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Lignin-based carbon dots with high fluorescence quantum yield and preparation method of lignin-based carbon dots

A fluorescence quantum yield, lignin-based technology, which is applied in the field of lignin-based carbon dots with high fluorescence quantum yield and its preparation, can solve the problems of low fluorescence quantum yield, harsh operating conditions, and complicated steps, and achieve fluorescence The effect of high quantum yield, low equipment requirements and simple method

Pending Publication Date: 2019-11-12
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0006] In order to overcome the disadvantages and deficiencies in the prior art of preparation of lignin carbon dots, such as harsh operating conditions, complicated steps, high price, and low fluorescence quantum yield, the primary purpose of the present invention is to provide a lignin-based carbon dot with high fluorescence quantum yield. carbon dots

Method used

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  • Lignin-based carbon dots with high fluorescence quantum yield and preparation method of lignin-based carbon dots
  • Lignin-based carbon dots with high fluorescence quantum yield and preparation method of lignin-based carbon dots
  • Lignin-based carbon dots with high fluorescence quantum yield and preparation method of lignin-based carbon dots

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Embodiment 1

[0038] Add 2.40 parts by mass of ethylenediamine to 60 parts by mass of water to form an ethylenediamine solution. Add 0.075 parts by mass of lignin solid powder and 2.10 parts by mass of citric acid monohydrate to the ethylenediamine solution prepared by the above method, and disperse the mixed solution by ultrasonic oscillation for 10 minutes before transferring it to a high-pressure reactor. Raise the temperature to 180°C at a rate of 5°C / min. Under the condition of 180°C, heat it with constant temperature water for 9 hours, take it out, and let it cool down to room temperature naturally. After cooling to room temperature, the reaction product was taken out and centrifuged at 8000 rpm for 10 min. The supernatant liquid was collected, passed through a 0.22 μm filter membrane and dialyzed to remove incompletely reacted substances, and thus obtained carbon dots using lignin as a raw material, and its fluorescence quantum yield was measured to be 43.9%.

Embodiment 2

[0040] Add 1.00 parts by mass of 50% polyethyleneimine (PEI) and 2.40 parts by mass of ethylenediamine to 60 parts by mass of water to form a mixed solution of PEI and ethylenediamine. Add 0.1 parts by mass of solid lignin powder and 2.10 parts by mass of citric acid monohydrate to the mixed solution of PEI and ethylenediamine prepared by the above method, and disperse the mixed solution by ultrasonic oscillation for 8 minutes before transferring it to a high-pressure reactor. Raise the temperature to 200°C at a rate of 5°C / min. Under the condition of 200°C, heat it with constant temperature water for 12 hours, take it out, and let it cool down to room temperature naturally. After cooling to room temperature, the reaction product was taken out and centrifuged at 10000 rpm for 15 min. The supernatant liquid was collected, passed through a 0.22 μm filter membrane and dialyzed to remove incompletely reacted substances, and thus obtained carbon dots using lignin as a raw material,...

Embodiment 3

[0042]Add 0.50 parts by mass of urea to 60 parts by mass of water to form a urea solution. Add 0.10 parts by mass of lignin solid powder and 2.10 parts by mass of citric acid monohydrate to the urea solution prepared by the above method, disperse the mixed solution by ultrasonic oscillation for 18 minutes, and then transfer it to a high-pressure reactor. Raise it to 200°C at a rate of 4°C / min. Under the condition of 200°C, heat it with constant temperature water for 12 hours, take it out, and let it cool down to room temperature naturally. After cooling to room temperature, the reaction product was taken out and centrifuged at 13000 rpm for 18 min. The supernatant liquid was collected, passed through a 0.22 μm filter membrane and dialyzed to remove incompletely reacted substances, and obtained carbon dots using lignin as raw material, and the measured fluorescence quantum yield was 19.2%.

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Abstract

The invention belongs to the technical field of lignin materials, and discloses lignin-based carbon dots with a high fluorescence quantum yield and a preparation method of the lignin-based carbon dots. The lignin-based carbon dots with the high fluorescence quantum yield are obtained by carrying out a hydrothermal reaction on citric acid, lignin and a nitrogen-containing reagent in water. The lignin and the citric acid are utilized to form the fluorescent carbon dots through thermal cracking and carbonization, the fluorescence intensity of the carbon dots is improved through doping or surfacepassivation, and the fluorescence quantum yield of the carbon dots is greatly improved, so that the lignin-based carbon dots with the high fluorescence quantum yield are obtained, and the fluorescencequantum yield can reach 44% at most. The invention also provides a preparation method of the carbon dots. Compared with a plasma synthesis method, a laser ablation method and an arc discharge methodin the prior art, the method provided by the invention has the advantages of cheap and easily available raw materials, mild reaction conditions, a simple method, a high yield, low equipment requirements, a high fluorescence quantum yield and the like, is beneficial to reducing environmental pollution, and has important significance for promoting utilization of renewable resources.

Description

technical field [0001] The invention belongs to the technical field of lignin materials, in particular to a lignin-based carbon dot with high fluorescence quantum yield and a preparation method thereof. Background technique [0002] In nature, the reserve of lignin is second only to cellulose, and it is the only non-petroleum resource that can provide renewable aryl compounds. In the lignocellulosic biomass raw materials, the proportion of lignin is as high as 40%, and the plants in the world produce about 150 billion tons of lignin every year due to photosynthesis. So far, more than 90% of lignin is incinerated or discharged into rivers in the form of black liquor. This not only wastes valuable renewable resources, but also causes serious pollution problems. Therefore, effective utilization of this renewable natural resource has important practical and social significance. [0003] Quantum dots are nanomaterials that emit light of a specific frequency when a certain elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y30/00
CPCB82Y20/00B82Y30/00C09K11/65
Inventor 郑大锋莫振业邱学青杨东杰吕东昊许茹枫
Owner SOUTH CHINA UNIV OF TECH
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