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Visible light photocatalysis air purification material and air purification method

An air purification material and air purification technology, applied in chemical instruments and methods, catalyst activation/preparation, separation methods, etc., can solve problems such as ineffective use of visible light, low photocatalytic oxidation efficiency, and limited photocatalytic technology, etc. To achieve the effect of small secondary pollution, improved adsorption and purification effects, and wide application prospects

Inactive Publication Date: 2009-04-08
DALIAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

However, from the perspective of indoor practical application, since titanium dioxide relies on ultraviolet light excitation, it cannot effectively use visible light, and the indoor concentration of toluene, formaldehyde and other polluting gases is usually low, and the efficiency of photocatalytic oxidation is not high. Catalytic technology is widely and practically used in the living environment
At present, there are no patents or reports on the use of metal mesh and chitosan-modified nylon materials to load copper-doped bismuth vanadate catalysts to remove major indoor pollutants such as toluene and formaldehyde, and to improve the utilization of indoor household products.

Method used

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  • Visible light photocatalysis air purification material and air purification method
  • Visible light photocatalysis air purification material and air purification method

Examples

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preparation example Construction

[0015] Preparation of copper oxide / bismuth vanadate composite photocatalyst. Dissolve bismuth nitrate and ammonium vanadate in 4mol / L nitric acid and sodium hydroxide solution at a molar ratio of 1:1, add surfactant P123, stir for half an hour respectively, then mix the above two solutions, and use 2mol / L hydrogen The sodium oxide solution was used to adjust the pH to neutral, and then stirred for half an hour. The precursor solution was poured into a 100mL reactor, and hydrothermally reacted at 200°C for two hours. The product was repeatedly washed with deionized water and absolute ethanol three times, and then dried at 100°C to obtain bismuth vanadate catalyst powder. The prepared bismuth vanadate powder and copper nitrate are weighed according to the weight ratio of copper and bismuth vanadate at 2.5% to 7.0%, mixed with deionized water, evaporated to dryness on a rotary evaporator to powder, and then heated at 300°C The copper oxide / copper vanadate composite nano photocat...

Embodiment 1

[0021] 1. Preparation of copper oxide / bismuth vanadate composite photocatalyst powder

[0022] Dissolve 2.45g bismuth vanadate and 0.58g ammonium vanadate in 10.0mL 4.0mol / L nitric acid solution and sodium hydroxide solution respectively, add 0.25g P 123 to the two solutions respectively, stir for half an hour each, and mix the two solutions The solutions were mixed, and the pH was adjusted to 7.0 using 2.0 mol / L sodium hydroxide solution, and then stirred for half an hour. Put the precursor liquid into a 100mL reaction kettle, and hydrothermally react in an oven at 200°C for two hours. After cooling down to room temperature, wash the product repeatedly with deionized water and absolute ethanol, and dry it at 100°C for four hours to obtain light yellow vanadic acid Bismuth powder. Weigh 0.8098g of bismuth vanadate and 0.1528g of copper nitrate, so that the weight ratio of copper to bismuth vanadate is 5.0%. Place it on a rotary evaporator and evaporate it to dryness to obtai...

Embodiment 2

[0028] 1. Preparation of copper oxide / bismuth vanadate composite photocatalyst powder

[0029] The preparation of bismuth vanadate powder is the same as in Example 1. Then weigh 0.8098g of bismuth vanadate and 0.0764g of copper nitrate, so that copper accounts for 2.5% of the bismuth vanadate. Place it on a rotary evaporator and evaporate it to dryness to obtain a powder, bake it in a muffle furnace at 300°C for four hours, and grind it evenly to obtain a copper-doped 2.5% bismuth vanadate composite photocatalyst powder.

[0030] 2. Preparation of chitosan-modified nylon-supported copper-doped bismuth vanadate photocatalytic material

[0031]The nylon membrane was first hydrolyzed in 1mol / L hydrochloric acid solution at 40°C for four hours, then immersed in 20mL formaldehyde solution, added 0.2mL phosphoric acid, reacted at 60°C for seven hours, and washed with hot water at 40°C-50°C for several times. Then the formaldehyde-activated nylon membrane was immersed in 10mL of 1....

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Abstract

The invention relates to a visible light photocatalysed material for air purification and a method for air purification, which belong to the technical field of air purification through photocatalysis. The method is characterized by comprising the following steps: firstly, preparing nanometer photocatalyst powders of copper oxide / bismuth vanadate; secondly, dispersing and loading the photocatalyst powders on a metal mesh and a nylon base material by using silicon or titanium sol; and thirdly, naturally drying the photocatalyst powders or baking the photocatalyst powders at a temperature of between room temperature and 100 DEG C, so as to form a material with excellent visible light catalytic activity to toluene, formaldehyde and other air pollutants. At the same time, the surface of chitosan is modified by the nylon base material to effectively enhance the formaldehyde pollutant adsorption effect of the surface of the material. The visible light photocatalysed material for air purification and the method for the air purification have the advantages that the prepared nanometer photocatalysed material of the copper oxide / bismuth vanadate oxidizes the air pollutants through photocatalysis in daylight or under the normal lighting condition; and the catalyst loading base material does not need the temperature treatment at a temperature of more than 100 DEG C, can endow more indoor decorating materials with novel function of visible light catalytic purification, and has wide application prospect in the field of air pollution purification.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis and air purification. The invention relates to a material and a method for improving the effect of purifying air pollutants by a visible light catalyst. Background technique [0002] Nowadays, indoor toluene, formaldehyde and other polluting gases are widely present in various relatively closed environments such as living rooms. Serious harm to human health. The main methods of air purification equipment developed at present include physical adsorption, chemical methods, and catalytic technologies. Among them, physical adsorption is greatly affected by the environment, and the adsorbed gas is easily released again due to the influence of temperature, humidity changes and adsorption balance, and cannot fundamentally eliminate harmful gases. Chemical methods can oxidize and degrade polluting gases, but the artificial synthetic substances added in them are likely to cause secondary pollutio...

Claims

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Application Information

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IPC IPC(8): B01J23/847B01J37/02B01D53/86F24F3/16A61L9/18
Inventor 柳丽芬索静杨凤林
Owner DALIAN UNIV OF TECH
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