Nitrogen-doped carbon dot based on waste tobacco stems, synthetic method and application of carbon dot

A technology of nitrogen-doped carbon dots and a synthesis method, which is applied in the fields of nitrogen-doped carbon dots, nitrogen-doped carbon dots and their synthesis, can solve problems such as pollution of environmental resources, waste, etc., and achieves reduction of resource waste, mild process, and improved efficiency. Effective utilization effect

Active Publication Date: 2019-01-04
CHINA TOBACCO HENAN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limitations of existing technologies, hundreds of thousands of tons of tobacco stems are discarded every year in China, which pollutes the environment and causes a great waste of resources.
At present, there is no report on the preparation of nitrogen-doped carbon dots from waste tobacco stems.

Method used

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  • Nitrogen-doped carbon dot based on waste tobacco stems, synthetic method and application of carbon dot
  • Nitrogen-doped carbon dot based on waste tobacco stems, synthetic method and application of carbon dot
  • Nitrogen-doped carbon dot based on waste tobacco stems, synthetic method and application of carbon dot

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A synthetic method based on nitrogen-doped carbon dots of discarded tobacco stems, comprising the steps of:

[0028] 1) Tobacco stems removed from the shredded leaves by winnowing are taken, washed, freeze-dried, and ground into powder;

[0029] 2) Weigh 0.5 g of tobacco stem powder, add 10 mL of distilled water, transfer it to a 25 mL polytetrafluoroethylene-lined hydrothermal reaction kettle, and conduct a hydrothermal reaction at 200 °C for 10 hours;

[0030] 3) After the reaction, cool down to room temperature naturally, and filter with 15-20 μm qualitative filter paper; the obtained filtrate is dialyzed with a dialysis membrane with a molecular weight cut-off of 100-500 Da for 72 hours to obtain a carbon dot solution;

[0031] 3) The carbon dot solution was concentrated by rotary evaporation and freeze-dried in a freeze dryer to obtain brown nitrogen-doped carbon dot powder.

[0032] Structure and performance characterization of carbon dots.

[0033] (1) Characte...

Embodiment 2

[0042] A synthetic method based on nitrogen-doped carbon dots of discarded tobacco stems, comprising the steps of:

[0043] 1) Mix the washed and dried tobacco stem powder with distilled water according to the ratio of material to liquid: 1g: 10 mL, then hydrothermally react in the reaction kettle at 190°C for 12 hours;

[0044] 2) After the reaction, cool down to room temperature naturally, and filter with 15-20 μm qualitative filter paper; the obtained filtrate is dialyzed with a dialysis membrane with a molecular weight cut-off of 100-500 Da for 72 hours to obtain a carbon dot solution;

[0045] 3) The carbon dot solution is concentrated by rotary evaporation and freeze-dried by a freeze dryer to obtain brown carbon dot powder.

Embodiment 3

[0047] A synthetic method based on nitrogen-doped carbon dots of discarded tobacco stems, comprising the steps of:

[0048] 1) Mix the washed and dried tobacco stem powder with distilled water at a material-to-liquid ratio of 2 g: 10 mL, then hydrothermally react in a reactor at 210°C for 6 hours;

[0049] 2) After the reaction, cool down to room temperature naturally, and filter with 15-20 μm qualitative filter paper; the obtained filtrate is dialyzed with a dialysis membrane with a molecular weight cut-off of 100-500 Da for 72 hours to obtain a carbon dot solution;

[0050] 3) The carbon dot solution is concentrated by rotary evaporation and freeze-dried by a freeze dryer to obtain brown carbon dot powder.

[0051] To sum up, the present invention uses waste stems removed from cigarette production as a carbon source, and prepares nitrogen-doped carbon dots by a one-step hydrothermal method. The surface of the nitrogen-doped carbon dots is rich in functional groups such as ca...

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Abstract

The invention provides a nitrogen-doped carbon dot based on waste tobacco stems, a synthetic method of the carbon dot. The synthetic method includes the steps: taking the waste tobacco stems as a carbon source; taking water as a solvent; performing hydrothermal reaction on the waste tobacco stems and the water in a reaction kettle; performing filtering, dialysis, concentration and drying after reaction is completed to prepare the nitrogen-doped carbon dot. The surface of the nitrogen-doped carbon dot is rich in functional groups such as carboxyl and amidogen, average particle diameter is about4.7nm, water solubility is good, and the carbon dot can emit bright fluorescence under stimulation of ultraviolet light, can stimulate dependent fluorescence emission behaviors and can serve as a fluorescent probe applied to the aspects of biological imaging and the like.

Description

technical field [0001] The invention belongs to the technical field of carbon dot synthesis, and specifically relates to a nitrogen-doped carbon dot based on waste tobacco stems and its synthesis method and application. The method uses waste tobacco stems in cigarette production as a carbon source for the first time and adopts a one-step hydrothermal method Nitrogen-doped carbon dots with excellent luminescent properties were prepared and synthesized. Background technique [0002] Tobacco stems are a by-product of the cigarette industry, accounting for about 25% to 30% of the leaf weight. The content of cell wall substances in tobacco stems is relatively high, mainly including cellulose, hemicellulose, pectin and lignin, in addition to a variety of active ingredients such as nicotine, solanesol, chlorogenic acid, protein and amino acids, etc. High utility value. However, due to the limitations of existing technologies, hundreds of thousands of tons of tobacco stems are dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65G01N21/64
CPCC09K11/65G01N21/6428
Inventor 韩路许克静杜佳许佩李明伟
Owner CHINA TOBACCO HENAN IND
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