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A kind of foam ceramic carrier, titanium dioxide photocatalyst and preparation method thereof

A photocatalyst and foam ceramic technology, applied in the field of photocatalytic materials, can solve problems such as affecting catalytic activity and stability, affecting catalytic activity stability, easy loss of titanium dioxide, etc., and achieves good adsorption and desorption performance, high mechanical strength, and difficult drain effect

Active Publication Date: 2022-07-26
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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  • A kind of foam ceramic carrier, titanium dioxide photocatalyst and preparation method thereof
  • A kind of foam ceramic carrier, titanium dioxide photocatalyst and preparation method thereof
  • A kind of foam ceramic carrier, titanium dioxide photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] According to nano titanium dioxide powder (particle size is less than 100nm, the same below): alumina dry rubber powder (calculated as alumina): peptizing acid: kaolin: water in a weight ratio of 1.5: 10: 2.5: 0.4: 6.0 to prepare Complex oxide precursor slurry A1;

[0074] After mixing nano titanium dioxide powder with polyethylene glycol 600, and then mixing 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 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 composite oxide precursor slurry;

[0075] Take the foam ceramics as 15cm in length, 15cm in width, 1cm in thickness, 70% open porosity, 1mm-5mm in cell diameter, and 10ppi in pore density. The pore volume of the foam ceramic is 0.31 mL / g, the pore volume occupied by t...

Embodiment 2

[0082] According to the weight ratio of nano titanium dioxide powder: alumina dry rubber powder (calculated as alumina): peptizing acid: kaolin: water 2.0:10:2.0:0.5:6.0, prepare composite oxide precursor slurry B1;

[0083] After mixing nano titanium dioxide powder with polyethylene glycol 600, and then mixing 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 to prepare composite oxide precursor slurry B2, wherein the amount of polyethylene glycol added accounts for 2% of the weight of composite oxide precursor slurry;

[0084] Take a square foam ceramic, the length is 15cm, the width is 15cm, the thickness is 1cm, the porosity is 70%, the diameter of the cell is 1mm-5mm, and the pore density is 20ppi. The pore volume of the foam ceramic is 0.26 mL / g, the pore volume occupied by the pore diameter below 2...

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 in a weight ratio of 1.0:10:2.0:0.5:6.0.

[0091] After mixing nano titanium dioxide powder with polyethylene glycol 600, and then mixing 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 3.0:10:3.0:0.3:8.0 to prepare composite oxide precursor slurry C2, wherein the amount of polyethylene glycol added accounts for 2.5% of the weight of composite oxide precursor slurry;

[0092] Take the foamed ceramics as in Example 1. The foamed ceramics were first vacuum-impregnated with the composite oxide precursor slurry C1 twice, and then dried at 70°C for 6 hours after immersion, and then vacuum-impregnated with the composite oxide precursor slurry C2, and...

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Abstract

The invention discloses a foamed ceramic carrier, and the foamed ceramic carrier supports TiO 2 Photocatalyst and preparation method thereof. The foamed ceramic carrier includes foamed ceramics and composite oxides. The foamed ceramics has an open-cell foam structure. The pores of the foamed ceramics contain three-dimensional through-micron-scale pores, and the surface of the pores and the pores are distributed with composite oxides. The preparation method of the foamed ceramic carrier comprises: impregnating the foamed ceramic with the composite oxide precursor slurry to prepare the foamed ceramic carrier. The supported TiO prepared by the foamed ceramic carrier 2 The photocatalyst has high photocatalytic activity, and the titanium dioxide is not easily lost, and the activity stability is good, especially suitable for photocatalytic purification of gas or liquid.

Description

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

Claims

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Application Information

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