Abstract
Using a simple approach, silver nanoparticles (Ag NPs) were synthesized from green coffee bean extract. The optical color change from yellowish to reddish-brown of the green-produced Ag NPs was initially observed, which was confirmed by the UV-Visible spectrophotometer’s surface plasmonic resonance (SPR) bands at 329 and 425 nm. The functional groups of green coffee-capped Ag NPs (GC-capped Ag NPs) were studied using a Fourier transform infrared spectrometer, revealing that Ag NPs had been capped by phytochemicals, resulting in excellent stability, and preventing nanoparticle aggregation. The presence of elemental silver is confirmed by energy dispersive X-ray analysis. In addition to the measurement of the zeta potential of the prepared GC-capped Ag NPs, the size distribution is evaluated by the dynamic light scattering. Depending on the nano-morphological study, the particle diameter of Ag NPs is 8.6 ± 3.5 nm, while the particle size of GC-capped Ag NPs is 29.9 ± 4.3 nm, implying the presence of well-dispersed nanospheres with an average capsulation layer of thickness 10.7 nm. The phyto-capped Ag NPs were found to be crystalline, having a face-centered cubic (FCC) lattice structure and Ag crystallite size of ~7.2 nm, according to the XRD crystallographic analysis. The catalytic performance of phyto-capped Ag NPs in the removal of methylene blue dye by sodium borohydride (NaBH4) was investigated for 12 min to reach a degradation efficiency of approximately 96%. The scavenging activities of 2,2-Diphenyl-1-picrylhydrazyl (DPPH) free radicals are also examined in comparison to previously reported Ag-based nano-catalysts, demonstrating a remarkable IC50 of 26.88 µg/mL, which is the first time it has been recorded.
Highlights
Water pollution, in the form of hazardous contaminants that poison industrialization’s water supplies, is the most serious threat to our lives
This synthesis is useful in treating free radicals and synthetic dyes, which are mainly present in wastewater and cause pollution to our environment
Looking at the surface plasmonic resonance (SPR) peak from 425 nm, one can see the asymmetrical shape of the broad band, i.e., the shoulder of the SPR peak towards 500 nm being from the aggregation
Summary
In the form of hazardous contaminants that poison industrialization’s water supplies, is the most serious threat to our lives. Terpenoids, alkaloids, glycosides, and phenolic compounds (flavonoids, coumarins, quinones, tannins, etc.) are discovered to be responsible for the reduction of silver ions into silver nanoparticles and for their stability, as observed in IR spectra in previous research [19,20] This plant’s bean was previously discovered to possess high quantities of phenolic chemicals, suggesting that it could be employed as a bio-reductant to create Ag NPs [19,20]. NPs generated from biogenic sources have been reported as a simple and cost-effective way to catalyze the removal of pollutants in this sector This synthesis is useful in treating free radicals and synthetic dyes, which are mainly present in wastewater and cause pollution to our environment. The antioxidant ability of these nanoparticles to scavenge DPPH free radicals is studied
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
