HighlightsThe green synthesis of AgNPs using bacterial EPS was performed.Spherical-shaped stabilized AgNPs and thin bio-film was observed in SEM and TEM.UV–Vis spectroscopy and XRD spectral analysis revealed the confirmation of the EPS-stabilized AgNPs.These AgNPs were shown to be highly thermo-stable up to 437.1 °C in TGA-DTA analysis.EPS-stabilized AgNPs revealed application in textile for degradation of azo-dyes.

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Herein we report the covalent grafting of chitosan on graphene oxide (GO) followed by a simple approach for anchoring silver (AgNPs) and gold (AuNPs) nanoparticles onto a chitosan grafted graphene oxide surface by a NaBH4 reduction method. Catalytic activity of prepared heterogeneous GO grafted chitosan stabilized silver and gold nanocatalysts (GO-Chit-Ag/AuNPs) was explored for the reduction of aromatic nitroarenes and degradation of hazardous azo dyes in the presence of NaBH4. Both catalysts were found to exhibit excellent catalytic activity towards the reduction of aromatic nitroarenes and azo dyes degradation. Furthermore, the nanocatalysts were found to be selective towards the reduction of nitro groups in halonitroarenes without any dehalogenation under mild conditions.

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In the present study, we report a novel self assembled uniform 3.9 nm silver nanoparticles (SAAgNPs), and their supported MoO 3 (Ag/MoO 3 ) nanocatalysts prepared by a simpler chemical method. The excellent metal/metal oxide interaction between Ag and MoO 3 has been exploited for catalytic degradation of azo dyes. The significant enhancement of azo dye degradation in the catalytic experiments was examined using UV-Vis absorption kinetics. The 4 wt % SAAgNPs loaded MoO 3 heterogeneous nanocatalyst (Ag/MoO 3 ) showed the highest azo dye degradation efficiency i. e., 37.9 x 10 À 3 s À 1 , 19.1 x 10 À 3 s À 1 for methyl orange (MO) and congo red (CR) respectively compared to that of a bare SAAgNPs in presence of NaBH 4 . The morphology, detailed size, electronic nature of the synthesized catalysts (SAAgNPs and Ag/MoO 3 ) has been investigated using TEM, HRTEM, XRD, UV-Vis and XPS studies.[a] Dr.