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A kind of macro preparation method of porous graphene oxide

A technology of graphene and stone oxide, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the unfavorable mass production of porous graphene oxide, and achieve low cost, few implementation steps, and uniform composition Effect

Active Publication Date: 2020-12-08
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

This invention can peel off the method of preparing porous graphene oxide. Using alternating electric field to peel graphite oxide, compared with the traditional ultrasonic peeling method, it has the advantages of no noise and high yield, but the preparation of porous graphene oxide needs to be equipped with a special reaction equipment, not conducive to mass production of porous graphene oxide

Method used

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  • A kind of macro preparation method of porous graphene oxide
  • A kind of macro preparation method of porous graphene oxide
  • A kind of macro preparation method of porous graphene oxide

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preparation example Construction

[0054] The macro preparation method of porous graphene oxide of the present invention comprises the following steps:

[0055] 1) Using graphite as a raw material, graphene oxide is prepared by the Hummers improved method, and the graphene oxide prepared is prepared into a graphene oxide aqueous solution;

[0056] 2) ultrasonically dispersing the graphene oxide aqueous solution prepared in step 1), to obtain a uniformly dispersed graphene oxide aqueous solution;

[0057] 3) Slowly pour the cryogenic liquid into the uniformly dispersed graphene oxide aqueous solution prepared in step 2) to obtain graphene oxide ice cubes;

[0058] 4) Freeze-drying the graphene oxide ice cubes obtained in step 3) to obtain the porous graphene oxide.

Embodiment 1

[0060] The preparation of graphene oxide starts with H 2 SO 4 and H 3 PO 4 Mix the acid solutions in a 9:1 volume ratio configuration. Take 1g of flake graphite and 100mL of mixed acid solution and mix them in a single-necked flask, and stir them with magnetic force at room temperature to make them evenly mixed. Place the single-necked flask with the mixed solution under an ice-water bath, and slowly add an appropriate amount of potassium permanganate therein, and react with magnetic stirring for 1 h. After the reaction was completed, the one-necked flask was placed in a medium-temperature constant-temperature water bath and stirred for a certain period of time. After cooling to room temperature, it was poured into 100 mL of ice water, stirred evenly, and then hydrogen peroxide was added drop by drop until the solution turned bright yellow. After the reaction, the reaction product was centrifuged and washed with dilute hydrochloric acid, ethanol, and water, respectively, ...

Embodiment 2

[0064] Take 0.002 g of graphene oxide, prepare 2 mL of graphene oxide aqueous solution with a concentration of 1 mg / mL, and sonicate at a frequency of 20 kHz for 150 min to obtain a uniformly dispersed graphene oxide solution. Then, the normal temperature gaseous liquid nitrogen is slowly poured into the graphene oxide solution at a rate of 30mL / min until the solution is completely frozen into ice cubes, and then freeze-dried at -40°C for 24 hours to obtain the graphene oxide solution with micron Porous graphene oxide. The scanning electron microscope picture of the porous graphene oxide prepared by the present embodiment is as follows image 3 shown by image 3 It can be seen that the pore size of the porous graphene oxide prepared in this example is about 10 μm.

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Abstract

The invention provides a macro-preparation method of porous graphene oxide. The macro-preparation method of porous graphene oxide comprises the following steps that 1) with graphite as a raw material,graphite oxide is prepared by means of a Hummers improvement method, and obtained graphene oxide is prepared into an aqueous solution of graphene oxide; 2) the aqueous solution of graphene oxide is subjected to ultrasonic dispersion to obtain the uniformly-dispersed aqueous solution of graphene oxide; 3) low-temperature liquid is slowly poured into the uniformly-dispersed aqueous solution of graphene oxide to obtain ice cubes of graphene oxide; 4) the ice cubes of graphene oxide are freeze-dried to obtain porous graphene oxide. The macro-preparation method of porous graphene oxide is simple in operation process and low in cost, additional additives such as an etchant do not need to be added, obtained porous graphene oxide has uniform components, the pore diameter can be controlled in a range of 1-20 microns, the pore diameter distribution range is large, and the method is suitable for macro industrial production of porous graphene oxide.

Description

technical field [0001] The invention belongs to the technical field of preparation of porous graphene oxide, and relates to a macro preparation method of porous graphene oxide. Background technique [0002] Graphene is a crystal with a two-dimensional structure consisting of a single layer of carbon atoms through sp 2 Hybridization forms a two-dimensional hexagonal honeycomb lattice structure. Therefore, the single-layer graphene material has only a theoretical thickness of one carbon atom (0.335nm), which is the thinnest substance among known two-dimensional materials. It is precisely because of the unique crystal structure of graphene that determines its singular physical properties, such as high strength and hardness, large specific surface area, excellent thermal conductivity, strong electrical conductivity, high carrier mobility, and good optical properties. . It is precisely because graphene has many excellent characteristics that it can be widely used in flexible e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/198
CPCC01B32/198
Inventor 马岚魏璐瑶
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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