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Composite nano-photo-catalyst used for purifying air

A nanocomposite and photocatalyst technology, applied in the direction of physical/chemical process catalysts, catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low catalyst activity, benzene series and ammonia removal No obvious problems, etc., to achieve high decomposition activity and long service life

Inactive Publication Date: 2005-05-25
BIOCHEM ENG COLLEGE OF BEIJING UNION UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Chinese patent 00129180.7 announced "a photocatalyst for purifying air", which is based on TiO 2 Metallic platinum and magnesium, lithium, manganese and other metal oxides are loaded on the powder to make a powder catalyst. This catalyst is only active under ultraviolet light, and the removal of benzene series and ammonia is not obvious
Chinese patent 02801197 announced "a photocatalyst with catalytic activity even in the visible light range", which is a composite photocatalyst composed of two semiconductor oxides with heterojunction surfaces, and the activity of the catalyst is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Dissolve 100ml tetrabutyl titanate in 600ml methanol, add 40ml acetic acid and 20ml distilled water to make a sol with a concentration of 0.385mol / L butyl titanate for later use; in addition, 2 grams of ammonium metavanadate and 25 Disperse one gram of ferric ammonium alum in 50ml of methanol, add 10ml of a mixture of citric acid and acetic acid with a molar ratio of 1:2, adjust the pH to 0.8 with concentrated nitric acid, and stir at room temperature for 30 minutes to form a gel. Disperse the gel with 30ml of methanol, add it to the previous sol under stirring, continue to stir for 30 minutes to form a gel again, age the gel at about 40°C for 20 hours, dry it at 100-110°C, and cool to room temperature After grinding, calcining at 400-450° C. for 1 hour, a composite photocatalyst with an average particle diameter of 15-25 nm can be obtained.

Embodiment 2

[0024] Example 2: The raw materials tetrabutyl titanate, acetic acid and distilled water were dissolved in methanol to prepare a titanium sol, wherein the concentrations of tetrabutyl titanate, acetic acid and distilled water were 0.35, 1.0 and 1.5 mol / L respectively. Mix raw materials such as ammonium metavanadate and iron ammonium vitriol according to the molar ratio of metal ion: organic mixed acid: methanol 1:3:28, the atomic ratio of Fe and V is 4:1, and the molar ratio of citric acid and acetic acid in the organic mixed acid is 1 : 2. Adjust the pH value to 0.6 with concentrated nitric acid, and stir at room temperature to form a gel. The gel was dispersed with methanol in a molar ratio of methanol to metal ion of 8:1. Drop this solution into the titanium sol, the atomic ratio of Ti to Fe is 100:28, continue to stir to form a gel again, age the gel at about 40°C for 20 hours, dry it at 100-110°C, and grind it at 400°C ℃ for 2 hours to obtain a composite photocatalyst w...

Embodiment 3

[0025] Example 3: The raw materials tetrabutyl titanate, acetic acid and distilled water were dissolved in methanol to prepare a titanium sol, wherein the concentrations of tetrabutyl titanate, acetic acid and distilled water were 0.4, 1.2 and 1.5 mol / L respectively. Mix raw materials such as ammonium metavanadate and iron ammonium vitriol according to the molar ratio of metal ion: organic mixed acid: methanol 1:3:28, the atomic ratio of Fe and V is 100:30, and the molar ratio of citric acid and acetic acid in the organic mixed acid is 1 : 2. Adjust the pH value to 0.6 with concentrated nitric acid, and stir at room temperature to form a gel. The gel was dispersed with methanol in a molar ratio of methanol to metal ion of 8:1. Drop this solution into the titanium sol, the atomic ratio of Ti to Fe is 100:25, continue to stir to form a gel again, age the gel at about 40°C for 20 hours, dry it at 100-110°C, and grind it at 400°C ℃ for 2 hours to obtain a composite photocatalyst...

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Abstract

A composite nano-photocatalyst for cleaning air is composed of anatase-type TiO2, and the (15-25)-nm Fe2O3 and V2O5. It can effectively decompose the formaldehyde, benzene and ammonia in air under irradiation of light.

Description

technical field [0001] The invention relates to a nanocomposite photocatalyst, in particular to a nanocomposite photocatalyst for purifying air and a preparation method thereof. It belongs to the field of nano-catalysis technology. Background technique [0002] Most of the materials used for decoration, such as wood-based panels, foam plastics, wallpaper wall coverings, carpet floors, paint coatings, etc., can directly or indirectly release harmful gases (such as formaldehyde, benzene series, hydrogen sulfide and ammonia, etc.); Domestic exhaust gas, such as food spoilage exhaust gas, cooking smoke, cigarette gas, vehicle exhaust, etc., also contains these harmful gases; these invisible killers have brought a huge threat to people's health, and scientific researchers in various countries are seeking effective Advanced air purification technology in order to solve these problems. Traditional filtration, adsorption, negative oxygen ions and ozone technologies are difficult t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01J23/847B01J37/03
Inventor 周考文
Owner BIOCHEM ENG COLLEGE OF BEIJING UNION UNIV
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