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Reduction-oxidation graphene/nanometer metallic silver aerogel with three-dimensional structure and preparation method

A technology of nano-metallic silver and three-dimensional structure, which is applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, chemical/physical processes, etc. Complicated problems, to achieve good catalytic performance, simple preparation process, and increase the effect of reactive area

Active Publication Date: 2016-01-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the catalyst prepared by this patent solves the problem that metal particles are prone to self-agglomeration and achieves a higher loading rate of platinum nanocatalysts, the preparation process is relatively complicated, and the reaction needs to be carried out in a heated environment, which consumes a lot of energy.

Method used

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  • Reduction-oxidation graphene/nanometer metallic silver aerogel with three-dimensional structure and preparation method
  • Reduction-oxidation graphene/nanometer metallic silver aerogel with three-dimensional structure and preparation method
  • Reduction-oxidation graphene/nanometer metallic silver aerogel with three-dimensional structure and preparation method

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Experimental program
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Effect test

Embodiment 1

[0033] The first step is to prefabricate graphene oxide. The graphene oxide is prepared in the following way: add 1gNaNO to 40ml of concentrated sulfuric acid solution in a water bath at 10°C 3 and 2g flake graphite; stir at 10°C for 0.5h, and at 15°C for 3.5h; cool to room temperature, dilute with deionized water, separate the supernatant after settling, and dry to obtain graphite after centrifugal filtration; Add 40ml of anhydrous concentrated sulfuric acid and 3g of potassium permanganate to the dried graphite, raise the temperature to 35°C and keep the reaction for 2h; stop heating, add 40ml of deionized water, stir for 1h; add 5ml of 30% hydrogen peroxide solution, and let stand overnight; 5% dilute nitric acid solution was washed several times, and then centrifugally filtered with deionized water several times to obtain the required graphite oxide dispersion.

[0034] In the second step, the above-mentioned graphene oxide solution is diluted to 1 mg / mL graphene oxide aqu...

Embodiment 2

[0039] The first step is to prefabricate graphene oxide. The graphene oxide is prepared in the following way: 1.2g KNO is added to 45ml of concentrated sulfuric acid solution in a water bath at 10°C 3 and 2.4g of graphite flakes; stirred at 11°C for 0.5h, and at 24°C for 3.5h; cooled to room temperature, diluted with deionized water, left to settle, then separated the supernatant, centrifuged and dried to obtain graphite; in a water bath at 15°C, to Add 45ml of anhydrous concentrated sulfuric acid and 4g of potassium permanganate to the above-mentioned dried graphite, heat up to 36°C and keep the reaction for 2h; stop heating, add 44ml of deionized water, stir for 1h; add 7ml of 30% hydrogen peroxide solution, and let stand overnight; Wash with 5% dilute nitric acid solution for several times, and then centrifugally filter with deionized water for several times to obtain the desired graphite oxide dispersion.

[0040] In the second step, the above-mentioned graphene oxide solu...

Embodiment 3

[0045] The first step is to prefabricate graphene oxide, and the graphene oxide is prepared by adding 1.4g KNO to 50ml of concentrated sulfuric acid solution in a water bath at 10°C 3 and 2.8g of graphite flakes; stirred at 12°C for 0.5h, and at 33°C for 3.5h; cooled to room temperature, diluted with deionized water, left to settle, then separated the supernatant, centrifuged and dried to obtain graphite; in a water bath at 15°C, to Add 50ml of anhydrous concentrated sulfuric acid solution and 6g of potassium permanganate to the above-mentioned dried graphite, heat up to 37°C and keep the reaction for 2h; stop heating, add 48ml of deionized water, stir for 1h; add 9ml of 30% hydrogen peroxide solution, and let stand overnight ; wash with 5% dilute nitric acid solution for many times, and then centrifugally filter with deionized water for many times to obtain the required graphite oxide dispersion.

[0046] In the second step, the above-mentioned graphene oxide solution is dilu...

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Abstract

The invention relates to a reduction-oxidation graphene / nanometer metallic silver aerogel with a three-dimensional structure and a preparation method thereof. The aerogel has a three-dimensional porous structure which is formed by a reduction-oxidation graphene slice layer and a polycrystal nanometer metallic sliver uniformly loaded on the reduction-oxidation graphene slice layer. The aerogel is prepared according to the preparation method which comprises the following steps: (1) uniformly mixing a soluble silver salt aqueous solution with a graphene oxide aqueous solution, thereby acquiring a pecursor solution; (2) transferring the pecursor solution into a reducing agent solution, reacting at room temperature, thereby acquiring a three-dimensional graphene / metallic silver nanometer grain hydrogel; and (3) taking out and cleaning the three-dimensional graphene / metallic silver nanometer grain hydrogel, drying, and then acquiring a target product. Compared with the prior art, the reduction-oxidation graphene / nanometer metallic silver aerogel has the advantages that the preparation method is simple, the whole reaction process is performed at a room temperature, no excessive extra energy consumption is required, and the like.

Description

technical field [0001] The invention relates to the field of nanocomposite catalysts, in particular to a three-dimensional structure reduced graphene oxide / nano metallic silver airgel and a preparation method thereof. Background technique [0002] Catalysts play a very important role in industrial production and environmental monitoring and governance. About two-thirds of chemical products and 90% of chemical production processes involve catalytic technology. Since the 1960s, when it was found that the size of the material was reduced to the nanoscale, it would exhibit special properties such as dielectric confinement effect, surface effect, macroscopic quantum tunneling effect, small size volume effect, quantum size effect, etc., nanomaterials It has become a hot spot of scientific research, especially metal nanomaterials as efficient catalysts. The size reduction of metal materials has two significant effects in the application of catalysis. First, chemical unsaturation a...

Claims

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Application Information

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IPC IPC(8): B01J23/50B01J35/10
Inventor 朱申敏娄湘虹朱呈岭潘辉张荻
Owner SHANGHAI JIAO TONG UNIV
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