Article ID Journal Published Year Pages File Type
7682908 Talanta 2013 6 Pages PDF
Abstract
Composite nanospheres containing dithizone, luminescent LaVO4:Eu3+ nanoparticles (NPs), and amphiphilic polymer have been composed for the rapid, selective, and visual luminescence turn-on detection of mercury ions (Hg2+) in water. Due to the absorption of dithizone, the strong red luminescence of LaVO4:Eu3+ NPs encapsulated in nanospheres was quenched noticeably. As a result, these as-prepared nanocomposites (NCs) demonstrate very weak red luminescence. However, in the presence of Hg2+, the red luminescence of nanocomposites was turned on dramatically, which can be attributed to the strong binding of mercury (II) ions by dithizone and forming a complex without absorption in the red emission range. Meanwhile, other cations have no influence on the detection of Hg2+, suggesting a good selectivity for Hg2+ sensing. Due to the high photostability and chemical stability of the nanocomposites, operation simplicity, low cost, and good selectivity, this newly developed method is highly desirable for field assay of Hg2+ in aqueous media ranging from 40.0 nM to 4.0 μM with a limit of detection of 32.0 nM and a good linearity (r=0.9980). Therefore, a facile, rapid, selective, and visual luminescence turn-on technology has been successfully developed for Hg2+ detection.
Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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