Silver Purification from Waste for Bio–Sonochemical Synthesis of Ag2O Nanoparticles Using Cannabis sativa Flower Extract

Information from the abstract

Rapidly increasing manufacturing waste intensifies the need for highly efficient and economically feasible waste-to-resource technologies. This research presented an upcycling strategy that transforms silver (Ag)-bearing waste into functional silver oxide nanoparticles (Ag2O NPs) for potential use in biomedical applications. A two-step process of silver purification and the bio–sonochemical synthesis of Ag2O NPs was employed. First, the sequential purification of Ag via melt-refining and electrorefining was utilized to efficiently achieve a silver purity of ≥99.90%. This purification encouraged the recycling of various forms of Ag-bearing waste. Subsequently, the purified Ag was prepared as the precursor for the bio–sonochemical synthesis of Ag2O NPs, using Cannabis sativa SUT CBD12 flower extract as a natural reducing agent. The optimal conditions were adapted from a preliminary test using AgNO3 as the precursor. At initial concentrations of 0.01 M Ag solution, 1 mM PVP solution, and 10 g dried weight of Cannabis sativa SUT CBD12 added to 100 mL DI water, the optimal condition was obtained at the capping agent:reducing agent:precursor volume ratio of 0.6:0.006:1, pH 10–12, under a short sonication time of 2 min. The purified Ag (waste-derived) and AgNO3-derived Ag2O NPs shared similar spherical shapes and sizes of ~100–130 nm. The Ag2O NPs showed antibacterial effectiveness against S. aureus (ZOI of 26–29 mm) and E. coli (ZOI of 16–20 mm). Preliminary observations into the incorporation of Ag2O NPs into polycaprolactone (PCL) to produce electrospun PCL/Ag2O NPs nano fabrics shows a bead-free morphology, raising the possibility of a potential use in wound dressing. Following these preliminary explorations into potential uses and emission controls, a circular design maximizing the use of recycled resources is emphasized.

Why this record is monitored

This record has an Impact Signal of 72/100 based on recency, source, collaboration, and bibliographic signals. It prioritizes monitoring and is not a judgment of research quality.

Related topics: Nanoparticles: synthesis and applications · Gold and Silver Nanoparticles Synthesis and Applications · Ultrasound and Cavitation Phenomena