الفهرس | Only 14 pages are availabe for public view |
Abstract In this work, rapid, simple and cheap methods are presented for the green synthesis of silver nanoparticles (AgNPs) using morin as a reducing agent without utilizing any toxic reagents. Morin/silver nanoparticles/polyvinyl alcohol (morin/AgNPs/PVA) nanocomposite was synthesized by a liquid-phase route using PVA as a stabilizer. Tuning of the experimental parameters allowed control of the size and size distribution of the NPs. UV-visible (UV-vis) spectroscopy had been utilized to monitor the spectral profile changes of the surface plasmon resonance (SPR) band of AgNPs at various conditions. The prepared nanocomposite was structurally characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The antimicrobial activity of the prepared morin/AgNPs/PVA was evaluated. Furthermore, a cross-linked free-standing film of morin/AgNPs/PVA was prepared and used as a catalyst for the reduction of 4-nitrophenol (4-NP). This provides an effective method to recover the nanocatalyst easily after finishing the reaction and obtain the product free from the metal. The catalytic experiment was carried out under different operational parameters to identify the optimal conditions for the model solutions. On the other hand, a solid-state method for large-scale production of morin/AgNPs (by ball milling) had been developed. The synthesized morin/AgNPs were characterized by different spectroscopic techniques. The prepared morin/AgNPs showed higher antioxidant and antimicrobial activities compared to morin. The use of a solid-state method would avoid long term storage issues (aggregation/agglomeration and/or oxidation) through the production of nanoparticles in a dry form. The shipping costs would be reduced, and mass production could be attained without the need for drying, concentrating, or separation |