| Detection of Hg2+ in aqueous solutions based on surface plasmon resonance of silver nanoparticles |
| Paper ID : 1342-UFGNSM-FULL |
| Authors: |
|
Amirmostafa Amirjani *, Davoud Haghshenas Fatmehsari Amirkabir University of Technology, Hafez Ave., Tehran, Iran |
| Abstract: |
| Mercury as a crucial pollutant has drawn significant attention in recent research. Among the various detection methods, the methods based on surface-plasmon resonance (SPR) are quite attractive because of the high sensitivity. Direct SPR detection of Hg2+ was successfully carried out by employing the Ag nanoparticles (Ag NPs) capped by sodium citrate. The synthesized Ag NPs were characterized using ultraviolet spectroscopy (UV–Vis), scanning electron microscopy (SEM) and X-ray Diffraction (XRD). The as-synthesized Ag NPs were yellowish-brown in color due to the intense SPR absorption band. In the presence of Hg2+, the yellow Ag NPs solution was turned to a colorless solution, accompanying the broadening and blue shifting of SPR band. The UV-Vis spectra revealed the interaction between Hg2+ ions and the surface of Ag NPs only after 2 min. This interaction was further confirmed due to the reduction in the averages size and zeta potential of the Ag NPs. According to the obtained results, it was found that the interaction between Hg2+ and Ag NPs occur in a very short time, and the mercury/Ag shells were formed on the Ag NPs cores which results in the change of SPR and the adsorption behavior of Ag NPs. Moreover, the developed method exhibits a very high selectivity toward Hg2+ in a mixture of metallic ions. |
| Keywords: |
| Surface plasmon resonance, Silver nanoaprticles, mercury detection |
| Status : Paper Accepted (Oral Presentation) |
