Abstract
A simple, rapid and sensitive colorimetric method was developed for the detection of Hg2+ ion in water samples using glutamine (Gln) and histidine (His) functionalized silver nanoparticles (Gln-His-Ag NPs) as a probe. The functionalized Ag NPs were confirmed by UV–vis, FT-IR and transmission electron microscopic (TEM) techniques, respectively. The Hg2+ ion was induced quickly the aggregation of Gln-His-Ag NPs, yielding a color change from yellow to orange, which can be readily seen by naked eye. The recognition mechanism is attributed to unique supramolecular nanostructures of Gln-His-Ag NPs, which yields strong interaction (cooperative metal-ligand interaction) between Gln-His-Ag NPs and Hg2+ ion. A linear correlation was obtained in the range of 100–1000μM with a detection limit of 25.48μM. However, the sensitivity of the probe was greatly improved by the addition of 0.2M NaCl as an ionic strength. The calibration graph was constructed between absorption ratio (A500/A402) and concentration of Hg2+ ion in the range of 1.0–500μM with the detection limit of 0.90μM, which is 28-times lower than the direct method (without NaCl). This method was successfully applied to detect Hg2+ ion in water samples. With the advantages of simplicity, selectivity and low sample volume, this method can potentially suitable for on-site monitoring of Hg2+ ion.
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