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Method for separating and purifying graphene from pyrolysis carbon

A high-temperature pyrolysis, separation and purification technology, applied in the field of graphene, can solve the problems of high technical requirements and difficulty in obtaining pure graphene, and achieve the effects of simple operation, wide application range and low toxicity

Inactive Publication Date: 2018-08-24
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has too high technical requirements, and it is difficult to obtain graphene with higher purity in the end.

Method used

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  • Method for separating and purifying graphene from pyrolysis carbon
  • Method for separating and purifying graphene from pyrolysis carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Get the phenolic resin carbonization product 1g that contains graphene and pulverize into the powder that is less than 0.1mm with pulverizer, get the DMF solvent dissolving of 100mL again and disperse half an hour with high-speed disperser to obtain mixed solution, described mixed solution centrifugation 30min, control The rotating speed of centrifuge is 5000r / min, collects graphene suspension after removing precipitation; After described graphene suspension is dispersed at high speed for half an hour, carry out centrifugation 20min again, the rotating speed of control centrifuge is 5000r / min, filter and filter After the supernatant is dried, graphene with a layer number of 1 to 10 layers can be prepared, and the recovery rate can reach 48.7%.

Embodiment 2

[0051] Take 1g of phenolic resin carbonization product containing graphene and grind it into a powder smaller than 0.1mm with a pulverizer, then take 100mL of DMF solvent and 0.1g potassium sodium tartrate to dissolve the above powder, and disperse it with a high-speed disperser for half an hour to get mixed Solution, centrifuge the mixed solution for 30min, control the rotating speed of the centrifuge to 5000r / min, and collect the graphene suspension after removing the precipitate; disperse the graphene suspension at a high speed for half an hour and then perform centrifugation for 15min, control the centrifugation The rotating speed of the machine is 5000r / min, and the graphene with a layer number of 1 to 10 layers is prepared by filtering and drying the supernatant, and the recovery rate can reach 66.3%.

Embodiment 3

[0053] Get the carbonized product 1g of the phenolic resin that contains graphene and coal tar pitch (the mass ratio between the two is 1:1) and use pulverizer to be pulverized into the powder that is less than 0.1mm, then take the NMP solvent of 100mL to dissolve the above-mentioned powder, after dissolving Disperse with a high-speed disperser for half an hour to obtain a mixed solution, centrifuge the mixed solution for 20 minutes, control the rotating speed of the centrifuge to 5000r / min, and collect the graphene suspension after removing the precipitate; disperse the graphene suspension at a high speed for half an hour Then centrifuge for 15 minutes, control the rotating speed of the centrifuge to 5000r / min, filter and dry the supernatant to prepare graphene with 1-10 layers, and the recovery rate can reach 63.9%.

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Abstract

The invention discloses a method for separating and purifying graphene from pyrolysis carbon, and belongs to the technical field of graphene. The method comprises the steps of pulverizing a high-temperature carbonized product containing at least one of a resin and bitumen or biomass into powder by a pulverizer, adding a solvent, and dispersing a mixed solution by a high-speed disperser; separatingthe dispersed solution through centrifugation, removing precipitate, and collecting a graphite suspension; dispersing the graphite suspension in the high-speed disperser, and then separating throughthe centrifugation; taking and then filtering the suspension, recycling a filtrate, and drying filtered substances to obtain a graphene product; the recovery rate of the method can reach 30.0%-80.0%.Compared with other separating and purifying methods, the method has the advantages of simple process, wide application range, low cost, green and environmental protection, easy control of operating conditions, high purity of products and the like.

Description

technical field [0001] The invention relates to the purification of graphene, and belongs to the technical field of graphene, in particular to a method based on separating and purifying graphene from high-temperature pyrolysis carbon. Background technique [0002] Graphene is a two-dimensional carbon atom crystal tightly packed by a single layer of carbon atoms, with a thickness of about 0.335nm, in which the carbon-carbon bond passes through the SP 2 Formed by hybridization, the bond length is about 0.142nm. In the graphene plane, each carbon atom is connected with three adjacent carbon atoms by σ bonds, so that the entire sheet has high structural strength. At the same time, each carbon atom has an unbonded π electron, so π orbitals can be formed in the vertical direction. Due to the existence of π orbitals, electrons can move freely in graphene crystals, so that graphene has excellent electron transport properties, and the electron mobility on the plane at room temperatu...

Claims

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Application Information

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IPC IPC(8): C01B32/196
CPCC01B2204/04C01B32/196
Inventor 伍林张军锋胡雅刘盈舒沙沙许锦辉柳家明宋权桂黄珍欣
Owner WUHAN UNIV OF SCI & TECH
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