Method for extracting carbon quantum dots from activated carbon

A technology for carbon quantum dots and activated carbon, which is applied in the field of extracting carbon quantum dots, can solve the problems of low yield, expensive instruments, complicated processes, etc., and achieves the effects of uniform particle size, easy purification, and simple preparation process.
CN101973541AActive Publication Date: 2011-02-16FUZHOU UNIV
1 Cites 52 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
FUZHOU UNIV
Publication Date
2011-02-16

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention provides a method for extracting carbon quantum dots from activated carbon, which comprises the following steps of: adding dry activated carbon powder to salpeter solution and stirring for backflow; performing reduced pressure distillation for evaporating suspension obtained by backflow to dryness; dispersing obtained black solids in water, and neutralizing obtained solution with sodium hydroxide; and finally, centrifugating neutralized black suspension for removing precipitation, separating supernatant fluid by using an ultrafiltration centrifugal tube or an ultrafiltration membrane, collecting filtrate, and drying the filtrate to obtain carbon quantum dots. The method uses cheap and available activated carbon as carbon sources, and can obtain a large number of carbon quantum dots by simple chemical oxidation process and simple subsequent processes of evaporation, saturation, centrifugation and ultrafiltration. The carbon quantum dots are graphite structure nanocrystals with the grain diameter of 3 to 5 nm, the surfaces of which have a large amount of hydroxide radicals. The carbon quantum dots have good fluorescence and electrochemiluminescence.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a method for extracting carbon quantum dots from activated carbon. Background technique

[0002] Luminescent nanoparticles have important application value in optoelectronic devices, biomarkers and biomedicine. Semiconductor quantum dots such as CdS, CdSe, CdTe, CdSe / ZnSe, PbS, Si, etc. have the advantages of controllable size, narrow emission wavelength range and high luminous quantum yield, but due to their poor water solubility, chemical Poor stability and most of them have strong toxicity and other shortcomings, which greatly restrict their application, especially in the field of biomedicine.

[0003] Compared with the above-mentioned common semiconductor quantum dots, carbon quantum dots have many advantages, such as good chemical stability, biocompatibility and low toxicity, etc., thus gaining more and more attention. However, as an emerging nanomaterial, the preparation method of carbon dots is still rare. The methods...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More