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Method for concentrating and purifying graphene and graphene based composite material dispersion liquid

A composite material, graphene-based technology, applied in the field of nanomaterials, can solve the problems of easy residual impurities, high cost, low efficiency, etc., and achieve the effects of reducing cost, easy operation and simple process

Inactive Publication Date: 2015-06-10
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, high-speed centrifugation or addition of acid and alkali are mainly used to concentrate the dispersion liquid to settle graphene and graphene-based composite materials, but these methods have some disadvantages, such as high cost, low efficiency, and easy residual impurities, etc., so it is necessary to develop A high-efficiency, low-cost purification and concentration method

Method used

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  • Method for concentrating and purifying graphene and graphene based composite material dispersion liquid
  • Method for concentrating and purifying graphene and graphene based composite material dispersion liquid
  • Method for concentrating and purifying graphene and graphene based composite material dispersion liquid

Examples

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Effect test

Embodiment 1

[0029] Embodiment 1, the purification and concentration of graphene oxide aqueous dispersion are example:

[0030] Step 1: Pour the graphene oxide aqueous dispersion into a plastic bucket, place it in a refrigerator freezer (about -25 degrees Celsius), and let it stand for about 12 hours to completely freeze the dispersion;

[0031] Step 2: Place the plastic bucket in warm water to thaw, and let it stand for about 12 hours to completely settle the flocculated graphene oxide;

[0032] Step 3: remove the supernatant to obtain the lower graphene oxide concentrate;

[0033] Step 4: In order to improve the purity of the graphene oxide dispersion, water can be added to dilute it, and then the above freeze-concentration steps can be repeated, and the chloride ion impurity content in the dispersion will decrease by 20%-95%.

Embodiment 2

[0034] Embodiment 2, the purification and the concentration of the graphene oxide dispersion liquid of reduction are example:

[0035] Step 1: A mixture of 10% by volume ethanol and water is used as a solvent, and the reduced graphene oxide dispersion is poured into a plastic bucket, placed in a cold storage (about -25 degrees Celsius), and left to stand for about 20 hours to make the dispersion completely frozen;

[0036] Step 2: Place the plastic bucket at room temperature to thaw completely, and let it stand for about 15 hours to completely settle the flocculated reduced graphene oxide;

[0037] Step 3: removing the supernatant to obtain the reduced graphene oxide concentrate of the lower layer;

[0038] Step 4: In order to improve the purity of the product, a mixed solution of 10% by volume ethanol and water can be added for dilution, and the above-mentioned freeze-concentration steps can be repeated.

Embodiment 3

[0039] Embodiment 3, the purification and concentration of graphene oxide and manganese oxide composite material dispersion liquid are example:

[0040] Step 1: Pour the aqueous dispersion of graphene oxide and manganese oxide composite material into a plastic bucket, place it in a refrigerator freezer (about -25 degrees Celsius), and let it stand for about 15 hours to completely freeze the dispersion;

[0041] Step 2: Place the plastic bucket in warm water to thaw completely, and let it stand for about 5 hours to completely settle the flocculated graphene oxide and manganese oxide composite material;

[0042] Step 3: remove the supernatant to obtain the concentrated solution of the lower layer;

[0043] Step 4: In order to improve the purity of the product, deionized water can be added for dilution, and the above freeze-concentration steps can be repeated.

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Abstract

The invention relates to a method for concentrating and purifying a graphene and graphene based composite material dispersion liquid. The method comprises the following steps: 1, cooling the graphene and graphene based composite material dispersion liquid into a frozen block; 2, unfreezing the frozen block, and performing standing or centrifugal treatment; 3, after the flocculate caused by freezing is settled, removing the supernatant liquid and obtaining the concentrate of the lower layer; 4, in order to further improve the product purity, adding a solvent for diluting and repeating the steps. The method is simple and convenient to operate; the preparation period is short and no complex and expensive equipment needs to be purchased. Compared with the existing dialytic purification, the method is capable of shortening the purification time, improving the production efficiency and reducing the production cost, and suitable for industrial production. Furthermore, the method is capable of realizing the concentration of the solution, so that the difficulty of subsequent drying can be greatly reduced and the energy consumption can be reduced; in short, the method has wide application value and industrial prospect.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, in particular to a method for concentrating and purifying graphene and graphene-based composite material dispersion liquid. Background technique [0002] Graphene is a nanomaterial with a single-layer sheet structure composed of carbon atoms, which is composed of carbon atoms in sp2 hybrid orbitals. Graphene has many excellent properties, such as high carrier mobility, large specific surface area, high thermal conductivity, high Young's modulus, extremely strong fracture strength) and so on. Due to the excellent and unique properties of graphene, it has bright prospects in applications such as printed and flexible circuits, ultrafast transistors, ultrafast lasers for touch screens, photodetectors, and thermally conductive films. At the same time, graphene can also be compounded with other materials to form materials with different properties, such as compounding with nano-silicon for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B82Y30/00
Inventor 沈志刚刘磊张晓静麻树林
Owner BEIHANG UNIV
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