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Method for preparing grapheme by means of aqueous phase cutting and stripping

A technology of graphene and graphite, which is applied in the field of graphene prepared by shear exfoliation in water phase, can solve the problems of low packing density of graphene powder, difficulty in application and transportation, limited dispersion ability, etc., and achieves convenience for further use and complete lattice structure , Ease of recycling

Inactive Publication Date: 2015-03-25
安徽百特新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such a preparation process not only requires high energy consumption and lengthy process; moreover, the packing density of the prepared graphene powder is extremely small (3 ), the dispersion ability of powder products in solvents is limited (for example, the stable dispersion concentration of graphene in organic solvents is less than 3 wt%, Accounts of Chemical Research, 2013, 46(1), 14-22.), making it Difficult to apply and transport

Method used

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  • Method for preparing grapheme by means of aqueous phase cutting and stripping
  • Method for preparing grapheme by means of aqueous phase cutting and stripping

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Mix 200 ml of concentrated sulfuric acid (98%) with 10 grams of potassium permanganate (purity>95%), 10 grams of flake graphite powder (particle diameter is 500 microns or 35 mesh, carbon content>95%), control the temperature of the system below 35 o C. After stirring continuously for 2 hours, slowly add it into 1000 ml of ice water, and remove the heat of reaction in time to avoid excessive temperature of the system. Then 20 milliliters of hydrogen peroxide was added and stirred for 5 minutes, and the graphite intercalation compound was obtained after filtration.

[0027] The graphite intercalation compound obtained after filtration (wet) was mixed with 10 g of sodium hydroxide and 250 ml of water. A black graphene suspension was obtained after treatment with a shear stirrer (power 500 W) at 18,000 rpm for 50 min. After the obtained black solution was centrifuged at 10,000 rpm for 10 minutes, the supernatant was poured off to obtain an aqueous phase paste with high s...

Embodiment 2

[0029] Evenly mix 100 ml of fuming sulfuric acid (containing 20% ​​sulfur trioxide), 5 ml of hydrogen peroxide and 10 grams of flake graphite powder (particle diameter is 500 microns), and control the system temperature below 35 o C. After continuous stirring for 2 hours, slowly add it into 1000 ml of ice water, pay attention to remove the heat of mixing in time to avoid excessive temperature of the system. Then 20 milliliters of hydrogen peroxide was added and stirred for 5 minutes, and the graphite intercalation compound was obtained after filtration.

[0030] The graphite intercalation compound obtained after filtration (wet) was mixed with 10 g of sodium hydroxide and 250 ml of water. A black graphene suspension was obtained after treatment with a shear stirrer (power 500 W) at 18,000 rpm for 50 min. After the obtained black solution was centrifuged at 10,000 rpm for 10 minutes, the supernatant was poured off to obtain an aqueous phase paste with high single-layer graphen...

Embodiment 3

[0032] Mix 30 grams of ammonium persulfate, 200 milliliters of concentrated sulfuric acid (98%) and 10 grams of flake graphite powder (500 microns in particle diameter), stir at room temperature for 6 hours, then slowly add it to 1000 milliliters of ice water, pay attention to remove the heat of mixing in time, Avoid excessive system temperature. Then 20 milliliters of hydrogen peroxide was added and stirred for 5 minutes, and the graphite intercalation compound was obtained after filtration.

[0033] The graphite intercalation compound obtained after filtration (wet) was mixed with 10 g of sodium hydroxide and 250 ml of water. A black graphene suspension was obtained after treatment with a shear stirrer (power 500 W) at 18,000 rpm for 50 min. After the obtained black solution was centrifuged at 10,000 rpm for 10 minutes, the supernatant was poured off to obtain an aqueous phase paste with high single-layer graphene content. Compared with graphite raw materials, the yield of...

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Abstract

The invention relates to a method for preparing grapheme by means of aqueous phase cutting and stripping. The method comprises the following steps: 1) performing intercalation treatment on graphite serving as a raw material to prepare a graphite intercalation compound; 2) adding a certain amount of active substances, and cutting a graphite interlamination compound under a certain condition; and 3) centrifuging or filtering mixed liquid subjected to cutting treatment to prepare a high-concentration grapheme sizing agent or a filter cake which can be dispersed again. According to the method, the cutting operation is carried out by using low-cost reagents at a room temperature; because of low energy consumption, no pollution and high efficiency, the prepared graphene nanolamellas can be widely applied to the fields of energy storage and conversion, catalysis, various types of composite materials, paintings, conductive ink and the like.

Description

technical field [0001] The invention belongs to the technical field of graphene preparation, and relates to a method for preparing graphene by shear exfoliation in aqueous phase, in particular to a method for exfoliating graphite in an aqueous solution to form graphene through shearing treatment, and finally realizing low energy consumption and high yield of graphene High-efficiency and large-scale preparation methods. Background technique [0002] As an ideal two-dimensional material, graphene has increasingly become a hot spot in current scientific research. Graphene is the basic structural unit of natural graphite, with a sheet thickness of only 0.335 nm. It has high mechanical modulus (1.0 TPa), thermal conductivity (5300 W / m.K), specific surface area (2630 m 2 / g) and charge mobility (250,000 cm 2 / V.s), has broad application prospects in polymer composite materials, energy materials, electronic communications and other fields. Therefore, the preparation of high-qual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 卢红斌董雷李梦雄林珊
Owner 安徽百特新材料科技有限公司
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