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Method for performing graphene material size separation by utilizing multilayer dialysis

A graphene and size technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problem of grading the size of graphene materials, and achieve the effect of controllable separation and performance

Active Publication Date: 2018-12-14
HUAQIAO UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is currently no method to classify graphene materials by size using dialysis

Method used

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  • Method for performing graphene material size separation by utilizing multilayer dialysis
  • Method for performing graphene material size separation by utilizing multilayer dialysis
  • Method for performing graphene material size separation by utilizing multilayer dialysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1) Preparation of GO

[0041] Put 325 mesh graphite powder (2.0g) and concentrated sulfuric acid (70mL) into a 250mL flask, stir mechanically (200r.p.m) in an ice bath, and then slowly add KMnO 4 (7.0g) to keep the temperature of the suspension lower than 5°C for 30min; then, transfer the reaction system to a 35°C water bath and vigorously stir (300r.pm) for about 2h; then add 200mL of water, and then the solution Stir for 15h; then add 5mL H dropwise 2 O 2 (30%), the solution changed from dark brown to yellow; the mixture was filtered and washed with 5% HCl aqueous solution (50 mL three times) to remove metal ions, and washed with water to neutral; the obtained solid was dispersed in water to form 2 mg·mL -1 suspension.

[0042] 2) Multilayer "dialysis" separation of GO

[0043] Clean the screen, layered and semi-fixed (semi-fixed means that the edges of the screen are fixed on the container and the screen is in a relaxed state) in a 50L bucket, and the upper layer is a scree...

Embodiment 2

[0058] 1) Preparation of GO

[0059] Put 800 mesh graphite powder (2.0g) and concentrated sulfuric acid (70mL) into a 250mL flask, stir mechanically (200r.p.m) in an ice bath, and then slowly add KMnO 4 (7.0g) to keep the temperature of the suspension below 5°C for 30 minutes. Then, the reaction system was transferred to a 35° C. water bath and vigorously stirred (300 r.p.m) for about 2 hours. Then 200 mL of water was added, and the solution was stirred for 15 h. Then add 5mL H dropwise 2 O 2 (30%), the solution changed from dark brown to yellow. The mixture was filtered and washed with 5% HCl aqueous solution (50 mL three times) to remove metal ions, and washed with water until neutral. The obtained solid is dispersed in water to form 2mg·mL -1 suspension.

[0060] 2) Multilayer "dialysis" separation of GO

[0061] Clean the sieve, layer and semi-fix it in a 20L bucket, the upper layer is 2000 mesh sieve, the lower layer is 8000 mesh, the distance between the layers is not fixed...

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Abstract

The invention discloses a method for performing graphene material size separation by utilizing multilayer dialysis. The method comprises the following steps: 1) dispersing a graphene material into a solvent to obtain graphene material dispersion; 2) semi-fixing screens with different pore sizes in a container in a layered manner according to the size; 3) filling the solvent with the container andgaps among the various screen layers, adding the graphene material dispersion onto the screen with the maximum pore size positioned on the uppermost side, performing dialysis, performing free diffusion on the graphene material along with time, and realizing continuous size grading of the graphene material by utilizing a concentration difference dialysis principle, wherein the graphene material canbe divided into multiple grades in one step according to the size by utilizing the multiple layers of the screens of different pore sizes; obtaining the graphene material dispersion of different sizeranges after dialysis completion. The method disclosed by the invention has continuity, can realize multi-stage size separation in one step, is simple, effective, cheap and environmental-friendly, and can realize large-scale application.

Description

Technical field [0001] The invention belongs to the technical field of graphene materials, and specifically relates to a method for size separation of graphene materials by using multi-layer dialysis. Background technique [0002] Among the preparation methods of graphene, graphene oxide and its derivatives, the redox method and the direct liquid phase exfoliation method are simple and easy to operate. The graphene oxide, graphene and their derivatives obtained by these methods are widely used. However, in the process of strong chemical reaction and mechanical peeling, there is a certain amount of damage to the size of the film, which often results in uncontrollable product size. Both large-diameter and small-diameter graphene oxide and graphene have their own advantages and have different uses. For example, small pieces can be used for sensors, adsorption, etc., large pieces can be used as fibers, etc., and the electrical and thermal properties are also the same as those of gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/198
CPCC01B32/198
Inventor 陈国华崔春娜赵立平
Owner HUAQIAO UNIVERSITY
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