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MnO2/Bi2WO6 heterojunction photocatalyst for removing nitrogen oxides and preparation method of MnO2/Bi2WO6 heterojunction photocatalyst

A nitrogen oxide and photocatalyst technology, applied in the field of MnO2/Bi2WO6 heterojunction photocatalyst and preparation, can solve the problem of insufficient photocatalytic performance of materials, and achieve the advantages of improved photocatalytic denitration activity, low production cost, and enhanced absorption range. Effect

Active Publication Date: 2021-05-28
SICHUAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the insufficient photocatalytic performance of a single Bi2WO6 material, the first purpose of the present invention is Provide a MnO2 / Bi2WO6 heterojunction photocatalyst for nitrogen oxide removal to broaden the Bi The photoresponse range of >2WO6 improves the photocatalytic performance of the catalyst; the second purpose of the present invention is to provide a method for preparing MnO2 / Bi 2WO6The method of heterojunction photocatalyst, the preparation method has the advantages of simple process, low cost, good operability, and environmental friendliness.

Method used

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  • MnO2/Bi2WO6 heterojunction photocatalyst for removing nitrogen oxides and preparation method of MnO2/Bi2WO6 heterojunction photocatalyst

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Effect test

Embodiment 1

[0034] Take 9.701g Bi(NO 3 )·5H 2 O and 3.299g Na 2 WO 3 2H 2 O was dissolved in 40mL deionized water respectively, stirred at room temperature for 30min, and then the two were mixed, and the pH value was adjusted to 1 with NaOH solution, and continued to stir for 1h, then transferred to a polytetrafluoroethylene reaction kettle, and heated at 150 The hydrothermal reaction was carried out at ℃ for 18 hours, and after natural cooling, it was taken out and centrifuged, and the obtained white precipitate was washed several times with deionized water and absolute ethanol, and dried overnight at 60 ℃ to obtain Bi 2 WO 6 powder.

Embodiment 2

[0036] Put a certain amount of KMnO4 into a crucible, place it in a muffle furnace, set the heating rate at 10°C / min, and calcinate at 350°C for 5 hours to obtain a black powder, which is washed several times with deionized water and dried get MnO 2 powder.

Embodiment 3

[0038] Take 1.1615g Bi 2 WO 6 The powder is evenly dispersed in 40mL ethylene glycol; take 0.3478g MnO 2 The powder was evenly dispersed in 40mL of ethylene glycol; after stirring for 30min respectively, the two were mixed, and the stirring was continued for 2h. Transfer the mixed solution to a polytetrafluoroethylene reactor, react at 160°C for 12 hours, take it out and centrifuge after natural cooling, wash the obtained precipitate with deionized water and absolute ethanol several times, and dry it overnight at 60°C to obtain Product 1, designated as 4-1M-BWO.

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Abstract

The invention discloses a MnO2 / Bi2WO6 heterojunction photocatalyst for removing nitrogen oxides and a preparation method of the MnO2 / Bi2WO6 heterojunction photocatalyst. The heterojunction photocatalyst is composed of Bi2WO6 and MnO2, MnO2 nanosheets wrap or are embedded on a spherical structure formed by stacking the Bi2WO6 nanosheets, and the molar ratio of the Bi2WO6 to the MnO2 is 1: (1-4). The preparation method comprises the following steps of uniformly dispersing MnO2 powder and Bi2WO6 powder in ethylene glycol respectively, mixing, putting into a reactor for hydrothermal reaction, and separating and drying after full reaction to obtain the heterojunction photocatalyst MnO2 / Bi2WO6. The prepared MnO2 / Bi2WO6 photocatalyst has high crystallinity, no other impurities are generated, the absorption range of visible light is widened through the formed heterojunction structure, and the photocatalyst has higher photocatalytic activity compared with single Bi2WO6.

Description

technical field [0001] The invention relates to the technical field of nitrogen oxide removal in air pollution control, in particular to a MnO used to remove low-concentration nitrogen oxides 2 / Bi 2 WO 6 Heterojunction photocatalyst and preparation method thereof. Background technique [0002] As a typical air pollutant, nitrogen oxides are the root cause of harsh environmental problems such as acid rain, smog, and ozone layer destruction. A variety of nitrogen oxide removal methods have been developed in the industry, among which the selective catalytic reduction method is a widely used technology, but this technology is not economical and applicable to deal with low concentrations of NO in the atmosphere. [0003] In addition to environmental pollution, the energy crisis is also one of the biggest problems facing mankind in the 21st century. Photocatalysis has become an ideal clean energy production technology due to its unique properties of deep reaction at room temp...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01D53/86B01D53/56
CPCB01J23/34B01D53/8628B01J35/39
Inventor 郭家秀景悅袁山东楚英豪李建军
Owner SICHUAN UNIV
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