A kind of photocatalytic unit and photocatalytic method thereof

A photocatalytic unit and photocatalyst technology, applied in the field of photocatalysis, can solve the problems of affecting catalytic activity and stability, affecting catalyst activity and stability, easy loss of titanium dioxide, etc., to achieve improved activity and stability, good gas purification effect, The effect that is not easy to lose

Active Publication Date: 2022-07-26
中科粤能净(山东)新材料有限公司
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  • 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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  • A kind of photocatalytic unit and photocatalytic method thereof
  • A kind of photocatalytic unit and photocatalytic method thereof
  • A kind of photocatalytic unit and photocatalytic method thereof

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preparation example Construction

[0053] (2) Preparation method of photocatalyst

[0054] The foamed alumina-based carrier supports TiO in the present invention 2 The preparation method of photocatalyst includes:

[0055] (1) Preparation of titanium sol;

[0056] (2) The organic foam is immersed in the alumina-based slurry for hanging slurry, the excess slurry is removed, and after drying,

[0057] (3) Repeat step (2) for 0 to 5 times, preferably 1 to 4 times,

[0058] (4) spraying the mixed slurry of titanium oxide and aluminum oxide on the material obtained in step (3), and then drying and roasting to obtain a foamed aluminum oxide-based carrier;

[0059] (5) immersing the foamed alumina-based carrier obtained in step (4) into the titanium sol obtained in step (1) for hanging slurry, removing excess slurry, and drying,

[0060] (6) Repeat the dipping process 0 to 5 times, preferably 1 to 4 times;

[0061] (7) heat-treating the material obtained in step (6) to obtain foamed alumina-based carrier-supporte...

Embodiment 1

[0104] The 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 alumina-based slurry;

[0105] Mix nano-titanium oxide (particle size below 100nm, the same below) with polyethylene glycol (molecular weight is 600), and then mix with pseudo-boehmite, nitric acid and water, nano-titanium oxide, pseudo-boehmite (with Alumina), nitric acid, and water are mixed in a weight ratio of 15:3:2:15, and the amount of polyethylene glycol added is 3% by weight of the mixed slurry of titanium oxide and aluminum oxide to obtain a mixture of titanium oxide and aluminum oxide. slurry;

[0106]The polyurethane foam of square plate body was used for pretreatment, and the pretreated polyurethane foam was immersed in alumina-based slurry for vacuum dipping and slurrying, and the excess slurry was removed, dried at 75 °C for 6 hours, and the process was repeated twice; then spray dipping The mixed slur...

Embodiment 2

[0112] The 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;

[0113] After mixing nano-titanium oxide with polyethylene glycol (molecular weight is 600), it is then mixed with pseudo-boehmite, nitric acid, and water. Nano-titanium oxide, pseudo-boehmite (calculated as alumina), nitric acid, and water are The weight ratio is 15:3.5:2:18, and the amount of polyethylene glycol added is 2.5% of the weight of the mixed slurry of titanium oxide and aluminum oxide to obtain a mixed slurry of titanium oxide and aluminum oxide;

[0114] The polyurethane foam of square plate body was used for pretreatment, and the pretreated polyurethane foam was immersed in alumina-based slurry for vacuum dipping and slurrying, and the excess slurry was removed, dried at 75 °C for 6 hours, and the process was repeated twice; then spray dipping The mixed slurry of titanium oxide...

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Abstract

The invention discloses a photocatalytic unit and a photocatalytic method thereof. The photocatalytic unit includes a photocatalyst and an ultraviolet light source device. The photocatalyst adopts TiO supported by foam alumina-based carrier 2 In the photocatalyst, the foamed alumina-based carrier has an open-cell foam structure. When the above-mentioned photocatalytic unit is used for gas purification, it has good catalytic activity and stability.

Description

technical field [0001] The invention relates to a photocatalytic unit and a photocatalytic method thereof, belonging to the field of photocatalysis. 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, nitroaromatic hydrocarbons, phenols, organic pigments, pesticides, surfactants, etc.; , nitrite, thiocyanate, etc. into non-toxic or low-toxic compounds; can also be used in antibacterial, deodorant, air purification, self-cleaning materials and other fields. The semiconductor photocatalysts that have been studied so far mainly include metal oxides and sulfides, among which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01D53/86B01D53/58B01D53/72B01D53/52B01D53/50
CPCB01J21/063B01J35/004B01D53/007B01D53/8668B01D53/8634B01D53/8609B01D53/8612B01D2257/91
Inventor 赵杰
Owner 中科粤能净(山东)新材料有限公司
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