تحضري وتوصيف مواد نانوية قائمة عىل 2TiO باستخدام التصنيع الحيوي و دراسة نشاطها التحفزيي و البيولوجي

Abstract

In this work, the nanocomposites TiO₂/ZnO and Zn₂TiO₄ were successfully green synthesized using an aqueous extract of parsley leaves (Petroselinum crispum) as both a reducing and stabilizing agent. The obtained nanoparticles were characterized using various analytical techniques. X-ray diffraction (XRD) analysis confirmed the crystalline nature and nanoscale crystallite size of Zn₂TiO₄, which was approximately 12 nm. For the TiO₂/ZnO nanocomposite, the particle size was of about 36 nm. Both materials exhibited an estimated band gap energy of approximately 3 eV. The photocatalytic performance evaluation showed high efficiency in the removal of Bengal Rose dye, achieving a degradation rate of about 94%. In addition, both nanocomposites demonstrated significant antibacterial activity against Staphylococcus aureus, Pseudomonas aeruginosa, and Escherichia coli. The TiO₂/ZnO nanocomposite exhibited strong antibacterial activity against all tested strains, with an increase in inhibition zone diameter as the concentration increased, indicating a dose-dependent relationship. In contrast, Zn₂TiO₄ showed weak and limited antibacterial activity, being effective only against Staphylococcus aureus and Pseudomonas aeruginosa at higher concentrations, while no activity was observed against Escherichia coli.