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Preparation method of coal-based graphene in molten salt system

A graphene and system technology, applied in the field of coal-based graphene preparation, can solve the problems of particle pollution, environmental hazards, etc., and achieve the effects of high purity, controllable layer number, and simple equipment

Pending Publication Date: 2022-03-15
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, when coal is incompletely burned, it will produce a lot of particulate pollutants, which will bring great harm to the environment

Method used

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  • Preparation method of coal-based graphene in molten salt system
  • Preparation method of coal-based graphene in molten salt system
  • Preparation method of coal-based graphene in molten salt system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this embodiment, ball-milled anthracite is used as the processing object.

[0031] Weigh 2 g of anthracite, add 5 g of potassium chloride at the same time, and mix the two evenly. Using ethanol as a solvent, wet ball milling was adopted, and the ball milling speed and time were set at 600 rpm and 6 h, respectively. The obtained product was washed with deionized water and ethanol three times respectively, and then dried at 80° C. for 12 h for use. Scanning electron microscope images of samples before and after ball milling are shown in figure 1 , it can be seen that the coal particle size after ball milling is uniform, and the particle size is greatly reduced, reaching about 1 micron.

Embodiment 2

[0033] In this embodiment, amorphous graphene prepared in molten salt is used as the processing object.

[0034] (1) Use a ball mill (or mortar) to grind 200 mg of ball-milled anthracite (with a particle size of 1 to 10 μm) and 2 g of K 2 CO 3 Grind well until well blended.

[0035] (2) Transfer the mixture of the two to a corundum porcelain boat and put it into a tube furnace for heat treatment. Argon was introduced into the tube furnace, the temperature was raised to 900°C at a rate of 5°C / min, and kept for 5h. After the reaction is finished, cool to room temperature, collect samples, and use 1mol L -1 Sulfuric acid was treated at 80°C for 8h, then washed with water for 5 times and then dried (80°C, 12h) to obtain the amorphous graphene product.

[0036] The scanning electron microscope and transmission electron microscope photos of amorphous graphene prepared under this condition are as follows: figure 2 As shown, it can be seen that the molten salt system can success...

Embodiment 3

[0038] In this embodiment, graphene prepared in molten salt is used as the processing object.

[0039] (1) Use a ball mill (or mortar) to grind 200 mg of ball-milled anthracite (particle size 10-100 μm), 2 g of KCl / CaCl 2 and 400mg FeCl 3 Grind well until well blended.

[0040] (2) The above mixture was transferred to a corundum porcelain boat, and heat-treated in a tube furnace. Argon gas was introduced into the tube furnace, the temperature was raised to 800°C at a rate of 10°C / min, and kept for 5h. After the reaction is finished, cool to room temperature, collect the sample, first remove the salt by washing with water, and then in 1mol L -1 Sulfuric acid was treated at 80°C for 8 hours, washed with water for 5 times and then dried to obtain a high-purity product.

[0041] Scanning electron microscopy and transmission electron microscopy of graphene prepared under this condition are as follows: image 3 As shown, it can be seen that the surface of the graphene sheet is ...

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Abstract

The invention belongs to the field of nano materials, and particularly relates to a preparation method of coal-based graphene in a molten salt system. In order to obtain graphene with a high added value and the preparation method is green, environment-friendly and low in cost, coal with a disordered structure is converted into graphene with a regular and ordered structure by utilizing the affinity of a molten salt system and a carbon material, intercalation exfoliation of metal ions and the catalytic action of a transition metal-based catalyst, and the graphene with a high added value is obtained. The method is green, environment-friendly, simple and easy to implement and suitable for large-scale industrial application, and the prepared graphene is few in structural defect and high in purity.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and in particular relates to a method for preparing coal-based graphene in a molten salt system. Background technique [0002] As a new type of two-dimensional layered material at the beginning of this century, graphene has important applications in many fields such as electrochemical energy storage and conversion, electronic devices, electromagnetic shielding, biomedicine and functional materials due to its unique physical and chemical characteristics. The preparation and structure regulation of graphene has always been a research hotspot. At present, the main preparation methods of graphene include mechanical exfoliation, solution oxidation and chemical vapor deposition. Among them, the solution oxidation method involves the use of strong acids and strong oxidants, which not only bring about environmental problems but also introduce a large number of structural defects in the lattice. In ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19
CPCC01B32/19C01B2204/32C01B2204/30
Inventor 朱胜韩高义
Owner SHANXI UNIV
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