Abstract
The present article reports an environmentally benign method for synthesizing silver nanoparticles using the fruit extract of Viburnum opulus L. as a source of bioactive compounds, which can act as reducing agents of the silver ions and also as stabilizing agents of the obtained nanoparticles. The catalytic ability of the synthesized silver nanoparticles (AgNPs) to remove toxic organic dyes was also evaluated. The biosynthesis of silver nanoparticles was firstly confirmed by UV-Vis spectral analysis, which revealed the presence of the characteristic absorption peak at 415 nm corresponding to the surface plasmon vibration of colloidal silver. Fourier-transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) studies were conducted to confirm the presence of bioactive phytocompounds, especially phenolics, as capping and stabilizing agents of the AgNPs. The size, morphology and crystalline nature of the synthesized AgNPs were investigated by transmission electron microscopy and X-ray diffraction techniques revealing that the obtained nanoparticles were spherical shaped, with an average diameter of 16 nm, monodispersed, face centered cubic nanoparticles. Further, the catalytic ability in the degradation of tartrazine, carmoisine and brilliant blue FCF dyes by NaBH4 was evaluated. The results demonstrated an efficient activity against all the investigated dyes being an outstanding catalyst for the degradation of brilliant blue FCF. This eco-friendly synthetic approach can generate new tools useful in environmental pollution control.
Highlights
The field of nanotechnology has gained lately a tremendous development especially due to the remarkable properties of the nanoscale materials, which significantly differ from those of bulk material
The total phenolic content of the fruit extract was determined by the Folin–Ciocalteu method and was found to be 211.3 mg gallic acid equivalents (GAE)/L
The high content of phenolic compounds enabled us to select these fruits as valuable candidates for the bio-inspired green synthesis of silver nanoparticles by using Viburnum opulus fruit extract as a source of reducing biomolecules for the silver ions and capping agents of the obtained silver nanoparticles conferring them a high stability
Summary
The field of nanotechnology has gained lately a tremendous development especially due to the remarkable properties of the nanoscale materials, which significantly differ from those of bulk material. Most of the synthetic approaches used to convert silver ions into elemental silver involve the use of hazardous chemicals as reducing agents such as hydrazine, sodium borohydride, sodium sulfide, the use of surfactants, polymers and dendrimers as capping agents or imply severe reaction conditions and might generate toxic byproducts, leading to environmental pollution This negative impact of the above mentioned synthetic methods led to development of new green, eco-friendly synthetic approaches, which use biological resources both as reducing and capping agents of the synthesized nanoparticles. Its fruits are consumed fresh, in beverages and food preparations such as sauces, marmalades and jellies They are reported to possess a high anti-oxidative effect, especially due to their high amount of polyphenolics, anthocyanins and ascorbic acid [13,14,15,16]. The valuable antioxidant compounds of these fruits were already successfully exploited by our research group, to achieve the green synthesis of silver nanoparticles and their in vitro and in vivo anti-inflammatory activity was reported [17]
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