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Acidic carbon quantum dot, preparation method and application thereof

A carbon quantum dot and acidic technology, which is applied in the field of acidic carbon quantum dots and its preparation, can solve the problems of environmental pollution and low conversion rate, and achieve the effects of no three wastes, improved particle size, and environmentally friendly raw materials

Active Publication Date: 2020-11-06
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at problems such as low conversion rate and environmental pollution in the process of preparing furfural by degrading lignocellulose, the present invention provides an acidic carbon quantum dot and its preparation method and application

Method used

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  • Acidic carbon quantum dot, preparation method and application thereof
  • Acidic carbon quantum dot, preparation method and application thereof
  • Acidic carbon quantum dot, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0030] A preparation method of acidic carbon quantum dots, comprising the steps of:

[0031] S1: Mix L-phenylalanine and methanesulfonic acid (6.46g in total) with a substance ratio of 1:3 into a 100mL three-necked flask and raise the temperature to 110°C. After 2 hours of reaction, a uniform transparent solution is obtained. That is, the deep eutectic solvent A;

[0032] S2: Add 1g of deep eutectic solvent A and 30mL of distilled water into the hydrothermal kettle, put the hydrothermal kettle into an oven, and react at 210°C for 14h. Freeze-drying for 30 h to obtain acidic carbon quantum dots A.

[0033] Using the above-mentioned acidic carbon quantum dots A to catalyze the hydrolysis of cellulose to prepare furfural, the specific method includes the following steps:

[0034] Mix 1 g of absorbent cotton (100% cellulose content), 0.10 g of acidic carbon quantum dots A and 3 g of distilled water, and conduct a photocatalytic reaction at 110° C. for 6 h under natural light. A...

Embodiment 2

[0036] A preparation method of acidic carbon quantum dots, comprising the steps of:

[0037] S1: Mix p-aminophenylacetic acid and p-toluenesulfonic acid (total 8.39g) with a substance ratio of 1:2 into a 100mL three-necked flask and heat up to 120°C. After 1.5h of reaction, a uniform transparent solution is obtained. That is, the deep eutectic solvent B;

[0038] S2: Add 1g of deep eutectic solvent B and 35mL of distilled water into the hydrothermal kettle, put the hydrothermal kettle into an oven, and react at 200°C for 10h. Freeze-drying for 48 hours to obtain acidic carbon quantum dots B.

[0039] Using the above-mentioned acidic carbon quantum dots B to catalyze the hydrolysis of cellulose to prepare furfural, the specific method includes the following steps:

[0040] 1 g of corn stalks (88% cellulose content), 0.04 g of acidic carbon quantum dots B and 3 g of distilled water were mixed, and a photocatalytic reaction was carried out at 100° C. for 4 h under visible light...

Embodiment 3

[0042] A preparation method of acidic carbon quantum dots, comprising the steps of:

[0043] S1: Mix D-p-hydroxyphenylglycine and formic acid (total 8.54g) with a substance ratio of 1:0.5 and add it into a 100mL three-necked flask and raise the temperature to 60°C. After 2 hours of reaction, a uniform transparent solution is obtained, that is, low Eutectic solvent C;

[0044] S2: Add 1 g of deep eutectic solvent C and 25 mL of distilled water into the hydrothermal kettle, put the hydrothermal kettle in an oven, and react at 220°C for 8 hours. Freeze-drying for 24 hours to obtain acidic carbon quantum dots C.

[0045] Using the above-mentioned acidic carbon quantum dots C to catalyze the hydrolysis of cellulose to prepare furfural, the specific method includes the following steps:

[0046]Mix 1 g of rice husk (42% cellulose content), 0.01 g of acidic carbon quantum dots C and 3 g of distilled water, and conduct a photocatalytic reaction at 80° C. for 1.5 h under visible light...

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Abstract

The invention relates to the technical field of carbon quantum dot and cellulose conversion, and particularly discloses an acidic carbon quantum dot, a preparation method and application thereof. Thepreparation method comprises the following steps of: mixing aromatic amino acid and strong protonic acid for reaction to generate a eutectic solvent; and carrying out hydrothermal reaction on the eutectic solvent and water to obtain the acidic carbon quantum dot. The preparation method provided by the invention is green and environment-friendly, and low in cost, the obtained acidic carbon quantumdot has characteristics of uniform particle size, good dispersibility and high catalytic activity, and contains a large amount of aromatic ring structures, active amino groups and strong acidic functional groups on the surface, so that the carbon quantum dot has excellent catalytic property while having strong acidity, cellulose can be directly converted into furfural, and efficient conversion ofcellulose into furfural is achieved.

Description

technical field [0001] The invention relates to the technical field of carbon quantum dots and cellulose conversion, in particular to an acidic carbon quantum dot and its preparation method and application. Background technique [0002] With the decrease of fossil resources and the use of fossil fuels, CO 2 The impact of emissions on the earth's climate is becoming more and more serious. If we continue to rely on fossil resources, human beings will face serious consequences of energy crisis. Therefore, many studies are being devoted to exploring and developing non-fossil carbon energy sources. Among them, the development of biorefinery technology using lignocellulose as raw material is considered to be one of the most promising alternatives. [0003] Furfural, an important platform compound, is obtained from the hydrolysis of hemicellulose contained in lignocellulose, but cannot be synthesized by chemical methods. Furfural can not only be directly converted into biofuels ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15C09K11/65B82Y20/00B82Y40/00B01J21/18B01J37/10C07D307/48
CPCC01B32/15C09K11/65B82Y20/00B82Y40/00B01J21/18B01J37/10C07D307/48Y02P20/584
Inventor 任红威刘家琦李美玉姜金秋赵明杰刘佳佳翟晨旭
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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