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Bismuth oxide photocatalyst containing bismuth defects in different crystal phases and preparation method thereof

A technology of photocatalyst and bismuth oxide, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc. Electron migration efficiency, hindering the application of photocatalytic technology and other issues, to achieve the effect of improving the utilization rate of visible light, low economic cost of production, and broadening the response range of visible light

Active Publication Date: 2021-06-01
CHONGQING TECH & BUSINESS UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the bismuth-based photocatalysts prepared by the prior art have low light quantum conversion efficiency, narrow photoresponse range, and low utilization rate of solar energy (visible light), which hinder the application of photocatalytic technology.
The bismuth-based photocatalysts prepared in the prior art cannot build a defect intermediate energy level between the valence band and the conduction band, and cannot change the excitation path of the photo-generated electrons from the valence band to the conduction band transition, and thus cannot promote the improvement of the migration efficiency of the photo-generated electrons.

Method used

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  • Bismuth oxide photocatalyst containing bismuth defects in different crystal phases and preparation method thereof
  • Bismuth oxide photocatalyst containing bismuth defects in different crystal phases and preparation method thereof
  • Bismuth oxide photocatalyst containing bismuth defects in different crystal phases and preparation method thereof

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preparation example Construction

[0055] see figure 1 , is a flow chart of the method for preparing a monoclinic bismuth oxide photocatalyst containing bismuth defects provided in the examples of the present application. A method for preparing a bismuth oxide photocatalyst containing bismuth defects in a monoclinic phase, the preparation method comprising:

[0056] Step S101, dissolving bismuth nitrate pentahydrate in dilute nitric acid solution, then adding cetyl ammonium bromide, and obtaining the bismuth nitrate pentahydrate, the dilute nitric acid solution and the cetyl ammonium bromide after magnetic stirring Ammonium mixture solution;

[0057] Step S102, adding the sodium hydroxide solution into the mixture solution of the bismuth nitrate pentahydrate, the dilute nitric acid solution and the cetyl ammonium bromide, stirring, performing ultrasonic centrifugal washing, and then performing drying treatment, drying Carry out heat treatment in muffle furnace after treatment, obtain light yellow sample;

[...

Embodiment 1

[0105] 1) Get the 20ml dilute nitric acid solution that 0.2g bismuth nitrate pentahydrate dissolves, then add 0.1g cetyl ammonium bromide, obtain bismuth nitrate pentahydrate, dilute nitric acid solution and cetyl ammonium bromide after magnetic stirring for 20min mixture solution;

[0106] 2) Mix 200ml (2mol·L -1 ) Sodium hydroxide solution is added to the mixture solution of bismuth nitrate pentahydrate, dilute nitric acid solution and cetyl ammonium bromide, after stirring for 30min, ultrasonic centrifugal washing is carried out, and then drying treatment is carried out in a muffle furnace after drying treatment. Heat treatment to obtain a light yellow sample;

[0107] 3) Weigh 0.5g of light yellow sample and 0.5g of polyvinylpyrrolidone into a 100ml beaker filled with 50ml of deionized water, stir magnetically at room temperature to obtain a white mixture solution;

[0108] 4) Add 15ml of sodium borohydride (50mmol) solution dropwise to the white mixture solution, magnet...

Embodiment 2

[0113] 1) Get the 20ml dilute nitric acid solution that 0.2g bismuth nitrate pentahydrate dissolves, then add 0.1g cetyl ammonium bromide, obtain bismuth nitrate pentahydrate, dilute nitric acid solution and cetyl ammonium bromide after magnetic stirring for 20min mixture solution;

[0114] 2) Mix 200ml (2mol·L -1 ) Sodium hydroxide solution is added to the mixture solution of bismuth nitrate pentahydrate, dilute nitric acid solution and cetyl ammonium bromide, after stirring for 30min, ultrasonic centrifugal washing is carried out, and then drying treatment is carried out in a muffle furnace after drying treatment. Heat treatment to obtain pure monoclinic bismuth oxide photocatalyst (α-Bi 2 o 3 ).

[0115] The pure monoclinic bismuth oxide photocatalyst (α-Bi 2 o 3 ) and the degradation test process of NO are the same as in Example 1. Calculate the pure monoclinic bismuth oxide photocatalyst (α-Bi 2 o 3 ) to NO degradation rate of 15%.

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Abstract

The present application discloses a bismuth oxide photocatalyst containing bismuth defects in different crystalline phases and a preparation method thereof. The bismuth oxide photocatalyst containing bismuth defects in different crystalline phases is prepared by the preparation method. Due to the formation of bismuth defects, it can be A defect intermediate energy level is constructed between the valence band and the conduction band of the photocatalyst, which changes the excitation and transport path of photogenerated electrons, promotes the migration and conversion of photogenerated charges, and then inhibits the recombination of photogenerated electron-hole pairs. Na Bi 3+ Revert to Bi 0 , so that it has the surface plasmon resonance (SPR) effect, which promotes the improvement of the migration efficiency of photogenerated electrons. At the same time, the prepared bismuth oxide photocatalyst with different crystal phases containing bismuth defects also broadens its visible light response range. For the bismuth oxide photocatalyst, the band edge of the bismuth oxide photocatalyst with different crystal phases containing bismuth defects prepared by the present application shows a red shift, shows enhanced visible light absorption, and improves the utilization rate of visible light.

Description

technical field [0001] The present application relates to the field of photocatalysts, in particular to a bismuth oxide photocatalyst containing bismuth defects in different crystal phases and a preparation method thereof. Background technique [0002] With the advancement of human science and technology civilization, the industry has developed on a large scale, and automobiles have become more and more popular, and a large amount of nitrogen oxides have been discharged into the atmosphere. Nitrogen oxides are pollutants of photochemical smog, acid rain, and ozone layer destruction. Nitrogen oxides have become air pollutants that need to be solved urgently in countries all over the world. Visible light-driven photocatalyst method, as an environmentally friendly green technology, has shown good application prospects in environmental pollution purification and solar energy conversion. Visible light-driven photocatalyst method can make nitrogen oxides oxidize under the action ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/18B01J35/00C01G29/00B01D53/86B01D53/56
CPCB01D53/8628C01G29/00B01J23/18C01P2004/04C01P2004/03B01D2255/2096B01J35/39
Inventor 董帆雷奔李宇涵王红
Owner CHONGQING TECH & BUSINESS UNIV
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