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Preparation method and application of Bi-Bi2WO6 visible-light-induced photocatalyst

A visible light and catalyst technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc. Catalytic activity, enhancement of visible light absorption ability, effect of reducing the use of raw materials

Pending Publication Date: 2020-02-04
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For the currently prepared Bi 2 WO 6 When the catalyst photocatalytically degrades VOCs, its bandgap width is about 2.7eV, and it responds to visible light, but it can only absorb light below 450nm, and has technical problems such as fast electron-hole recombination rate. The invention provides a Bi-Bi 2 WO 6 Preparation method and application of visible light catalyst, the obtained catalyst has high photocatalytic efficiency and stability, and can be used for photocatalytic degradation of VOCs

Method used

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  • Preparation method and application of Bi-Bi2WO6 visible-light-induced photocatalyst
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  • Preparation method and application of Bi-Bi2WO6 visible-light-induced photocatalyst

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Embodiment 1

[0027] A Bi-Bi 2 WO 6 The preparation method of visible light catalyst comprises the following steps:

[0028] Step 1, dissolve 0.2g polyvinylpyrrolidone and 0.97g bismuth nitrate in 30ml, 1mol / L nitric acid solution and magnetically stir to obtain mixed solution A; dissolve 0.3298g sodium tungstate in 20ml distilled water, and under the action of magnetic stirring Slowly add the sodium tungstate solution dropwise into the mixed solution A, adjust the pH to 7, and keep stirring for 2 hours to obtain the mixed solution B;

[0029] Step 2, move the mixed solution B to a polytetrafluoroethylene-lined autoclave, set the hydrothermal temperature at 180°C, and the hydrothermal time for 24 hours. After the reaction is complete, transfer the product to a drying oven at 60°C for 12 hours to obtain a semi-finished product;

[0030] Step 3: Weigh 0.42g semi-finished product into a beaker, add 70-80ml ethylene glycol, stir magnetically for 3 hours, then transfer the product to a polytet...

Embodiment 2

[0032] A Bi-Bi 2 WO 6 The preparation method of visible light catalyst comprises the following steps:

[0033] Step 1, dissolve 0.2g polyvinylpyrrolidone and 0.97g bismuth nitrate in 30ml, 1mol / L nitric acid solution and magnetically stir to obtain mixed solution A; dissolve 0.3298g sodium tungstate in 20ml distilled water, and under the action of magnetic stirring Slowly add the sodium tungstate solution dropwise into the mixed solution A, adjust the pH to 7, and keep stirring for 2 hours to obtain the mixed solution B;

[0034] Step 2, move the mixed solution B to a polytetrafluoroethylene-lined autoclave, set the hydrothermal temperature at 180°C, and the hydrothermal time for 24 hours. After the reaction is complete, transfer the product to a drying oven at 60°C for 12 hours to obtain a semi-finished product;

[0035]Step 3: Weigh 0.42g semi-finished product into a beaker, add 70-80ml of ethylene glycol, stir magnetically for 3h, and then transfer the product to a polyte...

Embodiment 3

[0037] A Bi-Bi 2 WO 6 The preparation method of visible light catalyst comprises the following steps:

[0038] Step 1, dissolve 0.2g polyvinylpyrrolidone and 0.97g bismuth nitrate in 30ml, 1mol / L nitric acid solution and magnetically stir to obtain mixed solution A; dissolve 0.3298g sodium tungstate in 20ml distilled water, and under the action of magnetic stirring Slowly add the sodium tungstate solution dropwise into the mixed solution A, adjust the pH to 7, and keep stirring for 2 hours to obtain the mixed solution B;

[0039] Step 2, move the mixed solution B to a polytetrafluoroethylene-lined autoclave, set the hydrothermal temperature at 180°C, and the hydrothermal time for 24 hours. After the reaction is complete, transfer the product to a drying oven at 60°C for 12 hours to obtain a semi-finished product;

[0040] Step 3: Weigh 0.42g semi-finished product into a beaker, add 70-80ml of ethylene glycol, stir magnetically for 3 hours, then transfer the product to a poly...

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Abstract

The invention relates to a preparation method of a synthetic catalyst, and discloses a preparation method and an application of a Bi-Bi2WO6 visible-light-induced photocatalyst. The method comprises the following steps: 1, preparing a Bi2WO6 catalyst by utilizing a hydrothermal technology; and 2, preparing Bi / Bi2WO6 by a solvothermal technology. Bi metal reduced by adjusting the solvothermal temperature is researched, a traditional reducing agent is not added in the preparation of the Bi metal, the solvothermal reduction temperature is adjusted while ethylene glycol is added as a solvent and areducing agent, a Bi source is not added in the preparation process, and surface reduction is directly carried out on the prepared Bi2WO6. The catalyst has the advantages of large visible light absorption range and high electron-hole separation efficiency, has an obviously better capability in toluene degradation under visible light than pure Bi2WO6, and has the best toluene degradation effect at180 DEG C.

Description

technical field [0001] The invention belongs to the technical field of chemical industry catalysis, a kind of Bi-Bi 2 WO 6 Preparation method and application of visible light catalyst. Background technique [0002] In recent years, due to energy shortage and environmental pollution, the degradation of volatile organic compounds (VOCs) by semiconductor materials under visible light irradiation has attracted extensive attention. Therefore, it is urgent to design and synthesize more efficient visible light-responsive catalysts. Now, many visible light-responsive semiconductor photocatalytic materials have been used to deal with the degradation of pollutants, including g-C 3 N 4 , Ag 3 PO 4 , BiVO 4 , CdS, etc. Among them, Bi 2 WO 6 is a layered Aurivillius phase oxide semiconductor, which is defined by [WO 6 ] 2- and [Bi 2 o 2 ] 2+ Alternate layers. The layered structure can accelerate the separation of photogenerated electron-holes. Due to its unique propert...

Claims

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Application Information

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IPC IPC(8): B01J23/31B01D53/86B01D53/72B01D53/44
CPCB01J23/31B01D53/864B01D53/8687B01D2257/708B01J35/39
Inventor 许琦葛艳高佳朱瑜瑜
Owner YANCHENG INST OF TECH