Detection of Lead Contamination in Water using Fluorescence of Functionalized Gold Nanoparticles
AbstractThe primary focus of this study was to determine whether gold nanoparticles (GNPs) coated with 11-mercaptoundecanoic acid (MUA) would exhibit a fluorescent response upon the addition of lead contaminated water. Different concentrations of both MUA-GNPs and Pb2+ exhibited fluorescent responses of varying types, indicating that inter-particle distance after the addition of the lead may be dependent on the lead concentration. Both fluorescent enhancement and quenching behavior were noted. The maps of fluorescent response were generated using excitation emission matrix spectroscopy. The data were corrected for inner filtering and water Raman effects. These fluorescent responses, if optimized, could be used to create a nanoparticle-embedded membrane, housed in a water filter with a clear window, enabling residential consumers to immediately detect by eye the presence of lead in their drinking water using a simple handheld UV flashlight.
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