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High-crystallinity titanium dioxide-silica nano composite material with regular mesoporous structure as well as preparation method and application thereof

A nanocomposite and mesoporous structure technology, applied in the field of physical chemistry, can solve problems such as specific surface area and pore volume decrease, pore wall collapse, affecting material structure and catalytic performance, etc., to reduce internal mass transfer resistance and increase contact probability , the effect of excellent catalytic performance

Inactive Publication Date: 2014-04-02
SHAOXING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the biggest problem in the preparation of crystalline mesoporous metal oxides is the amorphous pore wall structure caused by the low hydrothermal treatment temperature (100°C). The crystallization of the structure, but this process often causes a large amount of collapse of the pore wall, and the specific surface area and pore volume decrease. The occurrence of this phenomenon directly affects the structure and catalytic performance of the material.

Method used

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  • High-crystallinity titanium dioxide-silica nano composite material with regular mesoporous structure as well as preparation method and application thereof
  • High-crystallinity titanium dioxide-silica nano composite material with regular mesoporous structure as well as preparation method and application thereof
  • High-crystallinity titanium dioxide-silica nano composite material with regular mesoporous structure as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Using F127 as a template to synthesize OM-SiO at 180°C 2 -TiO 2 Nanocomposites (OM stands for regular mesoporous, SiO 2 Silicon oxide, TiO 2 for titanium dioxide).

[0023] Add 1.0g of F127 to 38g of water to dissolve, then add 1.6ml of concentrated hydrochloric acid, add 1.15ml of ethyl orthosilicate after complete dissolution, add 4.2g of n-propyl titanate after reacting at 45°C for 6 hours, and continue to react for 24 hours to obtain a gel Put the reaction mixture into a stainless steel reaction kettle, heat it at 180°C for 24 hours, take out the reaction kettle, cool it, filter it with suction, wash it, and dry it to get the initial product, which has a high degree of crystallinity. The primary product is calcined under air conditions at 600°C to obtain a regular mesoporous silica-titania nanocomposite material with open pores and a specific surface area of ​​100m 2 / g, pore volume 0.15cm 3 / g, with a pore size of 15 nm.

Embodiment 2

[0024] Example 2: Using P123 as a template to synthesize OM-SiO at 180°C 2 -TiO 2 nanocomposites.

[0025] Add 1.2g of P123 to 38g of water to dissolve, then add 1.6ml of concentrated hydrochloric acid, add 1.15ml of ethyl orthosilicate after complete dissolution, add 4.2g of n-propyl titanate after reacting at 45°C for 6 hours, and continue to react for 24 hours to obtain a gel Put the reaction mixture into a stainless steel reaction kettle, heat it at 180°C for 24 hours, take out the reaction kettle, cool it, filter it with suction, wash it, and dry it to get the initial product, which has a high degree of crystallinity. The primary product is calcined under the air condition of 600°C to obtain a regular mesoporous silica-titania nanocomposite material with open channels.

Embodiment 3

[0026] Example 3: Using F127 as a template to synthesize OM-SiO at 220°C 2 -TiO 2 nanocomposites.

[0027]Add 1.0g of F127 to 38g of water to dissolve, then add 1.6ml of concentrated hydrochloric acid, add 1.15ml of ethyl orthosilicate after complete dissolution, add 4.2g of n-propyl titanate after reacting at 45°C for 6 hours, and continue to react for 24 hours to obtain a gel Put the reaction mixture into a stainless steel reaction kettle, heat it at 220°C for 24 hours, take out the reaction kettle, cool it, filter it with suction, wash it, and dry it to get the initial product, which has a high degree of crystallinity. The primary product is calcined under the air condition of 800°C to obtain a regular mesoporous silica-titania nanocomposite material with open pores.

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Abstract

The invention provides a high-crystallinity titanium dioxide-silica nano composite material with a regular mesoporous structure as well as a preparation method and application thereof. The preparation method comprises the following steps: with a nonionic surfactant F127 or P123 as a template agent, ethyl orthosilicate as a silicon source and titanium propoxide as a titanium source, performing self-assembling of the template agent and an inorganic substance, performing high-temperature hydrothermal treatment to obtain an initial product, and performing high-temperature roasting to obtain the titanium dioxide-silica nano composite material which is open in pore path, high in crystallinity and regular in mesoporous structure. The material has high crystallinity (as being in a typical anatase crystal form), has a regular mesoporous structure and large specific surface area and pore volume. The composite material has excellent photocatalytic performance under ultraviolet light conditions, can be used for rapidly degrading organic pollutants such as rhodamine B in water, and is high in stability and regenerability. The material has great research significance for developing novel and high-efficiency photocatalytic materials in industry.

Description

technical field [0001] The invention belongs to the technical fields of physical chemistry and material science, and in particular relates to a titanium dioxide-silicon dioxide nanocomposite with high crystallinity and regular mesoporous structure, a preparation method and application thereof. Background technique [0002] Since M41S was successfully prepared by Mobil scientists, regular mesoporous materials have received more and more attention in the field of material science research. Mesoporous materials are characterized by their large specific surface area, regular pore structure, uniform and adjustable pore size And the characteristics of rich skeleton composition make it widely studied in the fields of catalyst and catalyst support, adsorption, separation, drug sustained release and so on. However, the regular mesoporous materials with silica framework are the most reported so far, and the framework structure often exhibits an amorphous structure, which makes the mat...

Claims

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Application Information

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IPC IPC(8): B01J21/08C02F1/32C02F103/30
Inventor 刘福建孔维萍刘华王换换
Owner SHAOXING UNIVERSITY
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