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Novel fluorescent carbon quantum dot material and synthesis method and application thereof

A technology of carbon quantum dots and fluorescence, which is applied in the field of fluorescent carbon quantum dot materials and their synthesis, to achieve the effects of short reaction time, short response time, and increased production capacity

Inactive Publication Date: 2021-03-26
CHINA NAT INST OF STANDARDIZATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although new methods of preparation have been continuously proposed, how to precisely control the structure and size of carbon quantum dots is still an unsolved problem.

Method used

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  • Novel fluorescent carbon quantum dot material and synthesis method and application thereof
  • Novel fluorescent carbon quantum dot material and synthesis method and application thereof
  • Novel fluorescent carbon quantum dot material and synthesis method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] . Preparation of carbon quantum dot fluorescent materials:

[0032] In this example, 0.5g of urea was dissolved in 10mL of deionized water, then 1g of apple pomace was added, ultrasonically dissolved for 10min, then transferred to a 50mL polytetrafluoroethylene reactor, and reacted at 200°C for 6h. After cooling to room temperature, solid impurities were removed by dialysis with a 1 kDa dialysis bag to obtain carbon quantum dots.

[0033] . In some other embodiments, the same sample addition and operation steps are adopted as in Example 1, the difference is only that the reaction time is different, and the reaction time can be 5h, 5.5h, 6.5h and 7h.

[0034] In some other embodiments, 0.5g-2g urea can also be dissolved in 10-30mL deionized water, then 1-5g apple pomace is added, ultrasonically dissolved for 10min, and then transferred to a 50mL polytetrafluoroethylene reactor, 200 ℃ reaction 5-7h. After cooling to room temperature, solid impurities were removed by dia...

Embodiment 2

[0040]. Dissolve 1g of urea in 20mL of deionized water, then add 3g of apple pomace, ultrasonically dissolve for 10min, then transfer to a 50mL polytetrafluoroethylene reactor, and react at 200°C for 6.5h. After cooling to room temperature, solid impurities were removed by dialysis with a 1 kDa dialysis bag to obtain carbon quantum dots. The carbon quantum dots were stored at 4°C until use.

Embodiment 3

[0042] . Dissolve 2g of urea in 30mL of deionized water, then add 5g of apple pomace, ultrasonically dissolve for 10min, then transfer to a 50mL polytetrafluoroethylene reactor, and react at 200°C for 6.5h. After cooling to room temperature, solid impurities were removed by dialysis with a 1 kDa dialysis bag to obtain carbon quantum dots. The carbon quantum dots were stored at 4°C until use.

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Abstract

The invention provides a novel fluorescent carbon quantum dot material and a preparation method and application thereof. The prepared fluorescent carbon quantum dot is synthesized from agricultural waste and urea, is in a regular spherical shape, and has the particle size of about 2-10 nm. The fluorescent carbon quantum dot has good fluorescence response to heavy metal mercury ions, is short in response time, low in detection limit and high in selectivity, can be used as a fluorescent probe and can be applied to detection of heavy metal mercury pollutants.

Description

technical field [0001] . The present invention relates to the technical field of fluorescent materials, in particular to a novel fluorescent carbon quantum dot material and its synthesis method and application. Background technique [0002] . Mercury is the only metal that is liquid and easy to flow at room temperature. Mercury ions (Hg 2+ ) is one of the highly toxic heavy metal ions, which can be enriched through the food chain and eventually accumulate in the human body, posing a serious threat to human health and life. Therefore, the detection of trace mercury in the environment is very important. At present, the detection methods mainly include atomic absorption method, atomic fluorescence method, ultraviolet spectrophotometry and so on. It is a hot research topic to choose a detection method with high sensitivity, good selectivity, less dosage and convenient operation. [0003] Fluorescent carbon quantum dots (CQDs) are carbon nanoparticles with a size of less than ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00G01N21/64C01B32/15
CPCC09K11/65B82Y20/00B82Y40/00G01N21/643C01B32/15
Inventor 席兴军兰韬初侨孟玲玲张文焕张晓芳
Owner CHINA NAT INST OF STANDARDIZATION
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