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

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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[0032] Example 1

[0033] In the first step, the graphene oxide is prefabricated, and the graphene oxide is prepared by the following method: 1g NaNO is added to 40ml concentrated sulfuric acid solution under the condition of 10℃ water bath 3 And 2g flake graphite; stir at 10°C for 0.5h, 15°C for 3.5h; cool to room temperature, dilute with deionized water, place to settle, separate the supernatant, centrifuge and filter and dry to obtain graphite; under 15°C water bath, 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 and stir for 1h; add 5ml of 30% hydrogen peroxide solution and let stand overnight; Washing with 5% dilute nitric acid solution several times, and then centrifugally filtering with deionized water several times to obtain the desired graphite oxide dispersion.

[0034] The second step is to dilute the above graphe...

Example Embodiment

[0038] Example 2

[0039] In the first step, the graphene oxide is prefabricated. The graphene oxide is prepared by the following method: Under the condition of a water bath at 10°C, 1.2g KNO is added to 45ml of concentrated sulfuric acid solution 3 And 2.4g flake graphite; stirring at 11°C for 0.5h, 24°C stirring for 3.5h; cooling to room temperature, diluting with deionized water, leaving to settle, separating the supernatant, centrifugal filtration and drying to obtain graphite; under 15°C water bath, Add 45ml of anhydrous concentrated sulfuric acid and 4g of potassium permanganate to the dried graphite. The temperature is raised to 36°C and the reaction is maintained for 2h; stop heating, add 44ml of deionized water and stir for 1h; add 7ml of 30% hydrogen peroxide solution and let stand overnight; Wash with 5% dilute nitric acid solution several times, and then centrifuge and filter several times with deionized water to obtain the desired graphite oxide dispersion.

[0040] Th...

Example Embodiment

[0044] Example 3

[0045] In the first step, the graphene oxide is prefabricated, and the graphene oxide is prepared by the following method: Add 1.4g KNO to 50ml concentrated sulfuric acid solution under the condition of 10℃ water bath 3 And 2.8g flake graphite; stir at 12°C for 0.5h, 33°C for 3.5h; cool to room temperature, dilute with deionized water, set aside and separate the supernatant, centrifuge and filter and dry to obtain graphite; under 15°C water bath, Add 50ml of anhydrous concentrated sulfuric acid solution and 6g of potassium permanganate to the above-mentioned dried graphite, increase the temperature to 37°C and keep the reaction for 2h; stop heating, add 48ml of deionized water and stir for 1h; add 9ml of 30% hydrogen peroxide solution and let stand overnight ; Wash with 5% dilute nitric acid solution several times, and then centrifuge and filter several times with deionized water to obtain the desired graphite oxide dispersion.

[0046] The second step is to 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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