Method for preparing bismuth hydroxide/bismuth tungstate compound photo-catalyst by heating one-pot solvent

A solvothermal method and composite light technology, which are applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., to achieve the effect of simple and economical preparation process and easy to scale up production.

Inactive Publication Date: 2014-12-17
TIANJIN NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although Bi2WO6 is more efficient than traditional photocatalyst TiO2 Solar energy, but limited by its intrinsic absorption threshold (460nm), pure bismuth tungstate photocatalyst still has the following bottleneck problems that limit its practical application; one is the narrow absorption range of visible light, and the other is the recombination rate of photogenerated carriers faster

Method used

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  • Method for preparing bismuth hydroxide/bismuth tungstate compound photo-catalyst by heating one-pot solvent
  • Method for preparing bismuth hydroxide/bismuth tungstate compound photo-catalyst by heating one-pot solvent
  • Method for preparing bismuth hydroxide/bismuth tungstate compound photo-catalyst by heating one-pot solvent

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Embodiment 1

[0040] Weigh 0.40mmol Na 2 WO 4 2H 2 O, add 3.0ml distilled water and stir until fully dissolved; weigh 0.84mmol Bi(NO 3 ) 3 ·5H 2 O in a 25ml polytetrafluoroethylene reactor lining, add 5ml distilled water and magnetically stir for 15min, Na 2 WO 4 2H 2 The O solution was added dropwise into the reaction kettle, and magnetic stirring was continued for 30 min, then 9.0 ml of absolute ethanol was added dropwise, and after stirring for 10 min, the suspension was solvothermally reacted at 200° C. for 6 h. After cooling to room temperature, the product was centrifuged, washed and dried to obtain Bi(OH) 3 / Bi 2 WO 6 -0.1 photocatalyst sample. By adjusting Bi(NO 3 ) 3 ·5H 2 The amount of O, repeat the above operation, can get different compound ratio of Bi(OH) 3 / Bi 2 WO 6 Composite photocatalyst, performance as attached image 3 Described. As explained above, Bi(OH) 3 It is a product, not a reactant, but an excess of Bi(NO 3 ) 3 ·5H 2 O, and Bi(OH) was obtaine...

Embodiment 2

[0042] Weigh 0.40mmol Na 2 WO 4 2H 2 O, add 3ml of distilled water and stir until fully dissolved; weigh 0.92mmol Bi(NO 3 ) 3 ·5H 2 O in the polytetrafluoroethylene reactor liner of 25ml, add 11ml distilled water and magnetically stir for 15min, Na 2 WO 4 2H 2The O solution was added dropwise into the reaction kettle, continued magnetic stirring for 30 min, added dropwise 3.0 ml of absolute ethanol, stirred for 10 min, and reacted the white suspension at 180° C. for 6 h by solvothermal reaction. After being cooled to room temperature, the product was centrifuged, washed and dried to obtain an alcohol-water volume ratio of 3:14, Bi(OH) 3 / Bi 2 WO 6 -0.3 Pale yellow photocatalyst powder. By adjusting the ethanol content and repeating the above operation, a series of Bi(OH) with different ethanol content can be obtained. 3 Bi(OH) with a molar ratio of 0.3 3 / Bi 2 WO 6 composite photocatalyst.

[0043] Table 1 Bi(OH) 3 / Bi 2 WO 6 -0.3, the photocatalytic perform...

Embodiment 3

[0047] Weigh 0.40mmol Na 2 WO 4 2H 2 O, add 3ml of distilled water and stir until fully dissolved; weigh 0.88mmol Bi(NO 3 ) 3 ·5H 2 O in the polytetrafluoroethylene reactor liner of 25ml, add 5ml distilled water and magnetically stir for 15min, Na 2 WO 4 2H 2 The O solution was added dropwise into the reaction kettle, and magnetic stirring was continued for 30 minutes, then 9ml of absolute ethanol was added dropwise, and after stirring for 10 minutes, the white suspension was solvothermally reacted at 160°C for 12 hours. After cooling to room temperature, the product was centrifuged, washed and dried, and Bi(OH) with a molar ratio of 0.2 3 / Bi 2 WO 6 Photocatalyst samples. By setting the temperature at 160°C, 180°C, 200°C, and adjusting the Bi(NO 3 ) 3 ·5H 2 The amount of O, repeat the above operation, you can get a series of Bi(OH) with different molar ratios under different reaction temperature conditions 3 / Bi 2 WO 6 composite photocatalyst.

[0048] Table ...

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Abstract

The invention discloses a method for preparing a bismuth hydroxide / bismuth tungstate compound photo-catalyst by heating an one-pot solvent. A novel Bi(OH)3 / Bi2WO6 visible responsive photo-catalyst is prepared by taking ethanol and water as a mixed solvent, heating the one-pot solvent, and only excessively using and dissolving one bismuth source Bi (NO3)3.5H2O. The photocatalytic activity of the product is systematically researched under the impact of ethanol content, reaction temperature and time, Bi(OH)3 compound content and other experiment parameters, and the optimal conditions for preparing Bi (OH)3) / Bi2WO6 include alcohol-water volume ratio of 9 : 8, solvent hot temperature of 200 degrees centigrade, reaction time of 6 hours, and Bi (OH)3) compound mole ratio of 0.3. The preparation method has the characteristics of simpleness, low cost and energy saving, the prepared compound photo-catalyst has the excellent photocatalytic performance, thereby solving the problem that the present pure bismuth tungstate is relatively weak in catalytic performance and restricted in actual application.

Description

[0001] This application is supported by Tianjin Higher Education Innovation Team Training Program (TD12-5038). technical field [0002] The invention belongs to the technical field of environmental protection, and relates to a method for preparing a high-performance photocatalyst, in particular to a method for preparing bismuth hydroxide / bismuth tungstate Bi(OH) by using a one-pot solvothermal method 3 / Bi 2 WO 6 Method for composite photocatalysts. Background technique [0003] Environmental pollution and energy shortage are two major problems facing human beings in the 21st century. Due to its deep oxidation, no secondary pollution, and the ability to directly use solar energy as a light source to drive reactions, photocatalytic oxidation technology has shown great application prospects in environmental pollution control, and has therefore become one of the research hotspots in recent years. The development of highly efficient sunlight-responsive photocatalysts has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/31C02F1/30
CPCY02W10/37
Inventor 张国英崔燕杨立民
Owner TIANJIN NORMAL UNIVERSITY
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