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A kind of sulfur-doped graphene quantum dots and preparation method thereof and application of detecting silver ions

A technology of graphene quantum dots and sulfur doping, applied in the direction of graphene, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve the problem of poor single crystal, changes in fluorescence emission, and graphene quantum dots Wide particle size distribution and other issues, to achieve the effects of stable fluorescence emission, rapid detection, and obvious selective recognition ability

Active Publication Date: 2018-03-09
苏州冉星网络科技有限公司
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  • 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 preparation method thereof and application of detecting silver ions
  • A kind of sulfur-doped graphene quantum dots and preparation method thereof and application of detecting silver ions
  • A kind of sulfur-doped graphene quantum dots and preparation method thereof and application of detecting silver ions

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Embodiment 1

[0043] (1) Hydrothermal synthesis of sulfur-doped graphene quantum dots: hydrothermal synthesis in a mixed aqueous solution of 1,3,6-trinitropyrene and 3-mercaptopropionic acid to synthesize sulfur-doped graphene quantum dots , the obtained graphene quantum dots are purified by dialysis and freeze-dried to obtain graphene quantum dot solids.

[0044] Among them, the concentration of 1,3,6-trinitropyrene is 0.1mg / mL, the concentration of 3-mercaptopropionic acid is 5.0mg / mL, and the hydrothermal reaction is carried out in a hydrothermal kettle at 200°C for 4h, and the volume of the reaction solution accounts for 20% of the volume of the hydrothermal kettle; the product dialysis purification method is: after the reaction product is fully dialyzed through a dialysis bag with a molecular weight cut-off of 6000Da, the solution outside the dialysis bag is fully dialyzed again through a dialysis bag with a molecular weight cut-off of 3500Da, and the solution in the dialysis bag is It...

Embodiment 2

[0062] (1) Hydrothermal synthesis of sulfur-doped graphene quantum dots: hydrothermal synthesis in a mixed aqueous solution of 1,3,6-trinitropyrene and 3-mercaptopropionic acid to synthesize sulfur-doped graphene quantum dots , the obtained graphene quantum dots are purified by dialysis and freeze-dried to obtain graphene quantum dot solids.

[0063] Among them, the concentration of 1,3,6-trinitropyrene is 0.5mg / mL, the concentration of 3-mercaptopropionic acid is 4.5mg / mL, the hydrothermal reaction is carried out in a hydrothermal kettle at 180°C for 10h, and the volume of the reaction solution accounts for 30% of the volume of the hydrothermal kettle; the product dialysis purification method is as follows: after the reaction product is fully dialyzed through a dialysis bag with a molecular weight cut-off of 6000Da, the solution outside the dialysis bag is fully dialyzed again through a dialysis bag with a molecular weight cut-off of 3500Da, and the solution in the dialysis ba...

Embodiment 3

[0072] (1) Hydrothermal synthesis of sulfur-doped graphene quantum dots: hydrothermal synthesis in a mixed aqueous solution of 1,3,6-trinitropyrene and 4-mercaptobutyric acid to synthesize sulfur-doped graphene quantum dots , the obtained graphene quantum dots are purified by dialysis and freeze-dried to obtain graphene quantum dot solids.

[0073] Among them, the concentration of 1,3,6-trinitropyrene is 0.5mg / mL, the concentration of 4-mercaptobutyric acid is 5.0mg / mL, and the hydrothermal reaction is carried out in a hydrothermal kettle at 190°C for 8h, and the volume of the reaction solution accounts for 35% of the volume of the hydrothermal kettle; the product dialysis purification method is: after the reaction product is fully dialyzed through a dialysis bag with a molecular weight cut-off of 6000Da, the solution outside the dialysis bag is fully dialyzed again through a dialysis bag with a molecular weight cut-off of 3500Da, and the solution in the dialysis bag is It is ...

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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 silver 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; preparing the sulfur-doping graphene quantum dot, wherein the carbon source compound is 1,3,6-trinitro pyrene, and the sulfur source compound is sulfydryl fatty acid with the carbon atom number being 3 to 4. The prepared sulfur-doping graphene quantum dot has good fluorescence property; when the pH is greater than 4, the stable fluorescence emission is realized; the excitation wavelength independence is realized; when the excitation wavelength of 320 to 360nm is used for excitation, the fluorescence emission peak position is not changed; the result proves that the sulfur-doping graphene quantum dot synthesized by the method provided by the invention has high quality; the obvious selective recognition capability on silver ions is realized; the fast detection on trace silver ions can be realized.

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 silver ions. Background technique [0002] Heavy metals are highly toxic and can cause irreversible damage to tissues and organs of the human body. Even trace amounts can easily cause cancer. Industrial waste water and industrial waste gas in industrial production often have a high concentration of heavy metals, causing serious heavy metal pollution to the environment. [0003] Silver is a widely used heavy metal. It has long been made into currency and various decorations for people's daily life. In addition, metallurgy, electroplating, photocopying, antibacterial and anti-inflammatory drug production and other industries all need various silver salts. However, the excessive use of silver-containing compounds will undoubtedly pollute the environment and endanger human health. Ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65C01B32/182C01B32/184B82Y30/00G01N21/64
CPCC01P2004/64C09K11/65G01N21/6486
Inventor 奚凤娜边仕月焦雅洁刘吉洋
Owner 苏州冉星网络科技有限公司
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