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Bismuth oxybromide photocatalyst modified by surface oxygen vacancies and preparation method thereof

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

Active Publication Date: 2021-01-29
NINGXIA UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Bismuth oxybromide photocatalyst modified by surface oxygen vacancies and preparation method thereof
  • Bismuth oxybromide photocatalyst modified by surface oxygen vacancies and preparation method thereof
  • Bismuth oxybromide photocatalyst modified by surface oxygen vacancies and preparation method thereof

Examples

Experimental program
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Effect test

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 bismuth oxybromide photocatalyst modified by surface oxygen vacancies and a preparation method thereof, and relates to the technical field of photocatalysis. The present invention prepares the bismuth oxybromide material through the chemical precipitation method, and the bismuth oxybromide material includes BiOBr or Bi 24 o 31 Br 10 . Then the bismuth oxybromide powder is dispersed in methanol-water solution, nitrogen aeration treatment, visible light irradiation to obtain the surface oxygen vacancy modified bismuth oxybromide photocatalyst. The preparation method of the oxygen vacancy modified bismuth oxybromide photocatalyst is simple, easy to operate, strong in repeatability and low in cost, and can significantly improve the absorption rate of visible light.

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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Patent Type & Authority Patents(China)
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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