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BiOBr/SiO2 composite aerogel photocatalytic material and preparation method and applications thereof

A technology of photocatalytic materials and composite airgel, which is applied in the field of BiOBr/SiO2 composite airgel photocatalytic materials and its preparation, can solve the problems of low adsorption, achieve high adsorption, low energy consumption, and simplify the production process Effect

Inactive Publication Date: 2019-06-18
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem of low adsorption of BiOBr in the field of photocatalytic technology application is effectively solved

Method used

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  • BiOBr/SiO2 composite aerogel photocatalytic material and preparation method and applications thereof
  • BiOBr/SiO2 composite aerogel photocatalytic material and preparation method and applications thereof
  • BiOBr/SiO2 composite aerogel photocatalytic material and preparation method and applications thereof

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Effect test

Embodiment 1

[0039] The following embodiments will further illustrate the present invention in conjunction with the accompanying drawings.

[0040] (1), 3 mol of Bi(NO 3 ) 3 ·5H 2 O was ultrasonically dissolved in 10 mL of ethylene glycol; after being dissolved, it was mixed with 20 mL of tetraethyl orthosilicate, and stirred in a magnetic stirrer for 30 min;

[0041] (2), weigh 3 mol KBr and dissolve in 5 mL water;

[0042] (3), slowly drop the solution of step (2) into step 1), after magnetic stirring for 30 min, slowly add 0.1 mol / L hydrochloric acid to adjust the system pH=4 and continue magnetic stirring for 20 min;

[0043] (4) After heating in a water bath for 4 h, cool naturally. Under magnetic stirring, use 0.1 mol / L ammonia water to adjust the pH of the system to 8. When the solution becomes viscous, take out the rotor and let it stand still to make it gel.

[0044] (5) Add 20 mL of absolute ethanol for aging for 15 h after gelation, and then perform solvent replacement with 2...

Embodiment 2

[0047] The following embodiments will further illustrate the present invention in conjunction with the accompanying drawings.

[0048] (1), 5 mol of Bi(NO 3 ) 3 ·5H 2 O was ultrasonically dissolved in 10 mL of ethylene glycol; after being dissolved, it was mixed with 20 mL of tetraethyl orthosilicate, and stirred in a magnetic stirrer for 30 min;

[0049] (2), weigh 5 mol KBr and dissolve in 5 mL water;

[0050] (3), the solution of step 2) is slowly added dropwise to step 1), after magnetic stirring for 30 min, slowly add 0.1 mol / L hydrochloric acid to adjust the system pH=4 and continue magnetic stirring for 20 min;

[0051] (4) After heating in a water bath for 4 h, cool naturally. Under magnetic stirring, use 0.1 mol / L ammonia water to adjust the pH of the system to 8. When the solution becomes viscous, take out the rotor and let it stand still to make it gel.

[0052] (5) Add 20 mL of absolute ethanol for aging for 15 h after gelation, and then perform solvent replac...

Embodiment 3

[0055] The following embodiments will further illustrate the present invention in conjunction with the accompanying drawings.

[0056] (1), 1 mol of Bi(NO 3 ) 3 ·5H 2 O was ultrasonically dissolved in 10 mL of ethylene glycol; after being dissolved, it was mixed with 20 mL of tetraethyl orthosilicate, and stirred in a magnetic stirrer for 30 min;

[0057] (2), weigh 1 mol KBr and dissolve in 5 mL water;

[0058] (3), slowly drop the solution of step (2) into step 1), after magnetic stirring for 30 min, slowly add 0.1 mol / L hydrochloric acid to adjust the system pH=4 and continue magnetic stirring for 20 min;

[0059] (4) After heating in a water bath for 4 h, cool naturally. Under magnetic stirring, use 0.1 mol / L ammonia water to adjust the pH of the system to 8. When the solution becomes viscous, take out the rotor and let it stand still to make it gel.

[0060] (5) Add 20 mL of absolute ethanol for aging for 15 h after gelation, and then perform solvent replacement with...

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Abstract

The invention relates to a BiOBr / SiO2 composite aerogel photocatalytic material, which is prepared by an acid-alkali two-step method. At first, a bismuth source and a bromine source are dissolved in asolvent (anhydrous ethanol or glycol), which is necessary for preparing SiO2 composite aerogel, and water; then anhydrous ethanol (or glycol), ethyl n-silicate, and water are prepared according to avolume ratio of 4:2:1; and finally BiOBr / SiO2 composite aerogel is prepared by an acid-alkali two-step method. The technology is simple, and the prepared BiOBr / SiO2 composite aerogel has the characteristics of BiOBr such as high visible light catalytic activity, and the like, and also has the advantages of silica aerogel, such as high specific surface area, strong adsorption performance, and the like. The BiOBr / SiO2 composite aerogel photocatalytic material can be used as a photocatalytic material and can be applied to the organic sewage processing field.

Description

technical field [0001] The invention relates to the technical field of physical adsorption and chemical catalysts, in particular to a BiOBr / SiO 2 Composite airgel photocatalytic material and preparation method thereof. Background technique [0002] With the development of society and the continuous improvement of people's living standards, the accompanying environmental pollution has become increasingly serious. The types and contents of organic pollutants detected in the water environment are increasing day by day, most of which are refractory organic pollutants. A large amount of organic matter accumulates in the water for a long time, and finally enters the biological chain, which poses a huge threat to human health. Therefore, it is particularly important to develop green and environmentally friendly sewage treatment technologies. Among many sewage treatment processes, photocatalytic technology is considered to be the most effective due to its outstanding advantages s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/28B01J20/30C02F1/30B01J27/06C02F101/30
Inventor 杜毅杜民兴丰义兵
Owner QILU UNIV OF TECH
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