Graphene-noble metal nanoparticle compound hydrogel and aerogel and preparing method and application thereof

A composite hydrogel and composite aerogel technology, applied in the field of graphene-precious metal inorganic nanoparticle composite hydrogel, can solve problems such as inability to select, and achieve the effects of good electrical conductivity, simple operation, and avoidance of aggregation

Active Publication Date: 2017-01-04
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention overcomes the preparation and research of graphene-noble metal inorganic nanoparticle composite airgel in the prior art, which is rarely reported, and cannot p...

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  • Graphene-noble metal nanoparticle compound hydrogel and aerogel and preparing method and application thereof
  • Graphene-noble metal nanoparticle compound hydrogel and aerogel and preparing method and application thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0049] In the following examples, the graphite used is provided by Sigma-Aldrich Company. The graphite used is flake graphite with an average particle size of 50-500 μm, and the rest of the raw materials are provided by Sinopharm Chemical Reagent Co., Ltd.

[0050] Example 1

[0051] (1) The preparation method of graphene oxide dispersion liquid:

[0052] Add 10g of graphite, 150ml of 98% concentrated sulfuric acid, and 50ml of 65% concentrated nitric acid into a 500ml Erlenmeyer flask and stir at room temperature for 24 hours. Slowly pour it into 1L of water to collect the solid, wash it 3 times, and dry it at 80°C for 4 hours. Repeat the pre-oxidation process twice. The dried pre-oxidized graphite was put into a box furnace and thermally expanded at 900°C for 10s to obtain thermally expanded graphite oxide. In a 500ml wide-mouth Erlenmeyer flask, mix 5g of heat-expandable graphite oxide with 300ml of 98% concentrated sulfuric acid, 4.2g of K 2 S 2 o 8 , 6.2g of phosphor...

Embodiment 2

[0058] (1) The preparation method of the graphene oxide dispersion is the same as in Example 1.

[0059] (2) Graphene oxide dispersion liquid, chloroauric acid, ruthenium trichloride, ethanol, polyvinyl alcohol, ammoniacal liquor that step (1) is prepared are mixed to prepare 4mg / ml graphene oxide mixed solution; Wherein, graphene oxide The mass ratio to the total amount of the noble metal compound is 1:0.05 (the mass ratio of chloroauric acid and ruthenium trichloride is 1:1); the mass percentage of ethanol in the graphene oxide mixed solution is 20%, and polyvinyl alcohol accounts for graphite oxide The mass percentage of the olefin mixed solution is 1%; in the graphene oxide mixed solution, the mass ratio of graphene oxide to ammonia is 1:50.

[0060] (3) Inject the graphene oxide mixed solution obtained in step (2) into a thin tubular reactor, and irradiate the unsealed (air atmosphere) irradiation reactor with a cobalt 60 gamma ray source to obtain graphene-noble metal na...

Embodiment 3

[0064] (1) The preparation method of the graphene oxide dispersion is the same as in Example 1.

[0065] (2) Graphene oxide dispersion liquid, chloroauric acid and methyl alcohol, propylene glycol, butanol and methylamine are mixed to prepare 8mg / ml graphene oxide mixed solution that step (1) makes; Wherein, graphene oxide and chloroauric acid The mass ratio of the graphene oxide mixed solution is 1:0.01; the mass percentage of methanol, propylene glycol and butanol in the graphene oxide mixed solution is 5%, and the mass ratio of graphene oxide and methylamine in the graphene oxide mixed solution is 1:1.

[0066] (3) Inject the graphene oxide mixed solution obtained in step (2) into a cylindrical irradiation reactor, and ventilate argon to remove oxygen; irradiate the sealed irradiation reactor with a cobalt 60 gamma ray source to obtain graphene-gold nano Particle composite hydrogel; wherein, the dose is 600kGy, and the dose rate of the irradiation reaction is 10kGy / hour.

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Abstract

The invention discloses a method for preparing graphene-noble metal inorganic nanoparticle compound hydrogel. The method comprises the steps of 1, evenly mixing oxidized graphene dispersion liquid, a noble metal compound and a reducing agent to obtain mixed liquid; 2, irradiating the mixed liquid with high-energy ray for irradiation reaction. The invention further provides compound hydrogel prepared with the method, and aerogel prepared after drying. According to the method for preparing the hydrogel, the in-situ reduction self-assembly method is adopted by means of the irradiation technique, operation is easy, and environment friendliness is realized; the compound aerogel is of a macroporous structure, noble metal is evenly dispersed and adsorbed on the surface of oxidized graphene, functions of graphene aerogel and functions of noble metal nanoparticles are combined, electric conductivity is high during organic solvent adsorption, corresponding electro-catalysis reaction is made feasible, and the method has great potential application value in organic reaction catalyzed synthesis including micromolecule electroanalysis and electro-catalysis, synthesis of petroleum organic intermediate and other fields.

Description

technical field [0001] The invention relates to a graphene-noble metal inorganic nanoparticle composite hydrogel, aerogel and a preparation method and application thereof. Background technique [0002] From the perspective of practical application, it is undoubtedly a very valuable research direction to transform nanographene materials into macrostructure materials. Combining multifunctional noble metal inorganic nanoparticles with macroscopic graphene structures to prepare macroscopic graphene-noble metal inorganic nanoparticle composites will undoubtedly bring greater beneficial value to the industry. Noble metals include Au, Ag, and platinum group metals Ru, Rh, Pd, Os, Ir, and Pt, which are several expensive metals. Noble metal nanoparticles have excellent optical, electrical, magnetic and catalytic properties different from bulk materials, have a large specific surface area, strong electrical conductivity and reactivity, and many surface active sites. Analytical and e...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30
Inventor 李吉豪李景烨李林繁张阔贾娜
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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