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Preparation method of Bi2WO6 nano-spheres

A technology of nanospheres and solutions, applied in the field of preparation of Bi2WO6 nanospheres, which can solve problems such as increased valence band potential and narrowed forbidden band width, and achieves the effects of easy control, low cost and stable product quality

Inactive Publication Date: 2017-09-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bi 2 WO 6 The 5d orbital of the W atom forms the conduction band, the 6s of the Bi atom and the 2p hybrid orbital of the atom form the valence band, and the two form the Bi 2 WO 6 Due to the hybridization of Bi 6s orbital and O 2p orbital, the valence band potential increases and the forbidden band width narrows

Method used

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  • Preparation method of Bi2WO6 nano-spheres
  • Preparation method of Bi2WO6 nano-spheres
  • Preparation method of Bi2WO6 nano-spheres

Examples

Experimental program
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Embodiment 1

[0032] 1) Dissolve 1.5mmol sodium tungstate dihydrate in 15ml deionized water, so that the molar concentration of sodium tungstate dihydrate solution is 0.10mol / L;

[0033] 2) 3mmol bismuth nitrate pentahydrate was dissolved in 15ml deionized water, so that the molar concentration of bismuth nitrate pentahydrate solution was 0.20mol / L, and 0.10mmol tetramethylammonium hydroxide was dissolved in 10ml deionized water;

[0034] Then add the bismuth nitrate pentahydrate solution dropwise to the sodium tungstate solution at a rate of 1-2 drops / second, and add the tetramethylammonium hydroxide solution dropwise to the above mixed solution at the same rate, and stir for 30 minutes Afterwards, heat treatment was carried out at 180° C. for 12 hours. Then, after cooling down to room temperature, the reaction product was taken out, filtered, washed with dilute acetic acid, deionized water and ethanol in turn, and dried at 60°C to obtain Bi 2 WO 6 nanospheres.

Embodiment 2

[0036] 1) Dissolve 3mmol sodium tungstate dihydrate in 15ml deionized water, so that the molar concentration of sodium tungstate dihydrate solution is 0.20mol / L;

[0037] 2) 6mmol bismuth nitrate pentahydrate was dissolved in 15ml deionized water, so that the molar concentration of bismuth nitrate pentahydrate solution was 0.40mol / L, and 0.25mmol tetramethylammonium hydroxide was dissolved in 10ml deionized water;

[0038] Then add the bismuth nitrate pentahydrate solution dropwise to the sodium tungstate solution at a rate of 1-2 drops / second, and add the tetramethylammonium hydroxide solution dropwise to the above mixed solution at the same rate, and stir for 30 minutes After that, heat treatment was performed by keeping the temperature at 200° C. for 20 hours. Then, after cooling down to room temperature, the reaction product was taken out, filtered, washed with dilute acetic acid, deionized water and ethanol in turn, and dried at 60°C to obtain Bi 2 WO6 nanospheres.

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Embodiment 3

[0041] 1) Dissolve 4.5mmol sodium tungstate dihydrate in 15ml deionized water, so that the molar concentration of sodium tungstate dihydrate solution is 0.30mol / L;

[0042] 2) 9mmol bismuth nitrate pentahydrate was dissolved in 15ml deionized water, so that the molar concentration of bismuth nitrate pentahydrate solution was 0.60mol / L, and then 0.5mmol tetramethylammonium hydroxide was dissolved in 10ml deionized water;

[0043] Add the bismuth nitrate pentahydrate solution dropwise to the sodium tungstate solution at a rate of 1-2 drops / second, and add the tetramethylammonium hydroxide solution dropwise to the above mixed solution at the same rate, and stir for 30 minutes , Heat treatment at 250°C for 32 hours. Then, after cooling down to room temperature, the reaction product was taken out, filtered, washed with dilute acetic acid, deionized water and ethanol in turn, and dried at 60°C to obtain Bi 2 WO 6 nanospheres.

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Abstract

The present invention relates to a preparation method of Bi2WO6 nano-spheres. The preparation method comprises: 1) adding a bismuth nitrate solution into a sodium tungstate solution in a dropwise manner, wherein the molar concentration of the bismuth nitrate solution is 0.20-0.60 mol / L, and the molar concentration of the sodium tungstate solution is 0.10-0.30 mol / L; and 2) continuously adding a tetramethylammonium hydroxide solution in a dropwise manner, carrying out a hydrothermal reaction, filtering, and washing to obtain the Bi2WO6 nano-spheres, wherein the molar concentration of the tetramethylammonium hydroxide solution is 0.01-0.05 mol / L. According to the present invention, the preparation process is simple, the morphology of the self-assembled structure is easy to control, and the size is uniform.

Description

technical field [0001] The present invention relates to Bi 2 WO 6 The synthetic field of, specifically relate to a kind of Bi 2 WO 6 Preparation methods of nanospheres. Background technique [0002] Recent studies have found that the properties of nanomaterials are not only affected by their size, but also greatly affected by their morphology. Therefore, the preparation of nanostructures has attracted great attention. Not only have a large number of reports on the morphology of zero-dimensional nanoparticles, one-dimensional nanorods, nanofibers, and three-dimensional dendrites, but also prepared many self-assembled mesoporous spheres, nano tube etc. [0003] Bi 2 WO 6 by (Bi 2 o 2 ) 2+ layer and WO 6 A layered structure composed of alternating layers of perovskite sheets. Bi 2 WO 6 The 5d orbital of the W atom forms the conduction band, the 6s of the Bi atom and the 2p hybrid orbital of the atom form the valence band, and the two form the Bi 2 WO 6 Due to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00B01J23/31
CPCC01G41/00B01J23/31C01P2002/72C01P2004/20C01P2004/32C01P2004/03C01P2004/50C01P2004/51C01P2004/64C01P2004/61B01J35/51B01J35/40B01J35/39
Inventor 徐刚皇甫统帅孙小磊沈鸽韩高荣
Owner ZHEJIANG UNIV
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