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Preparation method of nitrogen doped loaded Bi203/Si02 light catalyst

A photocatalyst and supported technology, which is applied in the field of preparation of nitrogen-doped supported Bi2O3/SiO2 photocatalysts, which can solve the problems of easy agglomeration, inability to fully demonstrate the catalytic ability, and reduce the visible light catalytic activity of the catalyst.

Inactive Publication Date: 2015-05-13
NINGBO DIYANG ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent literature with application number 201210113063.9 reported a rare earth metal doped modified Bi 2 o 3 Preparation of photocatalyst, the catalyst has a good removal effect on organic pollutants, but studies have confirmed that the thermal stability of the catalyst doped with metal ions is poor, and it is easy to become the recombination center of the carrier, which reduces the visible light catalytic activity of the catalyst , so Bi 2 o 3 Catalytic ability cannot be fully demonstrated
[0004] In addition, Bi 2 o 3 As a photocatalyst, there are many problems in practical applications, such as poor adsorption capacity, easy agglomeration, difficulty in recycling after reaction, etc., while Bi 2 o 3 The fixation and regeneration of the

Method used

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  • Preparation method of nitrogen doped loaded Bi203/Si02 light catalyst
  • Preparation method of nitrogen doped loaded Bi203/Si02 light catalyst
  • Preparation method of nitrogen doped loaded Bi203/Si02 light catalyst

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preparation example Construction

[0029] The embodiment of the invention discloses a nitrogen-doped load type Bi 2 O 3 / SiO 2 The preparation method of the photocatalyst includes the following steps: step a) the macroporous SiO 2 Put it in bismuth nitrate solution, keep it warm at 70~90℃ after soaking, then airtight NH at 55~60℃ 3 ·H 2 React in O atmosphere, soak in dilute ammonia water after being placed to obtain intermediate product, namely Bi(OH) 3 / SiO 2 Visible light catalyst; step b) CO(NH 2 ) 2 Placed in bismuth nitrate solution to obtain a mixed solution, the mixed solution is added dropwise to the intermediate product, the NH sealed at 55-60 ℃ 3 ·H 2 React in O atmosphere, soak in dilute ammonia water, wash, dry and calcinate at high temperature to obtain nitrogen-doped supported Bi 2 O 3 / SiO 2 catalyst of light.

[0030] As a preferred solution, the macroporous SiO 2 Prepare according to the following method: mix epoxy resin, polyethylene glycol 1000 and polyethylene glycol 2000, and then add the curing ...

Embodiment 1

[0050] Add 20g Bi(NO 3 ) 3 ·5H 2 O was dissolved in 25g ethylene glycol to prepare a high-concentration solution, 25g acetonitrile diluent was added, and the prepared macroporous SiO 2 The carrier is placed in the solution and taken out after being fully immersed to obtain the reaction product and the first mixed solution respectively; the reaction product is kept at 80°C for 2h, and then placed in a closed NH 3 ·H 2 React at 60°C for 2h in O atmosphere. Take out the sample and place it at room temperature for 1 hour, and then soak it in 1M dilute ammonia water for 1.5 hours to fully carry out the hydrolysis and obtain the intermediate product;

[0051] Then take 2.48g of urea and dissolve it in the first mixed solution, control the molar ratio of N to Bi to 1.0 to obtain a second mixed solution, and add the second mixed solution dropwise to the intermediate product with a rubber tip dropper. Until the absorption is sufficient, then in the airtight NH 3 ·H 2 React at 55°C for 1.5h...

Embodiment 2

[0053] 25g Bi(NO 3 ) 3 ·5H 2 O was dissolved in 30g ethylene glycol to prepare a high-concentration solution, 25g acetonitrile diluent was added, and the prepared macroporous SiO 2 The carrier is placed in the solution and taken out after being fully immersed to obtain the reaction product and the first mixed solution respectively; the reaction product is kept at 80°C for 2h, and then placed in a closed NH 3 ·H 2 React at 60°C for 2h in O atmosphere. Take out the sample and place it at room temperature for 1 hour, and then soak it in 1 mol / L dilute ammonia water for 1.5 hours to fully carry out the hydrolysis and obtain the intermediate product;

[0054] Then take 6.19g of urea and dissolve it in the first mixed solution, control the molar ratio of N to Bi to 2.0, add the mixed solution dropwise to the above intermediate product with a rubber tip dropper until the absorption is sufficient, and then seal it NH 3 ·H 2 React at 55°C for 2h in O atmosphere. Take out the sample and pl...

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Abstract

The invention provides a preparation method of a nitrogen doped loaded Bi2O3 / SiO2 light catalyst. Macroporous SiO2 serves as a carrier, and Bi2O3 is uniformly loaded in pore passages of SiO2 to form a Bi2O3 / SiO2 composite macroporous material, and then the nitrogen doped Bi2O3 / SiO2 visible light catalyst is prepared by a precipitation method. According to the method, macroporous SiO2 serves as the carrier, comprises a nano thin layer bent and extending three-dimensionally as a three-dimensional macroporous material, produces a capillary effect, achieves nanoscale dispersion of an absorbed substance and realizes more uniform and stable load of nitrogen and Bi2O3 to achieve efficient catalysis and recycling of the catalyst; and on the other hand, the SiO2 carrier serves as a catalyst and improves visible light catalysis capability of a material to a certain extent. Therefore, the nitrogen doped loaded Bi2O3 / SiO2 light catalyst prepared with the method has good visible light catalysis capability and absorption capability.

Description

Technical field [0001] The invention relates to the technical field of photocatalysts, in particular to a nitrogen-doped supported Bi 2 O 3 / SiO 2 Preparation method of photocatalyst. Background technique [0002] Among the new types of photocatalysts, bismuth-based photocatalysts have attracted more and more attention from researchers due to their unique electronic energy state structure, excellent visible light absorption capacity and efficient organic degradation ability. Bi 2 O 3 As a bismuth-based photocatalyst, it has a unique electronic energy state structure, excellent visible light absorption ability and efficient organic degradation ability. It mainly has 4 crystal phases of α, β, γ and δ, and its band gap has a wide distribution range ( 2~3.96eV), can absorb and utilize part of the visible light with a wavelength greater than 400nm, and is a visible light catalyst with potential application value. [0003] To further improve Bi 2 O 3 To absorb and utilize visible light,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
Inventor 陈宗宗
Owner NINGBO DIYANG ELECTRONICS TECH
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