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Carbon quantum dot and green preparation method and application thereof

A carbon quantum dot and green technology, applied in the field of carbon quantum dots and their green preparation, can solve problems such as high cost, complex equipment, safety risks and environmental pollution, and achieve low equipment requirements, easy process control, and good biocompatibility. sexual effect

Inactive Publication Date: 2019-02-01
LUOYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] A carbon quantum dot and its green preparation method and application provided by the present invention solve the problem of complex equipment and high cost for the production of CQDs in the prior art; strong acids such as concentrated sulfuric acid and concentrated nitric acid are used in the preparation process, and there are safety risks and environmental problems. pollution problem

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  • Carbon quantum dot and green preparation method and application thereof
  • Carbon quantum dot and green preparation method and application thereof
  • Carbon quantum dot and green preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0033] A green preparation method of carbon quantum dots, specifically comprising the following steps:

[0034] Dissolve 0.1g of soluble starch in 30mL of water, stir and heat to 60°C until completely dissolved, then add 1mL of 1mol / L NaOH solution, continue stirring for 10min after mixing, and place the obtained transparent mixed solution in a 50mL autoclave (i.e. hydrothermal kettle), heated to 200°C, and kept warm for 3 hours to obtain a dispersion; 200W of the dispersion was ultrasonically dispersed for 2 hours, and then centrifuged at a speed of 15,000rpm for 20 minutes to obtain an upper layer solution; the obtained upper layer solution was placed in - Freeze-drying at 70°C for 48 hours can obtain a specific surface area of ​​1321m 2 / g, carbon quantum dots with a particle size of 5-10nm and a purity greater than 99%.

Embodiment 2

[0036] A green preparation method of carbon quantum dots, specifically comprising the following steps:

[0037]Dissolve 0.1g of soluble starch in 30mL of water, stir and heat to 60°C until completely dissolved, then add 1mL of 1mol / L dilute nitric acid solution, mix and continue to stir for 10min, and place the obtained transparent mixed solution in a 50mL autoclave (that is, water hot kettle), heated to 200°C, and kept warm for 3 hours to obtain a dispersion; 200W of the dispersion was ultrasonically dispersed for 2 hours, and then centrifuged at a speed of 15000 rpm for 20 minutes to obtain an upper layer solution; the obtained upper layer solution was used A dialysis bag with a molecular weight cut-off of 1000Da was used for dialysis separation, placed in distilled water for dialysis for 6 days, and the water was not changed during the dialysis process. The solution outside the dialysis bag was collected to obtain a carbon quantum dot solution; the obtained carbon quantum do...

Embodiment 3

[0039] A green preparation method of carbon quantum dots, specifically comprising the following steps:

[0040] Dissolve 0.1g of carboxymethyl cellulose in 30mL of water, stir and heat to 70°C until completely dissolved, then add 1mL of 1mol / L NaOH solution, mix and continue stirring for 10min, and place the obtained transparent mixed solution in a 50mL autoclave ( (i.e., sealed in a hydrothermal kettle), heated to 180°C, and kept warm for 5 hours to obtain a dispersion; 200W of the dispersion was ultrasonically dispersed for 2 hours, and then centrifuged at a speed of 15000rpm for 10 minutes to obtain an upper layer solution; the obtained upper layer The solution was separated by dialysis with a dialysis bag with a molecular weight cut-off of 1000Da, placed in 30ml of distilled water for dialysis for 6 days, no need to change the water during the dialysis process, and the solution outside the dialysis bag was collected to obtain a carbon quantum dot solution. The fluorescence...

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Abstract

The invention belongs to the technical field of nanometer materials, and particularly relates to a carbon quantum dot and a green preparation method and application thereof. The preparation method includes: dissolving natural macromolecular carbohydrates or derivatives thereof in water, mixing with a dilute acid aqueous solution or a dilute alkali aqueous solution, heating with stirring to obtaina mixed solution; heating the obtained mixed solution in a sealed autoclave and preserving heat to obtain dispersion liquid; subjecting the obtained dispersion liquid to ultrasonic dispersion and centrifugal separation to obtain upper-level solution which is an operational carbon quantum dot solution. The preparation method of the carbon quantum dot is simple, low in equipment requirements and easy for mass production, no organic solvent is used in a whole process, no pollution is generated, and the prepared carbon quantum dot can be used for cell marking, optical imaging, medicine transporting, biosensing and the like.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a carbon quantum dot and its green preparation method and application. Background technique [0002] Carbon quantum dots (CQDs, Carbon quantum dots) are small-sized carbon nanoparticles with strong photoluminescence properties, good stability and biocompatibility. Compared with traditional semiconductor quantum dots, they have strong safety It has been widely used in biomedical fields, such as cell labeling, optical imaging, drug delivery, and biosensing, and can also be applied to light-emitting diodes, photoinitiation, and photocatalysis. [0003] Synthetic methods of CQDs are generally divided into two categories, namely “top-down” and “bottom-up” methods. The "top-down" method is to decompose larger carbon materials such as nanodiamonds, graphite, carbon nanotubes, carbon black, activated carbon, and oxidized carbon by arc discharge, laser ablation, electro...

Claims

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Application Information

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IPC IPC(8): C01B32/15C09K11/65B82Y20/00
CPCB82Y20/00C09K11/65C01B32/15
Inventor 张丽雷张静晓原丽丽
Owner LUOYANG NORMAL UNIV
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