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Water-soluble N, S co-doped carbon quantum dot material as well as preparation method and application thereof

A carbon quantum dot and water-soluble technology, which is applied in the field of water-soluble N, S co-doped carbon quantum dot materials and its preparation, can solve the problems of poor mercury ion selectivity, insufficient quantum yield, and insufficient mercury detection sensitivity. Achieve stable fluorescence intensity, good fluorescence quenching effect, and lower detection limit

Pending Publication Date: 2022-05-13
BAOSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For this reason, the technical problem to be solved by the present invention is to provide a water-soluble N, S co-doped carbon quantum dot material and its preparation method and application, to solve the problem that the quantum yield of the current fluorescent carbon quantum dot material is not high enough, the mercury ion Poor selectivity and insufficient sensitivity for trace mercury detection in drinking water

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  • Water-soluble N, S co-doped carbon quantum dot material as well as preparation method and application thereof
  • Water-soluble N, S co-doped carbon quantum dot material as well as preparation method and application thereof
  • Water-soluble N, S co-doped carbon quantum dot material as well as preparation method and application thereof

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Effect test

Embodiment 1

[0042] In this embodiment, the preparation method of water-soluble N, S co-doped carbon quantum dot material comprises the following steps:

[0043] Step A: Dissolving 1 g of citric acid and 0.38 g of thiourea in 35 mL of water in sequence to obtain a precursor solution;

[0044] Step B: Transfer the precursor solution to a 50mL polytetrafluoroethylene reaction tank, and conduct a hydrothermal reaction in a stainless steel autoclave under sealed conditions. The temperature of the hydrothermal reaction is 200°C, and the hydrothermal reaction time is 5h. After the end, the mixed material liquid is obtained;

[0045] Step C: Place the mixed material solution in a dialysis bag with a molecular weight cut-off of 1000D for dialysis for 14 days. After the dialysis, the final solution obtained in the dialysis bag is the carbon quantum dot material solution, and the obtained carbon quantum dot material solution is stored in Store in the refrigerator at 4°C for later use;

[0046] Ste...

Embodiment 2

[0052] In this embodiment, the preparation method of S-doped carbon quantum dot material comprises the following steps:

[0053] Step A: Dissolve 1 g of citric acid and 0.4 g of sulfuric acid in 35 mL of water in sequence to obtain a precursor solution;

[0054] Step B: Transfer the precursor solution to a 50mL polytetrafluoroethylene reaction tank, and conduct a hydrothermal reaction in a stainless steel autoclave under sealed conditions. The temperature of the hydrothermal reaction is 200°C, and the hydrothermal reaction time is 5h. After the end, the mixed material liquid is obtained;

[0055] Step C: Place the mixed material solution in a dialysis bag with a molecular weight cut-off of 1000D for dialysis for 14 days. After the dialysis, the final solution obtained in the dialysis bag is the carbon quantum dot material solution, and the obtained carbon quantum dot material solution is stored in Store in the refrigerator at 4°C for later use;

[0056] Step D: The carbon qu...

Embodiment 3

[0059] In the present embodiment, the preparation method of carbon quantum dot material comprises the following steps:

[0060] Step A: Dissolving 1 g of citric acid in 35 mL of water to obtain a precursor solution;

[0061] Step B: Transfer the precursor solution to a 50mL polytetrafluoroethylene reaction tank, and conduct a hydrothermal reaction in a stainless steel autoclave under sealed conditions. The temperature of the hydrothermal reaction is 200°C, and the hydrothermal reaction time is 5h. After the end, the mixed material liquid is obtained;

[0062] Step C: Place the mixed material solution in a dialysis bag with a molecular weight cut-off of 1000D for dialysis for 14 days. After the dialysis, the final solution obtained in the dialysis bag is the carbon quantum dot material solution, and the obtained carbon quantum dot material solution is stored in Store in the refrigerator at 4°C for later use;

[0063] Step D: The carbon quantum dot material solution is vacuum ...

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Abstract

The invention discloses a water-soluble N, S co-doped carbon quantum dot material and a preparation method and application thereof.The preparation method comprises the steps that A, citric acid and thiourea are sequentially dissolved in water, and a precursor solution is obtained; step B, transferring the precursor solution into a polytetrafluoroethylene reaction tank, carrying out hydrothermal reaction in a stainless steel high-pressure reaction kettle under a sealed condition, and obtaining a mixed material liquid after the reaction is finished; step C, putting the mixed material liquid into a dialysis bag for dialysis, and after dialysis is finished, obtaining a final solution in the dialysis bag, namely a carbon quantum dot material solution; step D, performing vacuum freeze drying on the carbon quantum dot material solution to remove moisture, and drying to obtain powder, namely the water-soluble N, S co-doped carbon quantum dot material; the method can be used for detecting trace mercury ions in drinking water. The material is stable in fluorescence intensity, high in selectivity and good in sensitivity, can be used for detecting trace mercury ions in a solution, and has huge application potential in the fields of life health, environment monitoring and the like.

Description

technical field [0001] The invention relates to the technical field of drinking water detection. Specifically, it is a water-soluble N, S co-doped carbon quantum dot material and its preparation method and application. Background technique [0002] Due to the pollution of drinking water sources caused by the environmental problems brought about by the development of human industrial economy, and the improvement of human living standards for their own life and health, the quality and safety of drinking water has become one of the issues that people are always concerned about. In recent years, river water pollution has caused frequent incidents of deterioration of drinking water quality for residents along the line, prompting a series of technologies such as optics, electrochemistry, chromatography and mass spectrometry to improve the monitoring of drinking water quality, especially drinking water, which is highly toxic and difficult to The detection of degraded heavy metals ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y30/00B82Y40/00G01N21/64
CPCC09K11/65B82Y20/00B82Y30/00B82Y40/00G01N21/643G01N2021/6432
Inventor 汪玉洁张星和侯洪波杨晓娜卢超艾薇
Owner BAOSHAN UNIV
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