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Modified BiOBr nanosheet as well as preparation method and application thereof

A nanosheet and modification technology, applied in the field of modified BiOBr nanosheets and their preparation, can solve the problems of poor dopant stoichiometric control and insufficient practical application, and achieve improved photoreduction performance, simple method, and stability. high effect

Active Publication Date: 2021-11-30
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, due to the "self-cleaning" effect, the stoichiometry of dopants is poorly controlled
Although the above method can also improve BiOBr to CO to a certain extent 2 conversion efficiency, but it is far from enough for practical applications

Method used

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  • Modified BiOBr nanosheet as well as preparation method and application thereof
  • Modified BiOBr nanosheet as well as preparation method and application thereof
  • Modified BiOBr nanosheet as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Step 1, 0.5g Bi(NO 3 ) 3 ·5H 2 0 and 0.5g CTAB (cetyltrimethylammonium bromide) were added into 30mL ultrapure water and stirred for 10min to obtain a mixed solution, and 6M NaOH aqueous solution was added to the mixed solution to adjust the pH=9 of the mixed solution, followed by vigorous stirring for 1h, and Transfer to a stainless steel autoclave at 170 °C for 15 h, high-speed centrifugation to obtain the precipitate, wash with water and ethanol three times, and dry in a vacuum oven at 60 °C for 24 h to obtain BiOBr nanosheets, labeled as pure BiOBr.

[0044] Step 2, take 100mg pure BiOBr and 48mg Co(NO 3 ) 2 ·6H 2 O was added to 100mL ultrapure water and 150W power was ultrasonicated for 30min, then stirred in a constant temperature heating magnetic stirrer at 80°C for 24h, and the precipitate was obtained by high-speed centrifugation, washed with water three times, and dried in a vacuum oven at 60°C for 24h to obtain the modified BiOBr Nanosheets, labeled Co-B...

Embodiment 2

[0060] Same as Example 1, the only difference is that in step 2 Co(NO 3 ) 2 ·6H 2 O was added in an amount of 24 mg.

[0061] The modified BiOBr nanosheets were obtained, labeled as Co-BiOBr-0.25, and the molar ratio of Co and Bi was 1:18.

Embodiment 3

[0063] Same as Example 1, the only difference is that in step 2 Co(NO 3 ) 2 ·6H 2 O was added in an amount of 96 mg.

[0064] The modified BiOBr nanosheets were obtained, labeled as Co-BiOBr-1, and the molar ratio of Co and Bi was 1:41.

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Abstract

The invention discloses a modified BiOBr nanosheet as well as a preparation method and application thereof, and belongs to the technical field of photocatalysts. The modified BiOBr nanosheet is modified by replacing part of Bi<3+> on the surface of BiOBr with Co<2+>. The Co<2+> modified pure BiOBr nanosheet is adopted, so that the photo-reduction performance of BiOBr is remarkably improved, the optical phase response range of the BiOBr nanosheet is widened while the original structure of the BiOBr nanosheet is reserved, and the electronic structure is adjusted. The rate of the prepared modified BiOBr nanosheet (Co-BiOBr) for catalytic reduction of CO2 to generate CO reaches 11.71 [mu]mol*g<-1>*h<-1>, the modified BiOBr nanosheet is still maintained at a high catalytic reduction level after four cycles of 12 hours, the properties of the modified BiOBr nanosheet are not changed, and the modified BiOBr nanosheet is high in stability.

Description

technical field [0001] The invention relates to the technical field of photocatalysts, in particular to a modified BiOBr nanosheet and its preparation method and application. Background technique [0002] As the process of industrialization continues to accelerate, the energy crisis caused by the excessive use of fossil energy and the greenhouse effect caused by excessive emissions are threatening human development step by step. Use clean and gentle technology to remove CO 2 Conversion to chemicals of higher economic value such as CO has received great attention in recent years. [0003] The photocatalytic reaction is generally carried out under mild conditions at ambient temperature and atmospheric pressure. The reaction power comes from the easily available and inexhaustible sunlight, and the photocatalytic reaction is used to reduce CO 2 It is an in-situ conversion reaction of carbon dioxide that does not involve electricity, does not form secondary pollution, and is an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06C01B32/40B01D53/62B01D53/86
CPCB01J27/06B01D53/86B01D53/62C01B32/40B01D2257/504B01J35/39
Inventor 谢宇周义鹏凌云刘杰段宇晨
Owner NANCHANG HANGKONG UNIVERSITY
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