Green Synthesis of Silver Nanoparticle in Calotropis Procera flower extract and its application for Fe2+sensing in aqueous solution

The silver nanoparticles (AgNPs) was synthesized in Calotropis procera extract. The synthesized AgNPs were characterized by UV–vis spectoscopy, dynamic light scattering (DLS)and transmission electron microscopy (TEM). DLS and TEM analysis of the synthesized AgNPs clearly showed the nanoscale particle size distribution having spherical shaped morphology. The color change and spectral shift in absorption spectrum after addition of Fe2+ ion to AgNPs solution develop a simple and quick method for quantitative determination of Fe2+ from aqueous solution without any interference from excipients. The selective adsorption of Fe2+ ions over the nano particle surface and mechanism of binding was supported by Langmuir adsorption plot, zeta sizer and absorption titration results. The results suggest that the synthesized AgNPs to be used as an ideal, eco-friendly nano probe for selective and sensitive detection of Fe2+ ion in aqueous medium based on adsorption studies. The present method successfully applied for the quantitative analysis of Fe2+ ion in samples collected from local area having limit of detection 4.29 µg/mL. The method offers a simple, selective, economical approach for quantitative detection of Fe2+ in environmental samples without any pretreatment