Method for synthesizing S and N co-doped carbon dots

A synthesis method and co-doping technology, applied in the field of synthesis of S, can solve the problems of affecting the synthesis method of carbon dots, limited efficiency of carbon dots, and difficult to meet actual production.

Inactive Publication Date: 2019-06-28
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

However, most of the current bottom-up methods need to be carried out in a solvent, and some toxic solvents will affect the choice of carbon dot synthesis; the efficiency of the solvent method to produce carbon dots is also very limited, and it is difficult to meet the actual production needs.

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  • Method for synthesizing S and N co-doped carbon dots
  • Method for synthesizing S and N co-doped carbon dots
  • Method for synthesizing S and N co-doped carbon dots

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Embodiment 1

[0022] Using this method to synthesize S, N co-doped carbon dots (S,N-CDs), and with P25TiO 2 Composite for the degradation of nitric oxide (NO) indoors, the specific experimental steps are as follows:

[0023] A, 1.05g citric acid and 1.14g thiourea are fully mixed and ground;

[0024] B. Transfer the mixed precursor to a 50mL reactor, and react at 160°C for 6h;

[0025] C. Add the reacted solid into 2mol / L NaOH solution, then centrifuge at 10000rpm for 30min to separate insoluble impurities and solution;

[0026] D, utilizing a 0.22 μm microporous membrane to filter the solution obtained in step C;

[0027] E. Utilize the dialysis bag with a molecular weight cut-off of 2000D to seal the solution obtained in step D, put it into deionized water for dialysis treatment for 24 hours, finally collect the liquid in the dialysis bag, and freeze-dry to obtain a carbon dot solid;

[0028] F, 0.2g P25TiO 2 Add 2 mL of carbon dot solution with a concentration of 2 mg / mL to 16 mL of ...

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Abstract

The invention aims to provide a method for synthesizing S and N co-doped carbon dots under a solid phase condition. The method comprises the following specific steps of: A, fully mixing and grinding citric acid and thiourea; B, transferring the mixed precursor into a reaction kettle, and performing reaction for a plurality of hours at a certain temperature; C, adding the reacted solid into a NaOHsolution with a certain concentration, and centrifuging to separate insoluble impurities from the solution; D, filtering the solution obtained in the step C by using a microporous film; and E, sealingthe solution obtained in the step D by using a dialysis bag, putting the solution into deionized water for dialysis for a certain time, and finally collecting the liquid in the dialysis bag, and freeze-drying to obtain carbon dot solids. Compared with the prior art, the carbon dots prepared by the method have good fluorescence performance and photocatalytic enhancement function, and the preparedcarbon dots have the advantages of uniform size, less impurities, simple and convenient synthesis process and high application value.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a method for synthesizing S, N co-doped carbon dots under solid phase conditions. Background technique [0002] Carbon dots are carbon nanomaterials with three-dimensional dimensions less than 10nm, mainly composed of carbon elements. The surface of carbon dots contains organic functional groups such as hydroxyl and carboxyl groups, so carbon dots have strong water solubility; at the same time, due to the quantum confinement effect and special chemical composition of carbon dots, the fluorescence characteristics, biocompatibility and The low toxicity is remarkable, and it has received extensive attention in research in various fields (luminescent materials, bioimaging, ion detection, photocatalysis, etc.). The synthesis methods of carbon dots can be divided into two categories: top-down method and bottom-up method. The top-down method mainly uses arc discharge, l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00
Inventor 周莹钟云倩于姗李意张骞饶志强
Owner SOUTHWEST PETROLEUM UNIV
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