Preparation method of carbon quantum dots

A technology of carbon quantum dots and hydrothermal method, applied in the field of carbon quantum dots processing, can solve problems such as inability to meet, and achieve the effect of eliminating environmental pollution problems

Active Publication Date: 2019-09-13
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The aqueous solution of carbon quantum dots prepared by the current disclosed method is usually transparent yellow, and the color gradually deepens as the concentration increases, and the solution usually appears under the irradiation of an ultraviolet lamp. It is blue and cannot meet the requirements of some experiments

Method used

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  • Preparation method of carbon quantum dots

Examples

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Embodiment 1

[0025] Embodiment 1: In this embodiment, a method for preparing carbon quantum dots is based on corn stalks and methyl methacrylate distillation reaction bottom waste as raw materials, specifically through the following steps:

[0026] Step 1. After crushing the corn stalks, pass through a 60-mesh sieve, weigh 1g of corn stalks and 50g of methyl methacrylate distillation reaction bottom waste, mix them, and put them into a common oven for hydrothermal reaction. The reaction temperature is 100°C. The reaction time is 2;

[0027] Step 2, then add oxalic acid and the pH value is 3;

[0028] Step 3: react at 130°C for 2 hours, and then freeze-dry at minus 50°C for 24 hours to obtain carbon quantum dots.

[0029] The fluorescence spectrum of carbon quantum dots in this embodiment is as follows figure 1 shown by figure 1 It can be seen that the prepared carbon quantum dots emit green fluorescence. Location map of excitation and emission wavelengths figure 1 shown.

Embodiment 2

[0030] Example 2: A method for preparing carbon quantum dots in this example is based on peanut straw and methyl methacrylate distillation reaction bottom waste as raw materials, specifically through the following steps:

[0031] Step 1. After crushing the peanut straw, pass it through a 60-mesh sieve, weigh 1g of peanut straw and 50g of the waste from the bottom of the methyl methacrylate distillation reaction kettle, mix them, and put them into microwave hydrothermal reaction. The reaction temperature is 100°C, and the reaction time is for 30 minutes;

[0032] Step 2, then add 1g of oxidant, then add 1g of hydrogen peroxide, and adjust the pH value to 8 with ammonia water;

[0033] Step 3: React at 150°C for 1 hour, and then freeze-dry at minus 50°C for 24 hours to obtain carbon quantum dots.

Embodiment 3

[0034] Embodiment 3: The preparation method of a kind of carbon quantum dot in this embodiment is to use the mixture of soybean seed coat and mushroom, and the bottom waste of methyl methacrylate distillation reaction tank as raw materials, specifically through the following steps:

[0035] Step 1. After crushing soybean seed coats, pass through a 60-mesh sieve, weigh 0.5g soybean seed coats, 0.5g mushrooms and 60g methyl methacrylate distillation reaction bottom waste, mix them, put them into microwave hydrothermal reaction, and react The temperature is 90°C, and the reaction time is 30 minutes;

[0036] Step 2, then add 2g of hydrogen peroxide, and then add urea to adjust the pH value to 8;

[0037] Step 3, react at 180°C for 0.5h, and then freeze-dry at minus 50°C for 24 hours to obtain carbon quantum dots.

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PUM

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Abstract

The invention discloses a preparation method of carbon quantum dots and belongs to the field of carbon quantum dots processing. The preparation method comprises the following steps: using one of forestry and agricultural residues, kitchen garbage, food and domestic fungus or a mixture of several substances thereof, and waste materials at the bottom of a methyl methacrylate distillation reaction kettle as raw materials, and reacting through a hydrothermal method; then adjusting pH value to 1-5 by adding acid, or adjusting pH value to 8-9 by adding alkali or an oxidizing agent; reacting at 20-180 DEG C, and freeze-drying to obtain carbon quantum dots. The process of the method is simple, harmless and environmentally-friendly, and the environmental pollution problem of the waste materials atthe bottom of the methyl methacrylate distillation reaction kettle is also eliminated.

Description

technical field [0001] The invention belongs to the field of carbon quantum dot processing. Background technique [0002] As a green and non-toxic material, carbon quantum dots have been widely used in photocatalysis, sensors, bioimaging, drug synthesis, gene carriers and other fields. There are usually two methods for the preparation of carbon quantum dots (1) top-down method: arc discharge method, laser ablation method, electrochemical method; (2) bottom-up method: hydrothermal method, template method, combustion method , ultrasonic method, microwave method. [0003] The aqueous solution of carbon quantum dots prepared by the currently disclosed method is usually transparent yellow, and the color gradually deepens as the concentration increases, and the solution usually appears blue under the irradiation of an ultraviolet lamp, which cannot meet the requirements of some experiments. Contents of the invention [0004] The invention uses the waste at the bottom of the me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15C09K11/65B82Y20/00
CPCC01B32/15C09K11/65B82Y20/00
Inventor 史书杰于朝生
Owner NORTHEAST FORESTRY UNIVERSITY
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