研究目的
Developing a highly sensitive and ultrafast fluorescent sensor for the visual detection of 2,4,6-trinitrophenol (TNP) in aqueous media.
研究成果
The developed QDs-PEI/PA6 fluorescent film sensor demonstrates high sensitivity, selectivity, and rapid response towards TNP in aqueous solutions, enabling visual detection at concentrations as low as 100 ng/mL with a thirty-second response time. The sensor's performance is attributed to the effective reaction between QDs-PEI and TNP, facilitated by the high hydrophilicity and porosity of the PA6 nanofiber membranes. This sensor holds significant potential for real-time and visual detection of TNP in environmental and analytical applications.
研究不足
The study focuses on the detection of TNP in aqueous solutions, and the performance in other media or under different environmental conditions is not explored. The sensor's stability over extended periods and under varying pH conditions is mentioned but not extensively studied.
1：Experimental Design and Method Selection:
The study involves the synthesis of CdSe/CdxZn1-xS quantum dots (QDs) and their modification with polyethyleneimine (PEI) for enhanced water solubility and functionality. The QDs-PEI are then integrated into polyamide 6 (PA6) nanofiber membranes via electrospinning to create a fluorescent film sensor.
2：Sample Selection and Data Sources:
The sensing performance is evaluated using aqueous solutions of TNP and other nitroaromatic compounds.
3：List of Experimental Equipment and Materials:
Includes CdO, ZnAc, sulfur, TOP, OA, ODE, SA, PEI, PA6, formic acid, chloroform, and various nitroaromatic compounds. Instruments used include TEM, SEM, FTIR spectrometer, spectrofluorimeter, UV-vis spectrometer, and wetting angle measurer.
4：Experimental Procedures and Operational Workflow:
The synthesis of QDs, their modification with PEI, preparation of QDs-PEI/PA6 nanofiber films via electrospinning, and fluorescence response measurements towards TNP and other nitroaromatic compounds.
5：Data Analysis Methods:
Fluorescence quenching efficiency is analyzed using the Stern-Volmer equation to evaluate the sensitivity and selectivity of the sensor towards TNP.
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