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SiO2/TiO2 hollow compound structural material as well as preparation method and uses thereof

A composite structure and hollow technology, which is applied in the field of inorganic nanomaterial preparation, can solve the problems of application limitations and achieve the effects of improved utilization rate, simple manufacturing method and superior performance

Inactive Publication Date: 2008-07-30
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But TiO 2 The photocatalytic activity of TiO must be irradiated by ultraviolet light. When the electronic valence band jumps to the conduction band and forms electron-hole pairs, it can be obtained; after stopping the light for a period of time, its surface returns to the hydrophobic state, making TiO 2 The application of the
The utilization rate of sunlight energy by titanium dioxide photocatalysts currently used is only 3%-5%. How to broaden the spectrum utilization range and utilization rate of titanium dioxide photocatalysts has become a difficult problem before people.

Method used

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  • SiO2/TiO2 hollow compound structural material as well as preparation method and uses thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A SiO 2 / TiO 2 The hollow composite structural material is prepared by the following steps,

[0038] 1) Preparation of carbon nanospheres

[0039] Weigh 4 parts by weight of glucose, dissolve it in 40 parts by volume of water, transfer it to a stainless steel reaction kettle lined with polytetrafluoroethylene, close the reaction kettle, and place it in a resistance furnace at 160°C for 12 hours. After the reaction is completed, cool it naturally To room temperature, pour out the product in the kettle, centrifuge at 10,000 rpm for 3 minutes, take the precipitate, wash with deionized water and absolute ethanol three times each, and vacuum dry at 60°C for 4 hours to obtain a particle size of 200nm monodisperse carbon nanospheres;

[0040] 2) Carbon nanospheres coated with silica

[0041] Weigh 0.05 parts by weight of carbon nanospheres prepared in step (1), disperse them in a solution mixed with 20 parts by volume of ethanol and 4 parts by volume of water, add 1.5ml of...

Embodiment 2

[0047] A SiO 2 / TiO 2 The application of hollow composite structural materials is prepared into SiO by the following method 2 / TiO 2 Hollow composite structural material membrane to achieve:

[0048] 1)SiO2 2 / TiO 2 Fabrication of Hollow Composite Structural Films

[0049] SiO prepared by Example 1 2 / TiO 2 The hollow composite structure material is ultrasonically dispersed in water to form a solution with a mass fraction of 0.4%, and a common glass slide is used as a substrate to prepare a layer of thin film by vertical pulling method.

[0050] 2) Anneal the film prepared by step 1) at 450°C for 1h to obtain SiO 2 / TiO 2 Hollow Composite Structural Material Membranes.

Embodiment 3

[0052] A SiO 2 / TiO 2 The hollow composite structural material is prepared by the following steps,

[0053] 1) Preparation of carbon nanospheres

[0054] Weigh 8 parts by weight of glucose, dissolve it in 40 parts by volume of water, transfer it to a stainless steel reaction kettle lined with polytetrafluoroethylene, close the reaction kettle, and place it in a resistance furnace at 200°C for 4 hours of reaction. After the reaction is completed, cool it naturally To room temperature, pour out the product in the kettle, centrifuge at 10,000 rpm for 3 minutes, take the precipitate, wash with deionized water and absolute ethanol three times each, and vacuum dry at 60°C for 4 hours to obtain a particle size of 200nm monodisperse carbon nanospheres;

[0055] 2) Carbon nanospheres coated with silica

[0056] Weigh 0.1 parts by weight of the carbon nanospheres prepared in step (1), disperse them in a solution mixed with 40 parts by volume of ethanol and 8 parts by volume of water...

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Abstract

The invention relates to a hollow material with a composite structure of SiO2 / TiO2 and a preparation method and application thereof. By applying hydrothermal reaction, glucose solution is carbonized at 160 to 200 DEG C to obtain carbon nanometer spheres with a particle size of 200nm to 1um; the carbon nanometer spheres are used as hard templates; hydrolysis of ethyl orthosilicate and tetrabutyl titanate are used for wrapping the SiO2 and TiO2 on the surfaces of the carbon spheres; the obtained product is annealed for an hour at the temperature of 450 to 500 DEG C; the carbon spheres are removed, and the hollow structure of silicon dioxide / titanium dioxide is obtained; then the obtained product is prepared into membranes with different layers by applying a czochralski method and a spin coating method respectively. The method is reasonable in design and simple in technology; besides, the hollow structure has even size-distribution and controllable particle size; the hollow silicon dioxide can remarkably improve the transmission rate of the membranes; the composite membranes are widely applied to fields such as windshields, various lenses and agricultural greenhouses.

Description

technical field [0001] The present invention relates to a SiO 2 / TiO 2 The hollow composite structural material and its preparation method and application belong to the technical field of inorganic nanometer material preparation. Background technique [0002] The study by Fujishima et al. of the University of Tokyo found that TiO 2 Under sunlight irradiation, TiO 2 After being irradiated by ultraviolet light, the photogenerated electrons and holes make TiO 2 Surface adsorbed oxygen is reduced and water is oxidized to form O 2 And OH active groups, these active groups are enough to decompose organic dirt, microorganisms and bacteria on the glass surface into inorganic substances such as carbon dioxide and water, so as to achieve the purpose of self-cleaning. In 1972, Wang and Fujishima of the University of Tokyo reported in Nature (Nature, 1972, 238, 37.) the phenomenon that the surface of titanium oxide induced by ultraviolet light produces superhydrophilicity, that is,...

Claims

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Application Information

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IPC IPC(8): C03C17/23
Inventor 占金华范迎菊
Owner SHANDONG UNIV
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