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Co3O4@Au nano catalytic composite material and preparation method thereof

A composite material and nano-catalysis technology, which is applied in the field of Co3O4@Au nano-catalytic composite materials and their preparation, can solve the problem that the size of Au particles is difficult to control well, the surface distribution of Au particles is uneven, and it is difficult to control the loading of Au, etc. problem, to achieve the effect of easy large-scale production, low cost and short time

Inactive Publication Date: 2019-06-07
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing catalytic composite materials have a series of problems such as cumbersome preparation steps, poor stability, and low catalytic degradation efficiency.
Guo Shuailong et al. (Au / Co 3 o 4 Preparation, characterization and hydrogenation catalytic performance of [J]. Noble Metals, 2018,39(02):54-58.) Although the impregnation method reported can prepare Au / Co 3 o 4 , but there are the following problems: the size of Au particles is difficult to control well; the distribution of Au particles on the surface is not uniform; it is difficult to ensure that all Au particles are attached to the Co 3 o 4 surface, so it is difficult to control the loading of Au

Method used

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  • Co3O4@Au nano catalytic composite material and preparation method thereof
  • Co3O4@Au nano catalytic composite material and preparation method thereof
  • Co3O4@Au nano catalytic composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of Co 3 o 4 The preparation method of @Au nanometer catalytic composite material comprises the following steps:

[0038] (1) will Co 3 o 4 Nanoparticles were sonicated for 20min and dispersed in HAuCl 4 The solution was made into a 0.1mg / mL solution, aged for 15h, when Co 3 o 4 After fully adsorbing Au(III) ions and their compounds on the surface, centrifuge to obtain the precursor, and rinse the precursor with deionized water for 3 times;

[0039] (2) Disperse the precursor rinsed in step (1) in 3 mL of NaBH with a concentration of 10 mg / mL 4 In the solution, stir for 6 minutes so as to fully reduce Au(III) ions and their compounds into Au particles, and then centrifuge the reaction solution to obtain a solid product;

[0040] (3) Rinse the solid product obtained in step (2) with deionized water for 3 times, and then dry it at 60°C for 4 hours to obtain Co 3 o 4 @Au nanocatalytic composites.

Embodiment 2

[0042] A kind of Co 3 o 4 The preparation method of @Au nanometer catalytic composite material comprises the following steps:

[0043] (1) will Co 3 o 4 Ultrasound the nanoparticles for 100min, disperse in the gold trichloride solution to make a 1.0mg / mL solution, and age for 24h, when Co 3 o 4 After the surface is fully adsorbed with Au(III) ions and compounds, the precursor is obtained by centrifugation, and the precursor is rinsed twice with deionized water;

[0044] (2) Disperse the precursor after rinsing in step (1) in 5 mL of sodium ascorbate solution with a concentration of 12 mg / mL, and stir for 8 min to fully reduce Au(III) ions and compounds into Au particles. The liquid was centrifuged to obtain a solid product;

[0045] (3) After rinsing the solid product obtained in step (2) twice with deionized water, dry it at 80°C for 2 hours to obtain Co 3 o 4 @Au nanocatalytic composites.

Embodiment 3

[0047] A kind of Co 3 o 4 The preparation method of @Au nanometer catalytic composite material comprises the following steps:

[0048] (1) will Co 3 o 4 Nanoparticles were sonicated for 1min and dispersed in HAuCl 4 10mg / mL solution was prepared in the solution, aged for 1h, when Co 3 o 4 After the surface is fully adsorbed with Au(III) ions and compounds, the precursor is obtained by centrifugation, and the precursor is rinsed twice with deionized water;

[0049] (2) Disperse the precursor rinsed in step (1) in 10 mL of sodium citrate solution with a concentration of 15 mg / mL and stir for 10 min to fully reduce Au(III) ions and compounds into Au particles. The reaction solution was centrifuged to obtain a solid product;

[0050] (3) Rinse the solid product obtained in step (2) with deionized water for 3 times, and then dry it at 80°C for 2 hours to obtain Co 3 o 4 @Au nanocatalytic composites.

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Abstract

The invention belongs to the technical field of catalysts, and particularly relates to a Co3O4@Au nano-catalytic composite material and a preparation method thereof. The method comprises the followingsteps: dispersing nano Co3O4 into a solution containing Au (III) ions and compounds thereof, aging the mixture for a period of time, centrifuging and separating the mixture after the Au (III) ions and the compounds thereof are fully adsorbed on the surface of Co3O4, and rinsing the centrifuged compound with deionized water; dispersing the rinsed compound in a reducing solution with a certain concentration, performing complete reaction, and then centrifugally separating the mixture; rinsing the obtained product with deionized water for several times, and drying the product to obtain the Co3O4@Au nano-catalytic composite material. The method disclosed by the invention can be used for quickly and effectively preparing the nano-catalytic composite material. The prepared Co3O4@Au nano catalytic composite material has good catalytic activity, and has a wide application prospect in the fields of supercapacitors and the like.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a Co 3 o 4 @Au nanocatalytic composite material and its preparation method. Background technique [0002] co 3 o 4 As a nanomaterial, it is widely used in heterogeneous catalysts, electrochromic devices, supercapacitors, solid-state sensors, gas adsorption, gas sensors, rotatable magnets and other fields. co 3 o 4 Usually composed of various polycrystals, they have different exposed crystal faces and active sites, but these active sites show different reactivity, usually with low catalytic activity. Therefore, in order to improve the catalytic activity of the material, it is necessary to design and synthesize new catalytic composite materials. [0003] The new nano-catalytic composite material essentially modifies noble metals on the surface of the material. Compared with traditional catalytically modified materials, the composite material can enhance the catalytic acti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89
Inventor 李志华李娜郄元元曹国炜张敏罗楠楠
Owner SHANDONG NORMAL UNIV
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