Biogenic Silver Nanoparticles as Sensors of Cu²⁺ and Pb²⁺ in Aqueous Solutions

Abstract

Silver nanoparticles (Ag-NPs) were bio-synthesized using Camellia sinensis (green tea) aqueous extract. Nanoparticles prepared with 10 -3 M AgNO 3 solution, using 3mL of green tea extract and at 60˚C, have spherical shape with a mean diameter of 7nm. The formation of the nanoparticles was confirmed by UV-Vis spectrophotometry through studies of the surface plasmon resonance (SPR). The morphology, size and crystalline structure of the Ag-NPs were determined using high definition transmission electron microscopy (TEM). Moreover, these green synthesized Ag-NPs were found to exhibit good sensing properties to war d s Cu 2+ and Pb 2+ ions in aqueous solutions. This metal ions-sensing ability of the biogenic Ag-NPs was monitored by UV-Vis spectrophotometry (SPR analyses) and fluorescence spectroscopy.

Biogenic Silver Nanoparticles: What We Know and What Do We Need to Know?

“…Therefore, their removal is required to minimize environmental pollution. In this context, Hoyos et al [224] developed a nanosensor using AgNPs synthesized from an aqueous extract of Camellia sinensis (green tea) having a mean diameter of 7 nm. Furthermore, these green synthesized AgNPs were found to exhibit good sensing properties towards Cu 2+ and Pb 2+ ions in aqueous solutions.…”

Smart nano-architectures as potential sensing tools for detecting heavy metal ions in aqueous matrices

“…With the enhancing Pb 2+ ions concentration within a range of 5-100 nM (LOD = 5 nM), the fluorescence intensity of NPs reduced. Further, biosynthesized silver nanoparticles were used as fluorescent nano-probes for the advancement of turn-on type Pb 2+ ions sensors in water [86]. Moreover, functionalized silver nanoparticles with the organic compounds served as an excellent sensing site for metal ions identification.…”

Plasmonic Sensing of Aqueous-Divalent Metal Ions by Biogenic Gold Nanoparticles

“…1 g of commercial green tea (Lagg's) was boiled for 20 min in 90 mL of deionized water; upon cooling, the infusion was vacuum filtered. The resulting extract was stored for a day on a flask at room temperature and used as a reducing and capping agent [31]. 2.5.…”

“…To know the sensibility effect of the biogenic AuNPs obtained with 0.4 mL of Camellia sinensis extract towards Ca 2+ , Cu 2+ , Sr 2+ , and Zn 2+ metal ions, solutions of these metals, with concentrations from 10 -3 to 10 -6 M, were added to the AuNP solutions [16,26,31]. The degree of the bathochromic shift of the LSPR depends on the concentration of the metal ions in the NP solution [16].…”

“…The biosynthesis of AuNPs was carried out using 5 mL of 10 -3 M of HauCl 4 solution and 0.4 mL of Camellia sinensis extract. The synthesis performed was an adaptation of a method previously reported by us[31].2.4. Characterization of AuNPs.…”