Bismuth ferrite-graphene compounding magnetism visible light catalyst, as well as preparation method and application of same

A graphene composite and photocatalyst technology applied in the field of visible light catalysis to achieve good catalytic activity

Inactive Publication Date: 2012-08-08
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on bismuth ferrite and bismuth ferrite composite materials is still in the exploratory stage, and its preparation method, modification and photocatalytic degradation mechanism of pollutants need to be further discussed.

Method used

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  • Bismuth ferrite-graphene compounding magnetism visible light catalyst, as well as preparation method and application of same
  • Bismuth ferrite-graphene compounding magnetism visible light catalyst, as well as preparation method and application of same
  • Bismuth ferrite-graphene compounding magnetism visible light catalyst, as well as preparation method and application of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Bi 25 FeO 40 Preparation of -20% graphene

[0029] (1) Use the Hummers method to synthesize graphite oxide. The specific steps are as follows: heat 10ml of concentrated sulfuric acid solution containing 5g of potassium persulfate and 5g of phosphorus pentoxide to 353K, add 10g of graphite powder into it for pre-oxidation for 6h, cool and wash to neutral . Under ice-bath conditions, the obtained material was added to 230ml of concentrated sulfuric acid solution, and then 30g of potassium permanganate was slowly added. Adjust the temperature of the mixed solution to 298K and react for 2 hours, add 1L of deionized water and 25ml of 30% hydrogen peroxide to it, wash and dialyze after the reaction is complete, and ultrasonically disperse the obtained graphite oxide in deionized water;

[0030] (2) Add 5mmol Bi(NO 3 ) 3 and 5mmol Fe(NO 3 ) 3 Dissolve in 1mol / L (10%) nitric acid solution, add 6 mol / L KOH solution dropwise under constant stirring until the ...

Embodiment 2

[0041] Example 2: Bi 25 FeO 40 Preparation of -10% graphene

[0042] In embodiment 2, the add-on of graphite oxide in the catalyst synthesis process is 10%, and its preparation steps are as follows:

[0043] (1) Graphite oxide was synthesized by the Hummers method, and the specific steps were as in step (1) in Example 1;

[0044] (2) Add 5mmol Bi(NO 3 ) 3 and 5mmol Fe(NO 3 ) 3 Dissolve in 1mol / L (10%) nitric acid solution, add 8 mol / L KOH solution dropwise under constant stirring until the solution is alkaline (pH=9);

[0045] (3) Add the graphite oxide prepared in (1) to (2), mix ultrasonically for 50 minutes at 35°C, filter and wash the obtained material, and the amount of graphite oxide added is about 10% of the mass of the composite;

[0046] (4) Add 40ml of 12 mol / L KOH solution and 0.1mol potassium nitrate to (3), stir for 10 minutes, transfer to the reaction kettle 433K for hydrothermal reaction for 24 hours;

[0047] (5) The product obtained in (4) was centr...

Embodiment 3

[0050] Example 3: Bi 25 FeO 40 Preparation of -30% graphene

[0051] In embodiment 3, the add-on of graphite oxide in the catalyst synthesis process is 30%, and its preparation steps are as follows:

[0052] (1) Graphite oxide was synthesized by the Hummers method, and the specific steps were as in step (1) in Example 1;

[0053] (2) Add 5mmol Bi(NO 3 ) 3 and 5mmol Fe(NO 3 ) 3 Dissolve in 1mol / L (10%) nitric acid solution, add 8 mol / L KOH solution dropwise under constant stirring until the solution is alkaline (pH=9);

[0054] (3) Add the graphite oxide prepared in (1) to (2), mix it ultrasonically for 40 minutes, filter and wash the obtained material, and the amount of graphite oxide added is about 30% of the mass of the compound;

[0055] (4) Add 40ml of 12 mol / L KOH solution and 0.1mol potassium nitrate to (3), stir for 10 minutes, transfer to the reaction kettle 433K for hydrothermal reaction for 24 hours;

[0056] (5) The product obtained in (4) was centrifuged...

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Abstract

The invention discloses a bismuth ferrite-graphene compounding photochemical catalyst with visible light responds, and a preparation method of the bismuth ferrite-graphene compounding photochemical catalyst. The catalyst prepared by the method comprises the following components according to mass percentage: 60-95% of bismuth ferrite and 5-40% of graphene. The preparation method is characterized in that the reduction of graphite oxide and the compounding of the bismuth ferrite and the graphene are finished by one step, and the catalyst prepared by the method has relatively high magnetism and good visible light responds. When the catalyst prepared by the method is used for treating methylthionine chloride solution by using visible light catalysis, a relatively good degradation effect can be obtained. Therefore, the invention has significance in the development of the visible light catalyst, and the visible light catalyst has a good application prospect when being used for sewage treatment.

Description

technical field [0001] The invention belongs to the field of visible light catalysis, and in particular relates to the preparation of a bismuth ferrite-graphene composite magnetic photocatalyst and its application in visible light catalysis. Background technique [0002] With the development of society and economy, energy and ecological environment issues have attracted widespread attention. Energy shortage and environmental pollution are urgent problems to be solved in order to realize the sustainable development of society. Among various pollution treatment technologies, visible light catalysis technology can directly use visible light to degrade or even mineralize pollutants, and has good application prospects in environmental protection and new energy development. As the most studied photocatalytic material, TiO 2 Because of its wide bandgap, it only responds to ultraviolet light (accounting for about 5% of solar energy), which limits its practical application. In o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/843B01J35/00A62D3/10A62D101/28
Inventor 江芳陈欢孙爱武汪信宋春艳闫婷婷陈晶妮
Owner NANJING UNIV OF SCI & TECH
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