Low-cost hydrothermal-assisted method for preparing graphene oxide

A hydrothermal and fossil technology, applied in the field of graphene, can solve the problems of increasing the difficulty of preparation, reducing the yield, and limiting the degree of completeness of the reaction, and achieves the effects of high safety, improved yield and low cost

Active Publication Date: 2021-01-15
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method uses low temperature conditions to prepare graphene oxide, it does not use low temperature during the action of strong oxidants (concentrated sulfuric acid and fuming nitric acid) and graphite. Usually, the reaction process is violent, and a certain amount of heat will be released and the risk is high. , so it is easy to directly oxidize graphite into graphite oxide during the reaction, thereby reducing the yield; secondly, after cooling down and adding potassium permanganate, the reaction is only carried out at room temperature, and the completeness of the reaction is also limited to a certain extent, and the final graphite oxide The olefin material has a three-dimensional structure, and it still needs to be dispersed by ultrasound, which increases the difficulty of preparation

Method used

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  • Low-cost hydrothermal-assisted method for preparing graphene oxide
  • Low-cost hydrothermal-assisted method for preparing graphene oxide
  • Low-cost hydrothermal-assisted method for preparing graphene oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for hydrothermally assisting the preparation of graphene oxide, comprising steps as follows:

[0043] (1) First clean and thoroughly dry the 100mL polytetrafluoroethylene reactor lining, measuring cylinder and other utensils and the concentrated sulfuric acid (H 2 SO 4 ), potassium permanganate (KMnO 4 ), expanded graphite (EG) and other raw materials are fully dried and placed in a refrigerator at a temperature of 1°C, and cooled at a constant temperature for more than 12 hours for later use.

[0044] (2) Measure 50 mL of fully cooled concentrated sulfuric acid, transfer it to a 250 mL beaker, weigh 0.1 g of expanded graphite, add it to concentrated sulfuric acid, and stir thoroughly for 10 min. Weigh 3.0g of potassium permanganate and add it to the above solution, and fully stir for 20min. The obtained mixed solution was slowly transferred to a 100 mL polytetrafluoroethylene reaction kettle, sealed in a stainless steel jacket, and placed in a refrigerator ...

Embodiment 2

[0047] A method for hydrothermally assisting the preparation of graphene oxide, comprising steps as follows:

[0048] (1) First clean and thoroughly dry the 100mL polytetrafluoroethylene reactor lining, measuring cylinder and other utensils and the concentrated sulfuric acid (H 2 SO 4 ), potassium permanganate (KMnO 4 ), expanded graphite (EG) and other raw materials are fully dried and placed in a refrigerator at a temperature of 1°C, and cooled at a constant temperature for more than 12 hours for later use.

[0049] (2) Measure 60 mL of fully cooled concentrated sulfuric acid, transfer it to a 250 mL beaker, weigh 0.5 g of expanded graphite, add it to the concentrated sulfuric acid, and fully stir for 10 min. Weigh 6.0g of potassium permanganate and add it to the above solution, and fully stir for 20min. The obtained mixed solution was slowly transferred to a 100 mL polytetrafluoroethylene reaction kettle, sealed in a stainless steel jacket, and placed in a refrigerator a...

Embodiment 3

[0052] A method for hydrothermally assisting the preparation of graphene oxide, comprising steps as follows:

[0053] (1) First clean and thoroughly dry the 100mL polytetrafluoroethylene reactor lining, measuring cylinder and other utensils and the concentrated sulfuric acid (H 2 SO 4 ), potassium permanganate (KMnO 4 ), expanded graphite (EG) and other raw materials are fully dried and placed in a refrigerator at a temperature of 1°C, and cooled at a constant temperature for more than 12 hours for later use.

[0054] (2) Measure 50 mL of fully cooled concentrated sulfuric acid, transfer it to a 250 mL beaker, weigh 0.9 g of expanded graphite, add it to the concentrated sulfuric acid, and fully stir for 10 min. (3) Weigh 9.0g of potassium permanganate and add it into the above solution, and fully stir for 20min. The obtained mixed solution was slowly transferred to a 100 mL polytetrafluoroethylene reaction kettle, sealed in a stainless steel jacket, and placed in a refriger...

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Abstract

The invention discloses a low-cost hydrothermal-assisted method for preparing graphene oxide. According to the method for preparing the graphene oxide, the graphene oxide is oxidized and stripped through cooling and hydrothermal assistance. The graphene oxide obtained by the method has an independent lamellar structure. Compared with other chemical methods, independent two-dimensional layered graphene oxide can be obtained, compared with other physical methods, the method can effectively improve the stripping efficiency of graphite, and meanwhile, the method has the advantages that the operation is simple and safe, and the prepared graphene oxide has high efficiency. It is proved that the low-cost hydrothermal assistance method is a widely-popularized method for preparing graphene oxide.

Description

technical field [0001] The invention relates to a preparation method of a graphene oxide material, specifically belonging to the technical field of graphene. Background technique [0002] Graphene is a two-dimensional flat film material with a thickness of only one atom formed by the hybridization of carbon atoms. It has excellent physical and mechanical strength, good electrical conductivity, thermal conductivity and optical properties. Therefore, graphene has broad application prospects in physics, materials science, engineering and other fields. At present, the more common graphene preparation methods are mainly divided into chemical methods and physical methods, wherein physical methods mainly include methods such as ultrasonic stripping, mechanical stripping, etc. These methods for preparing graphene have the advantages of environmental friendliness and low cost, but physical methods It is usually difficult to obtain a thin layer of graphene oxide, the yield is low, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/198B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B2204/32C01B32/198
Inventor 王泰林郑秋菊沈建兴程传兵李魏
Owner QILU UNIV OF TECH
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