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Preparation method of Bi4O5Br2 self-assembled hollow flower-like sphere and application of same in aspect of photocatalytic reduction of CO2

A bi4o5br2, self-assembly technology, applied in the direction of physical/chemical process catalysts, carbon monoxide, chemical instruments and methods, etc., can solve problems such as high cost, time-consuming and laborious

Pending Publication Date: 2020-09-25
NANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Microemulsion method and sacrificial template method are commonly used methods to synthesize hollow microspheres, but these methods are often costly, time-consuming and laborious, which limits its practical application

Method used

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  • Preparation method of Bi4O5Br2 self-assembled hollow flower-like sphere and application of same in aspect of photocatalytic reduction of CO2
  • Preparation method of Bi4O5Br2 self-assembled hollow flower-like sphere and application of same in aspect of photocatalytic reduction of CO2
  • Preparation method of Bi4O5Br2 self-assembled hollow flower-like sphere and application of same in aspect of photocatalytic reduction of CO2

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Embodiment 1

[0024] A kind of Bi of the present invention 4 o 5 Br 2 The preparation method embodiment 1 of self-assembled hollow curd, its steps are:

[0025] Weigh 1.5 mmol of Bi(NO 3 ) 3 ·5H 2 O was dissolved in 10 ml of ethylene glycol, 1 mmol of KBr was dissolved in 30 ml of ethanol, and after continuous magnetic stirring and ultrasonic dispersion for 0.5 h, the Bi(NO 3 ) 3 ·5H 2KBr solution was added to the O solution, and the mixture was transferred to a 50 ml polytetrafluoroethylene-lined stainless steel kettle, and reacted at a temperature of 180 °C for 16 h. After the reaction, the product was collected by centrifugation, washed three times with deionized water and absolute ethanol to remove residual ions, and finally collected to obtain the hollow curd Bi 4 o 5 Br 2 .

[0026] Weigh 1 mmol of Bi(NO 3 ) 3 ·5H 2 O was dissolved in 10 ml of ethylene glycol, 1 mmol of KBr was dissolved in 30 ml of ethanol, and after continuous magnetic stirring and ultrasonic dispersio...

Embodiment 2

[0027] A kind of Bi of the present invention 4 o 5 Br 2 The preparation method embodiment 2 of self-assembled hollow curd, its steps are:

[0028] Weigh 1.2 mmol of Bi(NO 3 ) 3 ·5H 2 O was dissolved in 12 ml of ethylene glycol, and 0.8 mmol of KBr was dissolved in 28 ml of ethanol. After continuous magnetic stirring and ultrasonic dispersion for 0.5 h, the Bi(NO 3 ) 3 ·5H 2 KBr solution was added to the O solution, and the mixture was transferred to a 50 ml polytetrafluoroethylene-lined stainless steel kettle, and reacted at 180 °C for 18 h. After the reaction was completed, the product was collected by centrifugation, washed three times with deionized water and absolute ethanol to remove residual ions, and finally collected to obtain the hollow curd Bi 4 o 5 Br 2 .

[0029] Weigh 0.8 mmol of Bi(NO 3 ) 3 ·5H 2 O was dissolved in 12 ml of ethylene glycol, and 0.8 mmol of KBr was dissolved in 28 ml of ethanol. After continuous magnetic stirring and ultrasonic dispe...

Embodiment 3

[0030] A kind of Bi of the present invention 4 o 5 Br 2 The preparation method embodiment 3 of self-assembled hollow curd, its steps are:

[0031] Weigh 1 mmol of Bi(NO 3 ) 3 ·5H 2 O was dissolved in 8 ml of ethylene glycol, 0.7 mmol of KBr was dissolved in 32 ml of ethanol, and after continuous magnetic stirring and ultrasonic dispersion for 0.8 h, the Bi(NO 3 ) 3 ·5H 2 KBr solution was added to the O solution, and the mixture was transferred to a 50 ml polytetrafluoroethylene-lined stainless steel kettle, and reacted at 170 °C for 18 h. After the reaction was completed, the product was collected by centrifugation, washed three times with deionized water and absolute ethanol to remove residual ions, and finally collected to obtain the hollow curd Bi 4 o 5 Br 2 .

[0032] Weigh 0.5 mmol of Bi(NO 3 ) 3 ·5H 2 O was dissolved in 8 ml of ethylene glycol, and 0.5 mmol of KBr was dissolved in 32 ml of ethanol. After continuous magnetic stirring and ultrasonic dispersio...

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Abstract

The invention provides a preparation method of a Bi4O5Br2 self-assembled hollow flower-like sphere, which comprises the following steps: by using ethylene glycol and ethanol as solvents, bismuth nitrate pentahydrate as a bismuth source and potassium bromide as a bromine source, keeping the reactants in a hydrothermal reaction kettle for a certain time at a certain temperature to obtain the Bi4O5Br2 self-assembled hollow flower-like sphere. According to the preparation method, the bismuth-rich Bi4O5Br2 hollow flower-like sphere with novel appearance is prepared by adjusting the ratio of reaction raw materials by utilizing a simple solvothermal method; the bismuth enrichment strategy improves the position of the bottom of the conduction band, so that Bi4O5Br2 has stronger reducing capacity,and meanwhile, due to the hybridization of Br 4p and O 2p, the energy band of Bi4O5Br2 is more discrete, thereby promoting charge transfer in the photocatalysis process. By means of the hollow structure, unique characteristics of large specific surface area, multiple active sites, enhanced light absorption and carrier separation efficiency and the like are realized in Bi4O5Br2; and due to the unique structure and composition characteristics of the hollow flower-like sphere Bi4O5Br2, the hollow flower-like sphere Bi4O5Br2 has higher photocatalytic CO2 reduction activity than BiOBr and solid Bi4O5Br2 under irradiation of sunlight.

Description

technical field [0001] The present invention relates to the preparation of chemical substance, be specifically related to a kind of Bi 4 o 5 Br 2 The preparation method of self-assembled hollow curd, the present invention also relates to Bi 4 o 5 Br 2 photocatalytic reduction of CO 2 aspects of application. Background technique [0002] Energy is the basis for human survival and social development. Nowadays, traditional fossil energy is still in a dominant position in the energy structure, but due to the limited and non-renewable nature of fossil energy, the world will face the problem of resource depletion in the near future. Therefore, the development and utilization of new energy has become a research hotspot. Among them, solar energy has its inexhaustible characteristics and has become the focus of research, and photocatalytic technology is to convert semiconductor photocatalytic materials into chemical energy and electrical energy by using solar energy under lig...

Claims

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Application Information

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IPC IPC(8): B01J27/06B01J35/10B01J35/08C01B32/40
CPCB01J27/06C01B32/40B01J35/39B01J35/51B01J35/61
Inventor 金晓丽徐怡雪葛腾谢海泉
Owner NANYANG NORMAL UNIV
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