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Bismuth oxyhalogen photocatalytic foam and preparation method thereof

A photocatalytic and bismuth oxyhalide technology, applied in the field of photocatalytic materials, can solve the problems of reduced light absorption effect, high price, complicated preparation process, etc., and achieves low requirements on raw materials and equipment, convenient use and recovery, and excellent photocatalytic performance. Effect

Active Publication Date: 2016-07-13
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 1) The utilization rate of sunlight is insufficient, and it cannot absorb visible light energy, so it is necessary to add an ultraviolet light source in most applications;
[0012] 2) Nano titanium dioxide (TiO 2 ) The price is high, the preparation process is complicated, and the catalytic performance is not high;
[0013] 3) Most of the titanium dioxide (TiO 2 ) The photocatalyst loading process reduces the surface area of ​​the catalyst and reduces the light absorption effect, resulting in a further decline in the degradation ability of the finished photocatalyst, which cannot meet the increasingly urgent requirements for dealing with air and water pollution

Method used

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  • Bismuth oxyhalogen photocatalytic foam and preparation method thereof
  • Bismuth oxyhalogen photocatalytic foam and preparation method thereof
  • Bismuth oxyhalogen photocatalytic foam and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] A bismuth oxyhalide photocatalytic foam was prepared, and BiOBr was selected as the photocatalyst. See attached figure 1 , the preparation process is as follows:

[0052] 1) Material preparation. First, the 10gBi(NO 3 ) 3 ·5H 2 O was dissolved in 100mL ethylene glycol (analytical grade) under heating and stirring to obtain solution A; secondly, 10g KBr was stirred and dissolved in 100mL water to obtain solution B; finally, the open-cell polyurethane foam was cut into 2cm side length The cube was ultrasonically cleaned with 100ml ethanol (analytical grade) for 35min.

[0053] 2) Carrier impregnation. In the case of both A and B solutions being magnetically stirred, first put the polyurethane foam into the A solution, and clamp it out after about 20-30 seconds of reaction (the first immersion requires the foam to fully absorb the solution and produce volume expansion; if it is not the first time Dipping, the solution will become turbid obviously during the reaction...

Embodiment 2

[0057] To prepare density-tunable photocatalytic foams, BiOI was selected as the photocatalyst. See attached figure 1 , the preparation process is as follows:

[0058] 1) Material preparation. First, the 10gBi(NO 3 ) 3 ·5H 2 O was dissolved in 100mL ethylene glycol (analytical grade) solution under heating and stirring to obtain A solution; secondly, 5g KI was stirred and dissolved in 100mL water to obtain B solution; finally, the open-cell polyurethane foam with a pore diameter of about 1mm was Cut into cubes with a side length of 2 cm, and ultrasonically clean them with 100 ml of ethanol (analytical grade) for 35 min.

[0059] 2) Carrier impregnation. In the case of both A and B solutions being magnetically stirred, first put the polyurethane foam into the A solution, and clamp it out after about 20-30 seconds of reaction (the first immersion requires the foam to fully absorb the solution and produce volume expansion; if it is not the first time Dipping, the solution ...

Embodiment 3

[0063] In order to further increase the loading capacity of photocatalyst, the surface of polyurethane foam was roughened. 10gK 2 CrO 4 Dissolve in 100mL of 10% sulfuric acid to form a solution. Polyurethane foam was cut into cubes with a side length of 2 cm, and ultrasonically cleaned with 100 ml of ethanol (analytical grade) for 35 min. Put each polyurethane square into the solution for 30 seconds, then put it in clean water for washing.

[0064] See attached Figure 8 And attached Figure 9 It can be seen that after the surface roughening treatment, the surface of the polyurethane foam is rougher, and the rough sites make the photocatalyst easier to grasp, and also make the photocatalyst adhere more firmly and not easy to fall off. The obtained photocatalyst product has a more uniform photocatalyst loading and improved loading effect.

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Abstract

The invention discloses bismuth oxyhalogen photocatalytic foam and a preparation method thereof. The photocatalytic foam comprises two parts, namely a bismuth oxyhalogen photocatalyst and carrying foam; the carrying foam is a carrier of the photocatalyst; the photocatalyst is attached to the carrying foam through a production process; series of bismuth oxyhalogen photocatalytic foam products can be formed by changing the carrying foam and the photocatalyst. The preparation method comprises three steps, namely material preparation, carrier impregnation, and washing and drying. The series of the photocatalyst products provided by the invention can absorb visible light and ultraviolet light; a loading process is simple; load combination is firm; degradation performance is excellent; the photocatalyst is loaded on the foam, so that an adsorption function of the product is increased; the photocatalyst products are beneficial to the recovery and repeated application of a catalyst; the density of the photocatalytic foam can be adjusted as required to adapt to various actual application situations.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to a bismuth oxyhalide photocatalytic foam and a preparation method thereof. Background technique [0002] 1. Photocatalytic technology and its significance [0003] With the rapid economic development in recent decades, environmental pollution problems have become increasingly serious, such as waste water, waste gas, and waste residues discharged from industrial production, toxic and harmful chemicals from industrial and agricultural production, and smoke, sewage, and garbage discharged from people's lives. Pollution has seriously threatened human existence. Therefore, how to effectively control pollution and protect the environment has become a problem faced by today's society and needs to be solved urgently. Photocatalysis has unique properties such as deep reaction at room temperature and direct use of solar energy as a light source to drive the reaction. It h...

Claims

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Application Information

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IPC IPC(8): B01J31/26B01J31/06B01J35/10B01J20/26B01J20/28
CPCB01J20/262B01J20/28045B01J20/28095B01J31/06B01J31/26B01J35/39B01J35/657
Inventor 黄洪伟张以河王硕博
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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