研究目的
To develop a sensitive method for detecting picric acid (PA) based on the phosphorescence quenching of melamine-passivated Mn-doped ZnS quantum dots (QDs).
研究成果
A sensitive and selective method for detecting PA was developed using MA-passivated Mn-doped ZnS QDs. The method is based on the phosphorescence quenching principle and has a detection limit of 1.4 ng mL–1. The static quenching mechanism was confirmed by density functional theory, showing a stable structure formation between MA and PA with a binding energy of 12.43 eV.
研究不足
The method may be affected by the presence of certain metal ions (e.g., Hg2+ and Fe3+) that can interfere with the detection of PA. The stability of the QDs in water dispersion is limited to three days.
1：Experimental Design and Method Selection
A hydrothermal method was used to synthesize MA-passivated Mn-doped ZnS QDs. The phosphorescence quenching behavior of PA on these QDs was examined to establish a detection method.
2：Sample Selection and Data Sources
Environmental water samples (lake water and river water) were collected and analyzed for PA content.
3：List of Experimental Equipment and Materials
ZnSO4·7H2O, Na2S·9H2O, MnCl2, melamine, picric acid, and other chemicals were used. Instruments included a transmission electron microscope, atomic force microscope, X-ray diffraction pattern, laser particle size analyzer, ultraviolet visible spectrophotometer, and fluorescence spectrophotometer.
4：Experimental Procedures and Operational Workflow
The synthesis of QDs, preparation of samples, and phosphorescence measurements were conducted under controlled conditions. The interaction between MA-passivated QDs and PA was studied at 80 °C.
5：Data Analysis Methods
The phosphorescence quenching data were analyzed to establish a linear relationship between PA concentration and quenching intensity. Density functional theory was used to verify the static quenching mechanism.
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transmission electron microscope
Tecnai G2 F20
FEI
Microstructure characterization of QDs
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X-ray diffraction pattern
D8 ADVANCE
Bruker
Crystal structure analysis of QDs
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laser particle size analyzer
Zetasizer Nano ZS
Malvern
Particle size distribution analysis
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ultraviolet visible spectrophotometer
UV-3600
Shimadzu
Absorption spectroscopy
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atomic force microscope
SPA400
Seiko
Surface analysis of QDs
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fluorescence spectrophotometer
Eclipse
Varian
Phosphorescence measurement
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