Preparation method and application of nitrogen-doped carbon quantum dots
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A technology of carbon quantum dots and nitrogen doping, applied in chemical instruments and methods, water treatment of special compounds, water/sludge/sewage treatment, etc. To achieve the effect of rich carbon source, uniform size distribution and stable fluorescence due to the lack of active sites
Inactive Publication Date: 2019-01-25
QINZHOU UNIV
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Although carbon quantum dots have many excellent properties, the disadvantages are that the currently synthesized carbon quantum dots have
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Embodiment 1
[0036] 1) Put sucrose and ethanolamine in a glass container, add water three times, fully stir, and ultrasonically obtain a clear solution. The sum of the three times of water addition is such that the mass concentration of sucrose is 60g / L, and the mass concentration of sucrose and ethanolamine is 60g / L. The volume ratio is 1.5g:1.5ml;
[0037] 2) Put the clear solution obtained in step 1) into the liner of a polytetrafluoroethylene hydrothermal kettle, and react at 200° C. for 5 hours to obtain a reaction solution;
[0038] 3) Cool the reaction solution obtained in step 2) to room temperature, and filter it with a Buchner funnel. The filter paper is a medium-speed qualitative filter paper, centrifuged at a speed of 10000r / min for 10min, and filtered twice with a filter membrane with a pore size of 0.22 μm. , using a dialysis bag with a cut-off molecular weight of 1000, dialyzed for 24 hours to obtain a dialysate;
[0039] 4) Concentrate the dialysate obtained in step 3) wit...
Embodiment 2
[0047] 1) Put sucrose and ethanolamine in a glass container, add water three times, fully stir, and ultrasonically obtain a clear solution. The sum of the three times of water addition is such that the mass concentration of sucrose is 60g / L, and the mass concentration of sucrose and ethanolamine is 60g / L. The volume ratio is 1.5g:0.3ml;
[0048] All the other steps are the same as in Example 1, and its relative quantum yield (taking quinine sulfate as a standard) is 15.5%.
Embodiment 3
[0050] 1) Put sucrose and ethanolamine in a glass container, add water three times, fully stir, and ultrasonically obtain a clear solution. The sum of the three times of water addition is such that the mass concentration of sucrose is 60g / L, and the mass concentration of sucrose and ethanolamine is 60g / L. The volume ratio is 1.5g:0.9ml;
[0051] All the other steps are the same as in Example 1, and its relative quantum yield (taking quinine sulfate as a standard) is 16%.
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Abstract
The invention belongs to the technical field of fluorescent carbon nanomaterials, and particularly relates to a preparation method of nitrogen-doped carbon quantum dots. The preparation method of thenitrogen-doped carbon quantum dots comprises the following preparation steps: 1) placing saccharose and ethanolamine in a glass vessel, adding water for three times, fully stirring, and carrying out ultrasonic treatment to obtain a settled solution; 2) placing the settled solution obtained in step 1) in a liner of a polytetrafluoroethylene hydrothermal reactor to obtain reaction liquid; 3) coolingthe reaction liquid obtained in step 2) to a room temperature, carrying out suction filtration and centrifuging, filtering the reaction liquid with a filter membrane, and dialyzing the reaction liquid to obtain dialysate; and 4) concentrating the dialysate obtained in step 3), and drying under vacuum to obtain nitrogen-doped carbon quantum dot solid powder. The prepared water-soluble nitrogen-doped carbon quantum dots have good water solubility, are adjustable in stimulation and emission, stable in fluorescence, good in biocompatibility and high in yield, and has good application prospect inthe fields of bio-imaging, fluorescence probes, photocatalysis and the like.
Description
technical field [0001] The invention belongs to the technical field of fluorescent carbon nanomaterials, in particular to a method for preparing nitrogen-doped carbon quantum dots and its application, in particular to a method for preparing nitrogen-doped fluorescent carbon quantum dots and its application in the field of photocatalysis . Background technique [0002] As a new type of luminescent material, carbon quantum dots have the advantages of low toxicity and good biocompatibility compared with traditional semiconductor quantum dots and organic dyes, and have adjustable luminous range, large two-photon absorption cross-section, Fluorescence has the advantages of high quantum yield, good photostability, no light flicker, easy functionalization, low price and easy large-scale synthesis, etc. Its application in the field of biomedicine, especially in the dynamic tracking and imaging of cells and living bodies, has been demonstrated. It has huge potential and has already ...
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