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Carbon quantum dot preparation method

A technology of carbon quantum dots and molecular weight cut-off, applied in the field of preparation of carbon quantum dots, can solve problems such as complex fluorescence behavior, and achieve the effect of easy operation

Inactive Publication Date: 2018-08-07
QIDONG CHUANGLYU GREENING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex structure and fluorescence behavior of carbon quantum dots, there is still no unified theory that can well explain the luminescence behavior of carbon quantum dots.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for preparing carbon quantum dots, comprising the steps of: refluxing 20 parts of wood activated carbon with 95 parts of nitric acid with a concentration of 1.5 mol / L, the reaction temperature is 110 ° C, and refluxing for 15 hours. After the reaction is completed, the reaction product is naturally cooled to Room temperature, with Na 2 CO 3 Neutralize, centrifuge at 12000r / min for 22min, repeat 5 times until a yellow-brown clear liquid is obtained, and then dialyze for 4.5d with a dialysis bag with a molecular weight cut-off of 3000Da to obtain a fluorescent carbon quantum dot solution; each raw material is in parts by weight .

Embodiment 2

[0016] A method for preparing carbon quantum dots, comprising the following steps: reflux 15 parts of wood activated carbon with 90 parts of nitric acid with a concentration of 1.5 mol / L, the reaction temperature is 105 ° C, and reflux for 14 hours. After the reaction is completed, the reaction result is naturally cooled to Room temperature, with Na 2 CO 3 Neutralize, centrifuge at 12000r / min for 20min, repeat 4 times until a yellowish-brown clear liquid is obtained, and then dialyze for 4 days with a dialysis bag with a molecular weight cut-off of 3000Da to obtain a fluorescent carbon quantum dot solution; all raw materials are parts by weight.

Embodiment 3

[0018] A method for preparing carbon quantum dots, comprising the following steps: reflux 25 parts of wood activated carbon with 100 parts of nitric acid with a concentration of 1.5 mol / L, the reaction temperature is 115 ° C, and reflux for 16 hours. After the reaction is completed, the reaction product is naturally cooled to Room temperature, with Na 2 CO 3 Neutralize, centrifuge at 12000r / min for 25min, repeat 6 times until a yellow-brown clear liquid is obtained, and then dialyze for 5 days with a dialysis bag with a molecular weight cut-off of 3000Da to obtain a fluorescent carbon quantum dot solution; all raw materials are parts by weight.

[0019] The method is simple, fast and easy to operate, successfully prepares carbon quantum dots with dual fluorescence emission, and can be prepared on a large scale.

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PUM

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Abstract

The invention discloses a carbon quantum dot preparation method which comprises the following steps: utilizing 1.5mol / L nitric acid to back flow wooden activated carbon, setting a reaction temperatureas 105 to 115 DEG C, back flowing for 14 to 16h, naturally cooling a reaction product to a room temperature after reaction finishes, utilizing Na2CO3 to neutralize the reaction product, centrifugingfor 20 to 25min under the condition of 12000r / min, repeating for 4 to 6 times until yellowish-brown clear liquid is obtained and then utilizing a dialysis bag with molecular weight cut off as 3000Da to dialyze the reaction product for 4 to 5d to obtain a fluorescent carbon quantum dot solution. The method has the advantages of convenience, quickness, convenience, easiness in operation, ability insuccessfully preparing carbon quantum dots with dual fluorescence emission and suitability for large-scale preparation.

Description

technical field [0001] The invention relates to a preparation method of carbon quantum dots. Background technique [0002] As a new type of fluorescent nanoparticles, carbon quantum dots not only have excellent fluorescent properties, but also have various preparation methods, cheap raw materials, and are simple and easy to implement. Therefore, they have attracted widespread attention in terms of preparation methods and applications. The preparation methods of carbon quantum dots can be classified into two categories: (1) "top-down method", that is, to "break" macroscopic carbon materials to prepare carbon quantum dots; (2) "bottom-up method", that is, to Organic molecules are polymerized and carbonized to prepare carbon quantum dots. Generally speaking, the "top-down method" is rich in raw materials for preparing carbon quantum dots, such as candle ash, graphite powder, activated carbon, graphite rods, etc. Among them, activated carbon is easier to prepare carbon quantum ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00
CPCC09K11/65B82Y20/00B82Y40/00
Inventor 不公告发明人
Owner QIDONG CHUANGLYU GREENING ENG CO LTD
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