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Bismuth oxybromide with three-dimensional flower-like structure and its preparation method and application

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

Active Publication Date: 2021-11-16
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 with three-dimensional flower-like structure and its preparation method and application
  • Bismuth oxybromide with three-dimensional flower-like structure and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0031] A cetyltrimethylammonium bromide solution and a bismuth nitrate solution are prepared, wherein the concentration of the cetyltrimethylammonium bromide solution is 0.1 mol / L, and the concentration of the bismuth nitrate solution is 0.5 mol / L. The hexadecyltrimethylammonium bromide solution and the bismuth nitrate solution are mixed, and vortexed to make the mixture evenly mixed to obtain a mixed solution, wherein the molar ratio of bromide ion to bismuth ion is 1:1.

[0032] The mixed solution 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 repeated washing with absolute ethanol and deionized water for three times. The obtained three-dimensional flower-like structure of bismuth oxybromide is scann...

Embodiment 2

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

[0035] A dodecyl trimethyl ammonium bromide solution and a bismuth nitrate solution are prepared and mixed, and vortexed to make them evenly mixed to obtain a mixed solution, wherein the molar ratio of bromide ion to bismuth ion is 2:1. The mixed solution was allowed to stand 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 bismuth oxybromide with a three-dimensional flower-like structure. The obtained three-dimensional flower-like structure of bismuth oxybromide is scanned by electron microscope, and it can be seen that the three-dimensional flower-like structure of bismuth oxybromide is composed of bismuth oxybromide nanosheets with an average thickness of 30 nm. The average maximum radial dimension is 24 μm.

Embodiment 3

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

[0038]Dodecyltrimethylammonium bromide solution and bismuth nitrate solution are prepared and mixed, and vortexed to make them evenly mixed to obtain a mixed solution, wherein the molar ratio of bromide ion to bismuth ion is 1:2. The mixed solution was allowed to stand at 25° C. for 15 hours for reaction and self-assembly, and then filtered to obtain bismuth oxybromide with a three-dimensional flower-like structure. Through 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 method for preparing bismuth oxybromide with a three-dimensional flower-like structure, comprising: providing a quaternary ammonium bromide salt solution and a bismuth nitrate solution, and uniformly mixing the quaternary ammonium bromide salt solution and the bismuth nitrate solution to obtain Mixed solution; filter the mixed solution after standing at room temperature for 10h-30h to obtain a precipitate, and wash the precipitate to obtain bismuth oxybromide with a three-dimensional flower-like structure; the preparation process is simple and the reaction conditions are mild , without heating, reaction and self-assembly can occur at room temperature; the reaction speed is fast, the cost is low, and no complicated reaction equipment is needed; the prepared three-dimensional flower-like structure of bismuth oxybromide has excellent visible light response ability and high photocatalytic efficiency , which is conducive to its application in the field of photocatalysis.

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. Under the action of visible light, bismuth oxybromide can decompose organic dyes into carbon dioxide and water molecules, 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 gas sensing, cosmetics, selective oxidation catalysts, ionic conductors, ferroelectric mater...

Claims

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Application Information

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