Li G, Lu M, Li S, Yang M, Zhang Y, Zhang Y, Wang H, Yang W. A novel fluorescent "OFF-ON" sensing strategy for Hg (II) in water based on functionalized gold nanoparticles.
CHEMOSPHERE 2022;
303:135174. [PMID:
35649443 DOI:
10.1016/j.chemosphere.2022.135174]
[Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 05/23/2022] [Accepted: 05/27/2022] [Indexed: 06/15/2023]
Abstract
Mercury ion (Hg2+) is a heavy metal pollutant that can affect the safety of water environment and endanger human health. A novel detection strategy (GNPs-L-Cys-Rh6G2) for Hg2+ based on a fluorescence "OFF-ON" was proposed. Gold nanoparticles (GNPs) were assembled with l-cysteine (L-Cys), which was used as a "bridge" to link with rhodamine 6G derivatives (Rh6G2). The fluorescence state transition of GNPs-L-Cys-Rh6G2 switching from "OFF"-"ON" was observed because Hg2+ opened the spirolactam ring through a catalytic hydrolysis mechanism. The fluorescence signal of the GNPs-L-Cys-Rh6G2 system mixed with Hg2+ in the concentration range of 10-100 μM was analyzed and determined with a limit of detection (LOD) of 2 μM (S/N = 3). Moreover, the spiked Hg2+ concentration in real water samples were successfully quantified by GNPs-L-Cys-Rh6G2, which was in line with the ideal average recovery rate and relative standard deviation. The proposed strategy exhibited high specificity, sensitivity and stability, providing a novel sensing platform for heavy metal ions detection in water environment.
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