Method and device for purifying graphene oxide/graphite solution

A technology of graphene solution and purification method, which is applied in pharmaceutical formulations, cosmetic preparations, electrodialysis, etc., and can solve problems such as time-consuming, low filtration efficiency, and complicated processes

Active Publication Date: 2012-08-08
上海碳源汇谷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

Therefore, the obtained graphene oxide and graphene contain a large amount of impurity ions, which are usually separated and purified by filtration, centrifugation and dialysis, and the process is complicated.
Especially in the process of ...

Method used

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  • Method and device for purifying graphene oxide/graphite solution
  • Method and device for purifying graphene oxide/graphite solution

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Embodiment 1

[0020] Such as Figure 1-2 Shown, a kind of device of the purifying method of graphene oxide / graphene solution, this device comprises dialysis cavity (dialysis bag) 1 and negative and positive electrode (cathode 2 and anode 3), and described negative and positive electrode is respectively arranged on dialysis cavity 1 On both sides, a graphene oxide / graphene solution channel is provided in the middle of the dialysis chamber 1, and a solvent flow channel is provided between the dialysis chamber and the cathode and anode electrodes;

[0021] The dialysis bag 1 is placed in the channel of the cathode 2 and the anode 3 made of stainless steel wire mesh, the dialysis bag 1 has a molecular weight cut-off of 5000, and the 1 mg / mL graphite oxide to be purified in the graphene oxide / graphene solution storage tank 8 The graphene oxide aqueous solution 4 enters from one end of the dialysis bag 1 through the pump 9 and the flow meter 10, and is subjected to the electric field between the ...

Embodiment 2

[0023] Place the dialysis bag in the channel of the cathode and anode electrodes composed of stainless steel wire mesh. The molecular weight cut-off of the dialysis bag is 5000. The 1 mg / mL graphene oxide aqueous solution enters from one end of the dialysis chamber and finally flows out from the other end. The voltage between the cathode and anode electrodes is 1.5V. The water flow and the graphene oxide aqueous solution pass through the channel between the cathode and anode electrodes in countercurrent. The flow rate of the graphene oxide aqueous solution is 1 mL / min, and the water flow rate is 100 mL / min. The obtained final product graphene oxide aqueous solution is filtered, and the conductivity of the filtrate is measured to be 85sm -1 .

Embodiment 3

[0025] The dialysis chamber is a chamber composed of a diaphragm; the molecular weight cutoff of the dialysis chamber is 3000. The ethanol flow is cross-flow with the graphene oxide ethanol solution. The ratio of the flow rate of graphene oxide ethanol solution to the flow rate of ethanol flow is 1:100. The concentration of the graphene oxide ethanol solution is 0.1mg / mL, and the voltage between the cathode and anode electrodes is 0.1V, and the anode and cathode electrodes are composed of a conductive coating coated on a metal film. All the other are with embodiment 1.

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Abstract

The invention relates to a method and a device for purifying a graphene oxide/graphene solution. According to the method, the graphene oxide/graphene solution to be purified is introduced into a dialysis cavity, wherein the dialysis cavity is located between a cathode and an anode, a channel for the graphene oxide/graphene solution is located in the middle of the dialysis cavity, and solvent flowing channels are formed between the dialysis cavity and the cathode as well as between the dialysis cavity and the anode; the graphene oxide/graphene solution to be purified enters the dialysis cavity from one end of the dialysis cavity and is exposed to the action of an electric field between the cathode and the anode; ions and charge particles in the graphene oxide/graphene solution to be purified migrate to the electrodes with opposite charges by respectively transmitting through the wall of the dialysis cavity and then are taken way by solvent flows; and the residual purified graphene oxide/graphene solution flows out form the dialysis cavity. Compared with the prior art, the method and the device have the advantages of low cost, high efficiency, suitability for mass production and the like.

Description

technical field [0001] The invention relates to a method for purifying a graphene oxide / graphene solution, in particular to a device and method for fast and deep purification of a graphene oxide / graphene solution based on electrodialysis. Background technique [0002] Graphene has a two-dimensional lattice structure, and the carbon atoms in the plane are sp 2 The hybrid orbitals are connected to form a hexagonal lattice structure, that is, carbon atoms are connected to three adjacent carbon atoms through strong σ bonds, and the C-C bonds make graphene have good structural rigidity. The remaining one p-electron orbit is perpendicular to the graphene plane, forming π bonds with the surrounding atoms, and the delocalization of π electrons in the lattice makes graphene have good conductivity, and the electron mobility on the plane at room temperature is 1.5 ×10 4 cm 2 / V s, far exceeds the conduction rate of electrons in general conductors, so it has a broad potential applica...

Claims

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Application Information

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IPC IPC(8): B01D61/42C01B31/04A61K8/9789A61K8/9794
Inventor 吴海霞郭守武
Owner 上海碳源汇谷新材料科技有限公司
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