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A kind of egg yolk-eggshell structure precious metal@hollow carbon nanosphere composite material and its preparation method and application

A technology of composite materials and precious metals, applied in the field of materials, can solve the problems of high mass transfer resistance, expensive crosslinking agent, cumbersome process, etc., and achieve the effects of cost saving, uniform and stable size and shape, and reducing environmental pollution

Active Publication Date: 2021-10-19
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of constructing a large number of rigid microporous network structures in the polymer shell, there are generally the following insurmountable shortcomings: a large amount of cross-linking agent is required for cross-linking, which seriously hinders the production of its prepared products on an industrial scale. process
The main reasons are: (1) cross-linking agent (such as FDA methylal) is expensive; (2) cross-linking agent (such as 1,2-dichloroethane 1,2-dichloromethane) seriously pollutes the environment; (3) ) After adding the cross-linking agent, the cross-linking agent needs to be removed from the reaction system, the process is cumbersome, and the experimental production cost is high; (4) the porosity of the obtained carbon shell is usually low, and the mass transfer resistance is relatively large, which is not conducive to the production of precious metal yolk function of the nucleus
These shortcomings seriously hinder the applied basic research and industrialization process of this kind of nanocomposite materials.

Method used

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  • A kind of egg yolk-eggshell structure precious metal@hollow carbon nanosphere composite material and its preparation method and application
  • A kind of egg yolk-eggshell structure precious metal@hollow carbon nanosphere composite material and its preparation method and application
  • A kind of egg yolk-eggshell structure precious metal@hollow carbon nanosphere composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for preparing an egg yolk-eggshell structure Au@hollow carbon nanosphere composite material, comprising the following steps:

[0043] (1) Preparation of Au nanoparticles: Weigh 0.0216g of HAuCl 4 Dissolve in 237.5mL deionized water, add to a 500mL three-neck flask equipped with a water guide, reflux condenser, vacuum plug, and magnet, stir vigorously with a magnet, heat to reflux, and heat to boiling; weigh 0.125g of lemon Dissolve sodium bicarbonate in 12.5mL deionized water, quickly add it to the above solution at one time, continue to heat and reflux for 30min, and cool to room temperature; after cooling, weigh 0.0042g PVP and dissolve it in 1mL deionized water, and then add it to the above cooled solution , stirred at room temperature for 24 h; the obtained nano-gold solution was centrifuged with a centrifuge (11800 rpm, time 20 min), the supernatant was removed, and the solid was dispersed in 6 mL of water to obtain a nano-gold aqueous solution.

[0044] ...

Embodiment 2

[0061] A method for preparing an egg yolk-eggshell structure Au@hollow carbon nanosphere composite material, comprising the following steps:

[0062] (1) Preparation of Au nanoparticles: Weigh 0.0216g of HAuCl 4 Dissolve it in 237.5mL deionized water, add it to a 500mL three-necked flask equipped with an aqueduct, a reflux condenser, a vacuum plug, and a magnet, stir vigorously with a magnet, heat to reflux, and heat to boiling. Weigh 0.125g of sodium citrate and dissolve it in 12.5mL of deionized water, quickly add it to the above solution at one time, continue to heat and reflux for 30min, and cool to room temperature. After cooling, weigh 0.0042g of PVP and dissolve it in 1mL of deionized water, then add it to the solution cooled above, and stir at room temperature for 24h. The obtained nano-gold solution was centrifuged with a centrifuge (11800 rpm, time 20 min), and the supernatant liquid was removed to obtain a solid dispersed in 6 mL of water.

[0063] (2) Au@SiO 2 P...

Embodiment 3

[0071] A method for preparing an egg yolk-eggshell structure Au@hollow carbon nanosphere composite material, comprising the following steps:

[0072] (1) Preparation of Au nanoparticles: Weigh 0.0216g of HAuCl 4 Dissolve it in 237.5mL deionized water, add it to a 500mL three-necked flask equipped with an aqueduct, a reflux condenser, a vacuum plug, and a magnet, stir vigorously with a magnet, heat to reflux, and heat to boiling. Weigh 0.125g of sodium citrate and dissolve it in 12.5mL of deionized water, quickly add it to the above solution at one time, continue to heat and reflux for 30min, and cool to room temperature. After cooling, weigh 0.0042g of PVP and dissolve it in 1mL of deionized water, then add it to the solution cooled above, and stir at room temperature for 24h. The obtained nano-gold solution was centrifuged with a centrifuge (11800 rpm, time 20 min), and the supernatant liquid was removed to obtain a solid dispersed in 6 mL of water.

[0073] (2) Au@SiO 2 P...

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Abstract

The invention belongs to the field of material technology, and discloses an egg yolk-eggshell structure precious metal@hollow carbon nanosphere composite material and its preparation method and application. The preparation method is: in the synthesis of noble metal @SiO 2 On the basis of core-shell nanospheres, the multi-core-shell structure noble metal @SiO was prepared by surface modification and emulsion polymerization. 2 @Polychloromethylstyrene composite nanospheres, followed by the self-crosslinking reaction of the methylene group of polychloromethylstyrene, under the condition of adding a crosslinking agent in disorder, it can be inside the shell A rich microporous network structure is built, benefiting from the rigid structure of the polychloromethylstyrene shell, after high-temperature carbonization and HF etching, the egg yolk-eggshell structure noble metal@hollow carbon nanosphere composite material is obtained. The invention can be used as high-activity p-nitrophenol reduction catalyst material, high-capacity lithium-sulfur battery limited sulfur nano-carbon carrier material, high-performance formaldehyde adsorption material and biological antibacterial material.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to an egg yolk-eggshell structure precious metal@hollow carbon nanosphere composite material and its preparation method and application. Background technique [0002] Egg yolk-eggshell structure nanosphere is a spherical hollow cavity structure composite material with a unique nanoshell layer surrounding its internal functional nanoparticles. It can take advantage of the synergistic effect of hollow nanospheres and functional nanoparticles. All have broad application prospects and are popular research directions in materials science. Carbon nanosphere composites with egg yolk-eggshell structure, especially noble metal@hollow carbon nanospheres with egg yolk-eggshell structure, are an important class of advanced materials. They have a unique nano-carbon shell and noble metal nanoparticles loaded in the nano-hollow cavity, which can play the synergistic advantages of ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F9/24B82Y30/00B82Y40/00
CPCB22F9/24B82Y30/00B82Y40/00B22F1/0553B22F1/07B22F1/16B22F1/054
Inventor 梁业如张伟财杨晨彭晶刘应亮郑明涛肖勇胡航董汉武雷炳富
Owner SOUTH CHINA AGRI UNIV
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