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Surface oxygen vacancy-modified bismuth oxybromide photocatalyst and preparation method thereof

A photocatalyst, bismuth oxybromide technology, applied in the field of photocatalysis, can solve the problems of limited visible light response range, low photogenerated carrier generation rate, etc., and achieve the effect of simple process, low cost and strong repeatability

Active Publication Date: 2018-12-14
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still many disadvantages of monoclinic BiOBr photocatalysts
For example, limited visible light response range and low photocarrier generation rate

Method used

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  • Surface oxygen vacancy-modified bismuth oxybromide photocatalyst and preparation method thereof
  • Surface oxygen vacancy-modified bismuth oxybromide photocatalyst and preparation method thereof
  • Surface oxygen vacancy-modified bismuth oxybromide photocatalyst and preparation method thereof

Examples

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Embodiment 1

[0047] A kind of surface oxygen vacancy modified BiOBr photocatalyst provided in this embodiment is prepared according to the following method:

[0048] 1) Preparation of BiOBr:

[0049] 1.5mmol of Bi(NO 3 ) 3 ·H 2 O was dissolved in 50 mL of ethylene glycol solution, stirred at room temperature for 1 h to obtain the first solution; 1.5 mmol of KBr was dissolved in 20 mL of ethylene glycol, stirred for 1 h to obtain the second solution; the second solution was added dropwise to In the first solution, a mixed solution was obtained; the mixed solution was placed in a water bath at 85°C and heated for 3.5 hours, then stirred at room temperature for 1 hour to room temperature, and then the solution was added dropwise to 100mL 10v / v% ethanol solution with a dropper to obtain The white precipitate was washed three times with ultrapure water and absolute ethanol, and dried at 75°C for 5 hours to obtain white BiOBr;

[0050] 2) Preparation of surface oxygen vacancy modified BiOBr:...

Embodiment 2

[0053] A surface oxygen vacancy modified BiOBr photocatalyst provided in this example differs from Example 1 in that: 2) 5v / v% methanol aqueous solution is used in the preparation of surface oxygen vacancy modified BiOBr.

Embodiment 3

[0055] A kind of surface oxygen vacancy modified BiOBr photocatalyst provided in this example differs from Example 1 in that: 2) In the preparation of surface oxygen vacancy modified BiOBr, the wavelength of the filter used is 350nm≤λ ≤780nm.

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Abstract

The invention discloses a surface oxygen vacancy-modified bismuth oxybromide photocatalyst and a preparation method thereof. The invention relates to the technical field of photocatalysis. According to the invention, a bismuth oxybromide material is prepared through a chemical precipitation method, and the bismuth oxybromide material comprises BiOBr or Bi24O31Br10. Then, bismuth oxybromide powderis dispersed in a methanol-water solution, and nitrogen aeration treatment and visible light illumination are carried out, so that to the surface oxygen vacancy-modified bismuth oxybromide photocatalyst is obtained. The preparation method of the oxygen vacancy-modified bismuth oxybromide photocatalyst is simple, is easy to operate, and is high in repeatability and low in cost, and the absorption rate of visible light can be remarkably improved.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, and in particular to a preparation method of a bismuth oxybromide photocatalyst modified by surface oxygen vacancies. Background technique [0002] The rapid development of human society has also brought about increasingly serious environmental pollution problems. Among them, the water pollution problem has become one of the environmental problems that need to be solved urgently. The pollutants existing in water are mainly refractory organic substances. Researchers have done a lot of research to find ways to degrade these organic substances, and the emergence of photocatalysts provides a new way to solve the problem of water pollution. Photocatalytic technology has potential application value in solving water pollution problems in the future because it can convert light energy into chemical energy. [0003] As a new layered material, bismuth oxyhalide compounds have been widely used in e...

Claims

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Application Information

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IPC IPC(8): B01J27/08
CPCB01J27/08B01J35/39
Inventor 邢永雷倪刚晋晓勇兀浩
Owner NINGXIA UNIVERSITY
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