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A kind of sulfur-doped fluorescent carbon quantum dot and its preparation method and application

A carbon quantum dots, sulfur doping technology, applied in fluorescence/phosphorescence, chemical instruments and methods, luminescent materials, etc., to achieve the effect of simple process, low production cost, and improved fluorescence quantum efficiency

Active Publication Date: 2021-08-13
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently reported carbon sources for the preparation of carbon quantum dots have certain limitations in terms of cost and biological toxicity. Quantum dots come into focus

Method used

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  • A kind of sulfur-doped fluorescent carbon quantum dot and its preparation method and application
  • A kind of sulfur-doped fluorescent carbon quantum dot and its preparation method and application
  • A kind of sulfur-doped fluorescent carbon quantum dot and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Take a 25mL beaker, weigh 0.1g of calcium lignosulfonate, dissolve it in 9mL of ultrapure water under magnetic stirring, place the reaction solution in an ultrasonic cell pulverizer, sonicate the probe for 10min, and mix the sonicated Transfer the liquid to a 100mL polytetrafluoroethylene autoclave, rinse the beaker with 1mL of ultrapure water and pour it into the autoclave. Add 3g of concentrated sulfuric acid into the mixture, seal it well, put it into an intelligent oil bath for heating, react at 200°C for 7 hours, cool to room temperature naturally after the reaction, take out the reaction solution in the autoclave, and react The liquid is light yellow suspension with the smell of carbide and carbon residue at the bottom. Put the reaction solution into a beaker and ultrasonically clean it for 20 minutes in an ultrasonic cleaner; then pour the reaction solution into a 10 mL centrifuge tube for high-speed centrifugation at a speed of 10,000 rpm / min for 10 minutes to c...

Embodiment 2

[0034] Take a 25mL beaker, weigh 0.075g of pre-hydrolyzed lignin, dissolve it in 9mL of ultrapure water under magnetic stirring, place the reaction solution in an ultrasonic cell pulverizer, ultrasonicate the probe for 10min, and dissolve the ultrasonically mixed solution Transfer to a 100mL polytetrafluoroethylene autoclave, rinse the beaker with 1mL of ultrapure water and pour it into the autoclave. Add 3g of concentrated sulfuric acid into the mixture, seal it well, put it into an intelligent oil bath for heating, and react at 220° C. for 11 hours, and the others are consistent with Example 1.

Embodiment 3

[0036] The reaction raw material is ground wood lignin, and the others are consistent with Example 2.

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Abstract

The invention relates to a sulfur-doped fluorescent carbon quantum dot and its preparation method and application, belonging to the technical field of preparation and application of fluorescent carbon nanomaterials. A method for preparing sulfur-doped fluorescent carbon quantum dots, comprising dispersing lignin or lignin derivatives in water, mixing them with concentrated sulfuric acid, and performing a hydrothermal reaction at 200-220°C for 7-11 hours to obtain a crude product; The crude product is subjected to ultrasonic treatment and centrifuged to obtain a supernatant liquid; the obtained supernatant liquid is subjected to dialysis treatment to obtain a solid product, which is dried to obtain a sulfur-doped fluorescent carbon quantum dot powder. The preparation method of high-performance sulfur-doped fluorescent carbon quantum dots provided by the present invention uses extremely cheap lignin as a carbon source. The process is simple and stable, and the production cost is low. Value-based utilization provides a path with great potential.

Description

technical field [0001] The invention relates to a sulfur-doped fluorescent carbon quantum dot and its preparation method and application, belonging to the technical field of preparation and application of fluorescent carbon nanomaterials. Background technique [0002] In recent years, food safety has received more and more attention from all walks of life, and toxic substances such as Sudan red dye have been used as food additives to aggravate the severe food safety situation. Sudan red is a lipophilic azo compound, which will produce aniline toxic substances during the degradation process, which has obvious toxic effects on human liver and kidney organs, and is a carcinogen. It is mainly used to enhance the color of industrial solvents such as petroleum and engine oil, and also used to enhance the luster of shoes and floors. However, due to its bright dyeing, non-fading, and cheap characteristics, it is illegally used as a food additive by unscrupulous merchants, endangerin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y30/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/65G01N21/643
Inventor 郭延柱杨晓旭陈腾飞孙润仓周景辉
Owner DALIAN POLYTECHNIC UNIVERSITY