegata, which acts as both a reducing and capping agent, facilitating the conversion of metal precursors into stable metal-oxide nanoparticles. The UV–Vis spectrum exhibited a characteristic absorption band at 319.2 nm, confirming TiO₂ NP formation, with an optical band-gap energy of 2.41 eV. XRD analysis confirmed the crystalline and pure nature of the synthesized nanoparticles. Furthermore, the green-synthesized TiO₂ NPs demonstrated excellent photocatalytic degradation of methylene blue dye under UV irradiation and exhibited notable antibacterial activity against both Gram-positive and Gram-negative pathogenic bacteria, highlighting their multifunctional potential.

Synthesis, TiO2, Antibacterial

"HYDROTHERMAL SYNTHESIS OF TIO2 NANOPARTICLES FOR ANTIBACTERIAL ACTIVITY", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.13, Issue 1, page no.c478-c483, January-2026, Available :http://www.jetir.org/papers/JETIR2601257.pdf

"HYDROTHERMAL SYNTHESIS OF TIO2 NANOPARTICLES FOR ANTIBACTERIAL ACTIVITY", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.13, Issue 1, page no. ppc478-c483, January-2026, Available at : http://www.jetir.org/papers/JETIR2601257.pdf