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Preparation method of high-yield lignin-based fluorescence carbon quantum dot

A lignin-based, carbon quantum dot technology is applied in the field of preparation of fluorescent carbon nanomaterials, which can solve the problems of inability to form carbon quantum dots, inability to uniformly disperse, and low yield of carbon quantum dots, and achieve easy industrial production and production. Low cost, improved optical performance

Inactive Publication Date: 2019-05-21
DALIAN POLYTECHNIC UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently reported carbon quantum dot preparation methods have certain limitations in terms of carbon source cost, product yield and optical properties, especially in terms of product yield. The current preparation method generally has a low yield of carbon quantum dots. , mostly less than 10%
However, most of the lignin is insoluble in water, so that it cannot be uniformly dispersed in the hydrothermal reaction. Most of the raw materials are deposited at the bottom of the reaction kettle under high temperature and high pressure and carbonized irregularly, which cannot form carbon quantum dots. Therefore, Choosing a reasonable method to improve the quantum efficiency while increasing the product yield is a technical bottleneck in the application of lignin in the field of carbon quantum dot preparation

Method used

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  • Preparation method of high-yield lignin-based fluorescence carbon quantum dot
  • Preparation method of high-yield lignin-based fluorescence carbon quantum dot
  • Preparation method of high-yield lignin-based fluorescence carbon quantum dot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take a 25mL beaker, weigh 1g of pre-hydrolyzed lignin, disperse it in 10mL of ultrapure water under magnetic stirring, add 0.3g of ethylenediamine and 0.4g of formaldehyde solution in sequence, and react in a closed room at room temperature for 24 hours. Rotary evaporation for 20 minutes, and then vacuum drying at 45°C to obtain a brown powder; dissolve the brown powder in 10g of water and stir thoroughly, and hydrothermally react at 200°C for 24 hours to obtain a crude product; centrifuge after ultrasonic treatment to obtain a supernatant ; Obtain nitrogen-doped lignin-based fluorescent carbon quantum dot powder after dialysis and drying. The yield of the carbon quantum dots obtained by the reaction is 33±0.5% relative to the brown powder obtained after the raw material treatment, and the fluorescence quantum efficiency is 22.7%.

[0029] Tests with a fluorescence spectrophotometer show that the highest fluorescence intensity peak of the prepared carbon quantum dots is...

Embodiment 2

[0031] Take a 25mL beaker, weigh 1g of ground wood lignin, disperse it in 10mL of ultrapure water under magnetic stirring, add 0.3g of ethylenediamine and 0.4g of formaldehyde solution in sequence, and react in a closed manner at room temperature for 24 hours. Rotary evaporation for 20 minutes, and then vacuum drying at 45°C to obtain a brown powder; dissolve the brown powder in 10g of water and stir thoroughly, and hydrothermally react at 240°C for 20 hours to obtain a crude product; centrifuge after ultrasonic treatment to obtain a supernatant ; Obtain nitrogen-doped lignin-based fluorescent carbon quantum dot powder after dialysis and drying. The yield of the carbon quantum dots obtained by the reaction is 31±0.5% relative to the brown powder obtained after the raw material treatment, and the fluorescence quantum efficiency is 22.3%.

Embodiment 3

[0033] The reaction raw material is enzymatic lignin, and the others are consistent with Example 2. The yield of the carbon quantum dot obtained by the reaction is 33±0.5% relative to the brown powder obtained after the raw material treatment, and the fluorescence quantum efficiency is 23.7%.

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Abstract

The invention relates to a preparation method of a high-yield lignin-based fluorescence carbon quantum dot and belongs to the technical field of preparation of a fluorescence carbon nano material. Thepreparation method of the high-yield lignin-based fluorescence carbon quantum dot comprises the steps that water-insoluble lignin is dispersed in deionized water, then the mixed solution is mixed with ethylenediamine and formaldehyde, sealing stirring is conducted for 24 h at the normal temperature, through rotary evaporation treatment, vacuum drying is conducted, and brown powder is obtained; after the brown powder is dissolved in water, a hydrothermal reaction is conducted at the temperature of 200-240 DEG C for 20-24 h, and a rough product is obtained; the rough product is subjected to ultrasonic treatment and then subjected to centrifugal separation, and a supernate is obtained; after dialysis drying, nitrogen-doped lignin-based fluorescence carbon quantum dot powder is obtained. According to the method, with low-price lignin as a carbon source, the technology is simple and stable, the production cost is low, the method is environmentally friendly, the product yield is high, the quantum dot has excellent optical performance, industrial production is easily achieved, and an extremely potential approach is provided for high-value utilization of the lignin.

Description

technical field [0001] The invention relates to a high-yield preparation method of lignin-based fluorescent carbon quantum dots, belonging to the technical field of preparation of fluorescent carbon nanometer materials. Background technique [0002] In recent years, carbon quantum dots, as a new type of fluorescent nanoparticles, have received extensive attention and research due to their unique fluorescent properties, good biocompatibility and low toxicity; compared with traditional metal quantum dots, their low toxicity makes them suitable for biological Imaging, biosensing and other fields have an irreplaceable position. The currently reported carbon quantum dot preparation methods have certain limitations in terms of carbon source cost, product yield and optical properties, especially in terms of product yield. The current preparation method generally has a low yield of carbon quantum dots. , most of which are less than 10%. Therefore, choosing a rich carbon source to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y30/00B82Y40/00
Inventor 郭延柱杨晓旭肖领平陈小红孙润仓韩颖周景辉韩佳
Owner DALIAN POLYTECHNIC UNIVERSITY