Core-shell composite nanomaterial with hollow silicon sphere as shell and nanometer metal oxide as core, and its preparation method and application

A composite nanomaterial and nanometal technology, which is applied in the field of new shell-core composite nanomaterials to achieve the effects of large potential, high catalytic activity and controllable thickness

Active Publication Date: 2022-05-17
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method of preparing hollow silicon spheres as shells and core-shell materials with adjustable thickness has not been reported at home and abroad.

Method used

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  • Core-shell composite nanomaterial with hollow silicon sphere as shell and nanometer metal oxide as core, and its preparation method and application
  • Core-shell composite nanomaterial with hollow silicon sphere as shell and nanometer metal oxide as core, and its preparation method and application
  • Core-shell composite nanomaterial with hollow silicon sphere as shell and nanometer metal oxide as core, and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In step (1), at 20°C, 0.3g of oxide Mn 3 o 4 The nanorods were placed in a reaction vessel filled with 30mL of ethanol, and ultrasonicated for 10min until the oxide Mn 3 o 4 Disperse completely to obtain black emulsion A;

[0043] Step (2), at 20°C, dissolve 30wt% ammonia water in black emulsion A so that the concentration of ammonia water is 20mM, and sonicate for 10min to obtain black emulsion B;

[0044] Step (3), at 20°C, under stirring conditions, dissolve the tetraethyl orthosilicate solution in ethanol to form a transparent solution C;

[0045] Step (4), at 20°C, under stirring conditions, add the C solution dropwise to the B solution to form a suspension D, wherein the atomic ratio of the Si element to the Mn element in the suspension is 0.4:1 ;

[0046] Step (5), after stirring the above mixture D for 6 hours, centrifuge, wash with deionized water and absolute ethanol successively, after each washing 4 times, place the obtained product in an oven at 80°C f...

Embodiment 2

[0052] Change the concentration of ammonia water in step (2) in Example 1 to 100mM, and the others are the same as in Example 1, and finally prepare the dry hollow silicon sphere layer as the shell and the core-shell composite nanomaterial SiO with the rod-shaped oxide as the core. 2 @Mn 3 o 4 -0.4.

[0053] image 3 (a) is the prepared SiO of embodiment 2 2 @Mn 3 o 4 Common TEM image of -0.4 core-shell composite nanomaterials, showing SiO 2 @Mn 3 o 4 -0.4 The microstructure is a regular rod, and its internal Mn 3 o 4 The nanorod is the core, and the outer hollow silicon sphere layer is the shell.

Embodiment 3

[0055] Change tetraethylammonium hydroxide into tetrapropylammonium hydroxide in step (5) in Example 1, and others are the same as Example 1, and finally prepare the dry hollow silicon sphere layer as the shell and the rod-shaped oxide as the core. Core-shell composite nanomaterial SiO 2 @Mn 3 o 4 -0.4.

[0056] image 3 (b) is the prepared SiO of embodiment 3 2 @Mn 3 o 4 Common TEM image of -0.4 core-shell composite nanomaterials, showing SiO 2 @Mn 3 o 4 -0.4 The microstructure is a regular rod, and its internal Mn 3 o 4 The nanorod is the core, and the outer hollow silicon sphere layer is the shell.

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Abstract

The invention discloses a core-shell type composite nano material with a hollow silicon sphere layer as a shell and a nanometer metal oxide as a core, as well as a preparation method and application thereof. When the present invention adopts alkaline solution for heat treatment, desiliconization reaction and silicon recrystallization reaction occur simultaneously. OH dissociated from alkaline substances ‑ Part of the silicon in the dense silicon layer outside the shell-core structure is dissolved, and the dissociated large-size cations are adsorbed on the outer surface of the material, preventing OH ‑ The dissolution effect and the recrystallization of dissolved silicon in the adjacent liquid phase to generate crystalline silicon, this selective desiliconization around the adsorbed cations easily dissolves the silicon in the outer dense silicon layer, and at the same time achieves recrystallization to form a hollow structure. The core-shell material of the invention has better catalytic activity in the Fenton reaction, and has great application value in controlling or restoring the ecological environment.

Description

technical field [0001] The present invention relates to the field of preparation of new-type core-shell composite nanomaterials and the catalytic degradation of organic matter at normal temperature, in particular to a novel core-shell composite nanomaterial with hollow silicon spheres as shells and nano-metal oxides as cores and its method and application in Catalytic applications in the Fenton reaction. Background technique [0002] In recent years, composite nanomaterials with a core-shell structure have attracted everyone's attention because they have the advantages of both shell materials and core materials. People often obtain the expected better performance through precise adjustment of related factors such as composition and morphology. However, at present, the shell of most core-shell materials cannot solve the problem of mass transfer, resulting in the inability of ions or molecules to easily diffuse into the inner space of the material, reducing the probability of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J23/745B01J23/755B01J23/889C02F1/72C02F101/30
CPCB01J23/34B01J23/745B01J23/755B01J23/8892B01J35/0086C02F1/722C02F2101/40Y02E60/10
Inventor 刘娟娟邹世辉陈昌磊
Owner HANGZHOU DIANZI UNIV
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