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Preparation method and application of fluorescent nanofiber film based on bimetallic organic framework

A technology of fluorescent nanofibers and organic frameworks, which is applied in the field of preparation of fluorescent nanofiber membranes, can solve the problems of separation and recycling of difficult MOF powders and analyte solutions, time-consuming, etc., and achieve multiple repeatable detection and good selectivity , to achieve the effect of economic applicability

Active Publication Date: 2019-02-26
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems with MOF chemical sensors, for example, making MOF powder into suspension is a time-consuming process, and it is difficult to separate MOF powder from analyte solution for recycling.

Method used

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  • Preparation method and application of fluorescent nanofiber film based on bimetallic organic framework
  • Preparation method and application of fluorescent nanofiber film based on bimetallic organic framework
  • Preparation method and application of fluorescent nanofiber film based on bimetallic organic framework

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of Fluorescent Nanofiber Membrane

[0039] The preparation method is as follows:

[0040] Step 1: Preparation of bimetallic organic framework

[0041] 51mg 4,4', 4", 4"'-(ethylene-1,1,2,2-tetrayl)tetrakis-([1,1'-biphenyl]-4-carboxylic acid) was added to 30mL DMF : EtOH (v / v, 1:2) in the autoclave, sonicated for 5 minutes to dissolve it. Add ZrCl 4 (120mg, 0.52mmol) and ZnCl 2 (70mg, 0.52mmol) into the autoclave. Then, the autoclave was placed at 120°C for 48 hours. After the reaction, the autoclave was taken out and cooled to room temperature. The product was washed three times with DMF:EtOH (v / v, 1:2), and dried under vacuum at 60°C overnight. That is, a bimetallic organic framework is obtained.

[0042] Step 2: Prepare electrospinning solution

[0043] Disperse the BiMOF (4mg) into 3mL DMF:CHCl 3 (v / v: 1:1), sonicate for 30 minutes. Then, 0.92g PMMA was added in the above-mentioned mixture solution and magnetically stirred for 12 hours, and the so...

Embodiment 2

[0046] Fluorescence Nanofiber Membrane Performance Test

[0047] Morphology analysis: The morphology of the fiber membrane was observed using a scanning electron microscope (SEM). figure 2 The scanning results are shown, and it can be seen from the figure that the nanofibers have a smooth shape, and the diameter is about 0.7-1.6um.

[0048] Optical performance characterization: The optical performance of the fluorescent nanofiber membrane was characterized by a fluorescence spectrophotometer. image 3 The characterization results are shown: the excitation wavelength of the fluorescent nanofiber film is 373 nm, and the emission wavelength is 530 nm.

Embodiment 3

[0050] Sensitivity test of fluorescent nanofibrous membranes to TNP, 4-NA, NFT and NFZ

[0051] testing method:

[0052] (1) The fluorescent nanofiber membrane is placed in aqueous solutions containing different concentrations of TNP, 4-NA, NFT and NFZ for detection;

[0053] (2) Fluorescent nanofiber membranes were placed in TNP, 4-NA, NFT and NFZ aqueous solutions containing 0, 10, 20, 30, 40, 50, 60, 80, 100, 120, 140, 160uM for fluorescence testing ;

[0054] (3) The quenching effect of TNP, 4-NA, NFT and NFZ on the fluorescent nanofiber membrane was explained by the Stern-Volmer equation, and the Stern-Volmer constant was obtained.

[0055] Result analysis:

[0056] Figure 4 The fluorescence emission spectra of fluorescent nanofiber membranes with the concentration of quencher are given. It can be seen from the figure that as the concentration of the quencher increases, the fluorescence intensity decreases gradually, and the detection limits for TNP, 4-NA, NFT and N...

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Abstract

The invention discloses a preparation method and application of a fluorescent nanofiber film based on a bimetallic organic framework. The fluorescent nanofiber film is prepared by taking the bimetallic organic framework and a PMMA polymer as raw materials and utilizing an electrostatic spinning technology. The purpose of detection is achieved through the quenching amount of the fluorescent signalof the fluorescent nanofiber film. The fluorescent nanofiber film has the unique advantages of high sensitivity, good selectivity, short response time and the like when used for detecting nitro-explosive { (4-NA (p-nitroaniline), TNP (picric acid) } and antibiotic { (NFT nitrofurantoin, NFZ nitrofurazone) } in water.

Description

technical field [0001] The invention belongs to the field of macromolecule and spinning, and in particular relates to a preparation method and application of a fluorescent nanofiber membrane based on a bimetallic organic framework. Background technique [0002] With the proposal of the Healthy China strategy, the issue of water quality safety has been highly valued. The abuse of explosives in industry and the indiscriminate discharge of antibiotics in clinical use have resulted in the contamination of environmental water samples. Explosives bring huge hidden dangers to the environment and human beings. TNP (2,4,6-trinitrophenol) and 4-NA (4-nitroaniline) are listed as hazardous substances in groundwater and soil due to their strong explosiveness. serious pollution source. Nitrofuran antibiotics (NFT nitrofurantoin and NFZ nitrofuran) are widely used in animals to prevent intestinal bacterial infection, and residual antibiotics in the environment may develop resistance to n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D01D5/00D01F6/52D01F1/10C08G83/00G01N21/64
CPCC08G83/008D01D5/0015D01F1/10D01F6/52D04H1/728G01N21/643G01N2021/6432
Inventor 肖玉秀吴笛郑曲通
Owner WUHAN UNIV
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