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A method for continuous size classification of graphene materials using packed columns

A classification method, graphene technology, applied in graphene, chemical instruments and methods, nano-carbon, etc., can solve the problems of no way to achieve high-precision separation, complicated steps, complicated operation, etc., and achieve good size separation effect, fine Maximize size separation and achieve the effect of regulation

Active Publication Date: 2021-02-05
HUAQIAO UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have their own advantages, but there are also some inconveniences, such as the difficulty in preparing the separation medium, the high cost of separation, some operations are relatively complicated, and some can only obtain graphene with two particle sizes, and there is no way to achieve high-precision separate
Among them, the membrane filtration method (Adv Mater 2015; 27(24):3654–3660) can obtain multi-stage products on the basis of multiple filtrations, but multiple filtrations are required, and the steps are relatively complicated

Method used

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  • A method for continuous size classification of graphene materials using packed columns
  • A method for continuous size classification of graphene materials using packed columns
  • A method for continuous size classification of graphene materials using packed columns

Examples

Experimental program
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Effect test

Embodiment 1

[0035] 1) Preparation of graphene oxide (GO): 2000 mesh graphite powder was used to prepare by modified hummers method. Graphite powder (2.0 g) and concentrated sulfuric acid (70 mL) were placed in a 250 mL flask, mechanically stirred (200 rpm) under an ice bath, and then KMnO was added slowly 4 (7.0 g) to keep the temperature of the suspension below 5°C for 30 minutes. Immediately afterwards, the reaction system was transferred to a water bath at 35° C. and vigorously stirred (300 rpm) for about two hours. Then 200 mL of water was added and the solution was stirred for an additional 15 minutes. After that, 5 mL of H was added dropwise 2 o 2 (30%), the solution turned from dark brown to yellow. The mixture was filtered and washed with 5% aqueous HCl (3 times 50 mL) to remove metal ions, and washed with water until neutral. The resulting solid was dispersed in water to form 2mg mL -1 suspension.

[0036] 2) Grading graphene oxide with a silica gel column: Rinse the irreg...

Embodiment 2

[0050] 1) Preparation of graphene oxide (GO): 200 mesh graphite powder was used to prepare by modified hummers method. Graphite powder (2.0 g) and concentrated sulfuric acid (70 mL) were placed in a 250 mL flask, mechanically stirred (200 rpm) under an ice bath, and then KMnO was added slowly 4 (7.0 g) to keep the temperature of the suspension below 5°C for 30 minutes. Immediately afterwards, the reaction system was transferred to a water bath at 35° C. and vigorously stirred (300 rpm) for about two hours. Then 200 mL of water was added and the solution was stirred for an additional 15 minutes. After that, 5 mL of H was added dropwise 2 o 2 (30%), the solution turned from dark brown to yellow. The mixture was filtered and washed with 5% aqueous HCl (3 times 50 mL) to remove metal ions, and washed with water until neutral. The resulting solid was dispersed in water to form 2mg mL -1 suspension.

[0051] 2) Grading graphene oxide with a ceramic particle column: Rinse the ...

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Abstract

The invention discloses a continuous size classification method for graphene oxide by using a packing column, comprising the following steps: 1) dispersing the graphene material in a solvent to obtain a graphene material dispersion; 2) filling the filler with different particle sizes To the chromatographic column, holes of different sizes are formed between the fillers, and the holes in the fillers between the entire columns are through holes; 3) Use a solvent as the mobile phase to wash the column, and add the graphene material dispersion to the top filler of the chromatographic column Then, rinse with a solvent, collect the liquid in sections according to the outflow time of the graphene material, and then obtain graphene material dispersions in different size ranges. The method is based on the correlation between the size of the graphene material and the filler, and the size of the filler column, and realizes the continuous size classification of the graphene material, and can divide the graphene material into many grades by size in one step. The method is continuous, can realize the separation of multi-level sizes in one step, is simple, effective, cheap and environmentally friendly, and can be applied on a large scale.

Description

technical field [0001] The invention belongs to the technical field of graphene materials, and in particular relates to a continuous size classification method for graphene materials with a packing column. Background technique [0002] Graphene has attracted much attention because of its unique properties. There are many methods for preparing graphene, among which redox method is a simple and easy-to-operate method. The graphene oxide and its derivatives obtained by this method have good dispersion and wide application because they contain multiple oxidation functional groups, and their reduced products are also very popular. However, in the process of a strong chemical reaction, there is a certain damage to the size of the film, which often leads to uncontrollable product size. Graphene oxide and graphene, whether large or small, have their own advantages, mainly depending on their use. For example, small pieces can be used for sensors, adsorption, etc. Large pieces can b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/194C01B32/198
CPCC01B2204/32
Inventor 陈国华崔春娜赵立平
Owner HUAQIAO UNIVERSITY
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