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Noble metal@hollow ordered mesoporous carbon nanospheres as well as preparation method and application thereof

A precious metal and nanosphere technology, applied in the field of materials, can solve the problems of small pore size, disorderly arrangement of pore channels, hindering the basic research and industrialization process of nanocomposite materials, and achieves large pore size, which is conducive to separation and recovery, The effect of improving material properties

Inactive Publication Date: 2019-11-12
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, at present, there are still three structural defects that need to be solved urgently in the noble metal@hollow carbon nanosphere shell: (1) The channel arrangement is disordered and disordered
(2) The aperture is small
Often, the broad pore size distribution makes it difficult to correlate yolk-shell structure with performance with reasonable accuracy
Obviously, these shortcomings hinder the applied basic research and industrialization process of this kind of nanocomposite materials to a certain extent.

Method used

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  • Noble metal@hollow ordered mesoporous carbon nanospheres as well as preparation method and application thereof
  • Noble metal@hollow ordered mesoporous carbon nanospheres as well as preparation method and application thereof
  • Noble metal@hollow ordered mesoporous carbon nanospheres as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1A

[0053] Example 1 Preparation of Au@hollow ordered mesoporous carbon nanospheres

[0054] A preparation method of Au@hollow ordered mesoporous carbon nanospheres comprises the following steps:

[0055] (1) 0.125g sodium citrate, 0.0216g HAuCl 4 Dissolve in 237.5mL deionized water, heat to boiling and reflux for 30min, then weigh 0.0042g PVP and dissolve in 1mL deionized water, add to the above-mentioned reflux mixture, stir at room temperature for 24h, centrifuge the nano-gold solution after the reaction, The centrifugation speed is 11800rpm, the centrifugation time is 20min each time, and the nano-gold can be obtained by centrifuging until the supernatant is neutral, and the obtained nano-gold is dispersed in 6mL of water;

[0056] (2) the tetraethyl orthosilicate of 1.6mL is dissolved in 19mL ethanol and obtains the ethanol solution of the tetraethyl orthosilicate of 8.42% by volume fraction, then gets 6mL step (1) gained nano-gold aqueous solution, 0.8mL mass fraction is 2...

Embodiment 2A

[0064] Example 2 Preparation of Ag@hollow ordered mesoporous carbon spheres

[0065] A preparation method of Ag@hollow ordered mesoporous carbon spheres comprises the following steps:

[0066] (1) Take 50g PVP, 375mL ethylene glycol, 2g AgNO 3 Put it into a three-necked flask, mechanically stir in an oil bath at 115°C to obtain a silver sol, add a large amount of acetone (about 1800 mL) after natural cooling, and let it settle for 7-8 hours until the supernatant is colorless. Remove the colorless supernatant, dilute with 500mL ethanol, centrifuge (11500rpm, 15min), separate the nano-silver at the bottom of the centrifuge tube, continue centrifuging the upper layer containing nano-silver solution, and repeat 3 times. After the centrifugation is completed, the gained nano-silver solution is centrifuged and washed 3 times with ethanol (rotating speed 11500rpm, 15min), and finally the gained silver is dispersed in 10mL ethanol to obtain the ethanol solution of nano-silver;

[00...

Embodiment 3

[0075] Example 3 Preparation of Pt@hollow ordered mesoporous carbon spheres

[0076] A preparation method of Pt@hollow ordered mesoporous carbon spheres comprises the following steps:

[0077] (1) 4mL 7.723×10 -3 mol L -1 h 2 PtCl 6 , 51.4mg PVP, 35.2mg NaBH 4 and deionized water were added to a three-necked flask, mixed and heated to 50°C, then deionized water was slowly added dropwise, and stirred for 15 hours after the dropwise addition was completed to obtain Pt nanoparticles. Subsequently, the mixture was centrifuged at 14000 rpm and 3000 rpm for 15 min respectively, and stored in 6 mL of deionized water to obtain an aqueous solution of platinum nanoparticles.

[0078] (2) The ethyl orthosilicate of 1.6mL is dissolved in 19mL ethanol to obtain the ethanolic solution of the ethyl orthosilicate of 8.42% by volume fraction, then get the aqueous solution of 6mL step (1) gained platinum nanoparticles, 0.8mL ammoniacal liquor , add the three solutions into the three-necke...

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Abstract

The invention belongs to the technical field of materials, and discloses a noble metal@hollow ordered mesoporous carbon nanospheres as well as a preparation method and application thereof. According to the preparation method, through ''reactive interface assisted self assembly'', the reactive hollow cavity template agent, namely, noble metal@SiO2 core-shell nanospheres containing aldehyde group chemical functional groups on the surfaces are designed and synthesized, aldehyde groups on the surface of the noble metal@SiO2 nanospheres react with phenolic groups of resol in situ in the self-assembly process to form covalent bonds, so that the interaction force between a shell layer source and the hollow cavity template agent is greatly enhanced, and the surfaces of the noble metal@SiO2 nanospheres can be uniformly coated with a polymer coating; after a carbonization reaction is performed and the SiO2 template is removed, the noble metal@hollow ordered mesoporous carbon nanospheres are obtained; and the shell layer has the advantages of regular and ordered pore arrangement, a large pore size, narrow pore size distribution and the like, and the nanospheres can be used in the fields of chemical catalysis, antibiosis, electrocatalysis and the like.

Description

technical field [0001] The invention belongs to the field of material technology, and specifically relates to a noble metal@hollow ordered mesoporous carbon nanosphere and its preparation method and application. Background technique [0002] Egg yolk-eggshell nanocomposites, especially noble metal@hollow carbon nanospheres, are an important class of advanced materials. They have unique nano-shells and noble metal nanoparticles loaded in nano-hollow cavities, which can play the synergistic advantages of hollow carbon nanospheres and noble metal nanoparticles. Noble metal@hollow carbon nanospheres are used in energy, catalysis, biomedicine, environment, Fields such as nanoreactors have broad application prospects and are popular research fields in materials science. [0003] The shell structure is an important part of egg yolk-eggshell nanocomposites, and a key factor affecting the properties of such materials. Therefore, the design of advanced shell structures is the core o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15C01B32/05C01B33/18B22F1/02B22F1/00
CPCC01B32/15C01B32/05C01B33/18C01P2002/72C01P2004/03C01P2004/04C01P2004/62B22F1/07B22F1/16
Inventor 梁业如彭晶张伟财刘应亮
Owner SOUTH CHINA AGRI UNIV
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