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Black bismuth oxybromide photocatalyst and preparation method thereof

A technology of bismuth oxybromide and photocatalyst, which is applied in the field of photocatalysis, can solve the problems of low utilization rate of visible light and achieve the effects of improving photocatalytic performance, easy operation and simple process

Active Publication Date: 2015-03-04
怀仁市云领医药化工有限公司
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Problems solved by technology

[0004] Bismuth oxybromide is one of the bismuth oxyhalide photocatalytic materials, and it is also a typical visible light semiconductor photocatalyst. It has good photocatalytic degradation effect on organic pollutants such as dyes, chlorinated organic small molecules, microcystins, etc. , but previous studies have shown that although bismuth oxybromide can be directly excited by visible light, its utilization rate of visible light is significantly lower than that of TiO 2 / UV system, which is due to the less contribution of the O2P orbital in the valence band of bismuth oxybromide composed of two independent Br4P and O2P orbitals

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  • Black bismuth oxybromide photocatalyst and preparation method thereof
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  • Black bismuth oxybromide photocatalyst and preparation method thereof

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preparation example Construction

[0019] A kind of preparation method of black bismuth oxybromide photocatalyst of the present invention comprises the following steps:

[0020] (1) Preparation of white bismuth oxybromide: first dissolve bismuth nitrate in a certain volume of N,N-dimethylformamide solution to form a transparent solution, add a certain amount of potassium bromide aqueous solution, stir for a period of time, and dissolve the reactant Transfer to a 50mL stainless steel autoclave lined with polytetrafluoroethylene, react at 100-120°C for 5-10h, centrifuge the obtained product, and dry it in vacuum at 60°C for 5-10h to obtain a white bismuth oxybromide solid;

[0021] (2) Preparation of black bismuth oxybromide: Take a certain amount of white bismuth oxybromide sample prepared in step (1) and put it into a tube furnace. After 3-8 hours, a black bismuth oxybromide sample was obtained.

[0022] In order to better understand the present invention, the content of the present invention is further illust...

Embodiment example 1

[0023] Embodiment example 1: the preparation method of a kind of black bismuth oxybromide photocatalyst of the present invention, concrete preparation process is:

[0024] (1) Preparation of white bismuth oxybromide: Dissolve 1mmol bismuth nitrate in 10mL DMF to form a transparent solution, add potassium bromide solution (a solution formed by dissolving 1mmol potassium bromide in 30mL water), continue stirring for half an hour, and then transfer to 50mL In a stainless steel autoclave lined with polytetrafluoroethylene, react at 100°C for 8 hours. The obtained product was washed with deionized water, separated by centrifugation, and dried at 60° C. for 5 h to obtain a white solid.

[0025] (2) Preparation of black bismuth oxybromide: take a certain amount of white bismuth oxybromide sample prepared in step (1) and put it into a tube furnace. A black bismuth oxybromide sample was obtained.

[0026] The morphology of the prepared white bismuth oxybromide sample and black bismut...

Embodiment 2

[0027] Implementation example 2: the preparation method of a kind of black bismuth oxybromide photocatalyst of the present invention, concrete preparation process is:

[0028] (1) Preparation of white bismuth oxybromide: dissolve 1mmol bismuth nitrate in 20mL DMF to form a transparent solution, add potassium bromide solution (a solution formed by dissolving 1mmol potassium bromide in 20mL water), continue stirring for half an hour, and then transfer to In a 50mL stainless steel autoclave lined with polytetrafluoroethylene, react at 110°C for 10h. The obtained product was washed with deionized water, separated by centrifugation, and dried at 60° C. for 6 h to obtain a white solid.

[0029] (2) Preparation of black bismuth oxybromide: take a certain amount of white bismuth oxybromide sample prepared in step (1) and put it into a tube furnace. A black bismuth oxybromide sample was obtained.

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Abstract

The invention discloses a black bismuth oxybromide photocatalyst and a preparation method thereof, belonging to the field of photocatalysis. The black bismuth oxybromide photocatalyst is mainly characterized in that black bismuth oxybromide is high in absorption on visible light, and by oxygen deficiency, separation of photoproduction electron-hole is easy, so that the catalyst is high and efficient in photocatalysis capability. The preparation method comprises preparation steps of 1. preparing white bismuth oxybromide solids by a solvothermal method; and 2. putting a certain amount of the prepared white bismuth oxybromide sample into a tubular furnace, vacuumizing the tubular furnace, feeding high-purity inert gas, performing high-temperature treatment for 3-8 hours to obtain a black bismuth oxybromide sample. The method is simple and is easy to operate; the obtained black bismuth oxybromide photocatalyst is high in visible light catalyst performance.

Description

technical field [0001] The invention belongs to the field of photocatalysis, and relates to the preparation of a white bismuth oxybromide photocatalytic material by a solvothermal method, and the black bismuth oxybromide photocatalytic material is prepared by high-temperature treatment in an inert atmosphere, and the black bismuth oxybromide photocatalytic material is It has efficient visible light catalytic performance. Background technique [0002] The control of environmental pollution is the focus of human beings today and needs to be solved urgently, especially the environmental problems caused by toxic and refractory organic pollutants (such as halogenated substances, pesticides, dyes, etc.) have become a major issue affecting human survival and health. The purification of organic pollutants by photocatalytic technology has attracted much attention due to its advantages of low energy consumption, mild purification conditions, and no secondary pollution. It is a green e...

Claims

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Application Information

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IPC IPC(8): B01J27/06
Inventor 段芳汪晓凤王军施冬健魏取福陈明清
Owner 怀仁市云领医药化工有限公司
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