Green Synthesized Unmodified Silver Nanoparticles as Reproducible Dual Sensor for Mercuric Ions and Catalyst to Abate Environmental Pollutants

Green Synthesis of Silver Nanoparticles Using Acacia ehrenbergiana Plant Cortex Extract for Efficient Removal of Rhodamine B Cationic Dye from Wastewater and the Evaluation of Antimicrobial Activity

“…Various nanomaterials have been used as catalysts due to their unique physiochemical properties, as this process is favorable thermodynamically but unfavorable kinetically in the absence of a catalyst. − These catalysts include silver nanoparticles (Ag-NPs), − silver-copper oxide nanocomposites, modified Ag-NPs, gold nanoparticles, − iron oxide nanoparticles, activated carbon, graphene oxide, , zinc oxide nanoparticles, zirconium oxide, Cu/sodium borosilicate nanocomposite, Pd/calcium lignosulfonate nanocomposite, lignin-derived (nano)­materials, palladium nanoparticles, , and Cu NPs@Fe 3 O 4 . Nanomaterials can be generated through two primary approaches: the “top-down” and “bottom-up” methods.…”

The Role of Silver Nanoparticles in Electrochemical Sensors for Aquatic Environmental Analysis

“…Aggregation of AgNPs triggered by the addition of the analyte is a common optical sensing approach that can be converted to voltammetric [ 98 ] and amperometric sensors [ 101 ]. This strategy is feasible usually in the form of dual- [ 98 , 99 ] or multisensing [ 102 , 106 , 111 , 122 ] platforms, with optical, fluorescent, and electrochemical response towards the detection of HMs. In contrast to the colorimetric assay, electrochemical aggregation of functional silver material results in voltammetric/amperometric signal amplification or inhibition, depending on the chemistry of the nanoparticle stabilizer and the target analyte.…”

“…For the aggregation-induced sensing mechanism, the role of biogenic synthesized AgNPs is highlighted because biogenic molecules are rich in electron-donor groups that successfully act as analyte-chelating ligands. AgNPs synthesized using fungus Agaricus bisporus [ 98 ] and the Mimosa diplotricha leaf extract [ 99 ] were found to be potent sensors towards hazardous mercury, boosting the DPV responses through strong metal–nanosilver stabilizer complexation. Green AgNPs also play a prominent role as multisensor probes for mercury [ 102 ], cadmium [ 106 ], arsenic [ 120 ], and chromium [ 122 ].…”

“…Gold (Au) disc electrodes predominate in the development of voltammetric sensors for the detection of arsenic in river water and lake water [ 50 , 119 , 120 ], but are also suitable as substrates for the selective and sensitive detection of nitrates in seawater matrices [ 146 , 149 ]. Platinum (Pt) electrodes, decorated with AgNPs biosynthesized utilizing Agaricus bisporus mushroom extract [ 98 ] and Mimosa diplotricha plant leaf extract [ 99 ], were found to be an excellent solution for the selective and sensitive detection of toxic Hg(II) in lake water, tap water, and river water specimens, respectively. In addition, a Pt disc electrode decorated with bark green AgNPs ( Moringa oleifera bark extract) was utilized to detect hazardous Cu(II) from electroplating plant effluents [ 111 ], while AgNPs produced with garlic extract were used for the quantification of Cd(II) in lakes [ 106 ].…”

“…The analytical performance of the AgNPs-AB/PE sensor manifested in well-defined DPV plots (scan rate of 100 mV s −1 ), with peak current linear to mercury at micromolar concentration. Another dual sensor for the detection of Hg(II) in water specimens based on biosynthesized AgNPs was fabricated by Punnoose et al [ 99 ]. The AgNP-MD ( Mimosa diplotricha )-modified Pt electrode exhibited a well-defined redox pair at the potentials of +336 mV and +80 mV, which was attributed to the Ag + /Ag conversion.…”