Nitrogen-doped carbon quantum dots and preparation method and application thereof

A technology of carbon quantum dots and nitrogen doping, applied in chemical instruments and methods, measuring devices, nanotechnology for materials and surface science, etc., can solve problems such as high toxicity and poor stability

Active Publication Date: 2019-01-04
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
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Problems solved by technology

Although the fluorescence method has high sensitivity, the organic fluorescent markers currently used often have defects such as high toxicity and poor stability in practical applications, making it difficult to apply for further in situ analysis

Method used

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  • Nitrogen-doped carbon quantum dots and preparation method and application thereof
  • Nitrogen-doped carbon quantum dots and preparation method and application thereof
  • Nitrogen-doped carbon quantum dots and preparation method and application thereof

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[0033] The invention provides a method for preparing nitrogen-doped carbon quantum dots, comprising the following steps:

[0034] The crude extract containing proanthocyanidin, organic nitrogen dopant and water are mixed, and hydrothermal carbonization reaction is carried out to obtain nitrogen-doped carbon quantum dots.

[0035] In the present invention, the organic nitrogen dopant is preferably triethylamine or ethylenediamine. In the present invention, the mass content of proanthocyanidins in the crude extract containing proanthocyanidins is preferably 3-5%, more preferably 3.5-4.8%, most preferably 4.0-4.5%. In the present invention, the ratio of the crude extract containing proanthocyanidins to the organic nitrogen dopant is preferably 1-1.25g: 2mL, more preferably 1.05-1.20g: 2mL, most preferably 1.10-1.15g: 2mL . The present invention has no special limitation on the raw materials for preparing the crude extract containing proanthocyanidins, and the materials containi...

Embodiment 1

[0045] Ultrasonically mix 1.25g of proanthocyanidin crude extract from Camellia oleifera husk, 2mL of triethylamine and 30mL of deionized water, put it into a 50mL reaction kettle; put the reaction kettle into a blast drying oven, and heat up to 200℃ at a rate of 5℃ / min , carry out the hydrothermal carbonization reaction at 200°C for 6h; after the reaction, cool the hydrothermal carbonization reaction product to room temperature; successively undergo centrifugation at 9000r / min, and filter through a 0.22μm water phase filter membrane to obtain a clear and transparent brown solution; The solution was evaporated and concentrated in a water bath at 60°C to 2-3 mL, and then freeze-dried at -40°C for 12 hours to obtain nitrogen-doped carbon quantum dots, which were named N-CDs; the fluorescence quantum yield (QY) of N-CDs was measured to be about 10 %.

[0046] The extraction process of the crude extract of proanthocyanidins from camellia oleifera husk includes: (a) weighing a cert...

Embodiment 2

[0063] Ultrasonically mix 1.25g crude proanthocyanidin extract of camellia oleifera husk, 2mL triethylamine and 30mL deionized water, put it into a 50mL reaction kettle; put the reaction kettle into a blast drying oven, and heat up to 180℃ at a rate of 2℃ / min , carry out the hydrothermal carbonization reaction at 180°C for 8h; after the reaction, cool the hydrothermal carbonization reaction product to room temperature; successively undergo centrifugation at 9000r / min, and filter through a 0.22μm water phase filter membrane to obtain a clear and transparent brown solution; The clear and transparent brown solution was evaporated and concentrated in a water bath at 60°C to 2-3 mL, and then freeze-dried at -40°C for 12 hours to obtain N-CDs; the fluorescence quantum yield (QY) of N-CDs was determined to be 7%.

[0064] The extraction process of the crude extract of proanthocyanidins from camellia oleifera husk is the same as that in Example 1.

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Abstract

The invention provides a preparation method of nitrogen-doped carbon quantum dots, and belongs to the technical field of preparation of functional materials. The preparation method comprises the following steps: mixing a crude extract containing procyanidine, an organic nitrogen doping agent and water, and carrying out hydrothermal carbonization to obtain the nitrogen-doped carbon quantum dots. The procyanidine extract is a carbon precursor, after the procyanidine extract is mixed with an organic nitrogen doping agent and then is subjected to hydrothermal reaction, the surface functional groups of the formed nitrogen-doped carbon quantum dots are abundant, and the nitrogen-doped carbon quantum dots have high fluorescence and excellent pH stability and high ion strength tolerance; and the nitrogen-doped carbon quantum dots have high selectivity on common perfluorooctane sulphonate in water. From embodiments, the detection linear range of the nitrogen-doped carbon quantum dots to the perfluorooctane sulphonate is 3-160* 10-10 mol/L, the detection limit is 0.3 nM, and the itrogen-doped carbon quantum dots can be used for rapidly detecting a trace amount of the perfluorooctane sulphonate in an environmental water sample.

Description

technical field [0001] The invention relates to the technical field of preparation of functional materials, in particular to a nitrogen-doped carbon quantum dot and its preparation method and application. Background technique [0002] Perfluorinated chemicals (PFCs for short) are a class of compounds produced by replacing all the hydrogen atoms in hydrocarbons and their derivatives with fluorine atoms. Since it was successfully developed by the American 3M Company in 1951, this compound has been widely used in chemical industry, textile, leather, fire protection, daily detergent, cooking utensils, etc. due to its excellent thermal stability, chemical stability and hydrophobic and oleophobic properties. Manufacturing and many other industries that are closely related to human daily life. Perfluorooctane sulfonate (Perfluorooctane sulfonate, PFOS) and perfluorooctanoic acid (Perfluorooctane acid, PFOA), two typical perfluorinated compounds in the environment, are the final pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y30/00B82Y20/00G01N21/64
CPCB82Y20/00B82Y30/00C09K11/65G01N21/643
Inventor 郭会琴林立钶颜流水林森李可心李晶陈燕飞刘胜锋
Owner NANCHANG HANGKONG UNIVERSITY
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