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Nitrogen-doped fluorescent carbon dot based on citric acid and benzoylurea as well as preparation method and application thereof

A technology of benzoyl urea and fluorescent carbon dots, applied in the field of fluorescent sensing, can solve the problem of few fluorescent CDs and achieve excellent sensitivity, rich functional groups, and strong selectivity

Active Publication Date: 2021-01-22
XIHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still few patents on fluorescent CDs for Fe(III) selective sensing

Method used

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  • Nitrogen-doped fluorescent carbon dot based on citric acid and benzoylurea as well as preparation method and application thereof
  • Nitrogen-doped fluorescent carbon dot based on citric acid and benzoylurea as well as preparation method and application thereof
  • Nitrogen-doped fluorescent carbon dot based on citric acid and benzoylurea as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment one: a kind of N-CDs (nitrogen-doped fluorescent carbon point), its preparation method comprises the steps:

[0034] 1) Grind and mix 0.5g of citric acid and 2g of benzoylurea into a polyphenol tank, mix on a shaker for 2 minutes, transfer the polyphenol tube into a stainless steel jacket, and react at 180°C for 6 hours;

[0035] 2) After cooling the reactant obtained in step 1) to room temperature, pour 10 mL of ultrapure water into it, and after ultrasonic treatment for 30 minutes, stir for 1 hour to fully dissolve N-CDs in high-purity water;

[0036] 3) Filter the aqueous solution obtained in step 2) under reduced pressure to remove insoluble solids, transfer the filtrate to an activated dialysis bag with a molecular weight cut-off of 8000, and dialyze at room temperature for 120 hours; after that, transfer the N-CDs aqueous solution to a small beaker , freeze-dried for 48 hours to obtain the N-CDs (yellow powder).

[0037] figure 1 This is the transmissio...

Embodiment 2

[0040] Embodiment 2: A kind of N-CDs provided by the present invention, its preparation method comprises the following steps:

[0041] 1) Grind and mix 2g of citric acid and 6g of benzoylurea into a polyphenol tank, mix on a shaker for 2 minutes, transfer the polyphenol tube into a stainless steel jacket, and react at 240°C for 10 hours;

[0042] 2) After cooling the reactant obtained in step 1) to room temperature, pour 10 mL of ultrapure water into it, and after ultrasonic treatment for 30 minutes, stir for 1 hour to fully dissolve N-CDs in high-purity water;

[0043] 3) Filter the aqueous solution obtained in step 2) under reduced pressure to remove insoluble solids, transfer the filtrate to an activated dialysis bag with a molecular weight cut-off of 3500, and dialyze at room temperature for 240 hours; after that, transfer the N-CDs aqueous solution to a small beaker , freeze-dried for 48 hours to obtain the N-CDs (brown powder).

Embodiment 3

[0062] Embodiment 3: A kind of N-CDs provided by the present invention, its preparation method comprises the following steps:

[0063] 1) Grind and mix 6g of citric acid and 1g of benzoylurea into a polyphenol tank, mix on a shaker for 2 minutes, transfer the polyphenol tube into a stainless steel jacket, and react at 60°C for 24 hours;

[0064] 2) After cooling the reactant obtained in step 1) to room temperature, pour 10 mL of ultrapure water into it, and after ultrasonic treatment for 30 minutes, stir for 1 hour to fully dissolve N-CDs in high-purity water;

[0065] 3) Filter the aqueous solution obtained in step 2) under reduced pressure to remove insoluble solids, transfer the filtrate to an activated dialysis bag with a molecular weight cut-off of 14,000, and dialyze at room temperature for 6 hours; after that, transfer the N-CDs aqueous solution to a small beaker , freeze-dried for 48 hours to obtain the N-CDs.

[0066] The present invention also discloses that it can ...

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Abstract

The invention discloses a nitrogen-doped fluorescent carbon dot based on citric acid and benzoylurea, which is prepared from citric acid and benzoylurea as raw materials, and a preparation method comprises the following steps: (1) mixing citric acid and benzoylurea, and carrying out high-temperature solid-phase preparation; (2) sequentially cooling, dissolving and filtering reactants obtained in the step (1); and (3) dialyzing the filtrate obtained in the step (2), and freeze-drying to obtain the nitrogen-doped fluorescent carbon dots. The application is as follows: the carbon dot is used forpreparing a fluorescence sensor for detecting Fe (III). The preparation and post-treatment method has the advantages that the operation is simple, the surface of the obtained carbon dot is rich in amino and hydroxyl, the carbon dot is soluble in water, the fluorescence quantum yield is high, and the carbon dot has a selective sensing effect on Fe (III) in an aqueous solution and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of fluorescent sensing, in particular to a nitrogen-doped fluorescent carbon dot based on citric acid and benzoylurea, a preparation method and application thereof. Background technique [0002] Iron is one of the most abundant metal elements on earth and the most abundant and important trace element in the human body, mainly because iron plays an important role in many processes. Ferric ion [Fe(III)] plays an important role in both the ecological environment and the organism. In environmental quality assessment, Fe(III) content is one of the important indicators for judging water quality grades. In the physiological activities of living organisms, Fe(III) also has a great influence, and its deficiency or excess will lead to the disorder of biological functions. Specifically, Fe(III) has important functions in metabolism and enzyme catalysis. More importantly, hemoglobin in the human body is a complex of ...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y40/00C01B32/15G01N21/64
CPCC09K11/65B82Y20/00B82Y40/00C01B32/15G01N21/643G01N2021/6432C01P2004/04C01P2002/82
Inventor 王周玉单飞狮伏丽娟夏浩瑜谢香艳廖成霜朱银霞
Owner XIHUA UNIV
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