Abstract

The present study reports about the catalytic degradation of methylene blue (MB) in presence of Gymnema sylvestre mediated synthesized silver nanoparticles (AgNPs). AgNPs was produced from green synthesis method using aqueous extract. Formation of AgNPs from the synthesis was confirmed by using UV-visible spectroscopy with the appearance of surface plasmon (SPR) bands around 370nm. Functional groups were identified by using FT-IR, the particle size and zeta potential of AgNPs concluded by DLS, the agglomeration in microstructure of biosynthesized AgNPs was revealed by field scanning electron microscope (SEM). The synthesized of Ag NPs showed three diffraction peaks at 2θ values of 36.62°, 42.51° and 65.84° which corresponds to the (111), (200) and (220) planes of face-centered cubic. The AgNPs shown very good antimicrobial Assay towards microbes isolated from contaminated dye soil. The photocatalytic activity of the synthesized silver nanoparticles was examined by degradation of methylene blue under sunlight irradiation. Green synthesized silver nanoparticles were effectively degrading the dye nearly 95% at 7h of exposure time.

Keywords: Gymnema sylvestre; AgNPs; Photocatalytic activity; Dye degradation; Antimicrobial assay