Preparation method and application of BiVO4-BiOBr photocatalyst

A bismuth oxybromide and photocatalyst technology, applied in the direction of light water/sewage treatment, disinfection, irradiation, etc., can solve the problems of low photocatalytic efficiency of visible light, difficulty in electron and hole migration, low redox potential, etc. The effect of uniform appearance, reliable source and good dispersion

Inactive Publication Date: 2015-10-28
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These prepared BiVO 4 Although BiOBr and BiOBr have certain photocatalytic activity, there are common problems such as low visible light photocatalytic efficiency and difficult recycling.
[0005] The BiOBr photocatalyst has the disadvantages of floating on the liquid surface, insufficient contact with the substrate, low photocatalytic efficiency, and difficult recovery, while the monoclinic phase BiVO with the highest activity among the three crystal phases 4 The conduction band position ratio of the oxygen one-electron reduction reaction O 2 +H + +e - →HO 2 Therefore, its photogenerated electrons are not easy to be captured by oxygen in the air and accumulate on the surface of the catalyst, resulting in difficulty in the migration of electron and hole pairs, and easy and simple recombination. In addition, BiVO 4 The adsorption performance of the reactants is weak, so that even the BiVO of monoclinic scheelite responding to visible light 4 activity is still low

Method used

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  • Preparation method and application of BiVO4-BiOBr photocatalyst
  • Preparation method and application of BiVO4-BiOBr photocatalyst
  • Preparation method and application of BiVO4-BiOBr photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh 1.940g (0.004mol) Bi(NO 3 ) 3 ·5H 2 O and 0.468g (0.004mol) NH 4 VO 3 respectively in 30mL 2.0mol / L HNO 3 Dissolve in 30mL 2mol / L NaOH by ultrasonic for 30min, then slowly inject any one of the liquids into another liquid with a syringe, and continue ultrasonication for 30min to make it completely dispersed, then use 6mol / LNaOH and 5mol / L HNO 3 Adjust the pH of the solution to 7.8, then stir for 1 hour, transfer to a high-pressure reactor, and react at 160°C for 12 hours. After natural cooling, the sample is filtered with suction and washed with a large amount of water, and dried at 50°C to obtain the monoclinic scheelite phase BiVO 4 catalyst.

[0035] Weigh the synthesized monoclinic phase BiVO 4 Catalyst 0.648g (0.002mol), Bi(NO 3 ) 3 ·5H 2 O 1.94g (0.004mol) and NaBr 0.41g (0.004mol) were added to ethanol and sonicated for 30min to obtain three homogeneously dispersed precursors. 4 The precursor and the NaBr precursor were injected separately (Bi(NO ...

Embodiment 2

[0043] Weigh 1.940g (0.004mol) Bi(NO 3 ) 3 ·5H 2 O and 0.468g (0.004mol) NH 4 VO 3 respectively in 30mL2.0mol / L HNO 3 Dissolve in 30mL 2mol / L NaOH by ultrasonic for 30min, then slowly inject any one of the liquids into another liquid with a syringe, and continue ultrasonication for 30min to make it completely dispersed, then use 6mol / LNaOH and 5mol / L HNO 3 Adjust the pH of the solution to 5.8, then stir for 1 hour, transfer to a high-pressure reactor, and react at 160°C for 12 hours. After natural cooling, the sample is filtered with suction and washed with a large amount of water, and dried at 50°C to obtain the monoclinic scheelite phase BiVO 4 catalyst.

[0044] Weigh the synthesized monoclinic phase BiVO 4 Catalyst 0.648g (0.002mol), (Bi(NO 3 ) 3 ·5H 2 O) 1.94g (0.004mol) and NaBr 0.41g (0.004mol) were added to ethanol and sonicated for 30min to obtain three homogeneously dispersed precursors, and the BiVO 4 The precursor and the NaBr precursor were injected sepa...

Embodiment 3

[0046] Weigh 1.940g (0.004mol) Bi(NO 3 ) 3 ·5H 2 O and 0.468g (0.004mol) NH 4 VO 3 respectively in 30mL2.0mol / L HNO 3 Dissolve in 30mL 2mol / L NaOH by ultrasonic for 30min, then slowly inject any one of the liquids into another liquid with a syringe, and continue ultrasonication for 30min to make it completely dispersed, then use 6mol / LNaOH and 5mol / L HNO 3 Adjust the pH of the solution to 7.8, then stir for 1 h, transfer to a high-pressure reactor, and react at 200 ° C for 12 h. After natural cooling, the sample is filtered with suction and washed with a large amount of water, and dried at 50 ° C to obtain the monoclinic scheelite phase BiVO 4 catalyst.

[0047] Weigh the synthesized monoclinic phase BiVO 4 Catalyst 0.648g (0.002mol), Bi(NO 3 ) 3 ·5H 2 O 1.94g (0.004mol) and NaBr 0.41g (0.004mol) were added to ethanol and sonicated for 30min to obtain three homogeneously dispersed precursors. 4 The precursor and the NaBr precursor were injected separately (Bi(NO 3 )...

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Abstract

The invention discloses a preparation method of BiVO4-BiOBr photocatalyst has a visible-light response, wherein the catalyst may be used under visible light, ultraviolet light, or sunlight. The preparation method of BiVO4-BiOBr photocatalyst that is in a multilevel nest-like nanostructure and is formed by nanosheets is: heating for 8 to 24 h under an alcohol-heating temperature of 100 to 200 DEG C with pH of 5 to 10. The catalyst of the invention can decompose water-soluble organic pollutant containing chlorine and sulfur, water-soluble organic pollutant of azo, xanthene, and anthraquinone type, and biological contaminant microcystic toxins generated by harmful algal bloom.

Description

technical field [0001] The technical field related to the present invention is the technical field of inorganic nanometer photocatalytic materials, in particular, it relates to a photocatalyst with visible light response and a highly active multilevel bird's nest structure and a preparation method thereof. Background technique [0002] With the development of industry and human living standards, the problem of environmental pollution has become very serious. In my country, nearly 95% of lakes are polluted by toxic and harmful substances such as domestic sewage, printing and dyeing wastewater, small organic molecules, and even algae toxins. About 164 million people have to drink water with serious organic pollution. At present, in order to solve this serious environmental problem, humans have adopted a variety of methods (such as: physical adsorption, coagulation sedimentation, microbial degradation, etc.) to deal with, and played a certain role, but these methods still have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06C02F1/30A61L9/01A61L9/18
Inventor 黄应平吴春红方艳芬赵萍周薇贾漫珂
Owner CHINA THREE GORGES UNIV
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