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Preparation method of load type photocatalytic purification net block

A technology for photocatalysis and net purification, applied in the field of photocatalysis, can solve the problems of reducing adsorption capacity, affecting catalytic efficiency, and poor adhesion of carrier meshes, and achieving the effect of efficient sterilization and improving living comfort.

Inactive Publication Date: 2004-07-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses polyurethane adhesive as the base layer to combine activated carbon and TiO 2 Bonded on the surface of the carrier, due to the high viscosity of polyurethane, when the composite photocatalyst is coated on the surface, it is easy to block the pores of the activated carbon and reduce the adsorption capacity. On the other hand, the catalyst blocks the carrier mesh due to the presence of more glue Or the use of less glue and poor bonding will make the purification net poorly ventilated, unsightly in appearance and even affect the catalytic efficiency
In addition, from the data described in the patent, all degradation models use extremely high initial concentrations of pollutants (above 1000ppm), which is meaningless for real indoor air purification, and no low initial pollutant concentrations are found in the article Data for photocatalytic degradation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The coal-based high-adsorption activated carbon powder, composite photocatalyst, and magnesium tourmaline powder are compounded and crushed by airflow to make a multifunctional and efficient photocatalyst A. The content of activated carbon powder is 30%, and the content of composite photocatalyst is 60%. Magnesium Electric Stone powder content is 10%. Mix A, small particle size styrene-acrylic emulsion, and deionized water in a mass ratio of 1:2.5:1.25 and prepare stable suspension slurry B in a high-speed disperser or ultrasonic pulverizer. Immerse the aluminum-based honeycomb network (washed with dilute acid in advance) with a length of 360 mm, a width of 230 mm, and a thickness of 6 mm in the slurry B. It is advisable to completely immerse the network blocks in the slurry. After dipping for 2 minutes, take it out, remove the excess slurry hanging in the mesh, dry it in a drying oven at 100 degrees Celsius, and then apply a layer in the same way. Take two such photoc...

Embodiment 2

[0021] According to the method described in Example 1, the multifunctional high-efficiency photocatalyst and photocatalytic purification network block are prepared. The first difference is that the highly adsorbable activated carbon is coconut shell carbon, and the second is that the active carbon powder content is 10%, and the composite photocatalyst content is 50%. , Magnesite powder content is 40%. Place the purification net block on the purification device described in Example 1 and place the device in the working cabin, inject organic pollutants formaldehyde 7.8ppm, benzene 23.9ppm, ammonia 5.5ppm into the working cabin in stages, and the total number of bacteria > 100 pcs / dish. Turn on the ultraviolet light to test the photocatalytic effect. After 3 hours, the degradation rate of formaldehyde is 90%, the degradation rate of benzene is 66%, the degradation rate of ammonia is 92% after 1 hour, the removal rate of bacteria is 89%, and the concentration of negative ions is 1...

Embodiment 3

[0023] According to the method described in Example 1, a multifunctional high-efficiency photocatalyst and a photocatalytic purification network block are prepared. The first difference is that the water-based adhesive is a pure acrylic emulsion, and the second is that the content of activated carbon powder is 40%, and the content of the composite photocatalyst is 20%. , the content of magnesium tourmaline powder is 40%, and the third is that the carrier used is corrugated paper, with the same size and thickness as in Example 1. Place the purification net block on the purification device described in Example 1 and place the device in the working cabin, inject organic pollutants formaldehyde 5.6ppm, benzene 20.3ppm, ammonia 5.8ppm into the working cabin in stages, and the total number of bacteria > 100 pcs / dish. Turn on the ultraviolet lamp to test the photocatalytic effect. After 3 hours, the degradation rate of formaldehyde is 84%, the degradation rate of benzene is 55%, the ...

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Abstract

The preparation method of load-type photocatalytic cleaning net block includes the following steps: adopting active carbon as adsorbing agent, high-effective composite catalyst as photocatalyst and toumalinite as auxiliary material, mechanically mixing them to prepare multifunctional high-effective photocatalyst, then adopting water soluble latex as adhesive, mixing them, dispersing to obtain the stable suspension slurry, finally, adopting spray-coating or immersion-coating process to make the catalyst coating layer by uniformly adhered on the catalyst load carrier so as to obtain the load type photocatalytic cleaning net block which can degrade the organic pollutants of formaldehyde, benzene and ammonia.

Description

technical field [0001] The invention relates to a preparation method of a photocatalytic purification net block, in particular to a preparation method of a loaded photocatalytic purification net block. It belongs to the field of photocatalysis. Background technique [0002] In recent years, environmental pollution has received worldwide attention. At present, the materials used in air purification are mainly activated carbon or non-woven fabrics. Because of their high adsorption capacity, fast purification speed and significant short-term effect, they are widely used in various air purification equipment. However, this type of material has a limit of adsorption saturation, and it must be taken out of the equipment during regeneration, which is cumbersome to operate and easily causes secondary pollution. The material itself does not have the function of sterilizing or inhibiting bacteria. [0003] In the past ten years, the research on the use of semiconductor powder as pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01J21/06B01J23/00B01J37/02
Inventor 古宏晨徐宏吴亚妮程存康
Owner SHANGHAI JIAO TONG UNIV
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