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Preparation method of gold nanoparticle-graphene-melamine sponge composite material

A technology of melamine sponge and gold nanoparticles, applied in the direction of analyzing materials, electrochemical variables of materials, chemical instruments and methods, etc., can solve the problems of irreversible agglomeration between particles, high surface energy, hindering the contact between active sites and reactants, etc. Achieve the effect of stable composite product, good repeatability and lower detection limit

Inactive Publication Date: 2018-03-23
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high surface energy, its long-term storage will cause irreversible agglomeration between particles; at the same time, the active agent on the surface of gold nanoparticles will also hinder the contact between the active site and the reactant.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] Preparation of graphene oxide: Add 18-20g of potassium permanganate to 3-4g of ground graphite powder and stir fully with a glass rod; add the above mixture to 360-400ml of concentrated sulfuric acid and 40-50ml of concentrated phosphoric acid In the mixture, stir at 50-60°C for 12-14h; take 10-15ml of hydrogen peroxide and add appropriate amount of deionized water, seal it and put it in the freezer of the refrigerator to make ice; add the oxidized graphene to the above-mentioned hydrogen peroxide containing In the ice, to remove excess sulfate ions; the graphene after the removal of sulfate ions is repeatedly ionized, and the graphene oxide aqueous solution required for the experiment can be obtained.

[0021] Preparation of mixed solution of chloroauric acid and graphene oxide: prepare 1-2 mg / ml graphene oxide solution and 0.01-0.02 mg / ml chloroauric acid solution and self-assemble at room temperature for 2-4 hours according to the volume ratio of 20:1.

[0022] Prepa...

experiment approach 1

[0025] (1) Add 18g of potassium permanganate to 3g of ground graphite powder, and stir fully with a glass rod; add the above mixture to 360ml of concentrated sulfuric acid and 40ml of concentrated phosphoric acid mixture, and stir at 50°C for 12h; Take 10ml of hydrogen peroxide and add an appropriate amount of deionized water, seal it and put it in the freezer of the refrigerator to make ice; add the oxidized graphene to the ice containing hydrogen peroxide to remove excess sulfate ions; After the graphene is repeatedly ionized, the graphene oxide aqueous solution required for the experiment can be obtained.

[0026] (2) Prepare 1 mg / ml graphene oxide solution and 0.01 mg / ml chloroauric acid solution and self-assemble at room temperature for 2 hours according to the volume ratio of 20:1.

[0027] (3) Soak the cleaned melamine sponge with a size of 2.0×2.0×2.0cm in the mixed solution of chloroauric acid and graphene oxide, squeeze out the excess mixed solution, and then place i...

experiment approach 2

[0029] (1) Add 19g of potassium permanganate to 3.5g of ground graphite powder, and stir fully with a glass rod; add the above mixture to 380ml of concentrated sulfuric acid and 45ml of concentrated phosphoric acid mixture, and stir at 55°C for 13h Get 13ml of hydrogen peroxide and add an appropriate amount of deionized water, seal it and place it in the freezer compartment of the refrigerator to make ice; add the oxidized graphene to the above-mentioned ice containing hydrogen peroxide to remove excess sulfate ions; The ionized graphene undergoes repeated ions to obtain the graphene oxide aqueous solution required for the experiment.

[0030] (2) Prepare 1.5 mg / ml graphene oxide solution and 0.015 mg / ml chloroauric acid solution and self-assemble at room temperature for 3 hours according to the volume ratio of 25:1.

[0031] (3) Soak the cleaned melamine sponge with a size of 2.0×2.0×2.0cm in the mixed solution of chloroauric acid and graphene oxide, squeeze out the excess mi...

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Abstract

The invention provides a preparation method of a gold nanoparticle-graphene-melamine sponge composite material. The method mainly comprises the following process steps: 1, preparing a graphene oxide solution by using an improved Hummers method; 2, soaking a piece of melamine sponge, which is cleaned and has a certain size, into mixed liquid of chloroauric acid and graphene oxide, taking out the soaked melamine sponge, and drying; 3, reducing the chloroauric acid and the graphene oxide at the same time by using ascorbic acid, and preparing the recyclable gold nanoparticle-graphene-melamine sponge composite material. The method realizes one-step reduction of the chloroauric acid and the graphene oxide, and has the advantages of simple process, good repeatability, environment friendliness andstable composite product; the prepared gold nanoparticles and graphene sheets are evenly distributed on a framework of the melamine sponge, and an obvious agglomeration phenomenon does not occur. Thegold nanoparticle-graphene-melamine sponge composite material can be repeatedly used in a recycling way as a catalyst for degrading industrial pollutants, can be also used as an electrode material for electrochemical sensors, can be used for detecting the existence of low-concentration H2O2 for a plurality of times, and achieves the aims of increasing response sensitivity and reducing a detectionlimit.

Description

technical field [0001] The invention provides a simple and rapid method for preparing a recyclable gold nanoparticle-graphene-melamine sponge composite material, which belongs to the technical field of material chemical preparation. Background technique [0002] Gold nanoparticles have been widely used in the field of catalysis because of their small particle size, high specific surface area, and many reactive sites. However, due to the high surface energy, its long-term storage will cause irreversible agglomeration between the particles; at the same time, the active agent on the surface of gold nanoparticles will also hinder the contact between the active site and the reactant. These factors will inevitably reduce the catalytic activity of gold particles in the aqueous system, therefore, it is necessary to find a suitable substrate material to support it. Graphene is an ideal carrier for loading gold nanoparticles due to its high specific surface area, high electrical cond...

Claims

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Application Information

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IPC IPC(8): B01J31/06G01N27/30
CPCB01J31/06G01N27/308
Inventor 郭新立刘闯刘园园金开陈忠涛殷亮亮张伟杰祝龙
Owner SOUTHEAST UNIV
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