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Preparation method of ethylene diamine functionalized carbon quantum dot and application thereof in catechol detection

A technology of carbon quantum dots and quantum dots, which is used in the preparation of carbon nanomaterial fluorescent probes and the detection of organic pollutants to achieve high selectivity, anti-interference, high sensitivity and selectivity

Active Publication Date: 2021-01-22
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Carbon quantum dots have been used to detect a variety of metal ions and organic molecules by analyzing the changes in their fluorescence intensity, but there are few reports on the use of carbon quantum dots to analyze catechol

Method used

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  • Preparation method of ethylene diamine functionalized carbon quantum dot and application thereof in catechol detection
  • Preparation method of ethylene diamine functionalized carbon quantum dot and application thereof in catechol detection
  • Preparation method of ethylene diamine functionalized carbon quantum dot and application thereof in catechol detection

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preparation example Construction

[0036] (1) Preparation of ethylenediamine functionalized carbon quantum dots

[0037]Dissolve 0.65g of citric acid and 0.42g of urea in 25mL of ethylene glycol, stir magnetically for 2 hours, heat at 200°C for 10 hours, cool to room temperature, filter, dialyze, and freeze-dry to obtain carbon quantum dot powder. The carbon quantum dot powder of 20mg is added in the MES damping fluid (pH=6) of 20mL again, feed into nitrogen gas 30 minutes after ultrasonic dispersion 40 minutes to remove the dissolved oxygen in the solution, after this solution is placed in the ice bath container and Add 120mg 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 60mg hydroxysuccinimide successively, continue to maintain the nitrogen atmosphere and use a magnetic stirrer to stir at a constant speed for 12 hours to ensure the uniformity of the reaction. conduct. Add 250 μL of tert-butoxycarbonylethylenediamine under a nitrogen atmosphere at a low temperature of 0° C., and slowly add a...

Embodiment 1

[0041] Inject 1mL of ethylenediamine functionalized carbon quantum dot dispersion (0.1g / L) into a 10mL sample bottle, add 8mL of PBS buffer solution (0.01M, pH=7.4), inject 1mL of different concentrations of catechol solutions, After oscillating evenly, let it stand at room temperature for 30 minutes, and use a fluorescence spectrometer to perform a fluorescence test.

Embodiment 2

[0043] Inject 1mL of ethylenediamine functionalized carbon quantum dot dispersion (0.2g / L) into a 10mL sample bottle, add 8mL of PBS buffer solution (0.01M, pH=7.4), inject 1mL of different concentrations of catechol solutions, shake After uniformity, let it stand at room temperature for 30 minutes, and use a fluorescence spectrometer to perform a fluorescence test.

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Abstract

The invention provides a preparation method of an ethylene diamine functionalized carbon quantum dot and application thereof in catechol detection. Ethylene diamine is introduced to the surfaces of the carbon quantum dot through amidation reaction and a protection / de-protection method to synthesize the ethylene diamine functionalized carbon quantum dot, the preparation process is simple, the raw material source is wide, the price is low, and the obtained compound has a target detection substance selective binding function. In a neutral environment, catechol can quickly react with ethylene diamine on the surface of the ethylene diamine functionalized carbon quantum dot to generate a static compound, and the static compound causes synchronous quenching of nuclear-state and surface-state fluorescence of the ethylene diamine functionalized carbon quantum dot. The catechol concentration and the fluorescence quenching value of the ethylene diamine functionalized carbon quantum dot have a good linear relationship, and the detection limit reaches 0.07 mg / L. According to the invention, a simple and rapid catechol fluorescence quantitative analysis method is established, and has extremely high selectivity and interference resistance for catechol detection.

Description

technical field [0001] The invention belongs to the technical field of preparation of fluorescent probes of carbon nanomaterials and detection of organic pollutants, and in particular relates to a preparation method of ethylenediamine functionalized carbon quantum dots and its application in catechol detection. Background technique [0002] As an organic raw material, catechol is widely used in the production of pharmaceuticals, light stabilizers, pesticides, antioxidants, dyes, etc. In the process of production and application, it is easy to enter the environmental water body and cause serious harm to human health and ecological environment at very low concentrations. As isomers of catechol, resorcinol and hydroquinone have similar structures, and the three often coexist in water bodies. Therefore, it is of great practical significance to establish a highly selective detection method for the quantitative analysis of catechol. At present, a variety of analytical methods ha...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/65G01N21/64
CPCC09K11/025C09K11/65G01N21/643G01N2021/6432
Inventor 王薇杨磊丁石虎
Owner NANKAI UNIV
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