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
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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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