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Method for preparing porous loose wool-ball-shaped bismuth tungstate powder photochemical catalyst with microwave-hydrothermal method

The technology of agglomerated bismuth tungstate and microwave hydrothermal is applied in chemical instruments and methods, physical/chemical process catalysts, inorganic chemistry, etc. Simple installation, good for diffuse reflection

Inactive Publication Date: 2012-07-18
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional semiconductor photocatalysts such as titanium dioxide (TiO 2 ) energy band is high, and the utilization rate of sunlight is not high

Method used

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  • Method for preparing porous loose wool-ball-shaped bismuth tungstate powder photochemical catalyst with microwave-hydrothermal method
  • Method for preparing porous loose wool-ball-shaped bismuth tungstate powder photochemical catalyst with microwave-hydrothermal method
  • Method for preparing porous loose wool-ball-shaped bismuth tungstate powder photochemical catalyst with microwave-hydrothermal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 O was put into a beaker, and an appropriate amount of deionized water was added to the beaker to make Bi(NO 3 ) 3 ·5H 2 O concentration is 0.05mol / L, Na 2 WO 4 2H 2 O concentration is 0.025mol / L;

[0031] Step 2: adjust the pH to 1.6, stir magnetically at room temperature for 1 hour to mix the raw materials evenly, and obtain a precursor solution for microwave hydrothermal reaction;

[0032] Step 3: Put the precursor solution obtained in step 2 into a polytetrafluoroethylene-lined reactor, then put the reactor into a microwave hydrothermal reactor MDS-8, set the power to 300W, and set the temperature at 180°C Stop reaction after reacting for 60mins;

[0033] Step 4: After the reaction temperature drops to room temperature, take out the precipitate in the reaction kettle; wash the precipitate with water and absolute ethanol until neutral; dry it at 80°C for 10 hours, and obtain the porous and loose fluffy b...

Embodiment 2

[0035] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 O was put into a beaker, and an appropriate amount of deionized water was added to the beaker, in which Bi(NO 3 ) 3 ·5H 2 O concentration is 0.12mol / L, Na 2 WO 4 2H 2 O concentration is 0.06mol / L;

[0036] Step 2: adjust the pH to 2.2, stir magnetically at room temperature for 1 hour to mix the raw materials evenly, and obtain a precursor solution for microwave hydrothermal reaction;

[0037] Step 3: Put the precursor solution obtained in step 2 into a polytetrafluoroethylene-lined reactor, then put the reactor into a microwave hydrothermal reactor MDS-8, set the power to 300W, and set the temperature at 160°C Stop the reaction after reacting for 50mins;

[0038] Step 4: After the reaction temperature drops to room temperature, take out the precipitate in the reaction kettle; wash the precipitate with water and absolute ethanol until neutral; dry it at 80°C for 10 hours, and obtain the porous and loose flu...

Embodiment 3

[0040]Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 O was put into a beaker, and an appropriate amount of deionized water was added to the beaker, in which Bi(NO 3 ) 3 ·5H 2 O concentration is 0.2mol / L, Na 2 WO 4 2H 2 O concentration is 0.1mol / L;

[0041] Step 2: adjust the pH to 3, stir magnetically at room temperature for 2 hours to mix the raw materials evenly, and obtain a precursor solution for microwave hydrothermal reaction;

[0042] Step 3: Put the precursor solution obtained in step 2 into a polytetrafluoroethylene-lined reactor, then put the reactor into a microwave hydrothermal reactor MDS-8, set the power at 500W, and set the temperature at 200°C Stop the reaction after reacting for 90mins;

[0043] Step 4: After the reaction temperature drops to room temperature, take out the precipitate in the reaction kettle; wash the precipitate with water and absolute ethanol until neutral; dry it at 80°C for 10 hours, and obtain the porous and loose fluffy ...

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Abstract

The invention provides a method for preparing a porous loose wool-ball-shaped bismuth tungstate powder photochemical catalyst with a microwave-hydrothermal method, which includes the following steps: bismuth nitrate pentahydrate serves as a bismuth (Bi) source and sodium tungstate dihydrate serves as a tungsten (W) source; bismuth nitrate pentahydrate and sodium tungstate dihydrate are dissolved in deionized water according to molar ratio of Bi:W=2:1; potential of hydrogen (pH) is adjusted to be 1.5-3, the raw materials are evenly mixed for 1 to 2 hours at room temperature in a magnetic mixing mode to obtain precursor solution of microwave-hydrothermal reaction; the precursor solution is transferred to a reaction kettle, the microwave-hydrothermal method is adopted for reaction at 160 to 200 DEG C for 30 to 90 minutes; finally the reaction kettle is taken out, and the precipitate is collected, cleaned and dried. The method requires low reaction temperature and short reaction time, the reaction temperature is approximately 180 DEG C, the reaction time is approximately 50 to 60 minutes, prepared powder has special appearance and is in the shape of a layering porous loose wool ball formed by thin sheets, and the method is high in photocatalytic activity, low in energy consumption and friendly to the environment.

Description

technical field [0001] The invention belongs to the field of functional materials, and relates to a microwave hydrothermal method for preparing a porous and loose wool-like bismuth tungstate powder photocatalyst. Background technique [0002] Using photocatalytic technology, organic pollutants can be oxidized and decomposed into inorganic substances. The reaction system converts the absorbed light energy into chemical energy under photocatalysis, so that many reactions that are usually difficult to achieve can be carried out smoothly under relatively mild conditions. Although its complex reaction mechanism has not yet been understood clearly, the research on application has made great achievements, showing the good application prospect of photocatalysis in the field of organic pollutant treatment. [0003] Photocatalysis is one of the unique properties of nanosemiconductors. Traditional semiconductor photocatalysts such as titanium dioxide (TiO 2 ) The energy band is relat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/31B01J35/10B01J20/06B01J20/28
Inventor 谈国强宋丽花
Owner SHAANXI UNIV OF SCI & TECH
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