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Preparation and application of bismuth vanadate hollow nanostructure modified by bismuth quantum dots

A technology of nanostructure and quantum dots, which can be used in the separation of dispersed particles, air quality improvement, gas treatment, etc., can solve the problems of difficult industrial production, high price, and low reserves, and achieve wide application, low price, and large specific surface area. Effect

Inactive Publication Date: 2019-03-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these noble metal co-catalysts have achieved remarkable results, they are difficult to produce industrially due to their low reserves and high cost.

Method used

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  • Preparation and application of bismuth vanadate hollow nanostructure modified by bismuth quantum dots
  • Preparation and application of bismuth vanadate hollow nanostructure modified by bismuth quantum dots
  • Preparation and application of bismuth vanadate hollow nanostructure modified by bismuth quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0044] Hollow pie Bi 4 V 2 o 11 Preparation: Weigh 1.7mmol (0.8245g) of Bi(NO 3 )·5H 2 Dissolve the O solid in 20ml of ethylene glycol solution, stir and dissolve at room temperature until the solution is clear, and record it as A solution; weigh 0.85mmol (0.1037g) of NaVO 3 Dissolve the solid in 12ml of pure water, stir and dissolve at room temperature until the solution is clear, and record it as solution B; add solution B dropwise to solution A to obtain a yellow clear solution, continue stirring for 30 minutes, and record it as solution C; Transfer to a 50ml reactor, place the reactor in an oven, and react at a high temperature of 180°C for 10h. The brown product obtained after the reaction was washed with water and ethanol, and then transferred to a vacuum drying oven at 50° C. for 6 h.

Embodiment example 2

[0046] Hollow pie Bi 4 V 2 o 11 Preparation: Weigh 1.4mmol (0.6790g) of Bi(NO 3 )·5H 2Dissolve the O solid in 20ml of ethylene glycol solution, stir and dissolve at room temperature until the solution is clear, and record it as A solution; weigh 0.7mmol (0.0854g) of NaVO 3 Dissolve the solid in 12ml of pure water, stir and dissolve at room temperature until the solution is clear, and record it as solution B; add solution B dropwise to solution A to obtain a yellow clear solution, continue stirring for 30 minutes, and record it as solution C; Transfer to a 50ml reactor, place the reactor in an oven, and react at a high temperature of 160°C for 10h. The brown product obtained after the reaction was washed with water and ethanol, and then transferred to a vacuum drying oven at 50° C. for 6 h.

Embodiment example 3

[0048] Hollow pie Bi 4 V 2 o 11 Preparation: Weigh 2.0mmol (0.97g) of Bi(NO 3 )·5H 2 Dissolve the O solid in 20ml of ethylene glycol solution, stir and dissolve at room temperature until the solution is clear, and record it as A solution; weigh 1.0mmol (0.1220g) of NaVO 3 Dissolve the solid in 12ml of pure water, stir and dissolve at room temperature until the solution is clear, and record it as solution B; add solution B dropwise to solution A to obtain a yellow clear solution, continue stirring for 30 minutes, and record it as solution C; Transfer to a 50ml reactor, place the reactor in an oven, and react at a high temperature of 200°C for 10h. The brown product obtained after the reaction was washed with water and ethanol, and then transferred to a vacuum drying oven at 50° C. for 6 h.

[0049] To the Bi prepared in embodiment 1 4 V 2 o 11 Some crystal structure and morphology studies were performed. Depend on figure 1 As can be seen from the X-ray diffraction (XR...

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Abstract

The invention discloses a preparation method of a novel photocatalyst applied to photocatalytic reduction of CO2. The method mainly comprises building a hollow cake-shaped Bi4V2O11 nanostructure and growing Bi quantum dots on the surface of Bi4V2O11 in situ. The preparation method comprises the following steps: synthetizing the hollow cake-shaped Bi4V2O11 nanostructure by using a solvothermal method; and carrying out hydrothermal reaction on the prepared Bi4V2O11 and a reducer to obtain a Bi4V2O11(Bi / Bi4V2O11) composite nanostructure modified by the Bi quantum dots. The composite nanostructurehas larger specific surface area and can provide more active sites for photocatalytic reaction; meanwhile, the Bi quantum dots have quantum confinement effect and can directly reduce CO2 effectively.According to the Bi / Bi4V2O11 composite photocatalyst, a synergistic effect of Bi4V2O11 and Bi is utilized, so that the photoresponse range is expanded and the separation efficiency of photo-induced electron-hole pairs is improved; meanwhile, direct reaction between the Bi quantum dots and CO2 is used for improving conversion rate of the photocatalytic reduction of CO2; in addition, the compositematerial is simple in synthesis method and has broad prospects in the field of photocatalytic materials.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of photocatalytic materials, in particular to hollow cake-shaped Bi 4 V 2 o 11 and Bi quantum dots modified hollow pie Bi 4 V 2 o 11 Preparation method of composite material and its application in photocatalytic reduction of carbon dioxide. Background technique [0002] With the demand for energy in modern society, traditional fossil fuels are being consumed in large quantities, resulting in CO 2 massive emissions. rising CO 2 Concentration has led to the global greenhouse effect and destroyed the global carbon cycle balance law, so find effective ways to reduce CO in the air 2 Content attracts global attention. By photocatalysis, electrocatalysis, biological methods and other methods to convert CO 2 Converted into energy or other chemical fuels, it can not only solve the problem caused by CO 2 The greenhouse effect caused by it can alleviate the problem of energy sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22B01J35/10B01D53/86B01D53/62C01B32/40
CPCB01D53/8671C01B32/40B01J23/002B01J23/22B01D2257/504B01J35/60B01J35/61B01J35/39Y02A50/20
Inventor 陈立妙赵晓君段泽宇
Owner CENT SOUTH UNIV
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