Preparation method of WO3/Bi2WO6 composite heterojunction material for photocatalytic degradation of toluene

A composite heterojunction and photocatalysis technology, applied in the field of photocatalysis, can solve the problems of low separation efficiency of photogenerated electrons and holes, low toluene activity, low photocatalytic activity, etc., to enhance the utilization rate of light energy, and the preparation method. Simple, highly active effects

Pending Publication Date: 2022-08-02
法尔曼环保科技(苏州)有限公司 +1
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Problems solved by technology

[0004] The purpose of the invention is to solve the problem of pure Bi 2 WO 6 The problem of low photocatalytic degradation of toluene activity provides a WO 3 with Bi 2 WO 6 Composite formation of direct Z-type heterojunction catalyst preparation method to solve pure Bi 2 WO 6 The problem of low photogenerated electron and hole separation efficiency and low photocatalytic activity

Method used

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  • Preparation method of WO3/Bi2WO6 composite heterojunction material for photocatalytic degradation of toluene
  • Preparation method of WO3/Bi2WO6 composite heterojunction material for photocatalytic degradation of toluene
  • Preparation method of WO3/Bi2WO6 composite heterojunction material for photocatalytic degradation of toluene

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Embodiment 1

[0024] a WO 3 / Bi 2 WO 6 The preparation method of the catalyst, the preparation method specifically comprises the following steps:

[0025] (1) Weigh 12g of sodium tungstate (Na 2 WO 4 ·2H 2 O) was dissolved in 80 ml of deionized water, and after continuous magnetic stirring for 30 min, 80 ml of 8M hydrochloric acid solution was slowly added dropwise to form a yellow dispersion. Subsequently, the mixed system was transferred to a Teflon-lined stainless steel autoclave with a volume of 200 ml. The autoclave was sealed and placed in an oven at 100 °C for 24 h. The obtained yellow substance was washed with deionized water and absolute ethanol for three times and centrifuged, dried at 80 °C for 12 h, and then calcined at 400 °C for 4 h to obtain WO 3 powder.

[0026] (2) 1 mmol Na 2 WO 4 ·2H 2 O was dissolved in 120 mL of deionized water and stirred for 30 min to obtain solution A, and 2 mmol of bismuth nitrate (Bi(NO 3 ) 3 ·5H 2 O) was dissolved in 10 mL of glacial...

Embodiment 2

[0028] a WO3 / Bi 2 WO 6 The preparation method of the catalyst, the preparation method specifically comprises the following steps:

[0029] (1): Weigh 12g of sodium tungstate (Na 2 WO 4 ·2H 2 O) was dissolved in 80 ml of deionized water, and after continuous magnetic stirring for 30 min, 80 ml of 8M hydrochloric acid solution was slowly added dropwise to form a yellow dispersion. Finally, the mixed system was transferred to a Teflon-lined stainless steel autoclave with an inner volume of 200 ml. The autoclave was sealed and placed in an oven at 100°C for 24 hours. The obtained yellow substance was washed with deionized water and absolute ethanol for three times and centrifuged, dried at 80 °C for 12 h, and then calcined at 400 °C for 4 h to obtain WO 3 powder.

[0030] (2): 1 mmol Na 2 WO 4 ·2H 2 O was dissolved in 120 mL of deionized water and stirred for 30 min to obtain solution A, and 2 mmol of bismuth nitrate (Bi(NO 3 ) 3 ·5H 2 O) was dissolved in 10 mL of gl...

Embodiment 3

[0032] a WO 3 / Bi 2 WO 6 The preparation method of the catalyst, the preparation method specifically comprises the following steps:

[0033] (1): Weigh 12g of sodium tungstate (Na 2 WO 4 ·2H 2 O) was dissolved in 80 ml of deionized water, and after continuous magnetic stirring for 30 min, 80 ml of 8M hydrochloric acid solution was slowly added dropwise to form a yellow dispersion. Finally, the mixed system was transferred to a Teflon-lined stainless steel autoclave with an inner volume of 200 ml. The autoclave was sealed and placed in an oven at 100°C for 24 hours. The obtained yellow substance was washed with deionized water and absolute ethanol for three times and centrifuged, dried at 80 °C for 12 h, and then calcined at 400 °C for 4 h to obtain WO 3 powder.

[0034] (2): 1 mmol Na 2 WO 4 ·2H 2 O was dissolved in 120 mL of deionized water and stirred for 30 min to obtain solution A, and 2 mmol of bismuth nitrate (Bi(NO 3 ) 3 ·5H 2 O) was dissolved in 10 mL of ...

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Abstract

The invention discloses a preparation method of a WO3 / Bi2WO6 composite heterojunction material for photocatalytic degradation of toluene, and belongs to the technical field of photocatalysis. The preparation method comprises the following steps: firstly, taking sodium tungstate and hydrochloric acid as raw materials, and preparing WO3 through the steps of hydrothermal reaction, washing, drying, high-temperature calcination and the like; uniformly mixing a sodium tungstate solution dissolved in deionized water and a bismuth nitrate solution dissolved in acetic acid, and adding the previously prepared WO3; the WO3 / Bi2WO6 heterojunction catalyst is prepared by carrying out ultrasonic treatment and solvothermal reaction on the mixed system, centrifuging, washing and drying. The prepared WO3 / Bi2WO6 catalyst has a matched energy band structure, a direct Z-type heterojunction can be formed, the WO3 / Bi2WO6 catalyst inhibits rapid recombination of electrons and holes under the condition of visible light, effective separation of the electrons and the holes is achieved, and meanwhile the maximum oxidation-reduction capacity of an original catalyst is reserved. The WO3 / Bi2WO6 prepared by the invention is applied to the field of photocatalysis of toluene for the first time, the activity of photocatalysis of toluene is high, and the removal rate of toluene within 60 minutes can reach 91%.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and specifically relates to a WO 3 / Bi 2 WO 6 Preparation method of visible light catalyst and its application in photocatalytic degradation of toluene. Background technique [0002] As a common air pollutant, volatile organic pollutants (VOCs) are ubiquitous in the environment and have complex components. The main components include aromatics and their derivatives, alkanes, alkenes, halogenated hydrocarbons, alcohols, esters, aldehydes, Ketones, etc., have small molecular weight, low boiling point, and are volatile at room temperature and pressure. They are one of the important factors in the formation of photochemical smog and haze. They are highly irritating, genotoxic and carcinogenic, and can cause health problems to humans and animals. threaten. As a typical VOCs, toluene is widely produced in daily production and life. A large amount of toluene will be produced in the process of...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01D53/72B01D53/86
CPCB01J23/30B01J23/002B01D53/8668B01D2257/708B01J35/39Y02A50/20
Inventor 郭丽娜简捷张旭吴胜华王如意贾勇
Owner 法尔曼环保科技(苏州)有限公司
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