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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.
关键词： Photocatalysis,Ecofriendly,Phytochemicals,Morti?o berry,Transmission Electron Microscopy,Silver nanoparticles
更新于2025-09-23 15:21:21
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Natural Dyes from Morti?±o (Vaccinium floribundum) as Sensitizers in Solar Cells
摘要： Photovoltaic energy presents environmental advantages; however, these advantages are limited by the cost of manufacturing solar cells and in many cases, scarce or dangerous materials are incorporated. Therefore, the use of natural dyes from morti?o (Vaccinium ?oribundum) as sensitizers in solar cells is proposed. The dyes were extracted by maceration in acidi?ed methanol (HCl, citric acid and tri?uoroacetic acid TFA) and were characterized by High-Performance Liquid Chromatography (HPLC), Thin-Layer Chromatography (TLC) and spectrometric methods (UV-Vis, IR and MS-MALDI). The construction and characterization of cells were in standard conditions. The study con?rms that pigments in morti?o are ?avonoids of the anthocyanidin group as: cyanidin-3-galactoside, and cyanidin-3-arabinoside. The e?ciency of solar cells was between 0.18–0.26%; the extraction with TFA in methanol leads to the best performance. Although they have low power conversion e?ciency, morti?o dyes could be an alternative to arti?cial sensitizers for solar cell technologies because they are harmless and abundant substances.
关键词： morti?o,e?ciency,solar cells,sensitizer,anthocyanins,dye
更新于2025-09-19 17:13:59