Bismuth oxybromide visible-light-induced photocatalyst and preparation method thereof

A catalyst and visible light technology, applied in the field of new semiconductor photocatalytic materials, can solve the problems of complex method and difficult operation control, and achieve the effects of good purity, simple operation and high photogenerated carrier separation efficiency

Inactive Publication Date: 2018-01-12
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the current synthetic Bi 24 Br 10 o 31 The method is more complicated, and the operation is not easy to control

Method used

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  • Bismuth oxybromide visible-light-induced photocatalyst and preparation method thereof
  • Bismuth oxybromide visible-light-induced photocatalyst and preparation method thereof
  • Bismuth oxybromide visible-light-induced photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 1.2g of glucose to 50mL of ethylene glycol and stir at room temperature for 15min, then add 0.485g of Bi(NO 3 ) 3 .5H 2 O continue to stir, stir well and then add 0.06g KBr, and continue to stir for 12h to form a clear solution.

[0019] The above mixed solution was subjected to microwave reaction, the microwave power was 400W, and the reaction time was 4min. After the reaction, a gray-yellow precipitate was obtained, which was centrifuged, washed three times with deionized water and absolute ethanol, and the obtained solid was placed at 60°C Dry in an oven for 12 hours to obtain the precursor.

[0020] Bi 24 Br 10 o 31 catalyst of light. Its XRD pattern is as figure 1 As shown, Bi 24 Br 10 o 31 The diffraction peaks are consistent with the standard card, with high purity and good crystallinity. Bi 24 Br 10 o 31 The SEM pattern such as figure 2 As shown, it is in the shape of nano flower balls, and some of them collapse and break after calcination. ...

Embodiment 2

[0022] Add 2.4g glucose to 100mL ethylene glycol and stir at room temperature for 15min, then add 0.485gBi(NO 3 ) 3 .5H 2 O continue to stir, stir well and then add 0.06g KBr, and continue to stir for 48h to form a clear solution.

[0023] The above mixed solution was subjected to microwave reaction, the microwave power was 800W, and the reaction time was 3min. After the reaction, a gray-yellow precipitate was obtained, which was centrifuged, washed three times with deionized water and absolute ethanol, and the obtained solid was placed at 60°C. Dry in an oven for 12 hours to obtain the precursor.

[0024] Weigh 300 mg of the precursor and calcinate it in a muffle furnace at 400 °C for 4 hours to obtain Bi 24 Br 10 o 31 catalyst of light.

[0025] Using the Bi of the embodiment of the present invention 24 Br 10 o 31 In the experiment of catalytic conversion of benzyl alcohol into benzaldehyde under visible light irradiation, the selectivity of benzyl alcohol into benz...

Embodiment 3

[0027] Add 0.6g glucose to 100mL ethylene glycol and stir at room temperature for 15min, then add 0.485gBi(NO 3 ) 3 .5H 2 O continue to stir, stir well and then add 0.06g KBr, and continue to stir for 6h to form a clear solution.

[0028] The above mixed solution was subjected to microwave reaction, the microwave power was 200W, and the reaction time was 10min. After the reaction, a gray-yellow precipitate was obtained, which was centrifuged, washed three times with deionized water and absolute ethanol, and the obtained solid was placed at 60°C Dry in an oven for 12 hours to obtain the precursor.

[0029] Weigh 300 mg of precursor and calcinate in a muffle furnace at 500 °C for 2 hours to obtain Bi 24 Br 10 o 31 catalyst of light.

[0030] Using the Bi of the embodiment of the present invention 24 Br 10 o 31 In the experiment of catalytic conversion of benzyl alcohol into benzaldehyde under visible light irradiation, the selectivity of benzyl alcohol into benzaldehyde...

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Abstract

The invention discloses a preparation method of a Bi24Br10O31 visible-light-induced photocatalyst. According to the preparation method, ethylene glycol and glucose are used as a complexing agent and areductant, and a two-step method which combines microwave treatment and calcination is adopted; by the preparation method, operation is easy, large-scale production is easy, the obtained nanometer flower-like Bi24Br10O31 visible-light-induced photocatalyst is high in purity and high in degree of crystallinity, has high photogenerated carrier separation efficiency, high visible-light catalytic activity and high stability and can convert benzyl alcohol into benzaldehyde with high selectivity, and after a reaction for 2.5 hours, the conversion rate and the selectivity are as high as 99%; the preparation method has a very wide application prospect.

Description

Technical field: [0001] The invention relates to the technical field of novel semiconductor photocatalytic materials, in particular to a Bi 24 Br 10 o 31 Visible light catalyst and its preparation method and application. Background technique: [0002] While the continuous development of industry and agriculture has brought about a substantial improvement in living standards, it is also facing increasingly serious problems of environmental pollution and energy shortages. The semiconductor photocatalytic technology has the characteristics of high efficiency, energy saving, and environmental friendliness, and is considered to be one of the effective ways to solve environmental pollution and energy shortage. At present, photocatalytic technology is mainly used in photodegradation of organic pollutants, photolysis of water to produce hydrogen, fixation of nitrogen and carbon dioxide, and conversion of organic matter. The selective catalytic conversion of organic matter is a re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G29/00B01J27/06B01J37/34B01J37/08B01J37/16C07C45/29C07C47/54B01J37/03
Inventor 肖信郑春霞南俊民左晓希
Owner SOUTH CHINA NORMAL UNIVERSITY
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