Preparation and application of copper-bismuth/bismuth vanadate composite photocatalyst

A technology of bismuth vanadate and compound light, which is applied in the field of photocatalysis, can solve the problems of narrow energy band structure, easy recombination of photogenerated holes and electrons, and small specific surface area, so as to achieve enhanced synergistic effect, improved photocatalytic performance, The effect of improving transmission efficiency

Inactive Publication Date: 2019-02-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although bismuth vanadate has good visible light absorption properties, due to its small specific surface area, narrow energy band structure, and easy recombination of photogenerated holes and electrons, the actual quantum efficiency is not high and the photocatalytic activity is not high.
Therefore, many studies have used a large number of methods including noble metal deposition, semiconductor recombination, metal ion and non-metal ion doping to modify bismuth vanadate, but the effect is still not ideal.

Method used

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  • Preparation and application of copper-bismuth/bismuth vanadate composite photocatalyst
  • Preparation and application of copper-bismuth/bismuth vanadate composite photocatalyst
  • Preparation and application of copper-bismuth/bismuth vanadate composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Preparation of reticular bismuth / bismuth vanadate composite nanostructure: take 1mmol Bi(NO 3 ) 3 ·5H 2 Dissolve the O crystals in 15mL of ethylene glycol solution, stir to make it completely dissolve, and form a transparent solution, which is recorded as A solution; take 1mmol NH 4 VO 3 Dissolve the powder in 15mL of ethylene glycol solution, stir to dissolve it completely, and form a transparent solution, which is recorded as solution B; add solution B dropwise to solution A to obtain a light yellow mixed solution, transfer it to 40mL after stirring for 30 minutes In a high-pressure reactor, the reactor was placed in an oven at 180°C and reacted for 10 hours. Bi(NO 3 ) 3 ·5H 2 O and NH 4 VO 3 The ratio of the amount of substances is 1:1. The obtained product was alternately washed with ethanol and water, and dried in a vacuum oven at 60° C. for 6 hours to obtain bismuth / bismuth vanadate.

Embodiment 2

[0042] Preparation of reticular bismuth / bismuth vanadate composite nanostructure: take 1mmol Bi(NO 3 ) 3 ·5H 2 Dissolve the O crystals in 15mL of ethylene glycol solution, stir to make it completely dissolve, and form a transparent solution, which is recorded as A solution; take 1mmol NH 4 VO 3 Dissolve the powder in 15mL of ethylene glycol solution, stir to dissolve it completely, and form a transparent solution, which is recorded as solution B; add solution B dropwise to solution A to obtain a light yellow mixed solution, transfer it to 40mL after stirring for 30 minutes In a high-pressure reactor, the reactor was placed in an oven at 160°C, and reacted for 8 hours. Bi(NO 3 ) 3 ·5H 2 O and NH 4 VO 3 The ratio of the amount of substances is 1:1. The obtained product was alternately washed with ethanol and water, and dried in a vacuum oven at 60° C. for 6 hours to obtain bismuth / bismuth vanadate.

Embodiment 3

[0044] Preparation of copper-bismuth / bismuth vanadate composite photocatalyst: take 0.1310 g of bismuth / bismuth vanadate prepared in Example 1 of the present invention and disperse in 30mL6.7mmol / L copper acetate solution, disperse, and constantly stir, the solution is stirred After 1h, it was transferred to a 40mL high-pressure reactor, and the reactor was placed in an oven at 120°C for 6 hours of reaction. The synthesized brown-yellow sample is the copper-bismuth / bismuth vanadate composite photocatalyst. The synthesized samples were washed alternately with ethanol and water, and dried in a vacuum oven at 60 °C for 6 h.

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Abstract

The invention discloses a preparation method of a copper-bismuth / bismuth vanadate composite photocatalytic material, and belongs to the technical field of photocatalysis. The copper nanosheet-bismuthnanoparticle / bismuth vanadate composite photocatalytic material is formed in the mode that the surface of bismuth / bismuth vanadate with a mesh structure is coated with a copper nanosheet. The preparation method of the copper-bismuth / bismuth vanadate composite photocatalytic material comprises the steps: ammonium metavanadate and bismuth nitrate serve as raw materials to be subjected to a solvent thermal reaction in an ethylene glycol solution, and the mesh nanostructure of the bismuth / bismuth vanadate is obtained. After the bismuth / bismuth vanadate is dispersed in a copper acetate solution tobe mixed, a hydrothermal reaction is carried out, copper ions are reduced to copper simple substances through partial bismuth simple substances, meanwhile, amorphous bismuth vanadate is converted to crystalline bismuth vanadate, and thus the copper nanosheet-bismuth nanoparticle / bismuth vanadate composite photocatalyst is prepared. According to the composite photocatalyst, through the synergisticeffect of the bismuth vanadate, the bismuth and copper, the light response range is enlarged, the separation efficiency of light-generated electrons and hole pairs is improved, and thus the photocatalytic activity of photocatalytic reduction of carbon dioxide is improved.

Description

technical field [0001] The invention relates to a ternary composite photocatalyst composed of bismuth vanadate network nanostructure, bismuth nanoparticles and copper nanosheets, a method for hydrothermally synthesizing copper-bismuth / bismuth vanadate composite photocatalyst and its application in photocatalytic reduction The application in carbon dioxide belongs to the technical field of photocatalysis. Background technique [0002] With the rise of the industrial revolution, industrialization, and the prosperity and development of human society, fossil fuels, as the main energy source for human economic development, are facing a crisis of depletion under the ever-increasing global energy demand. On the other hand, the combustion of fossil fuels and human activities have caused excessive emissions of greenhouse gases such as carbon dioxide, which has caused a series of environmental problems, such as global warming, melting of glaciers, and land desertification. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/843B01J37/16B01J37/10B01D53/86B01D53/62
CPCB01D53/8671B01D2257/504B01J23/8437B01J35/004B01J35/006B01J35/0073B01J37/10B01J37/16Y02A50/20
Inventor 陈立妙丰欣妍段泽宇
Owner CENT SOUTH UNIV
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