Eu-Doped MOF-based high-efficiency fluorescent sensor for detecting 2,4-dinitrophenol and 2,4,6-trinitrophenol...

Area of Science:

• Materials Science
• Analytical Chemistry
• Environmental Science

Background:

• Nitroaromatic explosives present significant environmental and safety risks.
• Developing sensors for simultaneous detection of multiple nitroaromatic explosives is challenging.
• Existing sensors often lack the ability to differentiate and quantify complex mixtures.

Purpose of the Study:

• To synthesize a novel hybrid material for sensitive and selective detection of nitroaromatic explosives.
• To enable the simultaneous discrimination and quantification of multiple nitroaromatic compounds.
• To address the limitations of current sensors in multicomponent explosive detection.

Main Methods:

• Post-synthetic modification was employed to synthesize Eu-functionalized MOF-253 (Eu@MOF-253).
• Fluorescence spectroscopy was used to analyze the sensor's response to nitroaromatic explosives.
• UV-vis absorption spectra were compared with sensor emission and excitation spectra for detection mechanism analysis.

Main Results:

• Eu@MOF-253 exhibited red-shifted fluorescence peaks in the presence of 2,4-dinitrophenol (2,4-DNP).
• The sensor showed overlapping spectra with 2,4-dinitrophenol (2,4-DNP) and 2,4,6-trinitrophenol (TNP), enabling simultaneous detection.
• High sensitivity was achieved with low limits of detection (approx. 10 nM) for both analytes and a high quenching constant (Ksv = 1.58 × 10^6) for TNP.

Conclusions:

• Eu@MOF-253 is a highly sensitive and selective luminescent sensor for simultaneous determination of TNP and 2,4-DNP.
• The sensor's mechanism involves internal filtration effect (IFE) and electron transfer.
• This provides a practical and efficient method for detecting nitroaromatic explosives in complex mixtures.