A potassium-nitrogen co-doped carbon dot based on steamer peel and its preparation method and application
A co-doping, peeling technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, fluorescence/phosphorescence, etc., can solve problems such as inability to achieve, achieve energy saving, high fluorescence quantum yield, The effect of easy availability of raw materials
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Embodiment 1
[0029] 1) 0.5g of discarded fire wheel peel was placed in a beaker, 8mL of ultrapure water was added, and 8mL of ethylenediamine was added to the solution, and after ultrasonic treatment, a mixed solution was obtained;
[0030] 2) The above mixed solution was placed in an autoclave, and hydrothermally reacted at 150°C for 3h;
[0031] 3) When the reaction is stopped, the reactor is naturally cooled to room temperature, and filtered with filter paper to remove the large particles in the solution after the reaction; after that, the dark brown filtrate is further filtered through a cylindrical membrane filter (0.22 μm) to obtain Potassium and nitrogen co-doped carbon dots aqueous solution prepared from the peel of the steamer;
[0032] 4) The above-mentioned carbon quantum dot aqueous solution was stored in a 4° C. refrigerator for later use, and the relative quantum yield (with quinine sulfate as the standard) was 15%.
[0033] Characterization and application of potassium-nitr...
Embodiment 2
[0035] 1) 0.5g of discarded fire wheel peel was placed in a beaker, 8mL of ultrapure water was added, and 8mL of ethylenediamine was added to the solution, and after ultrasonic treatment, a mixed solution was obtained;
[0036] 2) The above mixed solution was placed in an autoclave, and hydrothermally reacted at 150°C for 2h;
[0037] 3) When the reaction is stopped, the reactor is naturally cooled to room temperature, and filtered with filter paper to remove the large particles in the solution after the reaction; after that, the dark brown filtrate is further filtered through a cylindrical membrane filter (0.22 μm) to obtain Potassium and nitrogen co-doped carbon dots aqueous solution prepared from the peel of the steamer;
[0038] 4) The above-mentioned carbon quantum dot aqueous solution was stored in a 4° C. refrigerator for later use, and the relative quantum yield (based on quinine sulfate) was 12.6%.
Embodiment 3
[0040] 1) 0.5g of discarded fire wheel peel was placed in a beaker, 8mL of ultrapure water was added, and 8mL of ethylenediamine was added to the solution, and after ultrasonic treatment, a mixed solution was obtained;
[0041] 2) The above mixed solution was placed in an autoclave, and hydrothermally reacted at 150°C for 4h;
[0042] 3) When the reaction is stopped, the reactor is naturally cooled to room temperature, and filtered with filter paper to remove the large particles in the solution after the reaction; after that, the dark brown filtrate is further filtered through a cylindrical membrane filter (0.22 μm) to obtain Potassium and nitrogen co-doped carbon dots aqueous solution prepared from the peel of the steamer;
[0043] 4) The above-mentioned carbon quantum dot aqueous solution was stored in a 4° C. refrigerator for later use, and the relative quantum yield (based on quinine sulfate) was 13%.
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