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Modified g-C3N4@MOF fluorescent composite material as well as preparation method and application thereof

A composite material, g-c3n4 technology, applied in the application of detecting antibiotics and the preparation of modified g-C3N4@MOF fluorescent composite materials, can solve the problems of being easily disturbed by environmental factors, high cost, low detection sensitivity, etc. Effects of suppressing aggregation and non-radiative energy dissipation, improving optical properties, and increasing specific surface area

Active Publication Date: 2022-01-14
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Long-term use can easily damage kidney function and nervous system, and cause sulfa drug poisoning
[0006] At present, instrument detection and kit detection are commonly used for the detection of antibiotics. The former detection steps are cumbersome, the cost is too high, and it takes a long time. The latter detection sensitivity is low and is easily interfered by environmental factors.

Method used

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  • Modified g-C3N4@MOF fluorescent composite material as well as preparation method and application thereof
  • Modified g-C3N4@MOF fluorescent composite material as well as preparation method and application thereof
  • Modified g-C3N4@MOF fluorescent composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Preparation of g-C 3 N 4 -O solution: Weigh 5g of oxalic acid and 13g of urea and mix them in a beaker, add 25mL of deionized water, stir evenly, continue stirring in a constant temperature water bath at 60°C, and adjust the temperature to 70°C after crystallization and stir until evaporated to dryness. The powder obtained by evaporating to dryness was placed in a ceramic crucible and the temperature was raised to 550 °C and kept for 300 min. Take it out after cooling down to room temperature, wash and dry to obtain g-C 3 N 4 -O powder.

[0049] Weigh 0.6g of g-C 3 N 4 -O powder was placed in a round-bottomed flask, then 7mL of 98% sulfuric acid was added to it, mixed evenly, stirred at 85°C and 900rpm for 1h, the resulting sol was added to 85mL of water, and 8g of ammonium chloride was added, stirred for 2h, centrifuged Take the supernatant to get g-C 3 N 4 -O solution.

[0050] (2) g-C required for the preparation of the experimental system 3 N 4 -O mot...

Embodiment 2

[0055] Graphite carbon nitride has better optical properties after being modified by oxygen doping, and when it is compounded with MAF-7, the optical properties are further improved. Optimal oxygen doping ratio.

[0056] Method: Burn oxalic acid and urea at different mass ratios of 0:24, 2.4:24, 4.8:24, and 10.8:24 to burn carbon nitride block materials, and obtain the corresponding 0% g-C 3 N 4 -O, 10% g-C 3 N 4 -O, 20% g-C 3 N 4 -O and 45% g-C 3 N 4 -O, the same steps as in Example 1, the above-mentioned different proportions of oxygen-doped carbon nitride are used as precursors to combine with metal centers and organic ligands to obtain corresponding composite materials: 0% g-C 3 N 4 -O@M7, 10% g-C 3 N 4 -O@M7, 20% g-C 3 N 4 -O@M7 and 45% g-C 3 N 4 -O@M7, using transient fluorescence to measure the absolute fluorescence quantum yield of composite materials with different oxygen doping ratios.

[0057] Result: According to image 3 The number of emitted photo...

Embodiment 3

[0059] g-C in the present invention 3 N 4 After the actual measurement of the -O@M7 composite material with a fluorescence spectrophotometer, it is determined that the excitation wavelength is 255nm and the emission spectrum is in the range of 320-480nm.

[0060] Different kinds of antibiotics are to g-C in the present invention 3 N 4 -O@M7 composites have different fluorescence response effects, and some antibiotics such as sulfonamides and quinolones can effectively quench g-C 3 N 4 The fluorescence intensity of -O@M7 composites, some antibiotics such as aminoglycosides can effectively enhance the g-C 3 N 4 The fluorescence intensity of the -O@M7 composite, amide alcohols and tetracyclines also contribute to the g-C 3 N4 -O@M7 composites have an effect on the fluorescence response.

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Abstract

The invention discloses a modified g-C3N4@MOF fluorescent composite material as well as a preparation method and application thereof. The modified g-C3N4@MOF is g-C3N4-O@MOF, and the g-C3N4-O@MOF fluorescent composite material is synthesized from oxygen-doped graphite phase carbon nitride g-C3N4-O, metal central ions and organic ligands in situ. A fluorescent sensor constructed on the basis of the modified g-C3N4-O@MOF fluorescent composite material does not need any chemical mark and addition of fluorescent dye, is simple and convenient to operate, has very high sensitivity, repeatability and stability, can realize specific detection in a complex sample, has good economic and practical values, and is expected to be applied to detection of antibiotics in medical treatment, environment, food and livestock breeding industry.

Description

technical field [0001] The present invention relates to fluorescent composite material and its preparation method and application, in particular to modified g-C 3 N 4 The preparation method of @MOF fluorescent composite material and its application to detect antibiotics. Background technique [0002] Graphite carbon nitride (g-C 3 N 4 ) have excellent physical structures, low toxicity, and luminescent properties, and are widely used in sensing, bioimaging, and photocatalysis. However, its luminescent properties have the disadvantages of poor aqueous photoluminescence quantum yield, easy aggregation and agglomeration in solution. In addition, g-C 3 N 4 The aqueous stability, dispersibility, and photophysical properties of ions largely depend on their surface states and environments. Therefore, in order to better improve g-C 3 N 4 Its applicability can be compounded with other materials to make up for defects. [0003] Metal-organic framework compounds refer to inorga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06C09K11/65C08G83/00C08K3/28G01N21/64
CPCC09K11/06C09K11/65C09K11/0883C08G83/008C08K3/28G01N21/6428G01N21/643G01N2021/6432C09K2211/188C09K2211/1466Y02A50/30
Inventor 林蕾张幸李昺之林潇王秋苏
Owner NANJING NORMAL UNIVERSITY
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