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Biomass-based high-efficiency sulfur-nitrogen-doped carbon quantum dots and preparation method and application thereof

A carbon quantum dot and biomass technology, applied in the field of chemical detection, can solve the problem of low CQDsN-doping content, and achieve the effects of rich raw material sources, low cytotoxicity and high biological safety.

Active Publication Date: 2019-02-26
GUANGDONG PHARMA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are few reports on effective heterodoping methods for carbon quantum dots (CQDs). Due to the high solubility of the inorganic precursors of dopants, the conventional hydrothermal carbonization route would result in a large amount of dopants remaining in the reaction solution, leading to the synthesis of CQDs. The lower amount of N-doping

Method used

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  • Biomass-based high-efficiency sulfur-nitrogen-doped carbon quantum dots and preparation method and application thereof
  • Biomass-based high-efficiency sulfur-nitrogen-doped carbon quantum dots and preparation method and application thereof
  • Biomass-based high-efficiency sulfur-nitrogen-doped carbon quantum dots and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0030] Example 1: A biomass-based high-efficiency sulfur-nitrogen-doped carbon quantum dot and its preparation method and application in this example are prepared by the following steps: 14g of chlorophyll alcohol extract, 1g of citric acid, 2.0g of mercaptoethylene Add the amine into a beaker filled with 120mL of pure water, stir to dissolve, then add 0.16g of magnesium chloride to the above mixture, stir until fully dissolved, take 25mL of the mixed solution and place it in a stainless steel reaction kettle, and conduct a hydrothermal reaction at 180°C for 150min. The crude product was obtained by filtration, and then purified appropriately to obtain sulfur and nitrogen doped carbon quantum dots (S,N-CQDs). After diluting the sample of sulfur and nitrogen doped carbon quantum dots obtained by 50000 times, the fluorescence spectrum test is carried out. The test results are shown in the attached figure 1 shown.

Embodiment 2

[0031] Embodiment 2: A biomass-based high-efficiency sulfur-nitrogen-doped carbon quantum dot of this embodiment and its preparation method and application are prepared by the following steps: A biomass-based high-efficiency sulfur-nitrogen-doped carbon quantum dot of this embodiment Quantum dots and their production methods and applications are prepared by the following steps: add 14g of chlorophyll alcohol extract, 1g of citric acid, and 2.0g of mercaptoethylamine into a beaker filled with 120mL of pure water, stir to dissolve, and then add to the above mixture Add 0.16g of magnesium chloride to the solution, stir until fully dissolved, take 25mL of the mixed solution and place it in a stainless steel reaction kettle, conduct a hydrothermal reaction at 180°C for 150min, filter to obtain a crude product, and then obtain the product sulfur and nitrogen doped carbon quantum dots ( S,N-CQDs). After diluting the sample of sulfur and nitrogen doped carbon quantum dots of the obtai...

Embodiment 3

[0032]Example 3: A biomass-based high-efficiency sulfur-nitrogen-doped carbon quantum dot and its preparation method and application in this example are prepared by the following steps: 10g of chlorophyll alcohol extract, 5g of citric acid, 2.0g of ethylene glycol Add the amine into a beaker filled with 120mL of pure water, stir to dissolve, then add 0.16g of magnesium chloride to the above mixture, stir until fully dissolved, take 25mL of the mixed solution and place it in a stainless steel reaction kettle, and conduct a hydrothermal reaction at 180°C for 150min. The crude product was obtained by filtration, and then purified appropriately to obtain nitrogen-containing carbon quantum dots (N-CQDs). After diluting the sample of the obtained product nitrogen-doped carbon quantum dots 500,000 times, the fluorescence spectrum test is carried out. The aqueous solution mass volume concentration of the sample N-CQDs is the fluorescence intensity (ultra-high intensity) of 10ng / mL. The...

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Abstract

The invention discloses biomass-based high-efficiency sulfur-nitrogen-doped carbon quantum dots. The biomass-based high-efficiency sulfur-nitrogen-doped carbon quantum dots are prepared from the following components in weight and volume proportions: 8-14g of a crude chlorophyll extract, 1-6g of citric acid, 0.5-2.5g of mercaptoethylamine, 120-150mL of deionized water and 0.01-0.24g of magnesium chloride. A preparation method of the biomass-based high-efficiency sulfur-nitrogen-doped carbon quantum dots comprises the following steps: extracting the crude chlorophyll extract from plant wastes byusing ethanol, then stirring the raw materials until full dissolution to obtain a mixture, then placing in a stainless steel reaction kettle for a hydrothermal reaction, filtering and purifying to obtain a product. Compared with the prior art, the invention has the advantages as follows: the main raw materials are derived from the plant wastes (environment-friendly); the obtained biomass-based high-efficiency sulfur-nitrogen-doped carbon quantum dots have high biosafety and high fluorescence intensity and can be applied to detection of Cu<2+> and Fe<3+> ions; in addition, when the mass percentage concentration of the biomass-based high-efficiency sulfur-nitrogen-doped carbon quantum dots is 50ng / mL, the fluorescence intensity is very high and the biomass-based high-efficiency sulfur-nitrogen-doped carbon quantum dots can be applied to the field of biomedical imaging, so that the application value is expanded.

Description

technical field [0001] The invention relates to the technical field of chemical detection, in particular to a biomass-based high-efficiency sulfur-nitrogen-doped carbon quantum dot and its preparation method and application. Background technique [0002] There are existing methods for the preparation of carbon quantum dots (CQDs). Citric acid, glucose, natural polymer chitosan, etc. are commonly used as carbon sources, and are combined with substances containing elements such as S and N to form a composite system, which is reacted at a higher temperature 1- After 4 hours, the concentration of CQDs required when the fluorescence intensity of the obtained product (carbon quantum dots) reaches the ideal intensity is about 2 mg / mL. Copper is one of the essential trace elements in living systems, but high concentrations of copper can cause damage to the human liver, kidney tubules, brain and other organs, so it is very important to analyze the trace concentration of copper in env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65A61K49/00
CPCA61K49/0019C09K11/65
Inventor 刘意潘妙钏李叶青
Owner GUANGDONG PHARMA UNIV
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