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Bismuth tungstate-bismuth molybdate heterojunction photocatalytic material, method for preparing same and application of bismuth tungstate-bismuth molybdate heterojunction photocatalytic material

A photocatalytic material, a technology of bismuth molybdate, which is applied in the field of photocatalytic materials, can solve the problems of difficult separation of photogenerated carriers and low visible light catalytic activity, and achieves the effects of simple process, good photoelectric performance, and favorable separation.

Inactive Publication Date: 2016-07-06
XINXIANG MEDICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solved the problems of single bismuth tungstate and bismuth molybdate with low visible light catalytic activity and difficult separation of photogenerated carriers, and the composite photocatalyst showed high visible light photocatalytic activity and stability

Method used

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  • Bismuth tungstate-bismuth molybdate heterojunction photocatalytic material, method for preparing same and application of bismuth tungstate-bismuth molybdate heterojunction photocatalytic material
  • Bismuth tungstate-bismuth molybdate heterojunction photocatalytic material, method for preparing same and application of bismuth tungstate-bismuth molybdate heterojunction photocatalytic material
  • Bismuth tungstate-bismuth molybdate heterojunction photocatalytic material, method for preparing same and application of bismuth tungstate-bismuth molybdate heterojunction photocatalytic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1-Synthesis of Bismuth Tungstate

[0048] 1) Weigh 2.4260g (5mmol) Bi(NO 3 ) 3 ·5H 2 O was dissolved in 40 mL of ethylene glycol to form solution A.

[0049] 2) Weigh 0.8250g (2.5mmol) Na 2 WO 4 ·2H 2 O was dissolved in 10 mL of water to form solution B.

[0050] 3) Slowly add solution B dropwise to solution A under magnetic stirring, and continue stirring for 1 hour to make it evenly mixed.

[0051] 4) Transfer the turbid liquid obtained in step 3) to a 100mL polytetrafluoroethylene lined autoclave, seal it, place it in an oven and heat it to react at a constant temperature at 160°C for 12 hours. After the reaction is over, make the reactor Naturally cool to room temperature. Centrifugal separation to collect the precipitate, washing, vacuum drying to obtain the sample Bi 2 WO 6 .

Embodiment 2

[0052] Example 2-Preparation of bismuth tungstate-bismuth molybdate heterojunction

[0053] 1) Weigh 0.4850g (1mmol) Bi(NO 3 ) 3 ·5H 2 O was dissolved in 40mL ethylene glycol to form a solution, and then the Bi prepared in Example 1 2 WO 6 0.6833g (1mmol) was dispersed in it, and stirred for 30min to mix well.

[0054] 2) Weigh 0.1210g (0.5mmol) Na 2 MoO 4 ·2H 2 O was dissolved in 10 mL of water, slowly added dropwise to the mixture obtained in step 1) under magnetic stirring, and stirring was continued for 1 hour to make it uniform.

[0055] 3) Transfer the turbid liquid obtained in step 2) to a 100 mL polytetrafluoroethylene lined autoclave. React at a constant temperature at 160°C for 12 hours. After the reaction is over, the reaction kettle is naturally cooled to room temperature. Centrifugal separation, washing, vacuum drying to obtain Bi 2 WO 6 / Bi 2 MoO 6 (50%) heterojunction, denoted as MW-0.5.

[0056] 4) Change the ratio of Mo source and W source in step 2) and step 1) to o...

Embodiment 3

[0065] Example 3: Photocatalytic degradation of metronidazole

[0066] Metronidazole (MNZ) is a commonly used nitroimidazole antibiotic in clinical practice, and it is also often used as a feed additive. It is easily soluble in water and difficult to biodegrade, and it is difficult to remove it by traditional sewage treatment methods, which has caused pollution hazards in multiple media.

[0067] A 500W xenon lamp is used as the light source, equipped with a 420nm filter to obtain visible light, that is, light with a wavelength less than 420nm cannot pass through, which can effectively avoid ultraviolet light interference. Use circulating cooling water to cool the light source so that the reaction proceeds in a constant temperature environment. Disperse 50 mg of photocatalyst uniformly in a quartz test tube containing 50 ml of 5 mg / L metronidazole aqueous solution, and place it in the dark for 2 hours to achieve adsorption-desorption equilibrium. Turn on the light source, take 4 ...

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Abstract

The invention discloses a bismuth tungstate-bismuth molybdate heterojunction photocatalytic material, a method for preparing the same and application of the bismuth tungstate-bismuth molybdate heterojunction photocatalytic material.The method includes carrying out hydrothermal synthesis on Bi(NO3) 3 5H2O and Na2WO4 2H2O to obtain Bi2WO6; depositing Bi2MoO6 on the surfaces of the Bi2WO6 and carrying out hydrothermal reaction at the constant temperature of 160 DEG C for 12 hours to obtain a BI2WO6-Bi2MoO6 heterojunction photocatalyst.The bismuth tungstate-bismuth molybdate heterojunction photocatalytic material, the method and the application have the advantages that processes in preparation procedures are simple, and accordingly the bismuth tungstate-bismuth molybdate heterojunction photocatalytic material and the method are suitable for large-scale production; colored dye rhodamine and colorless antibiotic metronidazole can be catalytically degraded by the bismuth tungstate-bismuth molybdate heterojunction photocatalytic materials in visible light, and accordingly the bismuth tungstate-bismuth molybdate heterojunction photocatalytic material is universal; the Bi2MoO6 is uniformly dispersed on the surfaces of the Bi2WO6, interfaces of the Bi2MoO6 and the Bi2WO6 are in excellent contact with one another, the bismuth tungstate-bismuth molybdate heterojunction photocatalytic material is favorable for transporting photo-induced carriers between two semiconductors and separating the photo-induced carriers from one another between the two semiconductors, recombination of photo-induced electron-hole pairs can be effectively inhibited, and accordingly the photocatalytic activity of the composite semiconductor catalyst can be improved.

Description

Technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to a bismuth tungstate-bismuth molybdate heterojunction photocatalytic material, and a preparation method and application thereof. Background technique [0002] Environment and energy have become two major themes in today's society. Semiconductor photocatalysis technology can not only use solar energy to repair the polluted environment, but also effectively convert solar energy into clean energy such as electricity and hydrogen energy. Improving the energy efficiency and activity of photocatalysts is one of the key scientific issues in this field. It is difficult for a single-component photocatalyst to effectively use both ultraviolet light and visible light at the same time, and the recombination probability of photogenerated carriers is high, which limits its catalytic activity. Studies have shown that the combination of two semiconductors to form a heterojunction is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/31C02F1/30C02F101/38
CPCC02F1/30B01J23/002B01J23/31C02F2101/308C02F2101/38C02F2305/10B01J2523/00B01J35/40B01J35/39B01J2523/54B01J2523/68B01J2523/69Y02W10/37
Inventor 闫云辉李向荣倪天军刘林霞杨振华
Owner XINXIANG MEDICAL UNIV
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