Preparation method of carbon quantum dot
A carbon quantum dot and carbon source technology, applied in the field of carbon quantum dot preparation, can solve the problems of complex preparation process, high toxicity of amine source, high processing cost, etc., and achieve the effects of simplified preparation process, low biological toxicity and stable chemical properties
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[0011] On the one hand, the embodiment of the present invention provides a method for preparing carbon quantum dots, comprising the following steps:
[0012] S01: Provide sugar carbon source and ammonium salt;
[0013] S02: Conduct a solid-phase reaction of the mixed material including the carbohydrate carbon source and the ammonium salt at a reaction environment temperature ≥ 120° C. and under airtight conditions.
[0014] In the process of the preparation method of carbon quantum dots provided by the embodiment of the present invention, sugar is used as a carbon source, and is carbonized in a high temperature (≥120° C.) environment to obtain carbon quantum dots, forming a carbon skeleton of carbon quantum dot materials; and As a nitrogen source, ammonium salt is thermally decomposed under high temperature conditions to produce ammonia gas molecules. In this way, ammonia gas molecules react with carbon quantum dots under high temperature and high pressure, and finally form ni...
Embodiment 1
[0029] (1) Synthesis of nitrogen-doped carbon quantum dots
[0030] Add 1.5g of glucose and 5g of ammonium carbonate into a mortar, grind evenly, and transfer to a 100ml autoclave, put 30g of calcium oxide into a 30ml crucible, carefully transfer to a 100ml autoclave, and tighten the autoclave. Next, the high-pressure reactor was placed in a blast drying oven, and the temperature was rapidly raised to a reaction environment temperature of 130° C., and the reaction environment temperature was kept at a constant temperature for 3 hours. After the reaction, the autoclave was taken out of the blast drying oven, and cooled to room temperature naturally, and the crucible with the water-absorbing agent and the brown-black reaction product were taken out.
[0031] (2) Purification and collection of nitrogen-doped carbon quantum dots
[0032]The brown-black powder was taken out from the autoclave, and transferred to a 100ml beaker, and 50ml of deionized water was added. Place the bea...
Embodiment 2
[0034] (1) Synthesis of nitrogen-doped carbon quantum dots
[0035] Add 1.5g of starch and 5g of ammonium carbonate into a mortar, grind evenly, and transfer to a 100ml autoclave, put 30g of calcium oxide into a 30ml crucible, carefully transfer to a 100ml autoclave, and tighten the autoclave. Next, the high-pressure reactor was placed in a blast drying oven, and the temperature was rapidly raised to a reaction environment temperature of 160° C., and the reaction environment temperature was maintained at a constant temperature for 3 hours. After the reaction, the autoclave was taken out of the blast drying oven, and cooled to room temperature naturally, and the crucible with the water-absorbing agent and the brown-black reaction product were taken out.
[0036] (2) Purification and collection of nitrogen-doped carbon quantum dots
[0037] The brown-black powder was taken out from the autoclave, and transferred to a 100ml beaker, and 50ml of deionized water was added. Place t...
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