The biosynthesis of nanoparticles has been proposed as an environmentally responsible and costeffective alternative to chemical and physical approaches. In the current investigation, Pithecellobium dulce bark extract was used to synthesis silver nanoparticles. The bark extract has the ability to stabilise and reduce silver nitrate. UV-visible spectrometer, FT-IR spectroscopy, XRD analysis and scanning electron microscope (SEM) were used to characterise the synthesised silver oxide nanoparticles catalytic activity in reducing p-nitrophenol (4-NP) to p-aminophenol (4-AP) was examined. The antibacterial activity against gram-positive and gramnegative was found.

Keywords : Biosynthesis, Plant Extract, Silver Oxide Nanoparticles, Catalytic and Antibacterial Activity.