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Method for degrading and detecting organophosphorus pesticide by using Fe-CDs and MOF-808 composite material

A technology of MOF-808 and organophosphorus pesticides, which is applied in the direction of material analysis, material separation, material excitation analysis, etc., can solve the problems of expensive instruments, application limitations, complicated pretreatment process, etc., and achieve the effect of rapid detection

Active Publication Date: 2021-12-03
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, organophosphate hydrolases are mainly used to degrade organophosphate compounds, but their preparation is difficult and their sources are limited, which limits their application
The methods used to detect organophosphorus compounds include mass spectrometry, high performance liquid chromatography-mass spectrometry and other methods. Although their sensitivity is high, due to the expensive equipment and the need for complex pretreatment processes, it cannot be achieved under conditions other than the laboratory. to test
In contrast, metal zirconium organic framework MOF-808 is favored by many people because of its easy-to-obtain raw materials and simple synthesis. It is often used as an artificial simulated enzyme to degrade organophosphorus pesticides. Unable to achieve integration of degradation and detection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 0.1175 g of 1,3,5-benzenetricarboxylic acid, 0.54 g of zirconium oxychloride octahydrate, N,N-dimethylformamide, and 25 mL of formic acid into a beaker and sonicate for 30 minutes, then add 2 mL of Fe- CDs, the solution in the beaker was transferred to a 100 mL polytetrafluoroethylene reactor, and placed in a 120 °C electric constant temperature drying oven to react for 48 hours. After the reaction, it was washed several times with DMF and acetone, and dried at 25 °C. Fe-CDs / MOF-808 can be prepared by activation in a vacuum oven at 120 ℃ for 12 h.

[0016] The prepared Fe-CDs / MOF-808 nanocomposite was formulated into a 1.2 mg / mL suspension and sonicated for 30 min. Add N-ethylmorpholine buffer solution (NEM), 100 μM paraoxon and 0.1-0.6 mg / mL of the above solution in sequence, and react with slight shaking on a shaker at room temperature for 5 minutes to measure the degradation and detection effect. When the concentration of Fe-CDs / MOF-80 is 0.3mg / mL, the degradat...

Embodiment 2

[0020] 50-200 mg of MOF-808 was added to 2 mL of Fe-CDs solution, and stirred on a magnetic stirrer at room temperature for 12 h to obtain Fe-CDs@MOF-808. Under the action of ultrasound and centrifugation, the precipitate was washed several times with DMF, deionized water, and acetone, and the synthesized material was activated in a vacuum oven at 120 °C for 12 h.

[0021] The prepared Fe-CDs@MOF-808 nanomaterials were prepared into a 1.2 mg / mL suspension and sonicated for 30 min, and N-ethylmorpholine buffer solution (NEM), 10 μM parathion and 0.5 mg / mL of the above solution, react under UV LED light for 10min at room temperature, and measure the degradation and detection effect. The concentration of Fe-CDs@MOF-808 suspension is 0.5 mg / mL, when the light is 10 min and the added MOF-808 is 50 mg, the degradation rate of parathion is 87%; the addition of MOF is 150 mg, the degradation rate is 100% And the fluorescence quenching effect is the strongest, the detection linear ra...

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Abstract

An organophosphorus compound degradation and detection integrated method based on an organic framework (MOF-808) composite material formed by Fe-doped carbon dots (Fe-CDs) and metal zirconium mainly comprises the following steps: forming an Fe-CDs / MOF-808 composite material with Fe-CDs embedded in pores of the MOF-808 and Fe-CDs@MOF-808 composite material with Fe-CDs attached to the surface of the MOF-808 in two modes. The two can degrade the organophosphorus compound to generate p-nitrophenol, fluorescence of Fe-CDs is quenched through the inner filtering effect, and degradation detection of the organophosphorus compound is achieved. The Fe-CDs / MOF-808 is characterized in that the MOF-808 catalyzes the hydrolysis of paraoxon under the condition of room temperature to generate p-nitrophenol; and the Fe-CDs@MOF-808 generates p-nitrophenol by photocatalytic degradation of parathion through generated <1> O2, .O2<-> and other active oxygen species under the illumination condition by utilizing the photosensitive oxidation performance of Fe-CDs. The method is high in organophosphorus pesticide degradation and detection speed, wide in detection linear range and low in detection limit, and can be applied to degradation and detection of organophosphorus compounds in actual water samples and fruit and vegetable samples.

Description

technical field [0001] The invention relates to a method for degrading and detecting organophosphorus pesticides by Fe-CDs and MOF-808 composite materials, belonging to the technical field of environmental protection. Background technique [0002] In recent years, organophosphorus compounds (OPs) have been widely used as pesticides, which will cause certain impacts on the environment during use. At the same time, a large amount of human exposure to organophosphorus pesticides can lead to acute myocardial injury, cognitive impairment and neuropsychiatric diseases. Therefore, it is necessary to develop methods for degrading and detecting organophosphorus compounds. At present, organophosphate hydrolases are mainly used to degrade organophosphate compounds, but their preparation is difficult and their sources are limited, which limits their application. The methods used to detect organophosphorus compounds include mass spectrometry, high performance liquid chromatography-mass...

Claims

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Application Information

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IPC IPC(8): C08G83/00C08K3/04C08L87/00G01N21/64G01N30/02
CPCC08G83/008C08K3/04G01N21/6428G01N30/02G01N2021/6432C08L87/00
Inventor 张信凤杨娇娇欧琪牟一敏马雪娟
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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