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Method for preparing graphene on large scale and application

A large-scale preparation and graphene technology, applied in the field of graphene, can solve the problems of waste, hindering the widespread application and commercialization of graphene, and achieve the effect of no pollution, simple and safe process, and low equipment requirements

Pending Publication Date: 2021-04-09
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although CVD has been developed to prepare single-layer graphene, this method requires the use of metallic materials as catalytic substrates and a high-temperature gas-phase process, which further hinders the widespread application and commercialization of graphene.
[0003] On the other hand, the world currently produces about 20 billion tons of paper every year. These papers are usually buried or burned on the spot after use, causing great waste and putting great pressure on the ecological environment.

Method used

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  • Method for preparing graphene on large scale and application
  • Method for preparing graphene on large scale and application
  • Method for preparing graphene on large scale and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This embodiment provides a method for preparing graphene from waste paper. In this method, the commercially available A4 paper is first cut into a size of 30mm×20mm, and about 0.8g of paper is weighed, placed in a ceramic ark, and then calcined in a muffle furnace, and the temperature is raised from room temperature to 900°C in 120 minutes. , before the temperature rises to 200°C, high-purity nitrogen is maintained through the quartz tube. Maintain at 900 °C for 10 min, then turn off the power of the tube furnace and cool to room temperature. After the sample was taken out, it was ultrasonically treated in 50mL of 2mol / L HCl solution for 4h. Then, the suspension obtained by sonication was washed with deionized water and 95% ethanol by suction filtration several times. The obtained product was dried in an oven at 100° C. for more than 2 hours to obtain graphene.

[0043] see figure 1 and figure 2 , figure 1 The Raman spectrum of the graphene prepared for Example 1...

Embodiment 2

[0047] This embodiment provides a method for preparing graphene from waste paper. In this method, the commercially available A4 paper is first cut into a size of 30mm×20mm, and about 0.8g of paper is weighed, placed in a ceramic ark, and then calcined in a muffle furnace, and the temperature is raised from room temperature to 800°C in 105 minutes. , before the temperature rises to 200°C, high-purity nitrogen is maintained through the quartz tube. Maintain at 800 °C for 10 min, then turn off the power of the tube furnace and cool to room temperature. After the sample was taken out, it was ultrasonically treated in 50mL of 2mol / L HCl solution for 4h. Then, the suspension obtained by sonication was washed with deionized water and 95% ethanol by suction filtration several times. The obtained product was dried in an oven at 100° C. for more than 2 hours to obtain graphene. see image 3 , image 3 It is the transmission electron microscope image of the graphene prepared in Exam...

Embodiment 3

[0050] This embodiment provides a method for preparing graphene from waste paper. In this method, the commercially available A4 paper is first cut into a size of 30mm×20mm, and about 0.8g of paper is weighed, placed in a ceramic ark, and then calcined in a muffle furnace, and the temperature is raised from room temperature to 700°C for 90 minutes. , before the temperature rises to 200°C, high-purity nitrogen is maintained through the quartz tube. Maintain at 700 °C for 10 min, then turn off the power of the tube furnace and cool to room temperature. After the sample was taken out, it was ultrasonically treated in 50mL of 2mol / L HCl solution for 4h. Then, the suspension obtained by sonication was washed with deionized water and 95% ethanol by suction filtration several times. The obtained product was dried in an oven at 100° C. for more than 2 hours to obtain graphene. see Figure 4 , Figure 4 It is a transmission electron microscope image of the graphene prepared in Exam...

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Abstract

The invention provides a method for preparing graphene on a large scale, and the method comprises the following steps: pulverizing waste paper, and performing carbonizing under a protective atmosphere condition to obtain a carbonized product; and carrying out ultrasonic treatment on the carbonized product in a hydrochloric acid solution, and performing washing and drying to obtain graphene. The method provided by the invention has the advantages of low requirements on equipment, simple and safe process, no need of additional catalysts, greatly reduced production cost and basically no pollution to the environment, and the raw material is used waste paper which is cheap and easily available, so that the method is suitable for large-scale industrial application and production; and the prepared graphene has good electrical properties when being used in supercapacitors.

Description

technical field [0001] The invention belongs to the technical field of graphene, and in particular relates to a large-scale preparation method and application of graphene. Background technique [0002] Graphene is a new type of two-dimensional material, due to its excellent theoretical specific surface area and electrical properties, graphene shows great application potential in the field of electrochemistry, such as supercapacitors, batteries, fuel cells and electrocatalyst materials. However, large-scale production of high-quality graphene has been challenging, limiting its further applications. Therefore, the research on its amplification synthesis is always an important research topic. So far, graphene synthesis methods are mainly divided into top-down strategies and bottom-up strategies. Top-down strategies aim to break up and separate graphite flakes by physical or chemical methods, including micromechanical exfoliation, liquid exfoliation, redox methods, etc. Altho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19H01G11/36H01G11/86
CPCC01B32/19H01G11/36H01G11/86C01B2204/22Y02E60/13
Inventor 刘波汪敏
Owner UNIV OF SCI & TECH OF CHINA
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