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Method for preparing carbon quantum dot by carbonizing ketone under alkaline condition

A technology of carbon quantum dots and alkaline conditions, applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of complex operation and high cost, and achieve uniform particle size distribution and energy efficiency. The effect of less consumption and low cost

Active Publication Date: 2015-04-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method has a high yield, the operation is complicated, and the electrode needs to use platinum sheets, and electric energy needs to be applied, and a voltage regulating instrument is required, which is costly and has certain limitations.

Method used

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  • Method for preparing carbon quantum dot by carbonizing ketone under alkaline condition
  • Method for preparing carbon quantum dot by carbonizing ketone under alkaline condition
  • Method for preparing carbon quantum dot by carbonizing ketone under alkaline condition

Examples

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Effect test

Embodiment 1

[0024] Prepare a 1.5mol / L sodium hydroxide-acetone mixture, let it stand at room temperature (25°C) for 240h, add an appropriate amount of concentrated hydrochloric acid, adjust its pH to neutral, centrifuge at 12000r / min for 10min, wash with deionized water for 5 Once, vacuum-dried at 80°C for 24 hours to obtain solid carbon quantum dots. Its transmission electron microscope picture is figure 1 , The particle size is relatively uniform, about 10nm. figure 2 According to its X-ray diffraction (XRD) spectrum, the obtained carbon quantum dots are amorphous carbon. image 3 For its photoelectron spectrum (XPS), the 284.6eV peak corresponds to the graphitized sp2 carbon atom, the 286.4eV and 288.3eV peaks correspond to the C-O and C=O carbon atoms, and the carbon quantum dots contain oxygen functional groups. Figure 4 Its fluorescence spectrum diagram has the characteristics of changing with the change of excitation light spectrum. Figure 5 For the photos of different reacti...

Embodiment 2

[0026] Prepare a 0.5mol / L sodium hydroxide butanone mixture, let it stand at room temperature for 360h, add an appropriate amount of concentrated hydrochloric acid, adjust its pH to neutral, centrifuge at 16000r / min for 5min, wash 5 times with deionized water, and Vacuum drying at 120° C. for 12 hours to obtain carbon quantum dot solids with uniform particle size.

Embodiment 3

[0028] Prepare 5mol / L sodium hydroxide acetylacetone (2,4-pentanedione) mixed solution, let it stand for 120h, add an appropriate amount of concentrated hydrochloric acid, adjust its pH to neutral, centrifuge at 8500r / min, use deionized Washing with water for 5 times, and drying in vacuum at 150° C. for 4 hours to obtain solid carbon quantum dots with uniform particle size.

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Abstract

The invention relates to a method for preparing a carbon quantum dot by carbonizing ketone under an alkaline condition. The method comprises the following steps: uniformly mixing alkali with ketone according to a concentration proportion of 0.1mol / L to 10mol / L; reacting for 12-360 hours at the temperature of 15 to 100 DEG C; after the reaction is finished, regulating the pH of the reactants to be neutral by using concentrated hydrochloric acid; centrifugally separating, washing five times by deionized water and drying in vacuum to obtain carbon quantum dot solid powder. The method disclosed by the invention can be used for obtaining the carbon quantum dot by taking the ketone as a carbon source through a standing reaction at room temperature or through a low-temperature heating method; the method is simple, wide in raw material sources, low in cost and capable of realizing large-scale production.

Description

technical field [0001] The invention belongs to the technical field of preparation of carbon quantum dots, and in particular relates to a preparation method of carbon quantum dots. Background technique [0002] The toxicity and harm to the environment of traditional semiconductor quantum dots limit their practical application. The emerging fluorescent carbon quantum dots have been regarded as a general fluorescent nanomaterial due to their unique properties such as photostability, excellent biocompatibility, low toxicity, chemical inertness, and low cost. [0003] The reported methods for preparing carbon quantum dots can be divided into two categories: top-down and bottom-up. The top-down method refers to breaking up larger carbon material structures (graphite, activated carbon, carbon nanotubes, etc.) by laser ablation, ultrasonic treatment, chemical and electrochemical oxidation, etc. to obtain small-sized carbon quantum dots; The bottom-up method refers to the carboniz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C09K11/65B82Y30/00
Inventor 纪效波侯红帅杨应昌景明俊张艳
Owner CENT SOUTH UNIV
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