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Nano silver/silver bromide/bismuth oxybromide heterogeneous visible light photo-catalytic material and preparation method thereof

A photocatalytic material, the technology of bismuth oxybromide, applied in the field of photocatalytic materials, can solve the problems of high carrier recombination rate and poor light absorption, and achieve the effect of low cost, low cost and improved photocatalytic performance

Inactive Publication Date: 2013-02-13
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of poor light absorption and high carrier recombination rate of traditional photocatalytic materials, as well as the complexity of the method for preparing silver halide nanomaterials, the present invention provides a high-efficiency nano silver / silver bromide based on nano silver halide / Bismuth Oxybromide Heterogeneous Visible Light Photocatalytic Materials

Method used

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  • Nano silver/silver bromide/bismuth oxybromide heterogeneous visible light photo-catalytic material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Dissolve 0.97g of bismuth nitrate and 0.99g of 1-dodecyl-3-methylimidazole bromide in 40mL of ethylene glycol methyl ether, respectively, and magnetically stir for 30 minutes to dissolve completely. The two solutions were then mixed and stirring was continued for 10 minutes before finally being transferred to a closed autoclave. Placed at 160°C for 2 hours to react. After being cooled to room temperature, the product was collected, washed, and vacuum-dried to obtain bismuth oxybromide microspheres with hierarchical structure.

[0017] (2) 0.305g of bismuth oxybromide microspheres are added to the ethylene glycol solution containing 0.085g of silver nitrate, the molar ratio of bismuth oxybromide and silver nitrate is 2: 1, magnetic stirring is carried out at room temperature for 6 hours, silver ions and bromine Bismuth oxide undergoes an ion exchange reaction to form a silver bromide / bismuth oxybromide structure.

[0018] (3) The silver bromide / bismuth oxybromide m...

Embodiment 2

[0020] (1) Dissolve 0.97g of bismuth nitrate and 0.99g of 1-dodecyl-3-methylimidazole bromide in 40mL of ethylene glycol methyl ether, respectively, and magnetically stir for 30 minutes to dissolve completely. The two solutions were then mixed and stirring was continued for 10 minutes before finally being transferred to a closed autoclave. Placed at 160°C for 2 hours to react. After being cooled to room temperature, the product was collected, washed, and vacuum-dried to obtain bismuth oxybromide microspheres with hierarchical structure.

[0021] (2) 0.305g of bismuth oxybromide microspheres are added to the ethylene glycol solution containing 0.042g of silver nitrate, the mol ratio of bismuth oxybromide and silver nitrate is 4: 1, magnetic stirring under room temperature for 8 hours, silver ion and bromine Bismuth oxide undergoes an ion exchange reaction to form a silver bromide / bismuth oxybromide structure.

[0022] (3) The silver bromide / bismuth oxybromide material is irra...

Embodiment 3

[0024] (1) Dissolve 0.97g of bismuth nitrate and 0.99g of 1-dodecyl-3-methylimidazole bromide in 40mL of ethylene glycol methyl ether, respectively, and magnetically stir for 30 minutes to dissolve completely. The two solutions were then mixed and stirring was continued for 10 minutes before finally being transferred to a closed autoclave. Placed at 160°C for 2 hours to react. After being cooled to room temperature, the product was collected, washed, and vacuum-dried to obtain bismuth oxybromide microspheres with hierarchical structure.

[0025] (2) 0.305g of bismuth oxybromide microspheres are added to the ethylene glycol solution containing 0.021g of silver nitrate, the mol ratio of bismuth oxybromide and silver nitrate is 8: 1, magnetically stirred at room temperature for 12 hours, silver ions and bromine Bismuth oxide undergoes an ion exchange reaction to form a silver bromide / bismuth oxybromide structure.

[0026] (3) The silver bromide / bismuth oxybromide material is ir...

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Abstract

The invention relates to a nano silver / silver bromide / bismuth oxybromide heterogeneous visible light photo-catalytic material and a preparation method thereof. The preparation method comprises the following steps: respectively dissolving bismuth nitrate and brominated 1-dodecyl-3-methylimidazole in ethylene glycol methyl ether; mixing the two solutions, placing the mixed solution into a closed high pressure autoclave, and reacting at a temperature of 140-180 DEG C for 2-12 hours so as to obtain bismuth oxybromide microbeads in hierarchical structures; adding the prepared bismuth oxybromide microbeads into a glycol solution containing silver nitrate, magnetically stirring at room temperature for 6-12 hours so as to generate a silver bromide / bismuth oxybromide material; and irradiating the silver bromide / bismuth oxybromide material for 5-30 minutes under 300W xenon lamp lights, thus finally obtaining the sliver / silver bromide / bismuth oxybromide heterogeneous visible light photo-catalytic material. The method related by the invention can be realized at room temperature and normal pressure, the cost is low, the operations of equipment are simple, and mass production can be performed, so that the method has an important potential application in industrial production. The prepared sliver / silver bromide / bismuth oxybromide heterogeneous visible light photo-catalytic material has the advantage of good visible light absorption; the separation of photon-generated carriers is obviously improved; and the photo-catalytic activity of the material is greatly improved.

Description

technical field [0001] The invention relates to a novel nano-silver / silver bromide / bismuth oxybromide visible light photocatalytic material and a preparation method thereof, belonging to the technical field of photocatalytic materials. Background technique [0002] For decades, the purification of organic pollutants and pathogenic microorganisms in sewage has become a thorny issue of concern to people. Traditional disinfection methods, such as autoclaving and bleach treatment, inevitably consume large amounts of energy or produce toxic by-products. As an alternative method, based on titanium dioxide (TiO 2 ) heterogeneous photocatalysis is more attractive. However, wide bandgap and low quantum efficiency are two bottlenecks restricting its practical application. In order to make full use of solar energy concentrated in the visible and infrared regions, the development of highly efficient visible light photocatalytic materials has broad prospects and is also essential. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/08C02F1/30A01N59/16A01P1/00
CPCY02W10/37
Inventor 秦晓燕程合锋黄柏标张晓阳
Owner SHANDONG UNIV