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Synthesis and application method of BiOBr photocatalyst containing light-controlled oxygen vacancy

A photocatalyst and synthesis method technology, applied in the field of nanomaterials, can solve the problems of poor photocatalyst stability, single performance composition, etc., and achieve the effects of easy industrial production, cheap and easily available raw materials, and stable performance.

Active Publication Date: 2021-03-30
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the disadvantage of poor stability of the existing oxygen-vacancy (OVs) BiOBr photocatalyst, and provides a synthesis and application method of a BiOBr material containing photo-controlled oxygen vacancies. The purpose is to provide a simple, economical and environmentally friendly hydrolysis method, To prepare a new photocatalyst with strong performance and single composition, so as to achieve the full and effective use of solar energy and the effect of artificial photocatalytic reduction of nitrogen to synthesize ammonia

Method used

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  • Synthesis and application method of BiOBr photocatalyst containing light-controlled oxygen vacancy
  • Synthesis and application method of BiOBr photocatalyst containing light-controlled oxygen vacancy
  • Synthesis and application method of BiOBr photocatalyst containing light-controlled oxygen vacancy

Examples

Experimental program
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Effect test

Embodiment 1

[0031] 0.01molBi(NO 3 ) 3 ·5H 2 O was added to 50 mL diethylene glycol and stirred at room temperature for 1.5 h, and 0.01 mol NaBrO 3 Add it into 50mL of distilled water and stir at room temperature for 1.5h, mix the two solutions, and react continuously for 3h under this condition until a precipitate is formed, and finally separate, wash and dry the obtained precipitate to obtain the light-controlled oxygen The vacant BiOBr is denoted as BiOBr-OVs-A.

[0032] The obtained BiOBr nanomaterials containing photocontrolled oxygen vacancies were used for photocatalytic nitrogen fixation reaction. The reaction conditions are: normal temperature and pressure, the amount of catalyst used is 0.05 g, the amount of water used is 100 mL, the light source used is a xenon lamp, the power is 300 W, the illumination is 120klx, the distance from the reaction interface is 20 cm, and the wavelength of the emitted light is 200-800 nm simulated sunlight. Specific operation steps: First, diss...

Embodiment 2

[0034] 0.01mol Bi(NO 3 ) 3 ·5H 2 O was added to 50 mL diethylene glycol and stirred at room temperature for 2 h, and 0.01 mol NaBrO 3 Add it into 40mL distilled water and stir at room temperature for 2 hours, mix the two solutions, use a water bath to control the temperature at 4°C, and continue to react under this condition for 3 hours until a precipitate is formed, and finally the obtained precipitate is separated, washed and dried. The BiOBr containing photo-controlled oxygen vacancies can be obtained, which is denoted as BiOBr-OVs-B.

[0035]The obtained BiOBr nanomaterials containing photocontrolled oxygen vacancies were used for photocatalytic nitrogen fixation reaction. The reaction conditions are: normal temperature and pressure, the amount of catalyst used is 0.05 g, the amount of water used is 100 mL, the light source used is a xenon lamp, the power is 300 W, the illumination is 120klx, the distance from the reaction interface is 20 cm, and the wavelength of the e...

Embodiment 3

[0037] The BiOBr-OVs-A nanomaterial containing photo-controlled oxygen vacancies obtained in Example 1 was used in the photocatalytic nitrogen fixation cycle reaction to test its stability. The reaction conditions are: normal temperature and pressure, the amount of catalyst used is 0.05 g, the amount of water used is 100 mL, the light source used is a xenon lamp, the power is 300 W, the illuminance is 120 klx, the distance from the reaction interface is 20 cm, and the wavelength of the emitted light is 200-800 nm simulated sunlight. Specific operation steps: First, put the photocatalyst in water, ultrasonically dissolve it fully, and then pass nitrogen gas for 0.5 h under the condition of avoiding light, in order to completely exclude the air; then turn on the light source, conduct photocatalytic nitrogen fixation experiment, after 1 h of light, Test its nitrogen fixation activity, and then continue to test its activity after the recovery of the catalyst containing oxygen vaca...

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Abstract

The invention discloses a synthesis and application method of a BiOBr photocatalyst containing a light-controlled oxygen vacancy, belongs to the technical field of nano materials, and can overcome thedefect of poor stability of an existing BiOBr photocatalyst containing an oxygen vacancy (OVs). Bismuth nitrate pentahydrate and sodium bromate are used as raw materials, the reaction temperature isadjusted, and a BiOBr material containing a light-controlled oxygen vacancy is prepared by using a one-step hydrolysis method. In other words, under the illumination condition, the catalyst can removeoxygen atoms to generate oxygen vacancies, after the light source is removed, the catalyst can adsorb the oxygen atoms in water or air, the oxygen vacancies are restored, and when illumination is conducted again, the oxygen vacancies are generated again, so that the problems that the oxygen vacancies are prone to inactivation and the reaction efficiency is not high are solved. A new research thought is provided for designing an efficient and stable synthetic ammonia photocatalyst.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a synthesis and application method of a BiOBr photocatalyst containing light-controlled oxygen vacancies, which can be used for photocatalytic reduction of nitrogen to synthesize ammonia. Background technique [0002] As a chemical substance and energy carrier necessary for human production and life, ammonia has a huge demand. At present, the commonly used ammonia synthesis reaction in industry is the traditional Haber-Bosch method, which uses nitrogen and hydrogen to synthesize ammonia, but this technology requires high temperature and high pressure conditions (15-25 MPa, 300-550 ° C), and this process consumes the world's energy supply every year 1% to 2% of the carbon dioxide produced by the combustion of fossil fuels is equivalent to 2.3 tons of carbon dioxide. In the era when the two major problems of global fossil fuel shortage and climate warming a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06B01J35/00B01J37/03C01C1/02
CPCB01J27/06B01J37/031C01C1/026B01J35/39B01J35/23Y02P20/52
Inventor 张璐璐李瑞樊彩梅刘建新张小超张长明王雅文王韵芳
Owner TAIYUAN UNIV OF TECH
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