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A Schiff base functionalized graphene quantum dot composite fluorescent probe and its application

A technology of graphene quantum dots and composite fluorescence, applied in the field of fluorescent probes and its applications, can solve the problems of inability to meet on-site monitoring, lack of selectivity in detection, lack of portability, etc., and achieve rapid detection, controllable form, and low cost Effect

Active Publication Date: 2022-06-28
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the means of detection of nitroaromatic explosives, such as gas chromatography, mass spectrometry, ion mobility spectrometry, Raman spectrometry, fluorescence spectrometry, X-ray imaging, electrochemical analysis, etc.; although these methods can achieve For the detection of nitroaromatic explosives, there are often problems such as lack of portability, complicated pretreatment, need for precision instrument operation, lack of selectivity in detection, and inability to meet on-site monitoring.

Method used

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  • A Schiff base functionalized graphene quantum dot composite fluorescent probe and its application
  • A Schiff base functionalized graphene quantum dot composite fluorescent probe and its application
  • A Schiff base functionalized graphene quantum dot composite fluorescent probe and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0036] This example is used to prepare Schiff base functionalized graphene quantum dot composite probes (Schiff-GQDs).

[0037] This embodiment is divided into three steps:

[0038] Step 1: Schiff base reaction between N-GQDs and TPA-T-CHO

[0039] Dissolve N-GQDs (10 mg) and TPA-T-CHO (72.1 mg) in an appropriate amount of anhydrous ethanol (30 mL in total). Since N-GQDs are slightly soluble in anhydrous ethanol, ultrasonically disperse them, and then disperse the two. Mix them and put them in a flask, add 3 drops of glacial acetic acid (0.15mL) dropwise as a catalyst, measure pH=6, add an appropriate amount of anhydrous sodium sulfate to remove water, heat to reflux (110°C) under argon atmosphere, react for 16h, while Hot filtration to remove sodium sulfate, cooling and standing overnight, precipitation in an ice bath, filtration, and recrystallization from absolute ethanol to obtain Schiff base-functionalized graphene quantum dots (Schiff-GQDs).

[0040] Wherein, the react...

Embodiment 2

[0045] This embodiment is divided into four steps:

[0046] Step 1: Configure the concentration to be 2.5×10 -4 mol / L 2,4,6-trinitrophenol (PA) solution, the solvent is absolute ethanol.

[0047] Step 2: Dissolve the Schiff base-functionalized graphene quantum dot composite probe (Schiff-GQDs) prepared in Example 1 in absolute ethanol, ultrasonicate for 30 minutes, and prepare a solution with a mass concentration of 0.025 mg / mL .

[0048] Step 3: Pipette 2.50 mL of the Schiff-GQDs solution prepared in Step 2 into a quartz cuvette, shake and shake well. The quartz cuvette was placed in a fluorescence spectrometer (excitation wavelength 380 nm) to scan the fluorescence spectrum of the sample.

[0049] Step 4: Add 50 μL of the 2,4,6-trinitrophenol solution prepared in Step 1 to the cuvette, shake the cuvette to make it uniform, and scan the fluorescence spectrum of the sample.

[0050] This process was then repeated, and as the amount of 2,4,6-trinitrophenol added continued t...

Embodiment 3

[0053] This example is used to prepare a fiber test paper fluorescence sensor.

[0054] This embodiment is divided into five steps:

[0055] Step 1: Dissolve the Schiff base-functionalized graphene quantum dot composite probe (Schiff-GQDs) prepared in Example 1 in absolute ethanol, and sonicate for 30 minutes to prepare a solution with a mass concentration of 1 mg / mL.

[0056] Step 2: Configure the concentration to 10 respectively -4 mol / L of nitrobenzene solution, o-nitrotoluene solution, p-nitrotoluene solution, m-nitrotoluene solution, 2,6-dinitrotoluene solution and the concentration of 4.4×10 -4 mol / L 2,4,6-trinitrophenol solution, the solvent is absolute ethanol.

[0057] Step 3: Soak the 1cm×1cm test paper in the solution described in step 1 for 24 hours, pick it up and dry it, and take 50 μL of the nitrobenzene solution, o-nitrotoluene solution, and p-nitrotoluene solution described in step 2, respectively , m-nitrotoluene solution, 2,6-dinitrotoluene solution and 2...

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Abstract

The invention discloses a Schiff base functionalized graphene quantum dot composite fluorescent probe (Schiff-GQDs) and its application, the composite fluorescent probe is an aminated graphene quantum dot (N-GQDs) and 5-(4 ‑(Diphenylamino)phenyl)thiophene‑2‑formaldehyde (TPA‑T‑CHO) cross-linked. The composite fluorescent probe was prepared as a fluorescent chemical sensor for the detection of nitroaromatic explosives, which improved the non-luminescent characteristics of aminated graphene quantum dot solids, and successfully realized the sensitivity and visualization of nitroaromatic explosives It provides a reliable detection method for fast, cheap, accurate and visual detection of nitro explosives content.

Description

technical field [0001] The invention relates to a fluorescent probe and its application, in particular to a graphene quantum dot composite fluorescent probe and its application. Background technique [0002] At present, almost all explosives contain 2,4,6-trinitrotoluene (TNT), 2,4-dinitrotoluene (2,4-DNT), 2,4,6-trinitrophenol ( PA) and other nitroaromatic compounds. Such compounds, such as exposure to nitroaromatics, can cause many health problems; in environmental monitoring, highly sensitive detection of nitroaromatics in soil and groundwater is also a key issue to be solved. Therefore, it is particularly important to research and develop ultra-sensitive identification and detection of nitroaromatic explosives. [0003] For the detection of nitroaromatic explosives, such as gas chromatography, mass spectrometry, ion mobility spectroscopy, Raman spectroscopy, fluorescence spectroscopy, X-ray imaging, electrochemical analysis, etc.; although these methods can be achieved...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64
CPCG01N21/64
Inventor 陶涛范雨亭王慧君余亭希宋洋詹雪吕帅董晓臣
Owner NANJING UNIV OF INFORMATION SCI & TECH