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Fluorescent carbon dot and its preparation method and application in detecting p-aminoazobenzene

A technology of p-aminoazobenzene and fluorescent carbon dots, which is applied in the direction of fluorescence/phosphorescence, chemical instruments and methods, nano-carbon, etc., can solve the problems of complex and toxic synthesis steps, and achieve low detection cost, high sensitivity and selectivity Good results

Active Publication Date: 2021-06-15
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, quantum dots have excellent optical properties: wide absorption spectrum, adjustable emission wavelength, good photostability, etc., but they are mostly made of semiconductor materials such as cadmium and antimony, which contain certain toxicity and complex synthesis steps

Method used

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  • Fluorescent carbon dot and its preparation method and application in detecting p-aminoazobenzene
  • Fluorescent carbon dot and its preparation method and application in detecting p-aminoazobenzene
  • Fluorescent carbon dot and its preparation method and application in detecting p-aminoazobenzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The preparation of embodiment 1 fluorescent carbon dots (CDs)

[0054] This embodiment provides a preparation method of fluorescent carbon dots (CDs), the schematic diagram is as follows figure 1 As shown, it specifically includes the following steps:

[0055] Maleic acid and melamine were used to prepare carbon dots by solid-phase synthesis. Specifically:

[0056] First, maleic acid and melamine in molar ratios of 1:1, 1:2, 2:1, 3:1, 1:3 were mixed and transferred separately into 50 mL autoclaves lined with Teflon , Heated at 200°C for 5h in a blast drying oven. After the reaction, it was naturally cooled to room temperature. Remove large particles by centrifugation (6500rpm, 10min), and filter the dark brown supernatant obtained by centrifugation with a 0.22 μm microporous membrane, then dialyze the filtrate with a dialysis bag (molecular weight cut-off: 500Da) for 24 hours, and collect the solution in the dialysis bag , and after drying in an oven, fluorescent c...

Embodiment 2

[0059] Embodiment 2: the method for laboratory simulation detection p-aminoazobenzene (PAAB) in environmental water

[0060] The fluorescent carbon dot (CDs) solution prepared in the above-mentioned embodiment 1 is added in the PAAB solution of different concentration, carries out fluorescence quenching reaction, schematic diagram is as follows figure 1 As shown, according to the linear relationship between the detected fluorescence intensity change and the concentration of p-aminoazobenzene, a standard curve was established;

[0061] Add the fluorescent carbon dot solution to the environmental water body to be tested for fluorescence quenching reaction to obtain the change of fluorescence intensity;

[0062] The concentration of p-aminoazobenzene in the environmental water body to be tested is calculated by the standard curve.

[0063] In this example, different carbon dot concentrations, reaction times and pH values ​​of the reaction system were studied to obtain the charac...

Embodiment 3

[0098] Example 3 Fluorescent carbon dots detect p-aminoazobenzene in actual water samples

[0099] To further investigate the high sensitivity and selectivity of this method for PAAB, the fluorescent carbon dots were evaluated using actual water samples. Four actual water samples taken from Yuyuantan Park, Binhe Park, Shichahai and Chaoyang Park. These actual water samples were first filtered using a 0.22 μm microporous membrane, and then the actual water samples were analyzed and the spike recovery was studied. The experimental results are shown in Table 1, and Table 1 is the experimental data after treatment of the actual water sample spiked.

[0100] Table 1:

[0101]

[0102] From the experimental results in Table 1, it can be seen that the standard addition recovery rate is 92.2% to 105.6%, and the relative standard deviation is between 1.38% and 4.27%, indicating that the fluorescent carbon dots can detect PAAB sensitively. It has certain application potential in d...

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Abstract

The invention provides a fluorescent carbon point, a preparation method thereof and an application in detecting p-aminoazobenzene. The preparation method of the fluorescent carbon dots comprises: mixing maleic acid and melamine to carry out solid phase heating reaction; after the reaction is finished, performing centrifugation, and the supernatant obtained by the centrifugation is filtered, dialyzed and dried to obtain the fluorescent carbon dots. The fluorescent carbon dot prepared by the present invention is used as a fluorescent carbon dot sensor to measure PAAB in water samples, and has the advantages of high sensitivity, strong stability, good selectivity, and low detection cost, and the linear detection concentration range for PAAB is 10-800ng / mL, the detection limit of PAAB is 6.642ng / mL, the selectivity of this fluorescent probe to PAAB is better than other types of azobenzene pollutants and metal ions, and the method is verified on 4 actual water samples , the standard addition recovery rate is 92.2% to 105.6%, and has a certain application prospect in the actual detection of the environmental field.

Description

technical field [0001] The invention belongs to the technical field of carbon quantum dots, and relates to a fluorescent carbon dot, a preparation method thereof and an application in detecting p-aminoazobenzene. Background technique [0002] Azo dyes are a class of dyes containing an azo structure, which are not easy to fade during rubbing or washing. Therefore, azo dyes are widely used as colorants in various fields such as textiles, printing, medicine, food, and cosmetics. Azo dyes are also highly toxic, mutagenic and carcinogenic, posing a serious threat to human health. [0003] p-Aminoazobenzene (p-aminoazobenzene, PAAB) is an azo dye that is carcinogenic in textiles and is widely used in the production of disperse dyes and acid dyes as an intermediate for the production of azo dyes. After PAAB is absorbed through the human skin, it may be decomposed due to the activation of the human body, thereby producing various harmful aromatic amines, which may transfer in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65C01B32/15G01N21/64B82Y40/00B82Y20/00
CPCB82Y20/00B82Y40/00C01P2004/04C01P2004/64C09K11/65C01B32/15G01N21/643G01N2021/6432
Inventor 周庆祥周宪琪
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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