Pravin O. Patil

Abstract

The study reports facile green in situ method for fabrication of reduced graphene oxide (rGO) based silver nanocomposites (rGO@AgNCs) using peanut skin (Arachis hypogaea) extract. The synthesized rGO@AgNCs were characterized by UV-visible spectroscopy, FTIR, SEM, EDX, particle size and zeta potential analysis. Furthermore, methylene blue (MB) and malachite green (MG) dyes degradation ability of rGO@AgNCs was investigated. The MB and MG dyes were found to be eliminated completely within 40 minutes in dark condition in the presence of 5 mg rGO@AgNCs.The investigation describes an ecofriendly and cost effective method for the in situ synthesis rGO@AgNCs. Keywords: Nanocomposites, Carbon materials, Agriculture waste, Nanoparticles, Peanut skin, Dye degradation.

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Abstract

A simple and green ecofriendly approach was revealed for the synthesis of silver-reduced graphene oxide nanocomposites (Ag@rGONCs) using jambul seed extract. The synthesized composites were characterized by UV–visible spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), Particle size and zeta potential analysis. The surface morphology and elemental analysis of synthesized Ag@rGONCs was done using scanning electron microscopy (SEM/EDX). The modified graphene can efficiently adsorb heavy metal ions and selectivity was precise due to presence of embedded silver ions on surface. The in situ decoration of silver ions on graphene oxide (GO) was accomplished in single step via one pot methodology using green precursor. The catalytic action of jamun seeds helps to reduce the GO to rGO and simultaneous decoration of silver nanoparticles. It also provided capping ability to avoid aggregation. The resultant nanocomposites (NCs) shown good selectivity towards the determination of Pb2+, Hg2+And Cr (VI) ions with the recognition limits of 50 nM, 15 nM and 500 nM, respectively Keywords: Graphene oxide, Green catalysis, Hevay metal sensing, Jambhul seeds.

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Abstract

Graphene, a 2D carbon sheet, has attracted tremendous attention in the scientific fraternity. Recently, graphene based metal nanocomposites (GO@Me-NCs) have opened an exciting avenue amongst researchers worldwide, owing to its exceptional properties. Graphene has a high electrical conductivity, exceptional chemical tolerance and large surface-to-volume ratio, which makes it an obvious template for nanocomposites. As a result, incorporation of graphene with inorganic materials such as metal has been the spotlight of research in recent years for their multi-functionalities. From the perspective of chemistry and materials, this account presents an overview of the green and benign processes for fabrication of GO@Me-NCs and their wide range of applications in various fields. Present review highlights the fabrication of GO@Me-NCs by green techniques using plant extracts, carbohydrates, vitamins, amino acids, etc. Finally a concluding remarks are also provided for the researchers, who are interested in designing advanced green strategies for the fabrication of graphene based metal nanocomposites. Keywords: Green synthesis, Graphene, Metal Nanocomposites

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