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TiO2 photocatalyst and preparation method thereof

A photocatalyst and catalyst technology, applied in the field of photocatalytic materials, can solve the problems of affecting catalytic activity and stability, affecting catalyst activity and stability, easy loss of titanium dioxide, etc., to achieve good adsorption and desorption performance, good photocatalytic degradation performance, The effect of high photocatalytic reactivity and stability

Active Publication Date: 2020-03-10
中科粤能净(山东)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Titanium dioxide photocatalysts are usually used in powder form, but this will form a suspension system in the fluid, which will cause technical problems such as separation difficulties and difficult recovery, thus limiting the practical application
[0004] At present, the technical problems of supported photocatalysts are: first, when non-catalytic materials such as binders are used, the amount of titanium dioxide on the surface will be affected during the loading and sintering process, thereby affecting the catalytic activity; When titanium dioxide is loaded on a carrier such as titanium dioxide, high-temperature calcination is usually used to increase the firmness of titanium dioxide loading, but titanium dioxide is easily sintered, and a non-photocatalytically active crystal phase is formed, thereby affecting catalytic activity, and even high-temperature calcination still exists. The problem of loss, which affects the activity and stability of the catalyst; third, when ceramics and other carriers support titanium dioxide, it is also prone to uneven distribution, which further affects its catalytic activity and stability.

Method used

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  • TiO2 photocatalyst and preparation method thereof
  • TiO2 photocatalyst and preparation method thereof
  • TiO2 photocatalyst and preparation method thereof

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preparation example Construction

[0068] (2) TiO 2 Preparation method of photocatalyst

[0069] The second aspect of the present invention provides a foamed alumina-based carrier loaded with TiO 2 The preparation method of photocatalyst comprises:

[0070] (1) Preparation of titanium sol;

[0071] (2) Immerse the organic foam in the alumina-based slurry to hang the slurry, remove the excess slurry, and dry it.

[0072] (3) repeat step (2) process 0~5 times, preferably 1~4 times,

[0073] (4) Spray and immerse the mixed slurry of titanium oxide and aluminum oxide on the material obtained in step (3), and then dry and roast to obtain a foamed aluminum oxide-based carrier;

[0074](5) Immerse the foamed alumina-based carrier obtained in step (4) into the titanium sol obtained in step (1) for slurrying, remove excess slurry, and dry,

[0075] (6) Repeat the dipping process 0 to 5 times, preferably 1 to 4 times;

[0076] (7) The material obtained in step (6) is subjected to heat treatment to obtain foamed alu...

Embodiment 1

[0119] γ-Al 2 o 3 Powder, urea, aluminum hydroxide sol (calculated as alumina), kaolin, and water are mixed in a weight ratio of 10:0.3:2.0:0.3:6 to obtain an alumina-based slurry;

[0120] Nano-titanium oxide (below 100nm in particle size, the same below) is mixed with polyethylene glycol (molecular weight is 600), and then mixed with pseudo-boehmite, nitric acid, water, nano-titanium oxide, pseudo-boehmite (with Aluminum oxide), nitric acid, and water are mixed in a weight ratio of 15:3:2:15, and the amount of polyethylene glycol is added according to 3% of the weight of the mixed slurry of titanium oxide and aluminum oxide to obtain a mixture of titanium oxide and aluminum oxide. slurry;

[0121] Use polyurethane foam with a square plate for pretreatment, immerse the pretreated polyurethane foam in alumina-based slurry for vacuum dipping, remove excess slurry, dry at 75°C for 6 hours, repeat this process twice; then spray dip The mixed slurry of titanium oxide and alumin...

Embodiment 2

[0127] γ-Al 2 o 3 Powder, urea, aluminum hydroxide sol (calculated as alumina), kaolin, and water are mixed in a weight ratio of 10:0.4:2.0:0.4:7 to obtain an alumina-based slurry;

[0128] Nano-titanium oxide is mixed with polyethylene glycol (molecular weight: 600), and then mixed with pseudo-boehmite, nitric acid, and water, and nano-titanium oxide, pseudo-boehmite (calculated as alumina), nitric acid, and water are mixed The weight ratio is 15:3.5:2:18, the amount of polyethylene glycol added is 2.5% of the weight of the mixed slurry of titanium oxide and aluminum oxide, and the mixed slurry of titanium oxide and aluminum oxide is obtained;

[0129] Use polyurethane foam with a square plate for pretreatment, immerse the pretreated polyurethane foam in alumina-based slurry for vacuum dipping, remove excess slurry, dry at 75°C for 6 hours, repeat this process twice; then spray dip The mixed slurry of titanium oxide and aluminum oxide is subjected to unsaturated spray dippi...

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Abstract

The invention discloses a TiO2 photocatalyst and a preparation method thereof. The catalyst is TiO2 photocatalyst supported by a foam alumina-based supporter having a porous foam structure. The preparation method includes: preparing the alumina-based supporter, impregnating the supporter in titanium sol, and performing thermal treatment to prepare the photocatalyst. The photocatalyst has high photocatalytic activity and is very suitable for a catalytic reaction process under the effect of ultraviolet light.

Description

technical field [0001] The invention relates to a titanium dioxide photocatalyst and a preparation method thereof, in particular to a foam alumina-based carrier loaded titanium dioxide photocatalyst and a preparation method thereof, belonging to the field of photocatalytic materials. Background technique [0002] Semiconductor photocatalytic oxidation, as a new technology that can decompose organic matter into carbon dioxide and water under normal temperature and pressure without causing secondary pollution, has attracted great attention from researchers all over the world. Studies have found that the use of semiconductor photocatalysis can effectively degrade various organic pollutants in water and air, such as halogenated hydrocarbons, nitroaromatics, phenols, organic pigments, pesticides, surfactants, etc.; , nitrite, thiocyanate, etc. into non-toxic or low-toxic compounds; can also be used in antibacterial, deodorizing, air purification, self-cleaning materials and other...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01D53/52B01D53/50B01D53/58B01D53/72
CPCB01J21/063B01D53/8668B01D53/8634B01D53/8609B01D53/8612B01D53/007B01D2257/91B01J35/39
Inventor 赵杰
Owner 中科粤能净(山东)新材料有限公司
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