Ecofriendly synthesis of monodispersed silver nanoparticles using Andean Morti?o berry as reductant and its photocatalytic activity

摘要： Morti?o (Vaccinium floribundum Kunth) berry is an endemic fruit from the Andes region and rich in vitamins, polyphenolic and anthocyanin compounds. The present report describes the Morti?o berry extract mediated biosynthesis of silver nanoparticles and their photocatalytic evaluations. The conditions for the synthesis of silver nanoparticles were optimised by adjusting amount of berry extract, pH, and time. Biosynthesis of silver nanoparticles was primarily identified by the appearance of yellow colour and confirmed by measurements of UV-visible spectroscopy. Particle size distribution, morphology and crystalline nature of silver nanoparticles were characterised by transmission electron microscopy, dynamic light scattering, and X-ray diffraction techniques. All characterisation technique reveals that the generated silver nanoparticles were stable, non-aggregated, monodispersed, spherical shape with an average size of 20.5 ± 1.5 nm and face centred cubic in nature. In order to evaluate photocatalytic activity, degradation of methylene blue dye by silver nanoparticles under sunlight was used as model system. It showed photocatalytic activity against methylene blue dye (5 mg/L, k= 0.00707788 min-1), efficiently. This ecofriendly approach highlighted the importance of Morti?o berry in green nanotechnology and generates a new scope of other Andean fruits in engineering applications.