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Foam ceramic supporter, TiO2 photocatalyst and preparation method thereof

A foamed ceramic and photocatalyst technology, applied in the field of photocatalytic materials, can solve the problems of affecting catalytic activity, affecting the stability of catalyst activity, easy loss of titanium dioxide, etc., and achieving stable catalyst performance, good application prospects, and good photocatalytic degradation performance. Effect

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
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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  • Foam ceramic supporter, TiO2 photocatalyst and preparation method thereof
  • Foam ceramic supporter, TiO2 photocatalyst and preparation method thereof
  • Foam ceramic supporter, TiO2 photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] 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;

[0074] 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;

[0075] 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

[0082] 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;

[0083] 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;

[0084] 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

[0090] 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.

[0091] 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;

[0092] 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 foam ceramic supporter, a TiO2 photocatalyst supported on the foam ceramic supporter and a preparation method thereof. The foam ceramic supporter includes foam ceramic and acomposite oxide, wherein the foam ceramic has a porous foam structure, the pore edges in the foam ceramic contain three-dimensional penetrating micro-scale pore channels, the composite oxides distributing in the surface of the pore edges and the interior of the pore channels. The preparation method of the foam ceramic supporter includes: impregnating the foam ceramic with a composite oxide precursor slurry to obtain the foam ceramic supporter. The TiO2 photocatalyst supported by the foam ceramic supporter is high in photo-catalytic activity, wherein the TiO2 is not liable to lose, so that thephotocatalyst has good activity stability and is especially suitable for photocatalytic purification of gas or liquid.

Description

technical field [0001] The invention relates to a foam ceramic carrier, a titanium dioxide photocatalyst and a preparation method thereof, in particular to a foam ceramic 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 m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01D53/86B01D53/72B01D53/58B01D53/50B01D53/52
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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