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Preparation method and application for bismuth sulfide-bismuth ferrate composite visible-light photocatalyst

A bismuth ferrite and catalyst technology, which is 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 Promotion, high catalytic activity, abundant and easy-to-obtain raw materials

Inactive Publication Date: 2017-05-24
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 for bismuth sulfide-bismuth ferrate composite visible-light photocatalyst

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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 preparation method and an application for a bismuth sulfide-bismuth ferrate composite visible-light photocatalyst. The method comprises the following steps: dispersing certain amounts of a sulfur source and bismuth ferrate into an absolute ethyl alcohol solvent in proportion, carrying out ultrasonic dispersion, transferring the obtained mixture to a polytetrafluoroethylene lining reaction vessel, and carrying out a reaction; after completion of the reaction, subjecting obtained brown or black precipitate to centrifugal separation, and carrying out washing and drying so as to obtain the bismuth sulfide-bismuth ferrate composite photocatalyst with different proportions; and by adopting a halogen tungsten lamp as a visible light source, and a dye rhodamine B as an organic pollutant, fully mixing composite catalyst powder and a rhodamine B solution so as to photocatalytically degrade the organic pollutant rhodamine B in a simulated water environment. The method provided by the invention can remove 96% or above of the dye rhodamine B in water in 3 hours, and the catalyst has good activity and stable performances. The bismuth sulfide-bismuth ferrate is a composite visible-light photocatalyst, can realize photocatalytic oxidation treatment of wastewater by directly utilizing solar energy, and has good development prospects in the field of wastewater 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 Applications(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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