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A kind of sulfur-doped graphene quantum dots and its preparation method and application of detecting lead ions

A graphene quantum dot, sulfur-doped technology, applied in graphene, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve the problem of wide particle size distribution, poor single crystallinity, Fluorescence emission changes and other problems, to achieve the effect of obvious selective recognition ability

Active Publication Date: 2018-01-16
广州顺倬能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the obtained graphene quantum dots have a wide particle size distribution, poor single crystallinity, and the fluorescence emission is usually dependent on the excitation wavelength, that is, the fluorescence emission will also change when the excitation wavelength changes.

Method used

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  • A kind of sulfur-doped graphene quantum dots and its preparation method and application of detecting lead ions
  • A kind of sulfur-doped graphene quantum dots and its preparation method and application of detecting lead ions
  • A kind of sulfur-doped graphene quantum dots and its preparation method and application of detecting lead ions

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Embodiment 1

[0048] 1. Hydrothermal synthesis of sulfur-doped graphene quantum dots

[0049] After hydrothermal synthesis in a mixed aqueous solution of 1,3,6-trinitropyrene, sodium sulfide and sodium hydroxide for a certain period of time, the resulting solution is purified by dialysis and further freeze-dried to obtain a graphene quantum dot solid. Among them, the concentration of 1,3,6-trinitropyrene is 0.5mg / mL, the concentration of sodium sulfide is 3.0mg / mL, the concentration of sodium hydroxide is 0.1mol / L, the hydrothermal reaction temperature is 200℃, and the hydrothermal reaction temperature is 200℃. The reaction time is 10h. After the reaction product was fully dialyzed through a dialysis bag with a molecular weight cut-off of 1000 Da, the solution in the dialysis bag was fully dialyzed again through a dialysis bag with a molecular weight cut-off of 3500 Da, and the solution outside the dialysis bag was the sulfur-doped graphene quantum dot solution.

[0050] 2. Characterizatio...

Embodiment 2

[0061] 1. Hydrothermal synthesis of sulfur-doped graphene quantum dots

[0062] After hydrothermal synthesis in a mixed aqueous solution of 1,3,6-trinitropyrene, sodium sulfide and sodium hydroxide for a certain period of time, the obtained solution is purified by dialysis and further freeze-dried to obtain a graphene quantum dot solid. Among them, the concentration of 1,3,6-trinitropyrene is 1.0mg / mL, the concentration of sodium sulfide is 8.0mg / mL, the concentration of sodium hydroxide is 0.1mol / L, the hydrothermal reaction temperature is 180℃, and the hydrothermal reaction temperature is 180℃. The reaction time is 6h. After the reaction product was fully dialyzed through a dialysis bag with a molecular weight cut-off of 1000 Da, the solution in the dialysis bag was fully dialyzed again through a dialysis bag with a molecular weight cut-off of 3500 Da, and the solution outside the dialysis bag was the sulfur-doped graphene quantum dot solution.

[0063] 2. Characterization ...

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Abstract

The invention discloses a sulfur-doping graphene quantum dot, a preparation method of the sulfur-doping graphene quantum dot and application of lead ion detection. The preparation method comprises the following steps of dissolving a carbon source compound and a sulfur source compound into water; performing a hydro-thermal reaction under the alkaline condition; preparing the sulfur-doping graphene quantum dot, wherein the carbon source compound is 1,3,6-trinitro pyrene, and the sulfur source compound is soluble sulfide salt. The prepared sulfur-doping graphene quantum dot has excitation wavelength independence; when the excitation wavelength of 410 to 490nm is used for excitation, the fluorescence emission peak position is not changed; lattice lines can be obviously seen in a high resolution transmission electron microscope; the result proves that the sulfur-doping graphene quantum dot synthesized by the invention has single crystal performance; the fluorescence of the substance is quenched by lead ions; the result shows that the obvious selective recognition capability on lead ions is realized; the sulfur-doping graphene quantum dot is hopeful to be used for trace lead ion selective detection.

Description

technical field [0001] The invention relates to the field of new materials, in particular to a sulfur-doped graphene quantum dot, a preparation method thereof and an application for detecting lead ions. Background technique [0002] Graphene quantum dots (graphene quantum dots, GQDs) refer to graphene thin layers with a size of less than 100nm and a thickness of less than 10 layers, which is a new type of fluorescent nano-carbon material. Compared with fluorescent materials such as traditional semiconductor quantum dots and organic dyes, graphene quantum dots have the advantages of good biocompatibility, water solubility, photostability and adjustable luminescent properties. In addition, the unique graphene structure of graphene quantum dots makes it have a large specific surface area and can be connected or composited with other substances through π-π conjugated bonds. These properties make graphene quantum dots have potential application prospects in many fields such as m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65C01B32/184B82Y30/00G01N21/64
CPCC01P2004/64C09K11/65G01N21/6486
Inventor 奚凤娜沈超袁昆刘吉洋
Owner 广州顺倬能源科技有限公司
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