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A kind of fluorescent carbon dot and its preparation method and application

A technology of fluorescent carbon dots and carbon dots, which is applied in the directions of fluorescence/phosphorescence, chemical instruments and methods, luminescent materials, etc., can solve the problems of inability to detect by colorimetry, unfavorable real-time detection, and use of toxic reagents, and achieves the preparation method. Environmentally friendly, easy to operate, and effective in improving selectivity

Active Publication Date: 2021-05-14
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods use toxic reagents and cannot be used for colorimetric detection, which is not conducive to convenient and real-time detection, which limits their wider application

Method used

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  • A kind of fluorescent carbon dot and its preparation method and application
  • A kind of fluorescent carbon dot and its preparation method and application
  • A kind of fluorescent carbon dot and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of fluorescent carbon dots:

[0035] (1) Add 0.5g of salvia miltiorrhiza, 0.5g of coffee and 0.2g of urea into 20g of deionized water and mix to obtain a mixed solution;

[0036] (2) Transfer the mixed solution obtained in step (1) to a hydrothermal reaction kettle, and perform a hydrothermal reaction at 220° C. for 5 hours;

[0037] (3) The product obtained in step (2) was centrifuged at 3000r / min to remove insoluble matter, and dialyzed for 12h with a dialysis bag with a molecular weight cut-off of 500-1000Da to obtain a carbon dot solution;

[0038] (4) Freeze-drying the carbon dot solution obtained in step (3) to obtain a carbon dot solid.

[0039] The prepared carbon dot solid can emit different colors of fluorescence at different concentrations M in aqueous solution: when M>76.8mg / L, it emits orange light; when M=38.4~64mg / L, it emits yellow light; when M<12.8mg / L It emits blue light when L.

[0040] The photos of photoluminescence when the concentr...

Embodiment 2

[0047] Preparation of fluorescent carbon dots:

[0048] (1) Add 1 g of salvia miltiorrhiza, 0.5 g of coffee, and 0.5 g of urea into 30 g of deionized water and mix to obtain a mixed solution;

[0049] (2) Transfer the mixed solution obtained in step (1) to a hydrothermal reaction kettle, and perform a hydrothermal reaction at 210° C. for 7 hours;

[0050] (3) The product obtained in step (2) was centrifuged at 3000r / min to remove insoluble matter, and dialyzed for 12h with a dialysis bag with a molecular weight cut-off of 500-1000Da to obtain a carbon dot solution;

[0051] (4) Freeze-drying the carbon dot solution obtained in step (3) to obtain a carbon dot solid.

[0052] The prepared carbon dot solid can emit different colors of fluorescence at different concentrations M in aqueous solution: when M>76.8mg / L, it emits orange light; when M=38.4~64mg / L, it emits yellow light; when M<12.8mg / L It emits blue light when L.

Embodiment 3

[0054] Preparation of fluorescent carbon dots:

[0055] (1) Add 0.5g of salvia miltiorrhiza, 0.3g of coffee, and 0.4g of urea into 15g of deionized water and mix to obtain a mixed solution;

[0056] (2) Transfer the mixed solution obtained in step (1) to a hydrothermal reaction kettle, and perform hydrothermal reaction at 200° C. for 4 hours;

[0057] (3) The product obtained in step (2) was centrifuged at 3000r / min to remove insoluble matter, and dialyzed for 12h with a dialysis bag with a molecular weight cut-off of 500-1000Da to obtain a carbon dot solution;

[0058] (4) Freeze-drying the carbon dot solution obtained in step (3) to obtain a carbon dot solid.

[0059] The prepared carbon dot solids can emit different colors of fluorescence at different concentrations M in aqueous solution: when M>76.8mg L -1 Glows orange sometimes; M=38.4~64mg·L -1 Yellow light sometimes; M-1 glows blue.

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Abstract

The invention provides a fluorescent carbon point and a preparation method and application thereof, belonging to the field of fluorescent nanometer materials. Preparation of carbon dots: add salvia miltiorrhiza, coffee, and urea to deionized water and mix to obtain a mixed solution; transfer the obtained mixed solution to a hydrothermal reaction kettle for reaction; centrifuge the obtained product to remove insoluble matter, and use a dialysis bag Impurities are removed by dialysis to obtain a carbon dot solution; the obtained carbon dot solution is freeze-dried to obtain a carbon dot solid. The fluorescent colors of the prepared carbon dots showed orange, yellow and blue with the decrease of the concentration. We chose yellow fluorescent carbon dots for the detection of Fe 3+ and L‑AA. When adding Fe 3+ , the yellow fluorescence of carbon dots was quenched, and the color of carbon dot solution changed from light yellow to dark brown. When L‑AA was added to the system, the yellow fluorescence of the carbon dots recovered, and the color of the solution returned from dark brown to light yellow. The fluorescent carbon dot prepared by the invention has low toxicity, and can realize the detection of Fe by fluorescence method and colorimetry 3+ , and continuous detection of Fe by fluorescence and colorimetry 3+ , L‑AA.

Description

technical field [0001] The invention relates to fluorescent nanomaterials, in particular to a fluorescent carbon point and a preparation method thereof, and the detection of Fe by the fluorescent method and the colorimetric method by the carbon point 3+ and ascorbic acid (L-AA). Background technique [0002] As a rising star in the family of carbon nanomaterials, carbon dots are widely used in bioimaging, chemical sensing, solid-state lighting, medical diagnosis, and fingerprint detection due to their good biocompatibility, low toxicity, and excellent optical properties. [0003] Fe 3+ As one of the main raw materials for the synthesis of hemoglobin in the human body, it plays a vital role in many biological reactions. Both iron deficiency and excessive intake of iron will have great damage to the body. At the same time, L-AA is also an essential intake substance for the human body and plays an important role in health. Therefore, the development of an intuitive, efficie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65G01N21/64
CPCC09K11/65G01N21/6428G01N2021/6432
Inventor 石利红侯志朋董川双少敏
Owner SHANXI UNIV