A kind of carbon quantum dot and its preparation method and application

A carbon quantum dot and carbon cloth technology, applied in the field of carbon quantum dot preparation, can solve the problems of inability to prepare hetero-element modification and passivation, difficulty in separation and purification of carbon quantum dots, unfavorable industrialized mass production, etc., so as to reduce the preparation cost and yield. The effect of improving and improving productivity

Active Publication Date: 2022-07-19
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0002] At present, the preparation methods of carbon dots are mainly divided into two categories, bottom-up method and top-down method. The bottom-up method is to polymerize small molecular carbon sources into carbon quantum dots, which are mainly divided into microwave method, template method, hydrothermal method, etc. Among them, the separation and purification of carbon quantum dots prepared by the microwave method is difficult, and the use of the template method needs to separate the template, and the hydrothermal method is not conducive to industrial mass production.
The top-down method refers to the etching of macromolecular carbon sources into small molecular carbon quantum dots, mainly including arc discharge method, chemical oxidation method, electrochemical oxidation method, etc. Among them, the arc discharge method has the disadvantage of high impurities and low yield. The chemical oxidation method will produce a large amount of waste acid and pollute the environment, while the electrochemical oxidation method has a high yield and the particle size can be adjusted. At present, the electrochemical oxidation mainly uses industrial graphite rods, carbon black, etc. as electrodes, and these electrode materials are all free. Doped pure carbon materials, the prepared carbon quantum dots are also undoped carbon quantum dots, which brings certain limitations in practical applications, and it is impossible to prepare carbon quantum dots modified and passivated by heteroelements

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  • A kind of carbon quantum dot and its preparation method and application
  • A kind of carbon quantum dot and its preparation method and application
  • A kind of carbon quantum dot and its preparation method and application

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Experimental program
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Embodiment 1

[0090] This embodiment provides a method for preparing nitrogen-doped carbon quantum dots, wherein the method includes:

[0091] 1) Weigh 25.5 mg of nitrogen-doped porous carbon, mix 4.5 μL of PTFE binder, add it into a mortar, add 2 mL of ethanol, grind until a uniformly dispersed dispersion slurry is formed, and then directly coat it on a 2cm×2cm On carbon cloth, dry at 80°C for 12h to obtain electrodes;

[0092] 2) The electrode obtained in step 1) is used as the anode, the graphite rod is used as the counter electrode, and the sodium hydroxide ethanol aqueous solution (which is prepared by 30mgNaOH, 35mL ethanol and 8ml deionized water, wherein, the deionized water at 24 ° C is prepared. The resistivity is 18.25MΩ / cm) as the electrolyte, the DC power supply is turned on, the voltage is adjusted to 5V, and after electrolysis for 36h, the electrolyte containing nitrogen-doped carbon quantum dots is obtained;

[0093] 3) Use a 0.22 μm microporous membrane to filter to remove...

Embodiment 2

[0096] This embodiment provides a method for preparing iron-nitrogen-doped carbon quantum dots, wherein the method differs from Embodiment 1 only in that the carbon material used is iron-nitrogen-doped porous carbon (instead of nitrogen-doped porous carbon), and other All are the same as the preparation method of Example 1.

[0097] Wherein, the preparation method of the iron-nitrogen-doped porous carbon is: adding 0.5 mmol of FeCl 3 ·6H 2 O, 1.5mmol of 1,10-phenanthroline and 1g of MgO template agent were dissolved in 100mL of ethanol and stirred for 12h, and the ethanol solvent was removed by rotary evaporation to obtain solid powder; / min) black solid powder obtained by calcination in argon atmosphere for 2 hours; the obtained black solid powder was dispersed in 100 mL of dilute hydrochloric acid with a concentration of 1 mol / L, stirred at 80 °C for 2 hours to remove unstable iron particles generated on the surface, and then dried for 6 hours An iron-nitrogen-doped porous...

Embodiment 3

[0099] This embodiment provides a method for preparing carbon quantum dots, wherein the method differs from Embodiment 1 only in that the carbon material used is undoped porous carbon (instead of nitrogen-doped porous carbon), and the others are the same as those of Embodiment 1. The preparation method is the same.

[0100] Wherein, the preparation method of the undoped porous carbon is as follows: dissolving 1.5 mmol of triphenylmethane and 1 g of MgO template agent in 100 mL of ethanol, stirring for 12 h, and removing the ethanol solvent by rotary evaporation to obtain solid powder; Black solid powder obtained by calcining in argon atmosphere at 800°C (heating rate of 10°C / min) for 2h; disperse the obtained black solid powder in 100mL of dilute hydrochloric acid with a concentration of 1mol / L, and stir at room temperature for 30min to remove the MgO template agent , and then dried for 6 h to obtain undoped porous carbon.

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Abstract

The invention provides a carbon quantum dot and a preparation method and application thereof. The preparation method includes: 1) compounding the carbon material on the carbon cloth to prepare an electrode; 2) using the electrode as an anode to perform electrolysis in an electrolyte to prepare carbon quantum dots. The nitrogen-doped carbon quantum dots prepared by the above-mentioned preparation method can be applied to the detection of iron ions; the obtained iron-nitrogen-doped carbon quantum dots prepared by the above-mentioned preparation method can be applied to the detection of copper ions. The above-mentioned preparation method utilizes carbon cloth smear as anodic electrolytic oxidation stripping to prepare carbon quantum dots, which is suitable for the preparation of both undoped carbon quantum dots and doped carbon quantum dots, and has a high yield of carbon quantum dots. .

Description

technical field [0001] The invention relates to the scientific field of carbon nanomaterials, in particular to a method for preparing carbon quantum dots which can be reused to prepare carbon quantum dots by using carbon cloth coating sheets. Background technique [0002] At present, the preparation methods of carbon dots are mainly divided into two categories, bottom-up method and top-down method. The bottom-up method is to aggregate small molecular carbon sources into carbon quantum dots, which are mainly divided into microwave method, template Among them, the separation and purification of carbon quantum dots prepared by the microwave method is difficult, the template method needs to separate the template, and the hydrothermal method is not conducive to industrial mass production. The top-down method refers to the etching of macromolecular carbon sources into small molecular carbon quantum dots, mainly including arc discharge method, chemical oxidation method, electrochem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/15C09K11/65B82Y40/00
CPCC01B32/15C09K11/65B82Y40/00
Inventor 杨帆鲍伟杰李永峰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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