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Method for purifying air by combining electrochemical degradation with photocatalysis technique

A technology of air purification and photocatalysis, applied in the field of air purification

Inactive Publication Date: 2015-02-18
DIMEI INT GRP ENVIRONMENTAL PROTECTION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Photocatalytic technology also has its limitations: the main problem of photocatalytic application in the actual degradation of organic matter is the immobilization of photocatalysts and the characteristics of surface reactions, which determine that photocatalytic technology is more suitable for the degradation of low-concentration organic pollutants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Experimental selection: the filter device adopts two-layer filtration, the first-stage filtration adopts 20ppi fiber filter material, and the second-stage filtration adopts 5ppi fiber filter material; the flow type electrolyzer adopts Ti / PbO 2 The coated plate is the anode, the stainless steel plate is the cathode, the distance between the electrodes is 4mm, the electrode voltage is 10V, and the current density is 50mA / cm 2 , the electrolyte uses 0.1mol / L sodium sulfate; the photocatalytic reaction pool uses an ultraviolet lamp with a power of 18w and a wavelength of 253nm as the light source; the photocatalyst uses zeolite-titanium dioxide photocatalyst; The standard gas, the dilution gas uses standard purified air) mixed with 20mg of dust particles.

[0033] Reaction performance: The particle filtration rate of the filter device is 95%, and the synergistic effect of the electrolytic cell and photocatalysis improves the efficiency of photocatalytic oxidation of organic m...

Embodiment 2

[0035] Experimental selection: the filter device adopts three-layer filtration, the first-stage filtration uses 30ppi fiber filter material, the second-stage filter uses 20ppi fiber filter material, and the third-stage filter uses 5ppi fiber filter material; the flow electrolyzer uses Ti / PbO 2 The coated plate is the anode, the stainless steel plate is the cathode, the distance between the electrodes is 1mm, the electrode voltage is 15V, and the current density is 15mA / cm 2 , the electrolyte uses 0.5mol / L potassium sulfate; the photocatalytic reaction pool uses a UV lamp with a power of 30w and a wavelength of 253nm as the light source, and the photocatalyst uses zeolite-titanium dioxide photocatalyst; the simulated waste gas uses formaldehyde gas (0.0500%±0.0002% The standard gas, the dilution gas uses standard purified air) mixed with 30mg of dust particles.

[0036] Reaction performance: The particle filtration rate of the filter device is 97%. The synergistic effect of the...

Embodiment 3

[0038] Experimental selection: the filter device adopts three-layer filtration, the first-stage filtration uses 30ppi fiber filter material, the second-stage filter uses 10ppi fiber filter material, and the third-stage filter uses 5ppi fiber filter material; the flow electrolyzer uses Ti / PbO 2 The coated plate is the anode, the stainless steel plate is the cathode, the distance between the electrodes is 2mm, the electrode voltage is 11V, and the current density is 20mA / cm 2 , the electrolyte uses 0.3mol / L potassium nitrate; the photocatalytic reaction pool uses a UV lamp with a power of 20w and a wavelength of 253nm as the light source, and the photocatalyst uses zeolite-titanium dioxide photocatalyst; the simulated waste gas uses formaldehyde gas (0.0500%±0.0002%) The standard gas, the dilution gas uses standard purified air) mixed with 20mg of dust particles.

[0039] Reaction performance: The particle filtration rate of the filter device is 93%. The synergistic effect of th...

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Abstract

The invention discloses a method for purifying air by combining electrochemical degradation with a photocatalysis technique. A device for implementing the method mainly consists of a filtering device, a flow type electrolytic bath which is formed by using Ti / PbO2 as an anode and a stainless steel plate as a cathode, and a photocatalysis reactor which is based on a zeolite-titanium dioxide photocatalyst. The method comprises the following steps: air containing pollutants and dust particles is subjected to fiber filtration firstly, then is subjected to an electrocatalysis oxidation reaction at the anode of the flow type electrolytic bath, and enters the photocatalysis reactor for further degradation after electrolysis. Through the combination of three kinds of technologies, the filtration effect of air is improved, the problem of low speed of a photocatalysis reaction is solved, the method thoroughly solves the problem of poor efficiency of a single module, and the air purification effect is not less than 90%.

Description

technical field [0001] The invention belongs to the field of air purification, and in particular relates to an air purification method combined with electrochemical degradation and photocatalysis technology. Background technique [0002] With the improvement of people's material living standards, modern people spend about 80%-90% of their time indoors in a day, so the quality of the indoor environment directly affects our health. Unfortunately, air-conditioning systems and various decorative materials are widely and frequently used in buildings, making indoor air pollution worse. Indoor air pollution is becoming the third pollution period marked by "soot type" and "photochemical smog type". According to the survey of relevant international organizations, nearly 3 million people die directly or indirectly from decoration pollution every year in the world, and 30% of the world's newly built and rebuilt buildings have indoor air pollution gases harmful to health. At present,...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D46/30
Inventor 王强
Owner DIMEI INT GRP ENVIRONMENTAL PROTECTION SCI & TECH
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