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Method for preparing carbon dots with multiple luminescence colors adjusted from coal pitch

A technology of coal quality and asphalt, which is applied in the field of preparing multi-color luminescent adjustable carbon dots, can solve the problems of high cost and low efficiency, and achieve the effect of low cost, wide application and mild conditions

Active Publication Date: 2016-11-30
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems of high cost and low efficiency in the existing preparation of multicolor light-emitting carbon dots, and to provide a method for preparing multicolor light-emitting adjustable carbon dots using coal pitch

Method used

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  • Method for preparing carbon dots with multiple luminescence colors adjusted from coal pitch
  • Method for preparing carbon dots with multiple luminescence colors adjusted from coal pitch
  • Method for preparing carbon dots with multiple luminescence colors adjusted from coal pitch

Examples

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Comparison scheme
Effect test

Embodiment 1

[0033] The method for preparing multi-color luminescent adjustable carbon dots by using coal-based pitch adopts the following steps:

[0034] (1) Get the coal-based pitch solid and put it into a ball mill tank, then carry out ball milling with a planetary ball mill to obtain smaller-sized coal-based pitch powder;

[0035] (2) Get 1 gram of ball-milled coal pitch fine powder and put it into a beaker, then add the mixed solution of 500 gram of formic acid and hydrogen peroxide; : 1 is prepared by mixing;

[0036] (3) Under normal temperature, react for 3 hours under magnetic stirring at a rotating speed of 400 rpm;

[0037] (4) Remove large particles in the solution after the reaction by centrifugation at 10000 rpm to obtain a suspension containing carbon dots;

[0038] (5) Adjust the concentration M of carbon dots in the suspension to obtain different luminous colors: red light when M>1.8g / L; orange light when M=1.7~0.9g / L; orange light when M=0.8~0.4g / L Green light when L; ...

Embodiment 2

[0043] The method for preparing multi-color luminescent adjustable carbon dots by using coal-based pitch adopts the following steps:

[0044] (1) Get the coal-based pitch solid and put it into a ball mill tank, then carry out ball milling with a planetary ball mill to obtain a smaller-sized coal-based pitch powder;

[0045] (2) Get 1 gram of coal pitch fine powder after ball milling and put it into a beaker, then add the mixed solution of 250 gram formic acid and hydrogen peroxide; : 1 is prepared by mixing;

[0046] (3) Under normal temperature, react for 25 hours under magnetic stirring at a rotating speed of 800 rpm;

[0047] (4) Remove large particles in the solution after the reaction by centrifugation at 15000 rpm to obtain a suspension containing carbon dots;

[0048] (5) Adjust the concentration M of carbon dots in the suspension to obtain different luminescent colors: red light when M>1.8g / L; orange light when M=1.7~0.9g / L; orange light when M=0.8~0.4g / L Green ligh...

Embodiment 3

[0051] The method for preparing multi-color luminescent adjustable carbon dots by using coal-based pitch adopts the following steps:

[0052] (1) Get the coal-based pitch solid and put it into a ball mill tank, then carry out ball milling with a planetary ball mill to obtain smaller-sized coal-based pitch powder;

[0053] (2) Take 1 gram of ball-milled fine powder and put it into a beaker, then add 100 grams of formic acid and hydrogen peroxide mixed solution; the mixed solution of formic acid and hydrogen peroxide is mixed by volume of 88% formic acid and 30% hydrogen peroxide by volume be made of;

[0054] (3) Under normal temperature, react for 15 hours under magnetic stirring at a rotating speed of 600 rpm;

[0055] (4) Remove large particles in the solution after the reaction by centrifugation at 13000 rpm to obtain a suspension containing carbon dots;

[0056] (5) Adjust the concentration M of carbon dots in the suspension to obtain different luminous colors: red light...

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Abstract

The invention discloses a method for preparing carbon dots with multiple luminescence colors adjusted from coal pitch. According to the method, coal pitch in a solid state at the room temperature is broken into small pieces through oxidation by virtue of an oxidation reaction, and dehydrogenation and deoxygenation are carried out in reaction heat to convert an organic molecular structure to a graphite carbon structure. Luminous carbon dots are obtained at a high yield through utilization of a mixed liquid of formic acid and hydrogen peroxide. The luminescence colors of the obtained carbon dots are changed with the concentration. According to the method, a reaction can be conducted at the room temperature, and the method is mild in condition and requires no extra energy consumption. The method is abundant in raw materials, low in cost and wide in application.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a method for preparing multicolor luminescence adjustable carbon dots by utilizing coal pitch. Background technique [0002] Due to their good water solubility, easy surface functionalization, biocompatibility, and excellent photoluminescence properties, carbon dots have important application values ​​in the fields of biological detection, labeling, drug carriers, sensors, catalysis, and energy conversion. There are two methods for preparing luminescent carbon dots, one is the top-down method, that is, the nano-sized flake or granular carbon is peeled off from the bulk carbon source; the other is the bottom-up method, that is, Carbonization of small organic molecules to form spheres or flakes of carbon. However, the carbon dots prepared by the existing methods mainly emit blue and green light, and there are few methods for preparing orange and red long-wa...

Claims

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Application Information

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IPC IPC(8): C01B31/02C09K11/65B82Y30/00B82Y20/00
CPCB82Y20/00C01P2004/04C09K11/65
Inventor 胡胜亮孟勋韩雪军常青薛超瑞杨金龙董英鸽
Owner ZHONGBEI UNIV
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