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Hydrothermal method for preparing nano crystal Bi2WO6 powder photocatalytic material with visible light activity

A photocatalytic material and visible light technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as lack of homogeneity and decrease in specific surface area

Inactive Publication Date: 2005-12-21
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such catalysts are generally prepared by high-temperature solid-state reaction methods. However, the samples prepared by high-temperature solid-state reaction methods not only lack homogeneity, but also cause a large decrease in specific surface area, which is a fatal shortcoming of solid-state reaction methods.

Method used

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  • Hydrothermal method for preparing nano crystal Bi2WO6 powder photocatalytic material with visible light activity
  • Hydrothermal method for preparing nano crystal Bi2WO6 powder photocatalytic material with visible light activity
  • Hydrothermal method for preparing nano crystal Bi2WO6 powder photocatalytic material with visible light activity

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Preparation of Nanocrystalline Bi by Hydrothermal Method 2 WO 6 The method of powder photocatalyst is as follows: first weigh 9.8g Na 2 WO 4 ·2H 2Dissolve O in 150ml distilled water and stir constantly; then weigh 7.2g Bi(NO 3 ) 3 ·5H 2 O was added to the above solution, stirring constantly. After stirring for about 15 minutes, the above reaction solution was put into a 200 ml reactor, and hydrothermally treated at 150° C. for 24 hours. Take out the reaction kettle, after the reaction kettle is cooled to room temperature, separate the precipitate, wash the obtained precipitate repeatedly with distilled water until it is neutral, and finally vacuum dry at 80°C to obtain Bi 2 WO 6 powder. Bi to be obtained 2 WO 6 The powder was heat treated at 500°C for 2h. So you get nano crystal Bi 2 WO 6 catalyst of light. This sample showed the best photocatalytic activity, and its visible light photocatalytic degradation rate reached 68.7%.

Embodiment 2

[0028] In order to examine the effect of hydrothermal treatment temperature on nanocrystalline Bi 2 WO 6 The effect of the photocatalyst's catalytic activity, except for the difference in hydrothermal temperature, other reaction conditions such as the concentration of reactants, the amount of solvent water, the hydrothermal time, and the heat treatment temperature are exactly the same as in Example 1. It was found that when the hydrothermal treatment temperature was 100, 150, and 180°C, the visible light photocatalytic degradation rates were 13.7%, 68.7%, and 69.7%, respectively. The reason may be that when the hydrothermal temperature is too low, the reaction is incomplete, the yield is low, there are many impurities, and the photocatalytic activity is weak; when the hydrothermal temperature rises to 150°C, the nanocrystalline Bi 2 WO 6 The photocatalyst exhibits good photocatalytic activity; when the temperature is further increased, the photocatalytic activity of the sample doe...

Embodiment 3

[0030] In order to test the hydrothermal time for nanocrystal Bi 2 WO 6 The effect of the photocatalyst's catalytic activity, except for the difference in hydrothermal time, other reaction conditions such as the concentration of reactants, the amount of solvent water, the hydrothermal temperature, and the heat treatment temperature are all the same as in Example 1. It was found that when the hydrothermal treatment time was 10, 20, 24, and 40, the visible light photocatalytic degradation rates were 23.5%, 56.9%, 68.7%, and 70.2%, respectively. The reason may be that when the hydrothermal time is too short, the reaction is incomplete, the yield is low, there are many impurities, and the photocatalytic activity is weak; when the hydrothermal time is 24 hours, the nanocrystalline Bi 2 WO 6 The photocatalyst showed good photocatalytic activity; however, when the hydrothermal time was further extended, the photocatalytic activity of the sample did not increase significantly. Therefore, ...

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Abstract

The invention proposes a kind of hydrothermal method used for preparing light catalyzing material with visible light active nano crystal Bi2WO6 powder. The method makes bismuth nitrate and sodium tungstate as raw materials, prepare them into mixed solution, then add into reacting kettle and have hydrothermal treatment for 10 - 48 hours at 100 - 200 Deg. C, take out reacting kettle, after the system cooled to room temperature, repeatedly wash the got output to neutral with deionized water, then dry in vacuum condition, finally through 100 -1000 heat treatment for 0.5 -10 hours, we can obtain light catalyzing material with visible light active nanometer crystal Bi2WO6 powder. The method has such advantages as low synthesizing temperature, large specific surface area of obtained simples and small grains. The prepared material can not only show light catalyzing activeness in ultraviolet, but also show light catalyzing activeness in visible light bound as sunlight or indoor lamplight.

Description

Technical field [0001] The invention relates to a nanocrystalline Bi with large specific surface area, small particle size and high visible light activity 2 WO 6 The preparation method of the powder photocatalytic material, the present invention also relates to the technical field of preparing visible light photocatalytic active photocatalyst at low temperature. technical background [0002] Since 1972 Fujishima and Honda published on TiO in Nature magazine 2 Since the paper on photocatalytic water splitting on electrodes, photocatalytic technology has received widespread attention in environmental governance and energy development. The research and development of high-activity photocatalytic materials has gradually become a hot spot of research at home and abroad. However, most of the photocatalysts reported now have low efficiency and wide band gaps, which can only show photocatalytic activity in the ultraviolet region. In the solar spectrum, ultraviolet light (below 400nm) is ...

Claims

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Application Information

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IPC IPC(8): B01J23/31
Inventor 余家国熊建锋程蓓
Owner WUHAN UNIV OF TECH
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