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Bismuth series photocatalyst, and preparation method thereof

A photocatalyst, bismuth-based technology, applied in the field of photocatalysis, can solve problems such as inability to absorb visible light, and achieve the effect of improving photocatalytic efficiency

Inactive Publication Date: 2012-07-25
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the (BiO) in the prior art 2 CO 3 The bandgap width of BiO is 3.1eV~3.5eV, and it has photocatalytic activity only under ultraviolet light irradiation, and cannot absorb visible light, which limits the (BiO) 2 CO 3 Applications of bismuth-like photocatalysts

Method used

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  • Bismuth series photocatalyst, and preparation method thereof
  • Bismuth series photocatalyst, and preparation method thereof
  • Bismuth series photocatalyst, and preparation method thereof

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preparation example Construction

[0043] The invention provides a kind of preparation method of bismuth series photocatalyst, comprises the following steps:

[0044] Bismuth source and nitrogen source are carried out hydrothermal reaction in aqueous solution, obtain the bismuth series photocatalyst with molecular formula shown in formula (I):

[0045] N m [(BiO) 2 CO 3 ] (1-m) (I);

[0046] Among them, m is 0.01% to 5%;

[0047] The bismuth source is bismuth citrate or bismuth ammonia citrate.

[0048] In the present invention, a bismuth source and a nitrogen source are first dissolved in water to obtain a mixed solution; the bismuth source is bismuth citrate or bismuth ammonium citrate. In the present invention, preferably, the aqueous solution of the nitrogen source is prepared first, and then the bismuth source is added to the aqueous solution of the nitrogen source to obtain a mixed solution. In the present invention, the nitrogen source is preferably ammonia water, ammonium sulfate, ammonium bi...

Embodiment 1

[0066] Dilute 1.6mL of concentrated ammonia water with a mass concentration of 32% to 75mL with deionized water to obtain an aqueous ammonia solution with a mass concentration of 1.5%, add 1.6g of bismuth citrate to it, stir for 30min, and transfer the resulting mixed solution into 100mL of hydrothermal In the kettle, the hydrothermal reaction was carried out at 210°C for 48 hours. After the reaction, the reaction product in the hydrothermal kettle was taken out, the reaction product was centrifuged, filtered, washed with water twice and washed with ethanol twice, and the obtained solid was dried at 80° C. to obtain a bismuth-based photocatalyst.

[0067] The present invention carries out XRD analysis to the obtained bismuth photocatalyst, the result is as follows figure 1 as shown, figure 1 For the XRD spectrum of the bismuth photocatalyst prepared in Example 1 of the present invention, by figure 1 It can be seen that the phase of the bismuth photocatalyst obtained in this ...

Embodiment 2

[0070] Dilute 5.3mL of concentrated ammonia water with a mass concentration of 32% to 75mL with deionized water to obtain an aqueous ammonia solution with a mass concentration of 4.53%, add 1.6g of bismuth citrate to it, stir for 30min, and transfer the resulting mixed solution into 100mL of hydrothermal In the kettle, the hydrothermal reaction was carried out at 180°C for 24 hours. After the reaction, the reaction product in the hydrothermal kettle was taken out, the reaction product was centrifuged, filtered, washed with water twice and washed with ethanol twice, and the obtained solid was dried at 80° C. to obtain a bismuth-based photocatalyst.

[0071] The present invention carries out XRD analysis to the obtained bismuth-based photocatalyst, and the result shows that the phase of the bismuth-based photocatalyst obtained in the present embodiment is (BiO) 2 CO 3 ; The present invention carries out XPS analysis to the prepared bismuth photocatalyst, the result is as follow...

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Abstract

The invention provides a bismuth series photocatalyst. The bismuth series photocatalyst has a molecular formula represented by formula (I): Nm[(BiO)2CO3] (1-m) (I), wherein m is ranged in 0.01-5%. According to the invention, a bismuth source and a nitrogen source are used as raw materials, a hydrothermal reaction is carried out on the raw materials in a water solution, and the bismuth series photocatalyst having the molecular formula represented by formula (I) is obtained. The bismuth source is bismuth citrate or bismuth citrate ammonia. In the bismuth series photocatalyst provided by the invention, N element is introduced into the crystal lattice of the (BiO)2CO3 crystal; due to the presence of the N element, the band gap of the bismuth series photocatalyst provided by the invention is reduced to 2.0-2.9eV, and the absorption spectrum is expanded to the visible region from the ultraviolet region, in this way, the bismuth series photocatalyst can be excited by the visible light, and has a high visible light catalytic activity. Furthermore, the preparation method provided by the invention is mild in reaction condition and simple in operation, and the preparation method is suitable for large scale production.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a bismuth-based photocatalyst and a preparation method thereof. Background technique [0002] Environmental pollution and energy shortage are the major challenges facing human beings. Solar energy is an emerging clean energy. Using solar energy to solve global environmental and energy problems has attracted more and more attention from scholars at home and abroad. In terms of environment, photocatalytic technology uses solar energy to degrade or mineralize various pollutants in water and air; in terms of energy, photocatalytic technology can convert low-density solar energy into high-density chemical energy and electrical energy. Photocatalysis, which uses solar energy to solve energy and environmental problems, has attracted more and more attention from researchers. Photocatalysis has great application potential in purifying the environment and developing clean energy. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18B01D53/56B01D53/86
Inventor 董帆孙艳娟蒋彦可马昊
Owner CHONGQING TECH & BUSINESS UNIV
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