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Expanded graphite as well as preparation method and application thereof

A technology of expanded graphite and graphite, applied in the field of expanded graphite and its preparation, to achieve the effects of simple and safe implementation process, controllable acid consumption and low energy consumption

Pending Publication Date: 2021-12-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the methods reported so far require heating or take several hours to prepare expanded graphite.

Method used

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  • Expanded graphite as well as preparation method and application thereof
  • Expanded graphite as well as preparation method and application thereof
  • Expanded graphite as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation method of this example expanded graphite, this method comprises the steps:

[0038] (1) At a temperature of 31°C, add 2g of phosphorus pentoxide, 5g of potassium persulfate, and 1g of 32-mesh graphite into a beaker in sequence, quickly pour 10ml of sulfuric acid, stir and dissolve with a glass rod, and react for 1min;

[0039] (2) Add 1ml of hydrogen peroxide, stir quickly, and let stand at room temperature for 1min;

[0040] (3) Add 100ml of water at one time, wash with water until neutral, freeze-dry to obtain expanded graphite.

Embodiment 2

[0042] The preparation method of this example expanded graphite, this method comprises the steps:

[0043] (1) At a temperature of 31°C, add 4g of phosphorus pentoxide, 15g of potassium persulfate, and 1g of 10,000-mesh graphite into a beaker in sequence, quickly pour 50ml of sulfuric acid, stir and dissolve with a glass rod, and react for 10 minutes;

[0044] (2) Add 1ml of hydrogen peroxide, stir rapidly, and let stand at room temperature for 10 minutes;

[0045] (3) Add 200ml of water at one time, wash with water until neutral, freeze-dry to obtain expanded graphite.

Embodiment 3

[0047] The preparation method of this example expanded graphite, this method comprises the steps:

[0048] (1) At a temperature of 31°C, add 20g of phosphorus pentoxide, 15g of potassium persulfate, and 1g of 10,000-mesh graphite into a beaker in sequence, quickly pour 50ml of sulfuric acid, stir and dissolve with a glass rod, and react for 10 minutes;

[0049] (2) Add 1ml of hydrogen peroxide, stir rapidly, and let stand at room temperature for 10 minutes;

[0050] (3) Add 250 ml of ice water at one time, wash with water until neutral, and obtain expanded graphite after freeze-drying.

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Abstract

The invention discloses expanded graphite and a preparation method and application thereof, wherein the preparation method comprises the following steps: S1, mixing phosphorus pentoxide, an expanding agent, graphite and sulfuric acid for reaction to prepare a mixture; and S2, mixing the mixture with an expanding aid for reaction to prepare the expanded graphite. The method provided by the invention can be used for rapidly synthesizing the chemically expanded graphite, and is controllable in acid consumption, low in energy consumption, simple and safe in implementation process and suitable for mass production. According to the method, heating energy consumption is not needed, rapid reaction can be achieved under the room temperature condition, the whole preparation time of the expanded graphite can be controlled within 10 minutes, the implementation process is simple and safe, and the method is suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of graphite, in particular to an expanded graphite and its preparation method and application. Background technique [0002] Expanded graphite can be made into graphite paper by calendering, and it can be used as an important precursor for the preparation of graphene, which has attracted extensive attention and research. Compared with pure graphite, expanded graphite has a larger apparent volume and weaker interlayer bonding. At present, the methods of synthesizing expanded graphite mainly include high temperature expansion method and chemical expansion method. Among them, the chemical expansion method is mainly prepared by the intercalation reaction between chemical reagents and graphite compounds. The main expansion reagent is persulfate expansion agent, and there are many studies on sulfuric acid intercalation graphite compounds. However, the currently reported methods all require heating or take severa...

Claims

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Application Information

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IPC IPC(8): C01B32/225
CPCC01B32/225
Inventor 孔纲朱炎彬刘恋车淳山
Owner SOUTH CHINA UNIV OF TECH
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