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Zinc tungstate/bismuth oxyiodide heterojunction visible light photocatalysis material and fabrication method thereof

A photocatalytic material, bismuth oxyiodide technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of high carrier recombination probability, poor light absorption, etc., and achieve simple process , low cost, suitable for large-scale production

Inactive Publication Date: 2013-04-03
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and aim at the problems of poor light absorption and high carrier recombination probability of zinc tungstate materials, and provide a high-efficiency zinc tungstate / bismuth iodide oxide based on zinc tungstate The heterojunction visible light photocatalytic material also provides a simple and easy method for preparing the material. This method is low in cost, easy to mass-produce, can significantly increase the separation probability of photogenerated carriers, and improve the photocatalytic performance of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Dissolve 0.219g of zinc acetate and 0.330g of sodium tungstate in 10ml of deionized water respectively, stir for 10 minutes, then add the sodium tungstate solution dropwise into the zinc acetate solution and continue stirring, use diluted 25wt%- 28wt% ammonia solution to adjust the pH value of the solution to 9.0. After stirring for 20 minutes, the mixed solution was transferred to a 25ml reaction kettle and reacted at 180°C for 12 hours. After cooling to room temperature naturally, the resulting product was collected, washed and dried to obtain zinc tungstate nanorods.

[0016] (2) Dissolve 0.166g of potassium iodide in 20ml of deionized water, add 0.485g of bismuth nitrate and continue stirring. Then add 0.314g zinc tungstate nanorods to the above mixed solution, the molar ratio of potassium iodide and zinc tungstate is 1:1, stir at room temperature for 0.5 hours, then heat in a water bath at 80°C for 2 hours. The obtained product was collected, washed and dried ...

Embodiment 2

[0019] (1) Dissolve 0.219g of zinc acetate and 0.330g of sodium tungstate in 10ml of deionized water respectively, stir for 10 minutes, then add the sodium tungstate solution dropwise into the zinc acetate solution and continue stirring, use diluted 25wt%- 28wt% ammonia solution to adjust the pH value of the solution to 9.0. After stirring for 20 minutes, the mixed solution was transferred to a 25ml reaction kettle and reacted at 180°C for 12 hours. After cooling to room temperature naturally, the resulting product was collected, washed and dried to obtain zinc tungstate nanorods.

[0020] (2) Dissolve 0.083g of potassium iodide in 20ml of deionized water, add 0.243g of bismuth nitrate and continue stirring. Then add 0.314g zinc tungstate nanorods to the above mixed solution, the molar ratio of potassium iodide and zinc tungstate is 1:2, stir at room temperature for 0.5 hours, then heat in a water bath at 80°C for 2 hours. The obtained product was collected, washed and dried ...

Embodiment 3

[0023] (1) Dissolve 0.219g of zinc acetate and 0.330g of sodium tungstate in 10ml of deionized water respectively, stir for 10 minutes, then add the sodium tungstate solution dropwise into the zinc acetate solution and continue stirring, use diluted 25wt%- 28wt% ammonia solution to adjust the pH value of the solution to 9.0. After stirring for 20 minutes, the mixed solution was transferred to a 25ml reaction kettle and reacted at 180°C for 12 hours. After cooling to room temperature naturally, the resulting product was collected, washed and dried to obtain zinc tungstate nanorods.

[0024] (2) Dissolve 0.055 g of potassium iodide in 20 ml of deionized water, add 0.162 g of bismuth nitrate and continue stirring. Then add 0.314g zinc tungstate nanorods to the above mixed solution, the molar ratio of potassium iodide and zinc tungstate is 1:3, stir at room temperature for 0.5 hours, then heat in a water bath at 80°C for 2 hours. The obtained product was collected, washed and dri...

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Abstract

The invention belongs to the field of new materials, and relates to a zinc tungstate / bismuth oxyiodide heterojunction visible light photocatalysis material and a fabrication method thereof. The photocatalysis material comprises zinc tungstate and bismuth oxyiodide, wherein the mol ratio of bismuth oxyiodide is 25%-50%. The fabrication method comprises the steps of dissolving zinc acetate and sodium wolframate in deionized water, adding a sodium tungstate solution into a zinc acetate solution to obtain a zinc tungstate nanorod, dissolving potassium iodide in the deionized water, adding bismuth nitrate, adding the prepared zinc tungstate nanorod into a mixed solution, and finally obtaining the zinc tungstate / bismuth oxyiodide heterojunction photocatalysis material. The method can be conducted at room temperature and under normal pressure, is low in cost, simple in process, and suitable for large-scale production, and has important potential application in industrial production. The prepared zinc tungstate / bismuth oxyiodide heterojunction photocatalysis material can better response to visible light, and shows an excellent visible light photocatalysis performance.

Description

technical field [0001] The invention belongs to the field of new materials, and relates to a zinc tungstate / bismuth iodide oxide heterojunction visible light photocatalytic material and a preparation method thereof. Background technique [0002] In recent years, photocatalysis has received widespread attention in environmental governance and energy development, and the research and development of photocatalytic materials is becoming a hot research topic at home and abroad. However, the practical application of photocatalysts is restricted by two factors: high recombination probability of photogenerated carriers and narrow spectral response range. Therefore, seeking visible light photocatalytic materials with high catalytic activity will be an inevitable trend for the further practical application of photocatalytic technology. [0003] As an important photocatalyst, zinc tungstate has shown good photocatalytic activity in photolysis of water and degradation of organic pollut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/138A62D3/17A62D101/26
Inventor 樊唯镏李盼赵兴邦程秀凤
Owner SHANDONG UNIV
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