Hollow ball-flower-like beta-Bi2O3/BiOBr (bismuth trioxide/bismuth oxybromide) heterojunction photocatalysis material and preparation method and application thereof

A photocatalytic material, hollow flower technology, applied in the field of composite photocatalytic material synthesis, can solve the problems of transformation, high probability of photo-generated holes and electrons recombination, instability, etc., to achieve large specific surface area, good separation, mild conditions. Effect

Inactive Publication Date: 2017-10-10
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore β-Bi 2 o 3 Has a strong visible light response ability, but using β-Bi alone 2 o 3 There are two major defects in photocatalysts: one is β-Bi 2 o 3 The recombination probability of photogenerated holes and electrons is relatively high; the second is β-Bi 2 o 3 Unstable during the reaction, undergoing a phase transition and leading to the formation of other products under slight changes in temperature conditions
At present, it has been reported in the literature that the synthesis of sheet-like α-Bi 2 o 3 / BiOBr heterostructure, but there is no information about β-Bi 2 o 3 / BiOBr heterojunction related reports, especially β-Bi with hollow flower spherical morphology 2 o 3 / BiOBr heterojunction

Method used

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  • Hollow ball-flower-like beta-Bi2O3/BiOBr (bismuth trioxide/bismuth oxybromide) heterojunction photocatalysis material and preparation method and application thereof
  • Hollow ball-flower-like beta-Bi2O3/BiOBr (bismuth trioxide/bismuth oxybromide) heterojunction photocatalysis material and preparation method and application thereof
  • Hollow ball-flower-like beta-Bi2O3/BiOBr (bismuth trioxide/bismuth oxybromide) heterojunction photocatalysis material and preparation method and application thereof

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Embodiment 1

[0021] (1) Hollow flower spherical β-Bi 2 o 3 Synthesis

[0022] Weigh 1.455g Bi(NO 3 ) 3 ·5H 2 O was dissolved in a mixed solution of 15mL glycerin and 15mL ethanol, stirred for 40min, the mixed solution was poured into a 50mL reaction kettle (lined with polytetrafluoroethylene), heated to 160°C in a blast-type constant temperature drying oven for 3h, The reactor was naturally cooled to room temperature, and the obtained precipitate was washed three times with absolute ethanol and deionized water, and dried in vacuum at 60 °C for 12 h, and finally the product was placed in a muffle furnace from room temperature at a heating rate of 2 °C / min. Raise the temperature to 270°C and keep at 270°C for 2h, then cool to room temperature to obtain hollow flower spherical β-Bi 2 o 3 ;

[0023] (2) Hollow flower spherical β-Bi 2 o 3 Synthesis of / BiOBr Heterojunction Photocatalytic Materials

[0024] Weigh 0.4660g of the hollow flower spherical β-Bi prepared in step (1) 2 o 3 ...

Embodiment 2

[0029] β-Bi 2 o 3 / BiOBr heterojunction photocatalytic material photocatalytic degradation of Lanersol Red: carried out in the HXSEI photocatalytic reaction instrument (Hongxing Educational Instrument Factory, Kaifeng City), a 500W xenon lamp was placed in the middle of the reaction instrument as a light source, and the xenon lamp was outside It is a quartz cooling trap with circulating cooling water inside. In the photocatalytic reaction, the initial concentration of lannasol red simulated wastewater was 40mg / L, the solution volume was 45mL, and the catalyst dosage was 45mg. Before the photocatalytic reaction, the lannersine red suspension containing the photocatalyst was dispersed under ultrasonic waves for 5 min, and then the quartz tube was fixed in the photocatalytic reaction instrument. Adsorb under dark conditions for 30 minutes to reach the equilibrium of physical adsorption and desorption. Turn on the cooling water first, then turn on the light source, and start tim...

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Abstract

The invention discloses a hollow ball-flower-like beta-Bi2O3 / BiOBr (bismuth trioxide / bismuth oxybromide) heterojunction photocatalysis material and a preparation method and application thereof, and belongs to the technical field of synthesizing of composite photocatalysis materials. The hollow ball-flower-like beta-Bi2O3 / BiOBr heterojunction photocatalysis material is technically characterized in that the hollow ball-flower-like beta-Bi2O3 / BiOBr heterojunction photocatalysis material is a hollow ball-flower-like particle with average particle size of 2mu m and consists of hollow ball-flower-like beta-Bi2O3 and BiOBr nanosheets which are grown on the hollow ball-flower-like beta-Bi2O3 in situ. The invention particularly discloses the preparation method of the hollow ball-flower-like beta-Bi2O3 / BiOBr heterojunction photocatalysis material and application in photocatalysis treatment of lanasol red wastewater. The hollow ball-flower-like beta-Bi2O3 / BiOBr heterojunction photocatalysis material has the advantages that the cost of raw materials is low, the raw materials is easy to obtain, the green and environment-friendly effects are realized, the conditions are moderate, the material is suitable for scaled production, and the good social and economical benefits are expected to produce.

Description

technical field [0001] The invention belongs to the technical field of synthesis of composite photocatalytic materials, in particular to a hollow flower spherical β-Bi 2 o 3 / BiOBr heterojunction photocatalytic material and its preparation method and application. Background technique [0002] Azo dyes have become the most widely used dyes. They will be released into the environment during production and use, and are difficult to degrade naturally, posing a great threat to the health of humans and other organisms. Therefore, recent studies on the degradation of azo dyes have attracted much attention. The use of photocatalytic technology to degrade azo dye wastewater has the advantages of simplicity, low consumption, high efficiency, complete degradation of pollutants, and no secondary pollution, so it has become a recent research hotspot. [0003] Bi 2 o 3 It is a new bismuth-based semiconductor photocatalytic material with a narrow band gap, Bi 2 o 3 There are two mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/08B01J35/08B01J35/10C02F1/30
CPCC02F1/30B01J27/08C02F2101/308C02F2305/10B01J35/51B01J35/61B01J35/40B01J35/39Y02W10/37
Inventor 周建国游盛楠李莉刘璐璐史小昆赵凤英
Owner HENAN NORMAL UNIV
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