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Metallic oxide/metal sulfide hollow nanospheres as well as preparation method and application thereof

A technology of metal sulfides and oxides, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve problems such as cost and resource reserve limitations, achieve simple methods, avoid compounding, and effectively compound Effect

Active Publication Date: 2015-04-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the first two are limited by cost and resource reserves due to the use of many rare metal elements.

Method used

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  • Metallic oxide/metal sulfide hollow nanospheres as well as preparation method and application thereof
  • Metallic oxide/metal sulfide hollow nanospheres as well as preparation method and application thereof
  • Metallic oxide/metal sulfide hollow nanospheres as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Titanium oxide (TiO 2 ) / bismuth sulfide (Bi 2 S 3 ) Core-shell heterojunction hollow nanospheres:

[0027] (1) Dissolve 0.34g of tetrabutyl titanate in 100mL of ethanol to obtain a titanium ion solution, then add 1g of carbon spherical templates with carboxyl and hydroxyl groups on the surface to the adsorption solution, ultrasonically disperse the spherical templates, and stir and adsorb for 12 hours After centrifugation, dry at 60°C for 12 hours to obtain the adsorbed spherical template;

[0028] (2) heat-treat the sample obtained in step (1) at 400°C for 6 hours to remove the carbon sphere template to obtain a titanium oxide hollow spherical shell;

[0029] (3) Add 20 mg of the above titanium oxide hollow spheres to 30 mL of 0.5 M glucose aqueous solution, ultrasonically disperse the hollow spheres, put them in a hydrothermal kettle, react at 160°C for 3 hours, cool to room temperature, centrifuge, Wash and dry at 60°C for 12 hours;

[0030] (4) Prepare a bismut...

Embodiment 2

[0035] Tungsten oxide (WO 3 ) / zinc sulfide (ZnS) core-shell heterojunction hollow nanospheres:

[0036] (1) Dissolve 0.4g of tungsten chloride in 60mL of deionized water to obtain a tungsten ion solution, and then add 0.7g of SiO with carboxyl and hydroxyl groups on the surface to the adsorption solution 2 Spherical template, ultrasonically disperse the spherical template, centrifuge after stirring and adsorbing for 8 hours, and dry at 70°C for 8 hours to obtain the adsorbed spherical template;

[0037] (2) Heat the sample obtained in step (1) at 400°C for 6h, then immerse it in a 5M NaOH solution at 80°C for 4h to remove SiO 2 Spherical template to obtain tungsten oxide hollow spherical shell;

[0038] (3) Add 30mg of the above tungsten oxide hollow spheres to 30mL of 0.4M glucose aqueous solution, ultrasonically disperse the hollow spheres, put them in a hydrothermal kettle, react at 170°C for 4h, cool to room temperature, and centrifuge , Wash and dry at 50°C for 8 hours...

Embodiment 3

[0043] Bismuth oxide (Bi 2 o 3 ) / cadmium sulfide (CdS) core-shell heterojunction hollow nanospheres:

[0044] (1) Dissolve 0.6g of bismuth nitrate in 80mL of ethylene glycol to obtain a bismuth ion solution, then add 0.9g of PS spherical templates with carboxyl and hydroxyl groups on the surface to the adsorption solution, ultrasonically disperse the spherical templates, and stir and adsorb for 48 hours After centrifugation, dry at 100°C for 2 hours to obtain the adsorbed spherical template;

[0045] (2) heat-treating the sample obtained in step (1) at 300° C. for 60 h to remove the PS spherical template to obtain a bismuth oxide hollow spherical shell;

[0046] (3) Add 30 mg of the above-mentioned bismuth oxide hollow spheres to 30 mL of 0.4 M glucose aqueous solution, ultrasonically disperse the hollow spheres, put them in a hydrothermal kettle, react at 180° C. for 3 h, cool to room temperature, centrifuge, Wash and dry at 100°C for 48 hours;

[0047] (4) Configure a ca...

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Abstract

The invention discloses a metallic oxide / metal sulfide core-shell heterojunction hollow nanosphere. The inner layer of the spherical shell is a metallic oxide polycrystalline layer; the outer layer of the spherical shell is a metal sulfide polycrystalline layer; a heterojunction is formed between the metallic oxide polycrystalline layer and the metal sulfide polycrystalline layer; the thickness of each layer is 10 nanometers or below; and the diameter of the hollow sphere is 100-600 nanometers. The preparation method comprises the following steps: utilizing a template adsorption method, performing stepped adsorption and subsequent hydrothermal sulfuration, thereby preparing the metallic oxide / metal sulfide core-shell heterojunction hollow nanosphere. The metallic oxide / metal sulfide core-shell heterojunction hollow nanosphere disclosed by the invention is regular in structure, the thickness of the spherical shell is controllable, the grain size of the metallic oxide and metal sulfide is 10nm or below, the crystal quality is high, and the specific surface area is larger than 200m<2> / g. The method disclosed by the invention is simple and low in cost, has extremely wide range on selection of types of metallic oxides and selection of metal sulfides and contributes to industrialized application.

Description

technical field [0001] The invention relates to a core-shell heterojunction nano hollow sphere and a preparation method thereof, in particular to a metal oxide / metal sulfide core-shell heterojunction hollow nano sphere and a preparation method thereof. Background technique [0002] Mankind is facing the crisis of depletion of coal, oil and other energy sources, and the search for new alternative energy sources has attracted the attention of all countries. Solar energy is an inexhaustible and inexhaustible energy source, and scientists are also working hard to convert solar energy into storable electrical energy and chemical energy. Hydrogen production by photocatalytic water splitting is the best way for photochemical conversion of solar energy, because hydrogen energy, as a secondary energy source, has advantages that other energy sources cannot match, such as cleanliness, safety, and high efficiency. Climate change, fuel cell technology and increasingly prominent environm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J27/047B01J27/043B01J27/051B01J35/08
Inventor 朱丽萍宋辉李亚光楼子瑞
Owner ZHEJIANG UNIV
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