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Visible light response method for preparing Bi2WO6 photocatalyst fused salt

A photocatalyst and visible light technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Energy and equipment requirements are high, and the effect of low cost, low energy consumption and simple process is achieved

Inactive Publication Date: 2008-09-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-temperature solid-state reaction method not only consumes a lot of energy, but also cannot effectively control the morphology and structure of the product.
However, the hydrothermal method has high requirements on equipment, and it needs to be carried out under a certain pressure, and the process is also relatively complicated.

Method used

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  • Visible light response method for preparing Bi2WO6 photocatalyst fused salt
  • Visible light response method for preparing Bi2WO6 photocatalyst fused salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) take by weighing 40.2g lithium nitrate and the sodium nitrate of 34.24g, mix as reaction medium after;

[0018] 2) According to the weight ratio of reaction medium and oxide raw material 20:1, weigh 2.56g of bismuth oxide and 1.16g of tungsten oxide;

[0019] 3) The reaction medium and the oxide raw material with a weight ratio of 20:1 are added with absolute ethanol, mixed evenly, put into an oven, and dried at 80°C;

[0020] 3) Put the obtained mixture of the reaction medium and the oxide raw material into an alumina crucible, put it into a resistance furnace, raise the temperature to 350° C. at a rate of 3° C. / min, and keep it warm for 8 hours to obtain a solid reaction product;

[0021] 4) The obtained solid reaction product was dissolved in hot water, filtered, washed to remove free compounds, and dried at 80°C to obtain visible light-responsive Bi 2 WO 6 catalyst of light. Such as figure 1 , after XRD analysis, it can be seen that the orthorhombic Bi 2 WO ...

Embodiment 2

[0025] 1) take by weighing 40.2g lithium nitrate and the sodium nitrate of 34.24g, mix as reaction medium after;

[0026] 2) According to the weight ratio of reaction medium and oxide raw material 5:1, weigh 1.28g of bismuth oxide and 0.58g of tungsten oxide;

[0027] 3) The reaction medium and the oxide raw material with a weight ratio of 5:1 are added with absolute ethanol, mixed evenly, put into an oven, and dried at 80°C;

[0028] 3) Put the obtained mixture of the reaction medium and the oxide raw material into an alumina crucible, put it into a resistance furnace, raise the temperature to 350° C. at a rate of 3° C. / min, and keep it warm for 8 hours to obtain a solid reaction product;

[0029] 4) The obtained solid reaction product was dissolved in hot water, filtered, washed to remove free compounds, and dried at 80°C to obtain orthorhombic Bi 2 WO 6 catalyst of light. The experimental result of methyl orange degradation by visible light with wavelength λ>400nm is sli...

Embodiment 3

[0031] 1) take by weighing 40.2g lithium nitrate and the sodium nitrate of 34.24g, mix as reaction medium after;

[0032] 2) According to the weight ratio of reaction medium and oxide raw material 20:1, weigh 2.56g of bismuth oxide and 1.16g of tungsten oxide;

[0033] 3) The reaction medium and the oxide raw material with a weight ratio of 20:1 are added with absolute ethanol, mixed evenly, put into an oven, and dried at 80°C;

[0034] 3) Put the obtained mixture of the reaction medium and the oxide raw material into an alumina crucible, put it into a resistance furnace, raise the temperature to 500° C. at a rate of 5° C. / min, and keep it warm for 2 hours to obtain a solid reaction product;

[0035] 4) The obtained solid reaction product was dissolved in hot water, filtered, washed to remove free compounds, and dried at 80°C to obtain orthorhombic Bi 2 WO 6 catalyst of light. The experimental result of methyl orange degradation by visible light with wavelength λ>400nm is s...

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Abstract

The invention discloses a preparation method of fused salt of a visible light response Bi2WO6 photocatalyst. The method comprises the steps of (1) mixing lithium nitrate and sodium nitrate at a weight ratio of 27:23 as a reaction medium; (2) mixing the reaction medium and an oxide raw material at a weight ratio of (5-30):1, adding anhydrous alcohol, mixing, and oven-drying at 50-80 DEG C; (3) charging into an aluminum oxide crucible, placing a resistance furnace, heating to 200-500 DEG C at a speed of 2-5 DEG C / min, and keeping the temperature for 2-8 hours to obtain a solid reaction product; and (3) dissolving in hot water, filtering, washing, removing free compounds, and drying at 50-80 DEG C to obtain visible light response Bi2WO6 photocatalyst. The inventive method has the advantages of low synthesis temperature, short period, no need of any templates and surfactants as auxiliary materials, simple steps and equipment, low cost, easily controlled process conditions, and adaptability to industrial production.

Description

technical field [0001] The invention relates to a visible light responsive Bi 2 WO 6 Photocatalytic molten salt preparation method, Bi prepared by this method 2 WO 6 Photocatalysts have high visible light photocatalytic efficiency. Background technique [0002] Bi 2 WO 6 It is a semiconductor photocatalyst, its energy level difference is about 2.75ev, and it can completely initiate photocatalytic reaction under the radiation of visible light. Bi 2 WO 6 It is the simplest Aurivillius-type oxide with a layered structure containing WO 6 Layers of perovskite structure. Thanks Bi 2 WO 6 It has properties such as dielectric, luminescence, ion conductor, and catalysis, and is widely used in related fields. [0003] Current Bi 2 WO 6 The methods used in the preparation of photocatalysts are: high-temperature solid-phase reaction method and hydrothermal method. The high-temperature solid-state reaction method not only consumes a large amount of energy, but also cannot ...

Claims

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Application Information

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IPC IPC(8): C01G41/00C01G29/00B01J23/31
Inventor 王智宇高春梅樊先平钱国栋
Owner ZHEJIANG UNIV
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