الفهرس | Only 14 pages are availabe for public view |
Abstract Silver and gold nanoparticles have wide applications in catalysis, sensing, optics, electronics and biomedical fields. Plant-mediated synthesis of nanoparticles represents an efficient safe alternative for the traditional synthetic routes. Plants contain abundant natural compounds such as terpenoids, steroids, flavonoids, tannins other nutritional compounds. These natural products can act as reducing and stabilizing agents for the bioreduction reaction to synthesized novel metallic nanoparticles. Phytosynthesized nanoparticles have biocompatibility and reduced toxicity due to capping them with the biogenic surfactants of plants which can contribute to the stability of the nanoparticles and influence their properties. In this study, silver and gold nanoparticles were synthesized via a green route using 70% alcoholic F. sycomorus leaf extract. Tuning of the experimental parameters (namely, extract quantity, metal ion concentration, and pH-value) allowed a controlled synthesis of the size, shape and size distribution of the nanoparticles. UV-visible spectroscopy had been utilized to monitor the spectral profile changes of the surface plasmon resonance (SPR) of the nanoparticles at various conditions. The SPR band varies between 420 and 450 nm and between 525 and 565 nm for silver and gold nanoparticles, respectively, depending on the different reaction parameters. The successful preparation of spherical monodispersed AgNPs (4 nm) and AuNPs (11 nm) was confirmed by transmission electron microscopic (TEM) analysis. The FT-IR data indicated that flavonoid glycosides played a major role in the reduction and stabilizing of metal ions. The as-prepared AgNPs and AuNPs had used as efficient green catalysts for methylene blue degradation in the presence of NaBH4 |