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Au/Bi24O31Br10 composite photocatalyst and preparation method thereof

A bi24o31br10, composite light technology, applied in the field of photocatalysis, can solve the problems of high preparation conditions, high toxicity of materials, difficult application, etc., and achieve the effects of simple preparation process, improved absorption range, and improved photocatalytic efficiency

Pending Publication Date: 2018-11-16
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although many visible light-responsive photocatalysts have been reported, there are still many problems in these materials, such as high toxicity, high preparation conditions, instability, and difficulty in practical application.

Method used

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  • Au/Bi24O31Br10 composite photocatalyst and preparation method thereof
  • Au/Bi24O31Br10 composite photocatalyst and preparation method thereof
  • Au/Bi24O31Br10 composite photocatalyst and preparation method thereof

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preparation example Construction

[0024] The embodiment of the present invention provides an Au / Bi 24 o 31 Br 10 The preparation method of composite photocatalyst comprises the following steps:

[0025] S1, BiOBr was prepared by chemical precipitation;

[0026] S2, BiOBr was calcined to obtain flake Bi 24 o 31 Br 10 ;

[0027] S3, will Bi 24 o 31 Br 10 Disperse in water, add chloroauric acid solution, and then carry out nitrogen aeration and xenon lamp irradiation treatment to obtain a suspension, which is separated, washed and dried to obtain Au / Bi 24 o 31 Br 10 composite photocatalyst.

[0028] Semiconductor Bi 24 o 31 Br 10 is a photocatalyst responsive to visible light, but due to the Bi 24 o 31 Br 10 The specific surface area of ​​the material is small, there are many defects, and the recombination rate of photogenerated carriers inside the material is high. By using Au nanoparticles with flake Bi 24 o 31 Br 10 For recombination, the Au particles are deposited on the sheet-like Bi by...

Embodiment 1

[0049] Embodiment 1 (0.5Au-Bi 24 o 31 Br 10 )

[0050] A kind of Au / Bi that the present embodiment provides 24 o 31 Br 10 Composite photocatalyst, it is made according to the following steps:

[0051] 1) Bi 24 o 31 Br 10 preparation of

[0052] 10mmol of Bi(NO 3 ) 3 ·H 2 O was dissolved in 100mL ethylene glycol, ultrasonicated for 30min, and stirred for 12h to obtain solution A;

[0053] Dissolve 10 mmol of KBr in 50 mL of ethylene glycol, sonicate for 30 min, and stir for 12 h to obtain solution B;

[0054] Solution B was added dropwise to solution A, stirred for 1 h, and then heated in a water bath at 85° C. for 3.5 h. Then quickly dropwise added to 150mL ethanol-water solution (v / v=1:2) to obtain a white precipitate C, which was washed three times with ultrapure water and absolute ethanol, and dried at 70°C for 5h to obtain a white powder D: Transfer the powder D to a muffle furnace, heat it up to 600°C at a heating rate of 5°C / min, and keep it for 2h to obta...

Embodiment 2

[0057] Embodiment 2 (1Au-Bi 24 o 31 Br 10 )

[0058] A kind of Au / Bi that the present embodiment provides 24 o 31 Br 10 Composite photocatalyst, the difference with embodiment 1 is: 2) Au / Bi 24 o 31 Br 10 For the preparation, add 1.214 mL of 10 mM HAuCl 4 Solution (HAuCl 4 is 0.005g).

[0059] Such as figure 2 Shown is the prepared 1Au-Bi 24 o 31 Br 10 The scanning electron microscope image, it can be seen that Au particles are loaded on the sheet-like Bi 24 o 31 Br 10 and the Au particles are evenly distributed.

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Abstract

The invention provides an Au / Bi24O3Br10 composite photocatalyst and a preparation method thereof, and relates to the technical field of the photocatalysis. The preparation method comprises the following steps: preparing BiOBr through a chemical precipitation method, roasting BiOBr to obtain sheet Bi24O3Br10; dispersing Bi24O31Br10 into water, adding a chloroauric acid solution, and then performingnitrogen aeration and xenon lamp radiation treatment to obtain a suspension; separating, washing and drying to obtain the Au / Bi24O31Br10 composite photocatalyst. The uniform Au particles are loaded on the sheet Bi24O31Br10 through chemical precipitation, high-temperature calcination and photodeposition methods; the preparation process is simple; the particle size is controllable; the band gap ofthe photocatalyst is adjustable; and the absorption range on the visible light by the photocatalyst is effectively improved. The metal particles are loaded through the photodeposition method, and thephotocatalysis efficiency is improved.

Description

technical field [0001] The present invention relates to the field of photocatalysis, and in particular to an Au / Bi 24 o 31 Br 10 Composite photocatalyst and preparation method thereof. Background technique [0002] In recent years, environmental pollution has increasingly become a major problem threatening human survival and health. Especially for water pollution caused by dyes, antibiotics and phenolic compounds, photocatalytic technology has become an important means to solve this problem in the future. At present, various semiconductor materials have emerged as photocatalysts, but many semiconductor materials have a large band gap and can only absorb ultraviolet light, which greatly limits the practical application of semiconductor materials. Visible light-responsive photocatalysis can make full use of sunlight to achieve complete degradation of refractory organics. Although many visible light-responsive photocatalysts have been reported, there are still many problem...

Claims

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Application Information

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IPC IPC(8): B01J27/06B01J37/03B01J37/08B01J37/34C02F1/30C02F101/30
CPCC02F1/30B01J27/06B01J37/031B01J37/08B01J37/341C02F2101/30C02F2305/10B01J35/39
Inventor 邢永雷倪刚晋晓勇兀浩
Owner NINGXIA UNIVERSITY
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