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Cubic crystal phase bismuthyl carbonate photocatalyst with carbonate defect and preparation method thereof

A technology of bismuth oxycarbonate and photocatalyst, which is applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of inability to promote the migration efficiency of photogenerated electrons and the inability to change the excitation path of photogenerated electron transitions, and achieve production The economic cost is low, the promotion of migration and transformation, and the effect of improving the removal rate

Inactive Publication Date: 2018-11-09
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pure-phase bismuth oxycarbonate photocatalyst prepared by 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 photogenerated electrons from the valence band to the conduction band transition, and thus cannot promote the transfer efficiency of photogenerated electrons improvement

Method used

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  • Cubic crystal phase bismuthyl carbonate photocatalyst with carbonate defect and preparation method thereof
  • Cubic crystal phase bismuthyl carbonate photocatalyst with carbonate defect and preparation method thereof
  • Cubic crystal phase bismuthyl carbonate photocatalyst with carbonate defect and preparation method thereof

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preparation example Construction

[0054] figure 1 A preparation method of a tetragonal phase bismuth oxycarbonate photocatalyst containing carbonate defects shown in the embodiment of the present application, the preparation method comprises:

[0055] S101, adding nitric acid to deionized water to obtain a dilute nitric acid solution;

[0056] S102, adding bismuth nitrate pentahydrate into the dilute nitric acid solution, stirring until the bismuth nitrate pentahydrate is dissolved, and then adding concentrated ammonia water to obtain a turbid milky white solution;

[0057] S103, passing carbon dioxide into the turbid milky white solution, and obtaining a white precipitate after standing for precipitation;

[0058] S104, the white precipitate is subjected to centrifugal washing and then dried to obtain a pure tetragonal bismuth oxycarbonate photocatalyst;

[0059] S105, adding a stabilizer to deionized water, then adding the pure tetragonal bismuth oxycarbonate photocatalyst, and magnetically stirring to obt...

Embodiment 1

[0091] 1) Add 6.25ml of nitric acid (14.4mol / l) into a 250ml beaker containing 100mL of deionized water to obtain a 0.9mol / L dilute nitric acid solution;

[0092] 2) Add 1.21 g of bismuth nitrate pentahydrate into the dilute nitric acid solution, stir at room temperature for 30 minutes until the bismuth nitrate pentahydrate dissolves, then add 15 mL of concentrated ammonia water and stir for 5 min to obtain a turbid milky white solution;

[0093] 3) Introduce carbon dioxide with a flow rate of 1L / min into the turbid milky white solution, maintain it for 30 minutes, and obtain a white precipitate after standing for precipitation;

[0094] 4) The white precipitate was washed with ethanol and deionized water twice before and after each, and then dried in an oven at 40° C. to obtain a pure tetragonal bismuth oxycarbonate photocatalyst.

[0095] The pure tetragonal bismuth oxycarbonate photocatalyst prepared in the examples of this application was characterized by XRD, SEM, TEM, HR...

Embodiment 2

[0098] 1) Add 6.25ml of nitric acid (14.4mol / l) into a 250ml beaker containing 100mL of deionized water to obtain a 0.9mol / L dilute nitric acid solution;

[0099] 2) Add 1.21 g of bismuth nitrate pentahydrate into the dilute nitric acid solution, stir at room temperature for 30 minutes until the bismuth nitrate pentahydrate dissolves, then add 15 mL of concentrated ammonia water and stir for 5 min to obtain a turbid milky white solution;

[0100] 3) Introduce carbon dioxide with a flow rate of 1L / min into the turbid milky white solution, maintain it for 30 minutes, and obtain a white precipitate after standing for precipitation;

[0101] 4) washing the white precipitate with ethanol and deionized water twice before and after each, and then drying in an oven at 40°C to obtain a pure tetragonal bismuth oxycarbonate photocatalyst;

[0102] 5) Add 1g of polyvinylpyrrolidone into a 250ml beaker containing 100mL of deionized water, then add 2mmol of pure tetragonal bismuth oxycarbon...

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Abstract

The application discloses a cubic crystal phase bismuthyl carbonate photocatalyst with carbonate defects and a preparation method thereof, wherein the cubic crystal phase bismuthyl carbonate photocatalyst containing carbonate defects prepared by the preparation method forms a defect intermediate energy level between a valence band and a conduction band of the cubic crystal phase bismuthyl carbonate photocatalyst through the construction of the carbonate defects, changes the excitation transmission path of light-generated electrons, promotes the migration and conversion of light-generated charges, and inhibits the recombination of light-generated electron-hole pairs. At the same time, the range of visible light response is also widened, the utilization rate of visible light is improved, andthe removal rate of NO is improved. In addition, the cubic crystal phase bismuthyl carbonate photocatalyst containing carbonate defects prepared by the preparation method provided by the invention iseconomically efficient with a low production cost.

Description

technical field [0001] The present application relates to the field of catalysts, in particular to a tetragonal bismuth oxycarbonate photocatalyst containing carbonate defects 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 photocatalysis, as an environmentally friendly green technology, has shown good application prospects in both environmental pollution purification and solar energy conversion. The photocatalytic method driven by visible light can oxidize nitrogen oxides under the action of photocat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/20B01D53/86B01D53/56
CPCB01D53/8628B01J27/20B01D2255/802B01D2255/2096B01J35/39
Inventor 董帆陈鹏雷奔孙明禄
Owner CHONGQING TECH & BUSINESS UNIV
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