Sugar-Reduced Gelatin-Capped Silver Nanoparticles with High Selectivity for Colorimetric Sensing of Hg2+ and Fe2+ Ions in the Midst of Other Metal Ions in Aqueous Solutions.

摘要

Green synthesized dextrose and maltose-reduced silver nanoparticles (Ag-NPs) were investigated forcolorimetric sensing of metal ions at different concentrations and reaction time. The synthesized Ag- NPs were characterized using UV-Visible spectroscopy (UV-Vis), Fourier transform Infra-redspectroscopy (FTIR), transmission electron microscopy (TEM) and dynamic light scattering (DLS).2+ 2+Both maltose and dextrose-reduced Ag-NPs were highly sensitive and selective to Hg and Fe ionsover other metal ions at higher metal ion concentration. This was accompanied with a colour change2+ 2+ from yellowish solution to colourless for Hg ions and from yellowish solution to greenish for Feions. Our findings also showed that dextrose-reduced Ag-NPs resulted in better colorimetric sensing ofmetal ions than maltose-reduced Ag-NPs. Both Ag-NPs solutions were highly sensitive and selective2+ 12 2towards Hg ions at lower concentration up to 10- M with a linear regression coefficient value (R )of 0.9792 and 0.9740 for maltose and dextrose reduced Ag-NPs respectively. The study on variation ofreaction time showed that the sensing reaction can be carried out within a short reaction time of 30 s.