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Preparing method of hollow-structure titanium oxide/silicon oxide composite photocatalytic material

A composite photocatalysis and silicon oxide technology, which is applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. Hollow structure and other problems, to achieve the effect of simple method flow, wide application prospect and strong operability

Inactive Publication Date: 2018-04-10
NATURE ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent application 201610056113.2 discloses a method for preparing nano-mesoporous SiO with high specific surface area 2 -TiO 2 The preparation method of composite self-cleaning material, in this method, organic silicon is added in titanium-peroxide-ammonia complex solution to prepare SiO 2 -TiO 2 Composite materials, but the prepared material has a small specific surface area and is not a hollow structure. Surfactants and other components are also used in it. Since the surfactant is difficult to remove, it affects the dimensional stability and photocatalytic effect of the product. At the same time, the process is also very difficult. complex and expensive

Method used

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  • Preparing method of hollow-structure titanium oxide/silicon oxide composite photocatalytic material
  • Preparing method of hollow-structure titanium oxide/silicon oxide composite photocatalytic material
  • Preparing method of hollow-structure titanium oxide/silicon oxide composite photocatalytic material

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preparation example Construction

[0033] In the preparation method according to the present invention, preferably the volume ratio of the ethanol phase to the water phase in step 1) is 0.5:1 to 0.8:1, more preferably 0.5:1 to 0.65:1. When the volume ratio of the ethanol phase to the water phase should be controlled between 0.5:1 and 0.8:1, the water-in-alcohol structure can be formed, and the titanium-peroxide-ammonia complex complex in the water phase is cross-linked to form a microsphere structure; low At 0.5, the water-in-alcohol structure cannot be formed, and the titanium-peroxide-ammonia composite complex becomes a blocky small particle agglomerate; more than 0.8, the titanium-peroxide-ammonia composite complex dissolves to form a homogeneous system.

[0034]Preferably, the mass ratio of the organosilane compound to the titanium-peroxide-ammonia composite complex microspheres in step 3) is 1:0.5 to 1:6, more preferably 1:1 to 1:3, most preferably It is 1:2. When the mass ratio of organosilane compound t...

Embodiment 1

[0038] First dissolve 80g of titanyl sulfate with 300ml of deionized water to obtain a titanyl sulfate aqueous solution; titrate the titanyl sulfate solution to a pH of 8.5 with a mass concentration of 36% ammonia water, centrifuge the precipitate, and then wash 3 times with deionized water to obtain Orthotitanic acid; be that 25% hydrogen peroxide aqueous solution dissolves washed 7g orthotitanic acid to obtain titanium peroxide aqueous solution with 10ml mass percent concentration, be that the pH of 4% ammoniacal liquor mediation is adjusted the titanium peroxide aqueous solution 11; add 25ml of absolute ethanol to the above solution system to form an emulsion structure.

[0039] The inlet temperature of the spray drying equipment is 20°C, the outlet temperature is 30°C, the feed rate is 50mL / h, and the compressed air flow rate is 500L / h to spray the above titanium hydrogen peroxide complex solution system, and then vacuum the solution Filter and dry to obtain titanium hydro...

Embodiment 2

[0043] Except that the mass ratio of the organosilane compound to the titanium-peroxide-ammonia composite complex microspheres is 1:6, the hollow structure SiO is obtained in the same manner as in Example 1. 2 -TiO 2 Composite photocatalytic material with a specific surface area of ​​852.31m 2 / g.

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Abstract

The invention discloses a preparing method of a hollow-structure nanometer titanium dioxide self-cleaning composite photocatalytic material high in specific surface area. The method includes the stepsof firstly, synthesizing a titanium and peroxide ammonia compound emulsion; secondly, drying titanium and peroxide ammonia compound microspheres; thirdly, conducting silicon oxide wrapping; fourthly,conducting sintering. Through the catalytic hydrolysis effect of silane, a silicon oxide shell layer is synthesized, and the hollow-structure SiO2 / TiO2 composite is obtained through the sudden drop of the size of the titanium and peroxide ammonia compound in the crystallizing process. The method is simple in process, high in operability, low in cost and suitable for batched preparation and has industrial production probability and wide application prospects.

Description

technical field [0001] The invention belongs to the field of inorganic metal oxides, in particular to a preparation method of a nano-titanium dioxide self-cleaning composite photocatalytic material with a superhydrophilic self-cleaning high specific surface area hollow structure. Background technique [0002] Super-hydrophilic self-cleaning technology can form a stable coating on the surface of the substrate, so that the substrate can be self-cleaned under the action of sunlight and rain, and has broad application prospects in construction, solar panel and other industries. [0003] TiO 2 As a kind of transparent semiconductor material with wide optical bandgap, thin film has attracted widespread attention due to its unique physical, chemical and optoelectronic properties. Especially superhydrophilic (water contact angle less than 5°) TiO with high light transmittance 2 Due to its self-cleaning properties, the film can be applied to the surface of solar cells and LEDs, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/08B01J35/10
CPCB01J21/08B01J23/002B01J35/39B01J35/617
Inventor 冯泽云
Owner NATURE ENVIRONMENTAL PROTECTION TECH
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