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Extremely small particle size nano-silver loaded graphene aerogel and preparation method and application thereof

A graphene airgel and nano-silver technology, which is applied in the direction of airgel preparation, organic compound preparation, amino compound preparation, etc., can solve the problem of not effectively controlling silver agglomeration, and achieve less agglomeration, convenient recycling, and catalytic efficiency high effect

Active Publication Date: 2017-08-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it still does not effectively control silver agglomeration, and the particle size of nano-silver is 25-40nm

Method used

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  • Extremely small particle size nano-silver loaded graphene aerogel and preparation method and application thereof
  • Extremely small particle size nano-silver loaded graphene aerogel and preparation method and application thereof
  • Extremely small particle size nano-silver loaded graphene aerogel and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0025] In the present embodiment, the specific steps of preparing the graphene airgel supported by nano-silver are as follows:

[0026] (1) Mix 1 mL of 4 mg / mL graphene oxide solution with 1 mL of 24 mg / mL ascorbic acid solution in equal volumes, and form a reducing environment after ultrasonication for 5 minutes to prevent the oxidation of nano-silver in subsequent steps.

[0027] (2) Mix 0.1 mL of ammonia water and 0.5 mg of silver nitrate to obtain a silver ammonia solution, and add it to the solution in step 1. Among them, ammonia water is used as a complexing agent to form a complex between silver ions and ammonia, which reduces the concentration of silver ions, thereby reducing its oxidation ability accordingly, so that the reduction reaction can proceed smoothly.

[0028] (3) Add 0.02 mL of hydrazine hydrate solution into the solution finally obtained in step (2) for complete reduction, and the mass ratio of silver nitrate in the final mixed solution is about 0.025%. T...

Embodiment 2

[0031] In the present embodiment, the specific steps of preparing the graphene airgel supported by nano-silver are as follows:

[0032] (1) Mix 1 mL of 4 mg / mL graphene oxide solution with 1 mL of 24 mg / mL ascorbic acid solution in equal volumes, and form a reducing environment after ultrasonication for 5 minutes to prevent the oxidation of nano-silver in subsequent steps.

[0033] (2) Mix 0.2 mL of ammonia water and 1 mg of silver nitrate to obtain a silver ammonia solution, and add it to the solution in step 1. Among them, ammonia water is used as a complexing agent to form a complex between silver ions and ammonia, which reduces the concentration of silver ions, thereby reducing its oxidation ability accordingly, so that the reduction reaction can proceed smoothly.

[0034] (3) Add 0.04 mL of hydrazine hydrate solution into the solution of step (2) for complete reduction, and the mass ratio of silver nitrate in the final mixed solution is about 0.05%. The whole process was...

Embodiment 3

[0037] In the present embodiment, the specific steps of preparing the graphene airgel supported by nano-silver are as follows:

[0038] (1) Mix 1 mL of 4 mg / mL graphene oxide solution with 1 mL of 24 mg / mL ascorbic acid solution in equal volumes, and form a reducing environment after ultrasonication for 5 minutes to prevent the oxidation of nano-silver in subsequent steps.

[0039] (2) Mix 0.3 mL of ammonia water and 1.5 mg of silver nitrate to obtain a silver ammonia solution, and add it to the solution in step 1. Among them, ammonia water is used as a complexing agent to form a complex between silver ions and ammonia, which reduces the concentration of silver ions, thereby reducing its oxidation ability accordingly, so that the reduction reaction can proceed smoothly.

[0040] (3) Add 0.06 mL of hydrazine hydrate solution into the solution of step (2) for complete reduction, and the mass ratio of silver nitrate in the final mixed solution is about 0.075%. The whole process ...

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Abstract

The invention discloses an extremely small particle size nano-silver loaded graphene aerogel, a preparation method and an application thereof. According to the preparation method, graphene serves as a substrate for forming aerogel under the conditions of normal temperature and pressure and ultrasound, and the nano-silver serves as a catalyst to be loaded on the graphene; the particle size of the nano-silver in the aerogel is about 1nm; the nano-silver has superhigh catalytic conversion rate for nitrobenzene and m-dinitrobenzene; and the particle size of the nano-silver can be adjusted and controlled by adjusting the loading capacity of the nano-silver. According to the properties, the nano-silver catalyst is synthesized by adopting a green and environment-protection method, has a superhigh catalytic performance for pollutants, is convenient to recover after being used and can be applied to the fields of environmental protection, chemical engineering and the like.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a very small nano-silver loaded graphene aerogel and a preparation method and application thereof. Background technique [0002] Nano-silver catalysts play a very important role in industrial production and environmental governance. However, there are many limitations in the use of nano-silver catalysts. For example, due to its high specific surface energy, it is easy to agglomerate, which hinders its catalytic activity; it is difficult to recycle after use, which limits its reuse and increases its diffusion into the environment. risk. Graphene has excellent physical and chemical properties, such as high specific surface area, high electrical conductivity, high mechanical strength, and easy surface modification, etc. Graphene oxide can be obtained by connecting abundant oxygen-containing functional groups to its surface. Graphene is a suitable substrate material ...

Claims

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Application Information

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IPC IPC(8): B01J23/50B01J13/00C07C209/36C07C211/46C07C211/51A62D3/37A62D101/26
CPCA62D3/37B01J13/0091C07C209/36B01J23/50A62D2101/26B01J35/23B01J35/40C07C211/46C07C211/51
Inventor 陈宝梁沈意
Owner ZHEJIANG UNIV
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