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Preparation method and application of bismuth sulfide-bismuth ferrite composite visible light catalyst

A technology of bismuth ferrite and catalyst, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of unsatisfactory photocatalytic activity and high recombination rate of photogenerated carriers, and achieve convenient industrialization The effect of promotion, high catalytic activity and good reproducibility

Inactive Publication Date: 2019-12-20
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Bi 2 S 3 It is a typical layered semiconductor material with a band gap of 1.3-1.7eV, and it is a photocatalyst that responds to visible light. However, due to its high recombination rate of photogenerated carriers, a single Bi 2 S 3 The photocatalytic activity is not ideal

Method used

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  • Preparation method and application of bismuth sulfide-bismuth ferrite composite visible light catalyst
  • Preparation method and application of bismuth sulfide-bismuth ferrite composite visible light catalyst
  • Preparation method and application of bismuth sulfide-bismuth ferrite composite visible light catalyst

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Effect test

Embodiment 1

[0034] A kind of bismuth sulfide-bismuth ferrite composite visible light catalyst, the steps of its preparation method are as follows:

[0035] 1) Using bismuth source and iron source as raw materials, mix and dissolve them in the organic solvent ethylene glycol according to the molar ratio of bismuth and iron elements at a ratio of 1:1 to prepare a precursor liquid, and ultrasonically disperse at 60°C for 0.5 h, obtaining a sol, the molar ratio of the bismuth element in the bismuth source and the iron element in the iron source is 1:1; the bismuth source is bismuth nitrate and hydrate thereof, and the iron source is iron nitrate and hydrate thereof;

[0036]2) drying the prepared sol at 120° C. for 4-5 days to obtain xerogel powder;

[0037] 3) After grinding the obtained xerogel powder evenly, put it into a muffle furnace for pretreatment; the treatment temperature is 300°C, and the time is 2h;

[0038] 4) Calcining the pretreated xerogel powder in a muffle furnace at a tem...

Embodiment 2

[0042] A kind of bismuth sulfide-bismuth ferrite composite visible light catalyst, the steps of its preparation method are as follows:

[0043] 1) Using bismuth source and iron source as raw materials, mix and dissolve the two in proportion to the organic solvent ethylene glycol to prepare a precursor solution, and ultrasonically disperse at a temperature of 75°C for 1 hour to obtain a sol. The bismuth in the bismuth source The molar ratio of the iron element in the element and the iron source is 1:1; the bismuth source is bismuth nitrate and hydrate thereof, and the iron source is iron nitrate and hydrate thereof;

[0044] 2) drying the prepared sol at 125° C. for 4 days to obtain xerogel powder;

[0045] 3) After grinding the obtained xerogel powder evenly, put it into a muffle furnace for pretreatment; the treatment temperature is 350°C, and the time is 2h;

[0046] 4) The pretreated xerogel powder was calcined in a muffle furnace at a temperature of 550° C. for 3 hours, t...

Embodiment 3

[0050] A kind of bismuth sulfide-bismuth ferrite composite visible light catalyst, the steps of its preparation method are as follows:

[0051] 1) Using bismuth source and iron source as raw materials, mix and dissolve the two in proportion to the organic solvent ethylene glycol to prepare a precursor solution, and ultrasonically disperse at 80°C for 1 hour to obtain a sol. The bismuth in the bismuth source The molar ratio of the iron element in the element and the iron source is 1:1; the bismuth source is bismuth nitrate and hydrate thereof, and the iron source is iron nitrate and hydrate thereof;

[0052] 2) drying the prepared sol at 120° C. for 5 days to obtain xerogel powder;

[0053] 3) After grinding the obtained xerogel powder evenly, put it into a muffle furnace for pretreatment; the treatment temperature is 350°C, and the time is 3h;

[0054] 4) The pretreated xerogel powder was calcined in a muffle furnace at a temperature of 600° C. for 2 hours, then cooled to roo...

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Abstract

The invention discloses a method for preparing a bismuth sulfide-bismuth ferrite composite visible light catalyst and an application thereof. In this method, a certain amount of sulfur source and bismuth ferrite are dispersed in an absolute ethanol solvent in proportion, and after ultrasonication, they are transferred to a polytetrafluoroethylene-lined reactor for reaction; the brown or black precipitate obtained after the reaction is centrifuged and washed , drying, to obtain different proportions of bismuth sulfide-bismuth ferrite composite photocatalysts; using a halogen tungsten lamp as a visible light source, using rhodamine B dye as an organic pollutant, fully mixing the composite catalyst powder and rhodamine B solution to photocatalyze Degradation of rhodamine B organic pollutants in simulated water environment. The method can remove more than 96% of the rhodamine B dye in water within 3 hours, and the catalyst has good activity and stable performance. The bismuth sulfide-bismuth ferrite is a composite visible light catalyst, which can directly utilize solar energy for photocatalytic oxidation treatment of sewage, and has good development prospects in sewage treatment.

Description

technical field [0001] The invention belongs to the technical field of water treatment photocatalytic oxidation, and in particular relates to the application of a bismuth sulfide-bismuth ferrite composite visible light catalyst in the visible light catalytic degradation of organic pollutants. Background technique [0002] In the context of the global energy crisis and environmental problems, photocatalytic technology using semiconductor-based photocatalysts is considered to be one of the most promising technologies in terms of environmental protection and new energy development. Among them, in the field of environmental catalysis, photocatalytic oxidation can effectively eliminate toxic and harmful refractory organic pollutants, so it has become one of the favored methods in pollutant treatment. TiO 2 Due to its cheap, non-toxic, stable and other advantages, it has become the most important photocatalyst in the field of photocatalysis research. However, because of its wide ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/043B01J35/10C02F1/30C02F1/72C02F101/30C02F101/38
CPCC02F1/30C02F1/725B01J27/043C02F2101/30C02F2101/40B01J35/61B01J35/39Y02W10/37
Inventor 王喜全王杲
Owner UNIV OF SCI & TECH LIAONING
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