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Hydrothermal method for preparing superstructure visible light responsive Bi2WO6 photcatalyst

A photocatalyst and superstructure technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of large energy consumption, large size, and ineffective regulation problems such as product morphology and structure, to achieve the effect of low cost and simple operation

Inactive Publication Date: 2007-04-25
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The calcination process not only consumes a lot of energy, but also cannot effectively control the morphology, structure, orientation, etc. of the product, and the particle size of the prepared sample is too large, resulting in a greatly reduced specific surface area of ​​the catalyst.
Therefore, although visible light response can be achieved, its photocatalytic efficiency is not ideal.

Method used

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  • Hydrothermal method for preparing superstructure visible light responsive Bi2WO6 photcatalyst
  • Hydrothermal method for preparing superstructure visible light responsive Bi2WO6 photcatalyst

Examples

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Effect test

Embodiment 1

[0018] Bi 2 WO 6 The superstructure precursors were prepared using Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 (Analytical pure) is synthesized as raw material, according to stoichiometric ratio, weighs 0.97g Bi(NO 3 ) 3 ·5H 2 O (analytical grade) was dissolved in 50 mL of water, and then 0.33 g of Na 2 WO 4 (analytical pure), stir to form a white suspension precursor, adjust the pH value to 0.5-2.5. Then pour the white suspended precursor solution into the hydrothermal kettle for hydrothermal treatment. After comparative experiments, the filling capacity of the precursor in the hydrothermal kettle was selected as 80%, the temperature range of the hydrothermal reaction was 160°C, and the hydrothermal reaction time was 20h . After the reaction, the obtained yellow precipitate was filtered, washed three times with deionized water and absolute ethanol, and then dried at 80°C. As shown in Figure 1, through the XRD composition, the orthorhombic Bi 2 WO 6 superstructure. A in F...

Embodiment 2

[0022] Bi 2 WO 6 The superstructure precursors were prepared using Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 (Analytical pure) is synthetic as raw material, according to stoichiometric ratio, weighs 2mmol Bi(NO 3 ) 3 ·5H 2 O (analytical grade) was dissolved in 50 mL of water, and then 1 mmol Na 2 WO 4 (Analytical pure), stir to form a white suspension precursor solution, and adjust the pH value to 0.1-5. Then pour the white suspended precursor solution into the hydrothermal kettle for hydrothermal treatment. After comparative experiments, the filling capacity of the precursor in the hydrothermal kettle is selected as 80%, the temperature range of the hydrothermal reaction is 160°C, and the hydrothermal reaction time is 20h . After the reaction, the obtained yellow precipitate was filtered, washed three times with deionized water and absolute ethanol, dried at 80°C, and sintered at 550°C. As shown in Figure 1, after XRD composition analysis, the orthorhombic Bi is also obta...

Embodiment 3

[0024] Bi 2 WO 6 Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 (analytical pure) is synthesized as raw material, according to stoichiometric ratio, weighs 2mMol Bi(NO 3 ) 3 ·5H 2 O (analytical grade) was dissolved in 50 mL of water, and then 1 mMol Na was added 2 WO 4 (analytical pure), then add surfactant p123, stir to form a white suspension precursor solution, and adjust the pH value to 0.5-5. Then pour the white suspended precursor solution into the hydrothermal kettle for hydrothermal treatment. The filling capacity of the precursor in the hydrothermal kettle is selected as 60%, the temperature range of the hydrothermal reaction is 160°C, and the hydrothermal reaction time is 20h. After the reaction, the obtained yellow precipitate was filtered, washed three times with deionized water and absolute ethanol, and then dried at 80°C. In this example, Bi with a particle size of about 3 μm 2 WO 6 The superstructure is formed by the aggregation of nanorods with a length of 20nm...

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Abstract

The invention relates to a method for preparing Bi2WO6 optical catalyst which can respond visible light. Wherein, said method comprises that (1), preparing the forward body with Bi2WO6 structure at nanometer size that mixing the reactants or adding surface activator (P123, PVP, CTAB), mixing uniformly; (2), under 120-240Deg. C, reacting the forward body in water heating condition for 4-24h, eccentrically separating the product, washing and drying at 30-150Deg. C, to obtain the powder; then sintering the powder at 300-750Deg. C for 1-10h, to obtain the final catalyst. The invention has low cost, while the inventive catalyst high tens time degrade efficiency than TiO2 (P25).

Description

technical field [0001] The invention relates to the preparation of Bi with superstructure by hydrothermal method 2 WO 6 , the catalysts prepared by this method have superstructure and high visible light photocatalytic efficiency. Background technique [0002] Energy crisis and environmental problems are the most serious problems in this century, especially the environmental problems caused by toxic and refractory organic pollutants (such as halogenated substances, pesticides, dyes, etc.) have become major problems affecting human survival and health. The direct utilization of solar energy to degrade these organic pollutants through photocatalysis is the most friendly way to solve these two problems. This method does not use artificial energy and can completely mineralize organic pollutants without secondary pollution. It is a green environmental treatment technology with broad application prospects and has become one of the most active research directions. At present, the...

Claims

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Application Information

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IPC IPC(8): B01J23/31
Inventor 王文中张丽莎周林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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