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Method for preparing biomass based carbon quantum dots

A carbon quantum and biomass-based technology, applied in chemical instruments and methods, nanotechnology, nano-optics, etc., can solve the problems of limited performance of carbon quantum dots, high equipment requirements, complicated steps, etc., and achieve good green fluorescence effect, Simple preparation process and wide-ranging effects

Inactive Publication Date: 2015-05-27
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, researchers have disclosed a method for preparing carbon quantum dots by using bio-based materials such as bagasse and egg white as raw materials, and undergoing steps such as high-temperature reactors and plasma treatment. Although this method reduces the cost of raw materials, the steps are cumbersome and require high equipment.
On the other hand, although biomass-based materials have a wide range of sources, it is often limited to directly obtain the properties of carbon quantum dots from materials that have not been pretreated by suitable methods.

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  • Method for preparing biomass based carbon quantum dots
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  • Method for preparing biomass based carbon quantum dots

Examples

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Effect test

Embodiment 1

[0033] Pre-oxidize walnut shells soaked with a catalyst (a mixture of urea and phosphoric acid at a molar ratio of 2:1) in air at 100°C, 150°C, and 250°C for 30 minutes, then place them in a tube-type high-temperature electric furnace, and blow nitrogen Protection, 350°C, 600°C, 800°C for 20 minutes, take it out for later use.

[0034] Weigh 0.3g of carbonized raw material, disperse in a mixture of 20ml of nitric acid and 60ml of concentrated sulfuric acid, and ultrasonicate at room temperature for 2h. Reflux at 80°C for 24 hours, and the concentrated acid mixture quantizes the sheet-layer carbon structure into carbon quantum dots. After the reaction, cool to room temperature, dilute 10 times, adjust the pH of the solution to 7 with sodium carbonate, filter with a 0.22 μm microporous filter head, and dialyze with a 2000 Da dialysis bag for 3 days to remove salt and other components and impurities to obtain yellow fluorescent carbon quantum The aqueous solution of the point, t...

Embodiment 2

[0037] Pre-oxidize walnut shells soaked with a catalyst (a mixture of urea and phosphoric acid at a molar ratio of 2:1) in air at 100°C, 150°C, and 250°C for 30 minutes, then place them in a tube-type high-temperature electric furnace, and blow nitrogen Protection, 350°C, 600°C, 800°C for 20 minutes, take it out for later use.

[0038] Weigh 0.3g of carbonized raw material, disperse in a mixture of 20ml of nitric acid and 60ml of concentrated sulfuric acid, and ultrasonicate at room temperature for 2h. Reflux at 100°C for 24 hours, and the concentrated acid mixture quantizes the sheet-layer carbon structure into carbon quantum dots. After the reaction, cool to room temperature, dilute 10 times, adjust the pH of the solution to 7 with sodium carbonate, filter with a 0.22 μm microporous filter head, and dialyze with a 2000 Da dialysis bag for 3 days to remove salt and other impurities to obtain green fluorescent carbon quantum The aqueous solution of the point, the product size...

Embodiment 3

[0042] Pre-oxidize walnut shells soaked with a catalyst (a mixture of urea and phosphoric acid at a molar ratio of 2:1) in air at 100°C, 150°C, and 250°C for 30 minutes, then place them in a tube-type high-temperature electric furnace, and blow nitrogen Protection, 350°C, 600°C, 800°C for 20 minutes, take it out for later use.

[0043] Weigh 0.3g of carbonized raw material, disperse in a mixture of 10ml of nitric acid and 30ml of concentrated sulfuric acid, and ultrasonicate at room temperature for 2h. Reflux at 80°C for 24 hours, and the concentrated acid mixture quantizes the sheet-layer carbon structure into carbon quantum dots. After the reaction, cool to room temperature, dilute 10 times, adjust the pH of the solution to 1 with sodium carbonate, filter with a 0.22 μm microporous filter head, and dialyze with a 2000 Da dialysis bag for 3 days to remove salt and other components and impurities to obtain yellow fluorescent carbon quantum The aqueous solution of the point, t...

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Abstract

The invention relates to a method for preparing biomass based carbon quantum dots. The method comprises the following steps: carbonizing or activating a biomass material so as to obtain a carbonized product of which the carbon content is greater than or equal to 80%, performing nano quantization on the carbonized product by using a thick acid mixing liquid so as to obtain water-soluble fluorescent carbon quantum dots, changing the reaction temperature so as to adjust the fluorescent color of the carbon quantum dots, and performing retaining separation by using a dialysis bag, thereby obtaining carbon quantum dots in a rectangular diamond cluster about 5nm. Compared with the prior art, the method is wide in raw material source based on natural biomass sources and green and environment-friendly. The chemical oxidation preparation process is simple, and preparation of small-size carbon quantum dots can be easily achieved. The carbon quantum dots are stable in fluorescent effect and good in water solubility, and can be used in fields such as biological imaging.

Description

technical field [0001] The invention belongs to the field of preparation of carbon quantum dots, in particular to a preparation method of biomass-based carbon quantum dots. Background technique [0002] As a new type of nanomaterial, the size of carbon nanodots is less than 20nm, generally spherical or similar, and is considered to be one of the most potential fluorescent materials to replace metal quantum dots. Due to their outstanding fluorescence effect and biocompatibility, especially their application potential in biomarkers and target recognition, carbon quantum dots have broken through the biggest obstacle in the clinical application of semiconductor metal quantum dots in the past. [0003] There are many synthesis methods for carbon quantum dots, which can generally be divided into two categories: top-down synthesis and bottom-up synthesis. The former is based on exfoliating nano-carbon particles from a larger carbon skeleton (such as a carbon target). The synthesis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C01B31/02B82Y40/00B82Y20/00
Inventor 吴琪琳史燕妮夏少旭陈师李敏程朝歌
Owner DONGHUA UNIV
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