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Bismuth oxybromide of three-dimensional flower shaped structure, and preparation method and applications thereof

A bismuth oxybromide, three-dimensional flower-like technology, applied in the field of photocatalyst preparation, can solve the problems of high synthesis temperature, long reaction time, etc., and achieve the effects of fast reaction speed, high photocatalytic efficiency and wide application prospects

Active Publication Date: 2019-05-03
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, bismuth oxybromide is mainly synthesized by hydrothermal method, electrospinning, etc. Although the preparation technology is very mature, the current preparation method requires high synthesis temperature and long reaction time, and the preparation process requires the use of complex reaction equipment. , and the preparation process needs to add toxic organic solvents, etc.

Method used

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  • Bismuth oxybromide of three-dimensional flower shaped structure, and preparation method and applications thereof
  • Bismuth oxybromide of three-dimensional flower shaped structure, and preparation method and applications thereof
  • Bismuth oxybromide of three-dimensional flower shaped structure, and preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method of bismuth oxybromide with three-dimensional flower-like structure

[0031] A cetyltrimethylammonium bromide solution and a bismuth nitrate solution were prepared, wherein the concentration of the cetyltrimethylammonium bromide solution was 0.1 mol / L, and the concentration of the bismuth nitrate solution was 0.5 mol / L. Mix cetyltrimethylammonium bromide solution and bismuth nitrate solution, and vortex to mix them evenly to obtain a mixed solution, wherein the molar ratio of bromide ions to bismuth ions is 1:1.

[0032] The mixture was allowed to stand at 20° C. for 24 hours for reaction and self-assembly, and then filtered to obtain a precipitate. Then, the bismuth oxybromide photocatalyst with three-dimensional flower-like structure was obtained by cross-washing three times with absolute ethanol and deionized water. The bismuth oxybromide of the prepared three-dimensional flower-like structure is scanned by an electron microscope, and the results...

Embodiment 2

[0034] A preparation method of bismuth oxybromide with three-dimensional flower-like structure

[0035] Prepare and mix dedecyltrimethylammonium bromide solution and bismuth nitrate solution, and vortex to mix them evenly to obtain a mixed solution, wherein the molar ratio of bromide ions to bismuth ions is 2:1. The mixed solution was left standing at 15°C for 28 hours for reaction and self-assembly, and then filtered to obtain a precipitate, which was then washed with absolute ethanol and deionized water to obtain a three-dimensional flower-like structure of bismuth oxybromide. The bismuth oxybromide of the three-dimensional flower-like structure is scanned by an electron microscope, and it can be seen that the bismuth oxybromide of the three-dimensional flower-like structure is composed of bismuth oxybromide nanosheets with an average thickness of 30nm, and the bismuth oxybromide of the three-dimensional flower-like structure The average largest radial dimension is 24 μm.

Embodiment 3

[0037] A preparation method of bismuth oxybromide with three-dimensional flower-like structure

[0038]Dodecyltrimethylammonium bromide solution and bismuth nitrate solution were prepared and mixed, and vortexed to mix them evenly to obtain a mixed solution, wherein the molar ratio of bromide ions to bismuth ions was 1:2. The mixture was left at 25° C. for 15 h to react and self-assemble, and then filtered to obtain bismuth oxybromide with a three-dimensional flower-like structure. After electron microscope scanning, it can be seen that the bismuth oxybromide of the three-dimensional flower-like structure is composed of bismuth oxybromide nanosheets with an average thickness of 15 nm, and the average maximum radial dimension of the three-dimensional flower-like structure of bismuth oxybromide is 22 μm.

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Abstract

The invention provides a preparation method of bismuth oxybromide of a three-dimensional flower shaped structure. The preparation method comprises following steps: a quaternary ammonium bromide and abismuth nitrate solution are prepared, and are uniformly mixed so as to obtain a mixed solution; the mixed solution is allowed to stand at room temperature for 10 to 30h, and is filtered so as to obtain a precipitate; the precipitate is washed so as to obtain the bismuth oxybromide of a three-dimensional flower shaped structure. The preparation process is simple; reaction conditions are mild; heating is not needed; reaction and self assembling can be realized at room temperature conditions; reaction speed is fast, cost is low, and no complex reaction equipment is needed; the prepared bismuth oxybromide of a three-dimensional flower shaped structure possesses excellent visible light response capability, photocatalytic efficiency is high, and it is beneficial for applications of the bismuthoxybromide of a three-dimensional flower shaped structure in photocatalysis field.

Description

technical field [0001] The invention relates to the technical field of photocatalyst preparation, in particular to a bismuth oxybromide with a three-dimensional flower-like structure and a preparation method and application thereof. Background technique [0002] Bismuth oxybromide (BiOBr) is a new type of photocatalytic material with a square layered crystal structure; this special crystal structure makes it difficult for photogenerated electron-hole pairs to recombine, thereby promoting the application of photocatalytic degradation. Bismuth oxybromide can decompose organic dyes into carbon dioxide and water molecules under the action of visible light, and its catalytic efficiency is higher than that of commercial photocatalyst titanium dioxide. Therefore, bismuth oxybromide can be used to purify sewage and other aspects. In addition, bismuth oxybromide has important applications in the fields of gas sensing, cosmetics, selective oxidation catalysts, ion conductors, ferroele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06B01J35/02B01J35/10C01G29/00B01J35/00
Inventor 梁文朗郑健璐张文萃
Owner SHENZHEN UNIV
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