A z-mechanism rich in oxygen vacancies bi 2 o 3 @ceo 2 Photocatalyst and its preparation method and application

A technology of photocatalyst and oxygen vacancies, applied in the field of photocatalysis, can solve the problems of low utilization rate, high photocatalyst photogenerated electron-hole recombination rate, etc., and achieve the effect of fast degradation rate, high catalytic degradation activity, and easy operation process

Inactive Publication Date: 2022-02-01
SHAANXI NORMAL UNIV
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  • Abstract
  • Description
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Problems solved by technology

However, β-Bi 2 o 3 Photocatalysts have a high photogenerated electron-hole recombination rate, resulting in a low utilization rate, which is not enough for better application in the field of photocatalysis

Method used

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  • A z-mechanism rich in oxygen vacancies bi <sub>2</sub> o <sub>3</sub> @ceo <sub>2</sub> Photocatalyst and its preparation method and application
  • A z-mechanism rich in oxygen vacancies bi <sub>2</sub> o <sub>3</sub> @ceo <sub>2</sub> Photocatalyst and its preparation method and application
  • A z-mechanism rich in oxygen vacancies bi <sub>2</sub> o <sub>3</sub> @ceo <sub>2</sub> Photocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Oxygen vacancy-rich Z-mechanism Bi 2 o 3 @CeO 2 The preparation method of photocatalyst, it comprises the steps:

[0033] 1) Preparation of reaction solution

[0034] a. Dissolve 2 g of cerium nitrate hexahydrate in 60 mL of deionized water to form a uniform solution, then add 0.8 g of acrylamide and 1.8 g of glucose and stir for 20 minutes to prepare a cerium nitrate solution;

[0035] b. Bi(NO 3 ) 3 ·5H 2 O was dissolved in ethylene glycol solution and stirred for 20 minutes until the solution was uniform to prepare bismuth nitrate solution;

[0036] 2) Slowly drop the bismuth nitrate solution prepared in step 2) into the cerium nitrate solution prepared in step 1) according to the atomic ratio of Ce:Bi=1:0.04 and stir for 20 minutes, and use a volume concentration of 5% ammonia The pH of the aqueous solution was adjusted to 10, stirred for another 3 hours, and then transferred into a stainless steel reaction kettle for hydrothermal reaction at 180° C. for 72 h...

Embodiment 2

[0042] Different from Example 1, the oxygen-vacancy-rich Z-mechanism Bi prepared in this example 2 o 3 @CeO 2 The preparation method of photocatalyst comprises the following steps:

[0043] 1) Preparation of reaction solution

[0044] a. Dissolve 2.5 g of cerium nitrate hexahydrate in 50 mL of deionized water to form a uniform solution, then add 1 g of acrylamide and 1.6 g of glucose and stir for 28 minutes to prepare a cerium nitrate solution;

[0045] b. Bi(NO 3 ) 3 ·5H 2 O was dissolved in ethylene glycol solution and stirred for 26 minutes until the solution was uniform to prepare bismuth nitrate solution;

[0046] 2) Slowly drop the bismuth nitrate solution prepared in step 2) into the cerium nitrate solution prepared in step 1) according to the atomic ratio of Ce:Bi=1:0.04 and stir for 26 minutes, and use ammonia with a volume concentration of 7% The pH of the aqueous solution was adjusted to 10, and then stirred for 2.5 hours, then transferred into a stainless st...

Embodiment 3

[0051] Different from Example 1 and Example 2, the oxygen-vacancy-rich Z-mechanism Bi prepared in this example 2 o 3 @CeO 2 The preparation method of photocatalyst comprises the following steps:

[0052] 1) Preparation of reaction solution

[0053] a. Dissolve 3 g of cerium nitrate hexahydrate in 60 mL of deionized water to form a uniform solution, then add 1.2 g of acrylamide and 2 g of glucose and stir for 30 minutes to prepare a cerium nitrate solution;

[0054] b. Bi(NO 3 ) 3 ·5H 2 O was dissolved in ethylene glycol solution and stirred for 30 minutes until the solution was uniform to prepare bismuth nitrate solution;

[0055] 2) Slowly drop the bismuth nitrate solution prepared in step 2) into the cerium nitrate solution prepared in step 1) according to the atomic ratio of Ce:Bi=1:0.05 and stir for 30 minutes, and use ammonia with a volume concentration of 5.5%. The pH of the aqueous solution was adjusted to 11, stirred for another 3 hours, and then transferred int...

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Abstract

The present invention proposes a Z-mechanism Bi that is rich in oxygen vacancies 2 o 3 @CeO 2 A photocatalyst and its preparation method and application belong to the field of photocatalysis technology, and the method includes 1) preparing a reaction liquid; 2) preparing a catalyst precursor body liquid; 3) N 2 Preparation of Intermediate Bi@CeO by High Temperature Calcination in a Protected Tube Furnace 2 ; 4) Preparation of Z-mechanism Bi rich in oxygen vacancies 2 o 3 @CeO 2 Photocatalyst; the catalyst is nanosheet-like Bi 2 o 3 CeO attached to the curd 2 The curd structure formed on the particle, the oxygen-vacancy-rich Z-mechanism Bi prepared by the method of the present invention 2 o 3 @CeO 2 Photocatalysts can be applied to degrade NOx in the air under visible light conditions, which not only have high degradation rate and long activity retention time, but also the intermediate product NO 2 The yield is small, and the products formed by degradation are low or non-toxic, and will not cause secondary pollution to the air.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, in particular to a Z-mechanism Bi that is rich in oxygen vacancies 2 o 3 @CeO 2 Photocatalyst and its preparation method and application. Background technique [0002] Atmospheric Pollutants SOx, Nox and CO 2 Degradation of phospholipids has always been a matter of concern to people, because they not only bring huge challenges to the environment, but also seriously endanger human health and pose a huge challenge to future economic development. Photocatalytic oxidation technology is one of the efficient and green ways to degrade pollutants, usually with TiO 2 ,CeO 2 , ZnO, WO 3 Such semiconductors are used as photocatalysts, but these photocatalysts have poor electrical conductivity and weak oxidation ability due to their weak photoresponsive ability and low carrier separation and transfer efficiency. [0003] CeO 2 As a traditional photocatalyst, because of its high efficiency, non...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/18B01D53/86B01D53/56B01J35/08B01J35/10
CPCB01J23/002B01J23/18B01J35/004B01D53/8628B01J35/023B01J35/08B01J35/1019
Inventor 孙辉聂俊丽朱刚强
Owner SHAANXI NORMAL UNIV
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