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Compound bismuthyl bromide photocatalyst

A photocatalyst, bismuth oxybromide technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low catalytic activity of visible light, narrow visible light response, limited visible light absorption, etc. Achieve the effect of wide photoresponse range, good photocatalytic ability and low price

Inactive Publication Date: 2014-03-26
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the limitation of the application of BiOBr photocatalyst is that its bandgap width is 2.85eV, the absorption of visible light is limited, the response of visible light is narrow, and the photogenerated electron-hole recombination is easy, so its visible light catalytic activity is not high.

Method used

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  • Compound bismuthyl bromide photocatalyst
  • Compound bismuthyl bromide photocatalyst
  • Compound bismuthyl bromide photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Sinopharm bismuth nitrate pentahydrate (Bi(NO3)3 5H2O) 1.3485g was dissolved in 40ml water, stirred at room temperature until a homogeneous solution A was formed, and 0.5467g cetyltrimethylammonium bromide (CTAB) and 0.3581g di Sodium tungstate hydrate (Na2WO4·2H2O), dissolved in 40ml water and stirred at room temperature until solution B was formed. Slowly drop solution A into solution B at a rate of 30 drops per minute, so that the molar ratio of reactants is Bi(NO3)3·5H2O:CTAB:Na2WO4·2H2O=2.78:1.5:1. After the mixture was stirred at room temperature for 30 minutes, it was transferred to a polytetrafluoroethylene kettle at 130°C for 18 hours of hydrothermal reaction, and after suction filtration, it was dried at 80°C for 12 hours. Get BiOBr / Bi 2 o 3 / WO 3 Composite photocatalytic materials. according to figure 2 -c, the sample obtained in Example 1 contains the characteristic diffraction peaks of BiOBr and Bi2O3 / WO3.

Embodiment 2

[0019] In the above-mentioned Example 1, the usage amount of cetyltrimethylammonium bromide was changed to 1.0132 g, and other conditions remained unchanged. Preparation of BiOBr / Bi2O3 / WO3 composite photocatalytic materials. according to figure 1 -a, the sample obtained in Example 2 contains BiOBr and Bi2O3 / WO3 crystal forms.

Embodiment 3

[0021] In the above example 1, the optimum ratio (Bi(NO3)3·5H2O:CTAB:Na2WO4·2H2O molar ratio is 2.78:1.5:1) was used, the hydrothermal temperature was changed to 100°C, and other conditions remained unchanged. Preparation of BiOBr / Bi2O3 / WO3 composite photocatalytic materials. according to figure 1 -b, the sample obtained in Example 3 contains BiOBr and Bi2O3 / WO3 crystal forms.

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Abstract

The invention discloses a compound bismuthyl bromide photocatalyst which is prepared by processing Bi(NO3)3.5H2O, CTAB and Na2WO4.2H2O as raw materials through a one-step hydrothermal method, contains BiOBr and Bi2O3 / WO3 and is in a heterogeneous structure; the shape of the photocatalyst is a chrysanthemum-like crystal structure formed by crossing sheet units. The photocatalyst is better in photocatalytic performance; a conduction band and a valence band of BiOBr and Bi2O3 / Bi2O3 / WO3 in the chrysanthemum-like crystal structure are stepwise embedded, photo-induced electrons are transferred to the conduction band of BiOBr, and photo-induced holes are transferred to the valence band of Bi2O3 / Bi2O3 / WO3, so that the photo-induced carrier separation can be promoted; the photocatalyst is large in specific surface area, wide in optical response range and long in life of the photo-induced electrons and the photo-induced holes, and can be widely applied in the fields of environmental pollution control and the like.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a bismuth oxybromide composite photocatalyst, which can be used to degrade organic pollutants in the environment. Background technique [0002] Bismuth oxybromide (BiOBr) is a semiconductor nano-photocatalyst with stable chemical properties, non-toxicity, low price and good catalytic activity. It is widely used in sewage treatment, dye degradation and purification of harmful gases. At present, the limitations of the application of BiOBr photocatalysts lie in its forbidden band width of 2.85eV, limited absorption of visible light, narrow visible light response, and easy recombination of photogenerated electrons and holes, making its visible light catalytic activity not high. Therefore, the research and development of photocatalysts with higher activity has great economic and scientific value. [0003] The heterojunction structure composite photocatalyst has a unique e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/132
Inventor 杨平周梦颖赵苏青桂成宜
Owner EAST CHINA NORMAL UNIV
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