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Preparation method of magnetic graphene

A magnetic graphene and graphene technology, applied in graphene, permanent magnet manufacturing, inductor/transformer/magnet manufacturing, etc., can solve the problem of magnetic graphene composite materials losing magnetism, high chemical activity, difficult to obtain magnetic graphene materials, etc. problems, to achieve the effects of simplifying the preparation process, improving separation and recovery efficiency, and saving resources

Active Publication Date: 2019-08-16
龙烯新材料(常州)有限责任公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bare nano-Fe in existing magnetic graphene products 3 o 4 The particles have high chemical activity, are easily oxidized in the air, and are easily dissolved in a weakly acidic solution, so that the magnetic graphene composite material loses its magnetism, and it is difficult to obtain a stable magnetic graphene material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 12 g (1.0 mol) of flaky graphite powder was immersed in 300 g (3 mol) of sulfuric acid with a mass concentration of 98%, and left overnight at room temperature. Add 40g (0.2mol) of solid potassium ferrate powder to the sulfuric acid mixed solution containing graphite powder under stirring, carry out oxidation reaction at a temperature of 10-40°C for 8 hours, and oxidize the graphite powder into graphene oxide and dissolve it in the sulfuric acid solution , and then add the mixture to 1000 g of deionized water. Add 28g (0.1mol) of crystalline ferrous sulfate to the oxidation reaction mixture, then add ammonia water to the reaction solution to neutralize the solution to pH 6-8, and keep it warm at 60°C for 2 hours to form magnetic nano-Fe 3 o 4 / GO composite material, the magnetic graphene oxide was adsorbed and separated by a permanent magnet, washed with deionized water and dried in the air. magnetic nano-Fe 3 o 4 / The graphene oxide composite material is placed in ...

Embodiment 2

[0028] 12 g (1.0 mol) of flaky graphite powder was immersed in 500 g (5 mol) of sulfuric acid with a mass concentration of 98%, and left overnight at room temperature. Add 60g (0.3mol) of solid potassium ferrate powder to the mixed solution of sulfuric acid containing graphite powder under stirring, and carry out oxidation reaction at a temperature of 10-40°C for 12 hours to oxidize the graphite powder into graphene oxide and dissolve it in the sulfuric acid solution , and then add the mixture to 1000 g of deionized water. Add 27g (0.1mol) of crystalline nickel sulfate to the reaction mixture, then add ammonia water to the reaction solution to neutralize the solution to pH 6-8, and keep it at 60°C for 2 hours to form magnetic nano-NiFe 2 o 4 / GO composite material, the magnetic graphene oxide was adsorbed and separated by a permanent magnet, washed with deionized water and dried in the air. magnetic nano-NiFe 2 o 4 / GO composites were placed in a high-temperature furnace a...

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PUM

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Abstract

The invention relates to a magnetic graphene preparation method. The preparation method comprises four steps: expanding and oxidizing graphite powder; preparing and separating magnetic graphene oxide;thermally processing magnetic graphene oxide; and refining magnetic graphene and recovering. The specific surface area of obtained magnetic graphene powder is 600 to 800 m2 / g; the iron content is 0.5to 1.5%; and the number of the molecule layers of magnetic graphene is 3 to 9. Through a high temperature heat treatment, a magnetic material is wrapped in the graphene molecular layers, thus the magnetic material will not be dissolved in weakly acidic water, and the defect that the properties of magnetic graphene are not stable is overcome. The byproduct namely ferric sulfate generated in graphite oxidation by potassium ferrate is taken as the raw material of the magnetic material, the preparation technology is simplified, resources are saved, and the production cost is reduced.

Description

technical field [0001] The invention relates to a method for preparing magnetic graphene, in particular to a method for preparing magnetic graphene with nano ferrite as a magnetic material, belonging to the fields of chemical industry and new materials. [0002] technical background [0003] Graphene (GP), as an emerging carbon material, has a series of excellent properties such as light transmission, electrical conductivity, thermal conductivity, high strength, high toughness and high specific surface area due to its special structure. It is used in energy conversion and storage, optoelectronic devices , electrochemical sensors, environmental protection and medical and health fields have been widely used. Graphene generally refers to a two-dimensional carbon material with 1-9 carbon atomic layers, usually a nano-sized powder material, which has the disadvantages of being easy to condense and difficult to separate from aqueous solutions in applications. If graphene is endowe...

Claims

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Application Information

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IPC IPC(8): C01B32/19H01F41/02
CPCC01B32/19H01F41/0253H01F41/026
Inventor 于韶梅邢译李建生刘建东祖晓冬王欣刘炳光
Owner 龙烯新材料(常州)有限责任公司
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