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Preparation method and application of nitrogen-sulfur doped carbon quantum dots

A technology of carbon quantum dots and nitrogen sulfur, which is applied in the field of preparation of carbon quantum dot fluorescent probes, can solve the problems of high toxicity and poor instability, and achieve high-sensitivity detection and simple methods

Inactive Publication Date: 2019-07-23
马娇
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  • Application Information

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Problems solved by technology

At present, common fluorescent probes are mainly divided into two types: non-carbon-based and carbon-based. Non-carbon-based fluorescent probes mainly include semiconductor quantum dots of various selenides and sulfides. These semiconductor quantum dots have high potential Toxicity, instability, and poor biocompatibility make it a major obstacle to its widespread use

Method used

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  • Preparation method and application of nitrogen-sulfur doped carbon quantum dots
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  • Preparation method and application of nitrogen-sulfur doped carbon quantum dots

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preparation example Construction

[0030] A method for preparing nitrogen-sulfur-doped carbon quantum dots for mercury ion detection, comprising the following steps:

[0031] (1) First, take an appropriate amount of carbon source, nitrogen source and sulfur source, mix and stir it in deionized water, then centrifuge and dry, and grind and refine the obtained solid mixture in an agate mortar;

[0032] (2) putting the solid mixture obtained in step (1) into a microwave oven for preliminary carbonization doping reaction;

[0033] (3) Take out the product after the reaction in step (2) from the microwave oven, then use the mortar again to grind and refine it, and then disperse it in deionized water again, wherein the water-solid volume mass ratio is 3- 5:1;

[0034] (4) Transfer the mixture obtained in step (3) to a microwave reactor, set the temperature rise program, heat up to 140-180°C and keep it warm for 10-30min;

[0035] (5) After the reaction is finished, after the reaction vessel is naturally cooled to r...

Embodiment 1

[0037] Weigh milk powder, urea and thiourea according to the mass ratio of 3:1.5:1, put them into a beaker, add deionized water, use a glass rod to stir evenly, and then use a 50mL centrifuge tube to centrifuge, dry and use agate Mortar grinding 20min. Then the grinding material is placed on the filter paper, the power of the microwave oven is set to 300W, and the grinding material is irradiated for 3 minutes (here, because the raw material for the reaction is easy to decompose, the reaction time must not be too long), after the reaction, the grinding material is taken from Take it out of the microwave oven, then collect it in a mortar, and grind it again for 20 minutes. Afterwards, use 20mL of deionized water to completely dissolve the above substances, transfer to a hydrothermal microwave reaction vessel, heat up to 140°C and react for 30min. , Filter and wash.

Embodiment 2

[0039] Weigh milk powder, urea and thiourea respectively according to the mass ratio of 4:2:1, put them into a beaker, add deionized water, stir them evenly with a glass rod, then use a 50mL centrifuge tube for centrifugation, and use agate Mortar grinding 20min. Then the grinding material is placed on the filter paper, the power of the microwave oven is set to 400W, and the grinding material is irradiated for 2min (here, because the raw material for the reaction is easy to decompose, the reaction time must not be too long), after the reaction, the grinding material is taken from Take it out of the microwave oven, then collect it in a mortar and grind it again for 20 minutes. Afterwards, use 30mL of deionized water to completely dissolve the above substances, then transfer to a hydrothermal microwave reaction vessel, heat up to 180°C and react for 10min. , Filter and wash.

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Abstract

The invention provides a method for high sensitivity detection of mercury ions by using nitrogen-sulfur doped carbon quantum dots. The method includes the following steps: a carbon source, a nitrogensource and a sulfur source are mixed, a mode of liquid phase mixing is used to uniformly mix the three sources, a microwave preliminary reaction is carried out to realize initial doping of hetero atoms, and then a one-step reaction of hydrothermal microwave is carried out to directly prepare the nitrogen-sulfur doped carbon quantum dots. The carbon quantum dots are used for detection of mercury ions and show high sensitivity and an extremely low detection line. The preparation method does not use any toxic and harmful substances and is a completely green synthetic route.

Description

technical field [0001] The invention relates to the technical field of fluorescent probes, in particular to a carbon quantum dot fluorescent probe, in particular to a preparation method and application of the carbon quantum dot fluorescent probe for detecting metal mercury ions. Background technique [0002] Fluorescent probe is a widely used detection method. Generally, as the concentration of the substance to be detected changes, the fluorescence intensity of the fluorescent probe will change significantly. Therefore, it has extensive and in-depth research in the fields of industrial and agricultural production, scientific research, environmental science, and biomedicine. At present, common fluorescent probes are mainly divided into two types: non-carbon-based and carbon-based. Non-carbon-based fluorescent probes mainly include semiconductor quantum dots of various selenides and sulfides. These semiconductor quantum dots have high potential Toxicity, instability and poor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y40/00C09K11/0883C09K11/65G01N21/643
Inventor 马娇
Owner 马娇
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