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Preparation method of wavelength adjustable fluorescent carbon dot and application of fluorescent carbon dot in mercury ion detection

A technology of fluorescent carbon dots and mercury ions, applied in fluorescence/phosphorescence, chemical instruments and methods, luminescent materials, etc., can solve the problems of low quantum yield, achieve simple synthesis methods, easy control of reaction conditions, and good repeatability of results Effect

Active Publication Date: 2015-05-13
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Description
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AI Technical Summary

Problems solved by technology

However, most of the carbon dots synthesized by these methods excite blue fluorescence with a very short wavelength, while there are few reports of green or yellow fluorescent carbon dots with longer wavelengths, and the quantum yield is very low

Method used

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  • Preparation method of wavelength adjustable fluorescent carbon dot and application of fluorescent carbon dot in mercury ion detection
  • Preparation method of wavelength adjustable fluorescent carbon dot and application of fluorescent carbon dot in mercury ion detection
  • Preparation method of wavelength adjustable fluorescent carbon dot and application of fluorescent carbon dot in mercury ion detection

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preparation example Construction

[0024] The preparation method of the wavelength-tunable fluorescent carbon dot proposed by the present invention comprises the following steps:

[0025] (1) adding valine to 10 milliliters of water so that the mass percent concentration of valine is 0.2% to 30%, place it on a magnetic stirrer, stir to fully dissolve valine, and obtain an aqueous solution of valine;

[0026] (2) Add 1 to 10 milliliters of concentrated phosphoric acid into the valine aqueous solution of step (1), and continue stirring until the solution is a uniformly dispersed solution;

[0027] (3) Put the uniformly dispersed solution of step (2) into a hydrothermal reaction kettle, move it into an oven for pyrolysis reaction, the reaction temperature is 100°C-120°C, and the reaction time is 2-24 hours to obtain a crude product;

[0028] (4) or put the uniformly dispersed solution of step (2) into a constant temperature water bath, place it on a magnetic stirrer to stir and react, the reaction temperature is 6...

Embodiment 1

[0039] (1) 1 gram of valine is added to 10 milliliters of concentrated phosphoric acid, placed on a magnetic stirrer, fully stirred so that valine is fully dissolved, and a uniformly dispersed solution is obtained;

[0040] (2) Put the solution obtained in step (1) into a hydrothermal reaction kettle, move it into an oven for pyrolysis reaction, the reaction temperature is 120° C., and the reaction time is 4 hours to obtain a crude product;

[0041] (3) After the crude product of step (3) is neutralized with 1 mole per liter of sodium oxide solution, the precipitate is removed through a 0.22 micron microporous membrane to obtain an aqueous solution of blue fluorescent carbon dots.

[0042] The photoluminescence property characterization of gained carbon dot: irradiate the carbon dot aqueous solution sample with the ultraviolet lamp of wavelength 365 nanometers, can observe obvious blue fluorescence, as figure 1 As shown in B, figure 1 A is a photo of the sample under indoor w...

Embodiment 2

[0044] (1) Add 1 gram of valine to 10 milliliters of water, place on a magnetic stirrer, and stir until the valine is fully dissolved to obtain a 10% valine aqueous solution;

[0045] (2) 2 milliliters of concentrated phosphoric acid are added in the solution obtained in step (1), and continue to stir until the solution is a uniformly dispersed solution;

[0046] (3) Put the solution obtained in step (2) into a constant temperature water bath, place it on a magnetic stirrer to stir the reaction, the reaction temperature is 90° C., and the reaction time is 4 hours to obtain the crude product;

[0047] (4) After the crude product of step (3) is neutralized with 1 mole per liter of sodium hydroxide solution, the precipitate is removed by a 0.22 micron microporous membrane to obtain an aqueous solution of green fluorescent carbon dots.

[0048] The photoluminescence property characterization of gained carbon dot: irradiate the carbon dot aqueous solution sample with the ultraviole...

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Abstract

The invention relates to a preparation method of a wavelength adjustable fluorescent carbon dot and an application of the fluorescent carbon dot in mercury ion detection and belongs to the technical field of nanomaterials. The method takes valine as a raw material and obtains a carbon dot aqueous solution with long wavelength and an adjustable fluorescence color by a hydrothermal synthesis method. The method only requires phosphoric acid for adjustment, raw materials are easy to obtain and nontoxic; special protection is not required in a production process; reaction conditions are easy to control; and the obtained carbon dot has the advantages of high productivity, high quantum efficiency, good result repeatability and the like. The method has the characteristics that the method has high productivity and low cost and facilitates mass production, and a preparation technology is simple and the like. The carbon dot prepared by the method can be used for high selectivity and high sensitivity detection of mercury ions, and a limit of detection reaches 1.5*10<-9>Mol / L.

Description

technical field [0001] The invention relates to a preparation method of fluorescent carbon dots with adjustable wavelength and its application in mercury ion detection, belonging to the technical field of nanometer materials. Background technique [0002] Mercury ion is one of the most toxic heavy metal ions and is regarded as one of the most prevalent and dangerous pollutants to human health and the environment. According to reports, exposure to high concentrations of mercury ions can induce serious toxic effects on human health, such as brain damage, central nervous system damage, endocrine system damage, and various cognitive and movement disorders. Therefore, it is necessary to develop a simple and rapid detection method with high selectivity and sensitivity for mercury ions. Up to now, the methods for mercury ion detection mainly include atomic absorption spectrometry, atomic fluorescence spectrometry, inductively coupled plasma mass spectrometry, selective cold atomic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65G01N21/64C01B31/02
Inventor 刘向峰崔岩岩张春芳胡中波
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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