Preparation method of mesoporous reduced graphene oxide absorbent

A graphene and absorbent technology, which is applied in the field of preparation of mesoporous reduced graphene oxide absorbents, can solve the problems of increasing washing, freeze-drying cycles, large amount of graphene, and limited wave-absorbing performance, and achieves remarkable mesoporous characteristics. , the effect of large specific surface area and low preparation cost

Pending Publication Date: 2022-07-26
CHENGDU AIRCRAFT INDUSTRY GROUP
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Problems solved by technology

[0005] The above-mentioned patent adds sulfur and nitrogen-containing reducing agents to a low-concentration graphite oxide solution of 1~2 mg / mL to heat and react to obtain products. drying cycle, and the effect of yield increase is not significant
The microwave-absorbing performance of the final product obtained by this patent is obtained by compounding graphene with 30%~70% paraffin wax. The amount of graphene is huge, and the microwave-absorbing performance is also limited.

Method used

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  • Preparation method of mesoporous reduced graphene oxide absorbent
  • Preparation method of mesoporous reduced graphene oxide absorbent
  • Preparation method of mesoporous reduced graphene oxide absorbent

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preparation example Construction

[0037] The present embodiment discloses a preparation method of a mesoporous reduced graphene oxide absorbent, comprising the following steps:

[0038] Step 1: Prepare a certain concentration of reducing agent aqueous solution, the reducing agent aqueous solution can be ascorbic acid aqueous solution or hydroiodic acid aqueous solution, and the ascorbic acid aqueous solution concentration range is 2~12mg mL -1 , the concentration range of hydroiodic acid aqueous solution is 5.7wt%~57wt%;

[0039] Step 2: Weigh a certain quality of graphene oxide powder and add it to the reducing agent water solvent, and add 0.5g graphene oxide powder to every 50mL of the reducing agent aqueous solution;

[0040] Step 3: put the solution in step 2 into a blast drying oven for heating, the heating temperature is 65~105°C, and the heating time is 2~4h;

[0041] Step 4: After heating, the product is washed with deionized water to remove excess reducing agent, and the product is centrifugally wash...

Embodiment 1

[0044] The present embodiment provides a mesoporous reduced graphene oxide absorbent, and the preparation method thereof includes the following steps:

[0045] Step 1: Prepare 50mL with a concentration of 4mg mL -1 Aqueous solution of ascorbic acid reducing agent;

[0046] Step 2: add 0.5g graphene oxide powder to the ascorbic acid aqueous solution;

[0047] Step 3: Put the solution of Step 2 into an oven and heat at 95°C for 2h;

[0048] Step 4: use deionized water to perform centrifugal washing on the obtained product, and the washing times are 2 times;

[0049]Step 5: freeze-dry the product after centrifugal washing at -50° C. for 24 hours, and grind the freeze-dried bulk product to finally obtain mesoporous reduced graphene oxide powder.

[0050] figure 1 This is a scanning electron microscope picture of the mesoporous reduced graphene oxide powder obtained in Example 1 of the present invention, from which it can be seen that the surface of the lamella structure presen...

Embodiment 2

[0052] The difference between this example and Example 1 is that the concentration of the prepared ascorbic acid aqueous solution is 12 mg mL -1 , and the remaining steps are the same as in Example 1 to obtain mesoporous reduced graphene oxide.

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Abstract

The invention discloses a preparation method of a mesoporous reduced graphene oxide absorbent, and belongs to the technical field of preparation of wave-absorbing materials. Comprising the following steps: 1) preparing a reducing agent aqueous solution with certain concentration; 2) weighing a certain mass of graphene oxide powder and adding the graphene oxide powder into a reducing agent water solvent; (3) heating the solution in the step (2) in an air dry oven; 4) after heating is finished, washing the product with deionized water to remove redundant reducing agent; and 5) carrying out freeze-drying treatment on the cleaned product, and grinding the freeze-dried product to finally obtain mesoporous reduced graphene oxide powder. According to the mesoporous reduced graphene oxide prepared by the method, multiple reflection of electromagnetic waves in the material is realized, multiple loss of the electromagnetic waves is realized under the action of a structural defect polarization center, and finally, the mesoporous reduced graphene oxide shows excellent electromagnetic wave loss performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of wave absorbing materials, and in particular relates to a preparation method of a mesoporous reduced graphene oxide absorber. Background technique [0002] Reduced graphene oxide has shown great application potential in many fields due to its many preparation methods, tunable properties, and controllable morphology. [0003] In the field of microwave absorbing materials, reduced graphene oxide has more excellent electromagnetic wave loss performance than graphene, graphite, carbon nanotubes and other materials due to its abundant structural defects. Based on the above advantages of reduced graphene oxide, the pore structure of reduced graphene oxide is regulated, so that incident electromagnetic waves are reflected multiple times inside the material and are lost multiple times by polarization centers such as structural defects, and give full play to the effect of reduced graphene oxide struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/194H01Q17/00
CPCC01B32/184C01B32/194H01Q17/00C01B2204/32C01B2204/20
Inventor 叶星柯索军营程红霞文琴龙陈雅素
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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