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Photocatalytic element for purification and disinfection of air and water and method for the production thereof

A photocatalytic and component technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of short service life of photocatalytic components, lack of pH value, and unacceptable control.

Active Publication Date: 2015-11-18
克拉斯内波列有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During operation of the photocatalytic element with water vapor, part of the titanium dioxide powder is removed from the surface of the support, resulting in reduced activity and a shorter service life of the photocatalytic element;
[0021] - The lack of control over the pH of the aqueous suspension during the application of titanium dioxide onto the support does not allow the sustainable production of photocatalytic elements with maximum activity

Method used

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  • Photocatalytic element for purification and disinfection of air and water and method for the production thereof
  • Photocatalytic element for purification and disinfection of air and water and method for the production thereof
  • Photocatalytic element for purification and disinfection of air and water and method for the production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0042] Glass beads (0.8 mm to 1 mm portion) were poured to fill a cylindrical detachable stainless steel housing having an outer diameter of 86 mm, a width of 6 mm and a height of 420 mm. The shell was placed in an oven where sintering of the glass beads was carried out at a temperature of 15° C. above the glass softening point (about 690° C.) for 1 hour and 20 minutes. After cooling to room temperature, the housing was disassembled and the resulting support in the form of a porous glass tube was removed.

[0043] The support surface was then modified by first immersing in concentrated hydrofluoric acid for 1 min, then rinsing with water, then treating with concentrated sulfuric acid for 3 min, rinsing with water, and drying in an oven at 100°C until completely dehydrated.

[0044] The aqueous suspension is made of distilled water and anatase titanium dioxide powder with a specific surface area of ​​350 м 2 / g and the weight percent content of titanium dioxide is 10%. Dilute...

Embodiment approach 2

[0054] Glass beads (0.8 mm to 1 mm fraction) were poured to fill a flat tube of length 60 mm, width 5 mm and height 400 mm in a detachable stainless steel housing. Further sintering, carrier surface modification and catalyst coating operations are performed in the same manner as in Embodiment Mode 1.

[0055] The completed photocatalytic element contains:

[0056] - a porous support in the form of a parallelepiped with dimensions 400 mm 60 mm 5 mm, comprising sintered glass beads with a modified surface;

[0057] - Anatase titanium dioxide powder with a specific surface area of ​​350m 2 / g, the dosage is 2g / component.

[0058] A reference test sample was generated in the same way, except that titanium dioxide powder was coated onto the support from a pH=4.5 suspension.

[0059] Table 2

[0060]

[0061] The samples prepared according to this embodiment (main sample No. 3, reference sample No. 4) were tested under the reaction of photocatalytic oxidation of acetone vapor...

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Abstract

The invention relates to the field of purification and disinfection of air and water. A photocatalytic ele -ment consists of sintered glass beads with a pore volume fraction from 20% to 40% and a pore size from 0.1 to 0.5 mm, the surface of which is coated with a titanium dioxide powder, having a specific surface area of 150-400 m 2 / g, at the rate of 0.5-2%o relative to the total mass of the photocatalytic element. Furthermore, the surface of the glass beads has a relief shape with a relief depression of 0.5-10 urn. The method for producing the photocatalytic element comprises sintering the glass beads at a temperature that is 5-20°C higher than the glass softening temperature, modifying the bead surface with chemical etching agents, and coating the bead surface with the titanium dioxide powder from a water suspension at a pH of 2.9±0.1. The invention provides for the production of a photocatalytic element that is characterised by a strong adhesion and retention of the titanium dioxide powder on the surface of the carrier in the flow of a medium which is subjected to purification, and that has a high photocatalytic activity

Description

technical field [0001] The present invention relates to the field of air and water purification and disinfection, and in particular to the design and production method of photocatalytic elements that can be used as the main functional unit in molecular and integrated treatment devices utilizing photocatalysis. Background technique [0002] The photoactivated catalytic oxidative degradation of organic pollutants by TiO2 under the action of ultraviolet light is an advanced method for air and water purification and disinfection. This method is efficient, cost-effective, environmentally friendly and can eliminate almost any organic pollutants by mineralizing them into water and carbon dioxide. The main functional unit of the photocatalytic treatment devices ensuring their efficiency and durability is the photocatalytic element in the form of a structure combining nanocrystalline catalysts and defined shape supports installed in the UV radiation footprint. [0003] Photocatalyti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J35/10B01D53/86A61L2/10A61L9/20
CPCB01D53/885A61L2/10A61L9/20A61L9/205B01D53/86B01D53/8668B01D2255/20707B01D2255/802B01D2255/9202B01D2255/9205B01D2255/9207B01D2257/704B01D2257/90B01D2257/91B01D2258/06B01D2259/4508B01D2259/4533B01D2259/804B01J21/06B01J21/063B01J35/004B01J35/10B01J35/1019B01J35/1076B01J37/0217B01J37/06B01J37/08C02F1/725C02F2303/04C02F2305/10B01J35/39B01J35/60B01J35/657B01J35/615B01J37/0207B01J35/51B01J35/56
Inventor 伊戈尔·罗维奇·巴利克钦维克托·伊万诺维奇·贝莱斯特恩科伊戈尔·安纳多列维奇·多玛什涅夫叶夫根尼·尼古拉耶维奇·卡巴奇尼科夫叶夫根尼·尼古拉耶维奇·库尔金弗拉基米尔·尼古拉耶维奇·托洛伊茨基
Owner 克拉斯内波列有限责任公司
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