The reactivity of metallic and bimetallic nanoparticles of copper and silver towards in vitro study has been quantitatively investigated.

We propose the green synthesis of Ag@Fe2O3 nanocomposites for excellent antibacterial activity with MIC ≤ 20 mg ml−1 for E. coli and S. aureus bacteria.

Biofriendly green sustainable nanocatalyst Au@NiAg with high catalytic activity was prepared for hydrogenation and degradation of aquatic contaminants such as 4-nitrophenol (4-NP), Methyl Orange (MO), and Orange G (OG). Synthesized Au@Ni nanoparticles have a triangular shape while the Au@NiAg nanoparticles are of spherical shape and of smaller size, attributed to the digestive ripening of the Au@Ni where silver ion was deposited on the host Au@Ni nanoparticle surface. The Au@NiAg nanoparticles catalyzed hydrogenation of 4-nitrophenol and reduction of organic dyes follow Langmuir−Hinshelwood kinetics. The Au@NiAg nanoparticles have shown excellent catalytic activity with activity factors of 3167s -1 g -1 , 5476s -1 g -1 , and 3810 s −1 g −1 for 4-NP, MO, and OG, respectively. Silver nanoparticles act as cocatalyst for overall improvement of the performance of Au@NiAg. Above all the involvement of leaf extract mediated synthesis will open up an area to the production of sustainable, ecofriendlym and nontoxic core−shell nanocatalysts with exemplary catalytic activity.

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