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Nitrogen-doped fluorescent carbon-dot and carbon-dot graphene composite as well as production method and application thereof

A fluorescent carbon dot, nitrogen doping technology, applied in chemical instruments and methods, luminescent materials, chemical/physical processes, etc., can solve the problems of low calorific value, high nitrogen content, large pollution, etc., and achieve a large steady-state current , the effect of high catalytic activity and low start-up potential

Inactive Publication Date: 2014-09-10
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] That is, the technical problem solved by the present invention is: although the existing carbon dots have good fluorescence performance, their catalytic activity still needs to be improved; in addition, the noble metal catalysts of the existing fuel cells are expensive, and the non-noble metal catalysts have relatively low catalytic activity. Develop an electrocatalyst material with low cost and excellent catalytic performance; in addition, the present invention can provide a new utilization method for low-rank coal, and solve the problem of existing low-rank coal, such as low-rank bituminous coal or lignite, which has high nitrogen content , low calorific value and high pollution in the process of power generation

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  • Nitrogen-doped fluorescent carbon-dot and carbon-dot graphene composite as well as production method and application thereof
  • Nitrogen-doped fluorescent carbon-dot and carbon-dot graphene composite as well as production method and application thereof
  • Nitrogen-doped fluorescent carbon-dot and carbon-dot graphene composite as well as production method and application thereof

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preparation example Construction

[0044] In a preferred embodiment of the present invention, regarding the preparation method of nitrogen-doped fluorescent carbon dots, the specific steps are as follows:

[0045] 1. Crush and grind the coal with high nitrogen content, and sieve it to below 200 mesh. The sieve used is a Taylor sieve. Dry it overnight in an oven at 110°C. Take an appropriate proportion of coal powder and coal tar binder, fully knead and stir Uniform, extruded into a rod shape with a diameter of 10mm under the condition of 1-5MPa, and carbonized for 2 hours at 500-1500°C in nitrogen or argon;

[0046] 2. Prepare 0.05-0.2mol / L NaOH solution as the electrolyte, then add 0.1-1mol / L ammonia water, use the above-mentioned coal-based carbon rod as the anode, the platinum sheet as the counter electrode, and the calomel electrode as the reference electrode. Under the bias condition of 2-15V, react for 2-6 hours, collect the electrolyte solution containing a large number of carbon dots, use a 3500Da dialy...

Embodiment 1

[0065] 1. Preparation of nitrogen-doped carbon dots: crush and grind anthracite with high nitrogen content, sieve it to below 200 mesh, dry it in an oven at 110°C overnight, take 100g of coal powder, 50g of coal tar, fully knead, and stir evenly. Extruded into rods with a diameter of 10mm under the condition of 1MPa, carbonized at 900°C in nitrogen for 2 hours; prepared 0.1mol / L NaOH solution as the electrolyte, containing 0.2mol / L ammonia water, and the above coal-based carbon rods As the anode, the platinum sheet is the counter electrode, and the calomel electrode is the reference electrode. React for 2 hours under a bias voltage of 5V, collect the electrolyte containing a large number of carbon dots, and dialyze the electrolyte with a 3500Da dialysis bag to obtain nitrogen. doped carbon dots.

[0066] 2. Catalyst preparation: nitrogen-doped carbon dots and graphite oxide were prepared into a mixed solution at a mass ratio of 1:10, and hydrothermally treated at 180°C for 12 ...

Embodiment 2

[0077] 1. Preparation of nitrogen-doped carbon dots: crush and grind bituminous coal with high nitrogen content, sieve it to below 200 mesh, dry it in an oven at 110°C overnight, take 100g of coal powder and 20g of coal tar binder, and fully knead them. Stir evenly, extrude into a rod shape with a diameter of 10mm under the condition of 5MPa, and carbonize under the condition of 500°C in argon for 2 hours; prepare 0.05mol / L NaOH solution as the electrolyte solution, which contains 0.1mol / L ammonia water, and the above The coal-based carbon rod is used as the anode, the platinum sheet is used as the counter electrode, and the calomel electrode is used as the reference electrode. React for 6 hours under a bias voltage of 2V, collect the electrolyte containing a large number of carbon dots, and use a 3500Da dialysis bag to remove the electrolyte. , that is, nitrogen-doped carbon dots are obtained.

[0078] 2. Preparation of catalyst: Mix nitrogen-doped carbon dots and graphite ox...

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Abstract

The invention relates to the field of a carbon nano material, and provides a nitrogen-doped fluorescent carbon-dot and a carbon-dot graphene composite as well as a production method and an application thereof. The nitrogen-doped fluorescent carbon dot is characterized in that the nitrogen element exists in the form of pyridine nitrogen, pyrrole nitrogen and graphitic nitrogen; the nitrogen atom and carbon atom are in a molar ratio of 0.035 to 0.057; the average granularity is 2.5nm to 4.1nm. The invention also provides a preparation method of a fluorescent carbon dot. The preparation method comprises the following steps: (1) carbonizing coal with high content of nitrogen to obtain a carbonized material, wherein the coal with high nitrogen content refers to the coal with the nitrogen content of 1.1 to 3.0 percent; (2) producing an anode through the obtained carbonized material, and electrochemically oxidizing the anode to obtain the fluorescent carbon dot. The invention also provides a carbon-dot-graphene composite material prepared through the nitrogen-doped fluorescent carbon dot. In addition, the invention also provides an application of the fluorescent carbon dot in the fields such as photoelectric devices, biological imaging, oxidation-reduction electric catalyst, detection and sensing and an application of an oxidation-reduction electrochemical catalyst in the field of a fuel battery.

Description

technical field [0001] The invention relates to the field of carbon nanomaterials, in particular to a nitrogen-doped fluorescent carbon dot with coal as a carbon source, a composite of fluorescent carbon dots and graphene, and a preparation method for the two. The invention also relates to the fluorescent carbon dot Materials and application of carbon dot graphene composites as electrocatalysts in the field of fuel cells. Background technique [0002] Carbon dots (CDs) are a new type of carbon-based materials with a size smaller than 10nm, which have attracted extensive attention due to their excellent optical properties. Carbon dots were first discovered in 2004 as an accidental by-product of purifying single-walled carbon nanotubes. The study found that the fluorescence characteristics of carbon dots are very unique, and the peak position of the emission spectrum changes with the change of the excitation wavelength. Not only that, carbon dots also have the advantages of g...

Claims

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Application Information

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IPC IPC(8): B01J27/24C09K11/65C25B1/00H01M4/90
CPCY02E60/50
Inventor 邱介山胡超于畅王秀娜李明宇
Owner DALIAN UNIV OF TECH
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