Journal
TALANTA
Volume 200, Issue -, Pages 242-248Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2019.03.054
Keywords
2-Aminoanthracene; Ag@SiO2; Metal-enhanced fluorescence; Industrial wastewater
Categories
Funding
- National Natural Science Foundation of China [21673022, 21573024]
- Fundamental Research Funds for the Central Universities
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Due to severely overlapping emission and or/excitation spectra of polycyclic aromatic hydrocarbons (PAHs), the specifically recognizing PAHs by the fluorescent technique is still a challenge. Here, synthesized Ag@SiO2 nanoparticles with 40 +/- 4 nm Ag core and 7 +/- 1 nm SiO2 shell performing as a nanoprobe could selectively recognize 2-aminoanthracene (2-AA) via metal-enhanced fluorescence (MEF) within 2 min. The sensing mechanism was based on the facts: (1) there was a perfect spectral overlap between the local surface plasmon resonance (LSPR) peak of Ag@SiO2 and the absorptive peak of 2-AA, and (2) 2-AA could interact with Ag@SiO2 nanoparticles through hydrogen bonds between -NH2 in 2-AA and -OH in SiO2 shell. As a result, with Ag@SiO2 nanoparticles as a nanoprobe, a fluorescent assay for detecting 2-AA was developed with a linear range from 1 nM to 800 nM, which exhibited an excellent selectivity over possible PAHs, dyes and metal ions. The detection limit was 1 nM. Finally, the developed assay was applied to analyse 2-AA in industrial wastewater samples, which were highly consistent with that of high performance liquid chromatography (HPLC). This study presents a feasible assay for detecting 2-AA for environmental monitoring and toxic evaluating.
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