Microalgae-based nano carbon quantum dot solid powder as well as preparation method and application thereof

A technology of solid powder and carbon quantum dots, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problem of uneven particle size distribution of carbon quantum dots, poor stability of carbon quantum dots, and low fluorescence quantum yield and other problems, to achieve the effect of high production efficiency, cheap raw materials, and good luminescence stability

Pending Publication Date: 2021-06-29
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The microwave method is easy to operate, fast in speed, and high in fluorescence quantum yield, but the particle size distribution of carbon quantum dots is uneven, and separation and purification are difficult
The template method can effectively prevent particle agglomeration and control the size of carbon quantum dots, but the operation is more complicated
The combustion method is easy to operate and low in preparation cost, but the stability of the obtained carbon quantum dots is not good, and the fluorescence quantum yield is low

Method used

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  • Microalgae-based nano carbon quantum dot solid powder as well as preparation method and application thereof
  • Microalgae-based nano carbon quantum dot solid powder as well as preparation method and application thereof
  • Microalgae-based nano carbon quantum dot solid powder as well as preparation method and application thereof

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Embodiment 1

[0035] see figure 1 , a preparation method of microalgae-based nano-carbon quantum dot solid powder, the steps are as follows:

[0036] Step 1: Add 1.5g of dry chlorella powder and 25g of deionized water into the reactor, close the reactor, open the inlet valve, and let in nitrogen to replace the air in the reactor.

[0037] Step 2: Magnetic stirring at 250r / min and hydrothermal reaction at 230°C. During the hydrothermal carbonization process, functional groups such as nitrogen and sulfur contained in chlorella combine with functional groups on the surface of carbon quantum dots to form nitrogen-doped , Sulfur fluorescent nano-carbon material; after hydrothermal carbonization for 6 hours, stop heating. After cooling to about 150°C, rinse and cool the reactor body with flowing cold water.

[0038] Step 3: Open the reaction kettle, pour the reaction mixture into a centrifuge tube, and centrifuge at 8000r / min for 20min.

[0039]Step 4: Pour the upper liquid obtained after cent...

Embodiment 2

[0043] A preparation method of microalgae-based nano carbon quantum dot solid powder is carried out as follows:

[0044] Step 1: Take 26.5g of chlorella algae pulp aqueous solution (the mass ratio of water to chlorella is 20:1) into the reactor, close the reactor, open the air inlet valve, let in nitrogen, and replace the air in the reactor.

[0045] Step 2: Magnetic stirring at 250r / min and hydrothermal reaction at 230°C. During the hydrothermal carbonization process, functional groups such as nitrogen and sulfur contained in chlorella combine with functional groups on the surface of carbon quantum dots to form nitrogen-doped , Sulfur fluorescent nano-carbon material; after hydrothermal carbonization for 2 hours, stop heating. After cooling to about 150°C, rinse and cool the reactor body with flowing cold water.

[0046] Step 3: Open the reaction kettle, pour the reaction mixture into a centrifuge tube, and centrifuge at 8000r / min for 20min.

[0047] Step 4: Pour the upper ...

Embodiment 3

[0053] A preparation method of microalgae-based nano carbon quantum dot solid powder is carried out as follows:

[0054] Step 1: Add 1.5g of dry chlorella powder and 25g of deionized water into the reactor, close the reactor, open the inlet valve, and let in nitrogen to replace the air in the reactor.

[0055] Step 2: Magnetic stirring at 250r / min and hydrothermal reaction at 230°C. During the hydrothermal carbonization process, functional groups such as nitrogen and sulfur contained in chlorella combine with functional groups on the surface of carbon quantum dots to form nitrogen-doped , Sulfur fluorescent nano-carbon material; stop heating after hydrothermal carbonization for 10 hours. After cooling to about 150°C, rinse and cool the reactor body with flowing cold water.

[0056] Step 3: Open the reaction kettle, pour the reaction mixture into a centrifuge tube, and centrifuge at 6000-8000 r / min for 20-40 minutes.

[0057] Step 4: Pour the upper liquid obtained after centr...

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Abstract

The invention discloses microalgae-based nano carbon quantum dot solid powder as well as a preparation method and an application thereof. The preparation method of microalgae-based nano carbon quantum dot solid powder is characterized in that chlorella is used as a carbon precursor, a nitrogen and sulfur-doped microalgae-based nano carbon quantum dot material is prepared through hydrothermal reaction, centrifugal separation and dialysis treatment, and the preparation method comprises the following specific steps: step 1, adding deionized water and chlorella into a high-pressure reaction kettle at the same time, or directly adding the microalgae slurry mixture into the high-pressure reaction kettle, replacing air in the reaction kettle with nitrogen, and sealing the reaction kettle; and 2, uniformly mixing the stirred materials, carrying out a hydrothermal carbonization reaction, and combining functional groups such as nitrogen and sulfur contained in chlorella with functional groups on the surfaces of the carbon quantum dots in the hydrothermal carbonization process to form microalgae-based nano carbon quantum dots doped with nitrogen and sulfur. The method can be widely applied to the fields of anti-counterfeiting marks, sensors, energy, semiconductors, medicines and the like.

Description

technical field [0001] The invention relates to a nano-carbon material, in particular to a microalgae-based nano-carbon quantum dot solid powder and a preparation method and application thereof. Background technique [0002] Carbon quantum dots are cluster-like zero-dimensional nanomaterials with a diameter of less than 10 nm composed of carbon skeletons. The surface of carbon quantum dots contains a large number of oxygen-containing functional groups, which has good water solubility and is easy to be functionalized. It has optical characteristics such as ultraviolet-visible light absorption characteristics, photoluminescence characteristics, up-conversion fluorescence emission characteristics, and excitation wavelength dependence. Under normal conditions, carbon quantum dots can exist stably in water or high-salt solutions for a long time, and their aqueous solutions can maintain strong fluorescence even after being placed for half a year. Carbon quantum dots are almost o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y30/00G01N21/64C09D7/61
CPCC09K11/65B82Y30/00G01N21/6456G01N21/6428C09D7/61
Inventor 夏奡张敬苗廖强黄云朱贤青朱恂李俊付乾
Owner CHONGQING UNIV
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