Green synthesis of graphene based manocomposite for sensing of heavy metals

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.