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A kind of method utilizing expander expanded graphite to prepare graphene oxide

A technology of expanded graphite and expansion agent, which is applied in the field of nanomaterial preparation, can solve problems such as environmental pollution, achieve excellent performance, simplify preparation steps, and reduce waste liquid pollution

Inactive Publication Date: 2017-06-09
NANJING XINYUE MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, this method is only suitable for a small amount of preparation in the laboratory for research, and a large amount of preparation is easy to produce a large amount of waste acid, waste water, etc., which will cause environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) The raw material that adopts in this technology is 3g 300 micron natural flake graphite, graphite is added in the concentrated sulfuric acid of 150ml earlier, after stirring and dispersing, slowly add 30ml nitric acid, then ice-bath stirring 24 hours.

[0026] (2) Pour the obtained mixture into 1000 ml of deionized water for dilution, cool to room temperature, filter and wash with water, and dry at 60°C for 24 hours. The last 1000W microwave expands until all the graphite becomes flocculent.

[0027] (3) After adding 3.6g K 2 SO 8 and 5.4g P 2 o 5 It needs to be carried out slowly, and then stirred at 60 degrees for 5h. Pour into 2L of water to dilute, cool to room temperature, filter and wash with water. Dry at room temperature for 48h.

[0028] (4) The obtained pre-oxidized graphite is added to 300ml Sc 2 W solution, fully stirred at room temperature for 24h, then mixed the well-stirred pre-oxidized graphite with Sc 2 Putting the W mixture into ice water r...

Embodiment 2

[0030] The first three steps are consistent with Example 1, and finally the pre-oxidized graphite is added to the ammonium bicarbonate solution, fully stirred for 24h at room temperature, and then the mixture of the fully stirred pre-oxidized graphite and ammonium bicarbonate is heated to obtain pre-oxidized graphene dispersion liquid.

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PUM

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Abstract

The invention discloses a method for preparing graphene oxide by using expanded graphite as an expansion agent. The expandable flake graphite is added to a concentrated sulfuric acid (98%) solution, fuming nitric acid is slowly added, and then dried. After microwave expansion, expanded graphite is obtained; take the above-mentioned expanded graphite, add it to concentrated sulfuric acid, stir and disperse evenly, and slowly add K2S2O8 and P2O5 to obtain pre-oxidized graphite; take pre-oxidized graphite and add it to the expansion agent, according to the expansion coefficient of the expansion agent Depending on the appropriate reaction temperature, pour off the supernatant, centrifuge, wash with water, and wash with 1mHCl three times until the pH is about 6 to obtain a graphene oxide dispersion. The method for preparing graphene oxide from expanded graphite can effectively reduce strong acid waste liquid, reduce pollution, protect the environment, is suitable for large-scale production, and is applied to various fields of industrial production.

Description

technical field [0001] The invention belongs to the field of preparation of nanometer materials, and in particular relates to a method for preparing graphene oxide by using an expansion agent to expand graphite. Background technique [0002] Graphene is a quasi-two-dimensional material with a thickness of only one atomic layer. It is the thinnest, strongest, and most conductive and thermally conductive nanomaterial discovered so far. It is widely used in mobile devices, aerospace, new energy batteries and other fields. It has a huge application prospect. The development and promotion of graphene materials is very likely to set off a disruptive new technology and new industry revolution sweeping the world. [0003] Graphene oxide is a new type of carbon material with excellent performance, which has a high specific surface area and abundant functional groups on the surface. Graphene oxide is the product of graphene oxidation. Graphene oxide still maintains the layered struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/23
Inventor 闵永刚崔岱麒曾文进蔡志远杨文斌
Owner NANJING XINYUE MATERIAL SCI & TECH
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