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Preparation method of BiOBr/ZnO nano photocatalyst powder

A technology of nano-photocatalyst and photocatalytic activity, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of narrow spectral response range and low photon quantum efficiency, and achieve high reuse rate , The preparation process is simple, and it is convenient for large-scale production

Inactive Publication Date: 2013-12-25
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the following problems still exist in practical applications: low photon quantum efficiency and narrow spectral response range
As a typical n-type semiconductor, ZnO has strong photocatalytic oxidation ability and stable structure. If it is combined with p-type BiOBr to form a p-n junction, it is possible to obtain more excellent photocatalytic oxidation ability. However, so far, There is no report on compound semiconductor of BiOBr and ZnO

Method used

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  • Preparation method of BiOBr/ZnO nano photocatalyst powder
  • Preparation method of BiOBr/ZnO nano photocatalyst powder
  • Preparation method of BiOBr/ZnO nano photocatalyst powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0021] Add CTAB, sodium bromide at a molar ratio of 0.25 and zinc acetate dihydrate to an ethanol solvent with a Br / Zn molar ratio of 0.1, and stir at room temperature for 0.5 h to form a zinc precursor with a concentration of 0.03 mol / L, and add Bi( NO 3 ) 3 ·5H 2 O, wherein the Bi / Zn molar ratio is 0.8, continue to stir to obtain a milky white turbid liquid, transfer the formed turbid liquid into a Teflon high-pressure reactor, and perform a solvothermal reaction at a temperature of 160 °C for 19 h, and wash the obtained precipitate with distilled water and ethanol After washing and drying, the BiOBr / ZnO nanometer photocatalyst powder is obtained.

Embodiment approach 2

[0023] Add CTAB, potassium bromide and zinc nitrate hexahydrate at a molar ratio of 1 and zinc nitrate hexahydrate to an ethanol solvent with a molar ratio of Br / Zn of 1.5, stir at room temperature for 3 h to form a zinc precursor with a concentration of 0.1 mol / L, and add Bi(NO3 )3·5H2O, wherein the Bi / Zn molar ratio is 0.25, continue to stir to obtain a milky white cloudy liquid, transfer the formed cloudy liquid into a Teflon high-pressure reactor, and conduct a solvothermal reaction at a temperature of 100 °C for 6 h, and use Washing with distilled water and ethanol, and drying to obtain BiOBr / ZnO, nanometer photocatalyst powder.

Embodiment approach 3

[0025] Add CTAB, ammonium bromide at a molar ratio of 2 and zinc nitrate hexahydrate to an ethanol solvent with a Br / Zn molar ratio of 4, stir at room temperature for 5 h to form a zinc precursor with a concentration of 0.3 mol / L, and add Bi (NO 3 ) 3 ·5H 2 O, continue to stir to obtain a milky white turbid liquid, transfer the formed turbid liquid into a Teflon high-pressure reactor, and conduct a solvothermal reaction at a temperature of 140 °C for 15 h, wash the obtained precipitate with distilled water and ethanol, and dry it to obtain BiOBr / ZnO rice photocatalyst powder.

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Abstract

The invention discloses a preparation method of BiOBr / ZnO nano photocatalyst powder, belonging to the field of nano photocatalyst preparation. The method is characterized by comprising the steps of adding two bromine compounds CTAB (cetyl trimethyl ammonium bromide) and potassium bromide or sodium bromide at a proper proportion and a zinc-containing compound into an ethanol solvent, adding a bismuth-containing compound, and uniformly mixing; transferring the solution into a Teflon high-pressure reaction kettle, and performing a solvothermal reaction at certain temperature to generate precipitates; washing the precipitates with water and ethanol, and drying at 80 DEG C to obtain novel efficient BiOBr / ZnO nano photocatalyst powder. The method disclosed by the invention is quick, simple, convenient and high in operability, and the prepared BiOBr / ZnO heterojunction nano photocatalyst powder has perfect photocatalytic degradation efficiency on organic pollutants as well as good reusability.

Description

technical field [0001] The invention relates to a method for preparing BiOBr / ZnO nano photocatalyst powder. Background technique [0002] Photocatalytic reaction is a process in which semiconductor materials convert light energy into chemical energy under the irradiation of light to degrade compounds (organic substances, inorganic substances) through redox reactions. Photocatalysis has the advantages of no need to add additives and no by-products, which has become a research hotspot in the field of environment and energy. However, the following problems still exist in practical applications: low photon quantum efficiency and narrow spectral response range. Therefore, research and development of photocatalysts with low cost and high efficiency is an important development direction. [0003] At present, BiOBr, as a new type of p-type semiconductor photocatalyst, exhibits certain photocatalytic pollutant degradation ability due to its unique layered structure, and has a certa...

Claims

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Application Information

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IPC IPC(8): B01J27/138
Inventor 王雅文樊彩梅丁光月王韵芳谷红兵
Owner TAIYUAN UNIV OF TECH
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