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Photocatalysis unit and photocatalysis method thereof

A photocatalytic unit and photocatalyst technology, applied in the field of photocatalysis, can solve problems such as difficult recycling, difficult separation, easy loss of titanium dioxide, etc., and achieve the effect of enhanced strength and large external specific surface area

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

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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
The technical problems of this ceramic-supported photocatalyst 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 the carrier, 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 the catalytic activity, and even high-temperature calcination still exists. Titanium dioxide is easy to lose The problem, which affects the activity and stability of the catalyst; third, when the ceramic carrier supports titanium dioxide, it is also prone to the problem of uneven distribution, which further affects its catalytic activity and stability.

Method used

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  • Photocatalysis unit and photocatalysis method thereof
  • Photocatalysis unit and photocatalysis method thereof
  • Photocatalysis unit and photocatalysis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] According to nano-titanium dioxide powder (particle size below 100nm, the same below): alumina dry rubber powder (calculated as alumina): peptizing acid: kaolin: water is mixed in a weight ratio of 1.5:10:2.5:0.4:6.0 to prepare Composite oxide precursor slurry A1;

[0073] Mix the nano-titanium dioxide powder with polyethylene glycol 600, then mix it with alumina dry rubber powder, peptizing acid, and water, according to nano-titanium dioxide powder: alumina dry rubber powder (calculated as alumina): peptizing acid: kaolin : water is mixed at a weight ratio of 3:10:2.5:0.3:6.5 to prepare composite oxide precursor slurry A2, wherein the amount of polyethylene glycol added accounts for 2% of the weight of the composite oxide precursor slurry;

[0074] The foamed ceramics is 15cm long, 15cm wide, 1cm thick, with a porosity of 70%, a cell diameter of 1mm-5mm, and a pore density of 10ppi. The pore volume of the foamed ceramics is 0.31mL / g, the pore volume occupied by the po...

Embodiment 2

[0081] According to nano-titanium dioxide powder: alumina dry rubber powder (calculated as alumina): peptizing acid: kaolin: water is mixed in a weight ratio of 2.0:10:2.0:0.5:6.0 to prepare composite oxide precursor slurry B1;

[0082] Mix the nano-titanium dioxide powder with polyethylene glycol 600, then mix it with alumina dry rubber powder, peptizing acid, and water, according to nano-titanium dioxide powder: alumina dry rubber powder (calculated as alumina): peptizing acid: kaolin : The weight ratio of water is 2.5:10:2.5:0.3:6.5 and mixed to prepare the composite oxide precursor slurry B2, wherein the addition of polyethylene glycol accounts for 2% of the weight of the composite oxide precursor slurry;

[0083] Take a square ceramic foam with a length of 15 cm, a width of 15 cm, a thickness of 1 cm, a porosity of 70%, a cell diameter of 1 mm to 5 mm, and a pore density of 20 ppi. The pore volume of the foamed ceramics is 0.26mL / g, the pore volume occupied by the pore di...

Embodiment 3

[0089] The composite oxide precursor slurry C1 was prepared by mixing nano titanium dioxide powder: alumina dry rubber powder (calculated as alumina): peptizing acid: kaolin: water at a weight ratio of 1.0:10:2.0:0.5:6.0.

[0090] Mix the nano-titanium dioxide powder with polyethylene glycol 600, then mix it with alumina dry rubber powder, peptizing acid, and water, according to nano-titanium dioxide powder: alumina dry rubber powder (calculated as alumina): peptizing acid: kaolin : water is mixed at a weight ratio of 3.0:10:3.0:0.3:8.0 to prepare composite oxide precursor slurry C2, wherein the addition of polyethylene glycol accounts for 2.5% of the weight of the composite oxide precursor slurry;

[0091] Get ceramic foam with embodiment 1. Vacuum impregnate the foamed ceramics with composite oxide precursor slurry C1 twice, then dry at 70°C for 6 hours after impregnation, then vacuum impregnate composite oxide precursor slurry C2, and then dry at 70°C for 6 hours. Two-stag...

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Abstract

The invention discloses a photocatalysis unit and a photocatalysis method thereof. The photocatalysis unit comprises a photocatalyst and a light source device, wherein the photocatalyst comprises a foamed ceramic carrier and TiO2 crystal grains distributed on the surface of the foamed ceramic carrier, the foamed ceramic carrier comprises a foamed ceramic and a composite oxide, the foamed ceramic has an open-cell foam structure, three-dimensional through micron-scale pore channels are formed in the pore edges of the foamed ceramic, and the composite oxide is distributed on the surfaces of the pore edges and in the pore channels. The photocatalytic unit has good catalytic activity and good stability when being used for purifying gas.

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, 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 fields. The semiconductor photocatalysts that have been studied so far mainly include metal oxides and sulfides, among which titanium ...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01D53/86B01D53/58B01D53/50B01D53/52B01D53/72
CPCB01J21/063B01D53/007B01D53/8668B01D53/8634B01D53/8609B01D53/8612B01D2257/91B01J35/39
Inventor 赵杰
Owner 中科粤能净(山东)新材料有限公司
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