研究目的
To develop a simple, rapid, and applicable method for the detection and monitoring of organophosphorus pesticides in water and soil samples using plasmon-active optical fibers functionalized with metal-organic frameworks (MOF-5).
研究成果
The developed plasmonic fiber sensor functionalized with MOF-5 offers a simple, sensitive, and cost-effective method for the detection and monitoring of organophosphorus pesticides in water and soil. The sensor's ability to selectively extract pesticides and induce measurable shifts in the plasmon absorption band enables detection at concentrations as low as 10^-12 M, making it comparable to conventional analytical methods. The system's applicability to complex samples without pretreatment highlights its potential for environmental monitoring.
研究不足
The study demonstrates the sensor's effectiveness in controlled environments but may face challenges in real-world applications due to potential interference from other compounds in complex samples. The time required for saturation at lower pesticide concentrations could limit rapid field applications.
1：Experimental Design and Method Selection:
The study utilized plasmon-active optical fibers functionalized with MOF-5 for the selective extraction and detection of organophosphorus pesticides. The methodology involved the deposition of a thin gold layer on the optical fiber core to induce plasmon absorption, followed by the growth of MOF-5 on the gold surface for selective pesticide extraction.
2：Sample Selection and Data Sources:
Model solutions of organophosphorus pesticides (fenitrothion and paraoxon) in water and simulated soil samples were used to test the sensor's performance.
3：List of Experimental Equipment and Materials:
Multimode plastic-clad silica optical fibers, gold for sputtering, MOF-5 for coating, and pesticides for testing.
4：Experimental Procedures and Operational Workflow:
The optical fiber core was exposed, coated with gold, and then functionalized with MOF-5. The sensor was then exposed to pesticide solutions or soil samples, and the shift in plasmon absorption band was measured.
5：The sensor was then exposed to pesticide solutions or soil samples, and the shift in plasmon absorption band was measured.
Data Analysis Methods:
5. Data Analysis Methods: Raman spectroscopy, XPS, XRD, and ellipsometry were used to confirm MOF-5 growth and pesticide entrapment. The shift in plasmon absorption band was analyzed to determine pesticide concentration.
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