Bismuth vanadate modified boron nitride nanosheet composite material and preparation method thereof

A composite material, boron nitride technology, applied in the field of inorganic environmental protection catalytic materials, to achieve the effect of increasing adsorption performance, simple process and mild reaction conditions

Inactive Publication Date: 2016-06-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a bismuth vanadate modified boron nitride nanosheet composite material, which solves the problem that the existing ones are all based on improving

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1, mix 1g of hexagonal boron nitride powder, 0.5g of sodium nitrate and 30g of concentrated sulfuric acid and place in an ice-water bath to stir evenly to obtain a suspension, slowly add 0.5g of potassium permanganate to the suspension, and continue to stir for reaction After 8 hours, add 4g of hydrogen peroxide and continue to stir for 0.5 hours. After the reaction, centrifuge the suspension at 3000rpm for 10 minutes, filter the upper suspension with microporous suction, wash with deionized water until neutral, and dry at 60°C for 12 hours to obtain nitrogen. boron nanosheets;

[0025] Step 2, dissolving 0.49g of bismuth nitrate pentahydrate in 19.6g of 10% nitric acid solution, then adding 2.48g of boron nitride nanosheets and 0.12g of sodium metavanadate to obtain a mixed solution, and ultrasonically stirring the mixed solution at 80 °C in a water bath and evaporated to dryness; then placed in a muffle furnace for 0.5 h at 300 °C to obtain a bismuth vanadate-mod...

Embodiment 2

[0027] Step 1, mix 1g of hexagonal boron nitride powder, 1g of sodium nitrate and 60g of concentrated sulfuric acid and place in an ice-water bath to stir evenly to obtain a suspension, slowly add 1g of potassium permanganate to the suspension, and continue stirring for 24 hours Add 16g of hydrogen peroxide and continue to stir for 1 hour. After the reaction, centrifuge the suspension at 3000rpm for 10 minutes. Filter the upper suspension with microporous suction, wash with deionized water until neutral, and dry at 60°C for 12 hours to obtain boron nitride nanoparticles. piece;

[0028] Step 2, dissolving 29.1g of bismuth nitrate pentahydrate in 2910g of 10% nitric acid solution, then adding 2.48g of boron nitride nanosheets and 7.32g of sodium metavanadate to obtain a mixed solution, and ultrasonically stirring the mixed solution at 100°C Evaporate to dryness in a water bath; then place it in a muffle furnace for 5 hours at 600° C. to obtain a bismuth vanadate-modified boron ...

Embodiment 3

[0030] Step 1, mix 1g of hexagonal boron nitride powder, 0.5g of sodium nitrate and 30g of concentrated sulfuric acid and place in an ice-water bath to stir evenly to obtain a suspension, slowly add 0.5g of potassium permanganate to the suspension, and continue to stir for reaction After 8 hours, add 4g of hydrogen peroxide and continue to stir for 0.5 hours. After the reaction, centrifuge the suspension at 3000rpm for 10 minutes, filter the upper suspension with microporous suction, wash with deionized water until neutral, and dry at 60°C for 12 hours to obtain nitrogen. boron nanosheets;

[0031] Step 2, dissolving 29.1g of bismuth nitrate pentahydrate in 2910g of 10% nitric acid solution, then adding 2.48g of boron nitride nanosheets and 7.32g of sodium metavanadate to obtain a mixed solution, and ultrasonically stirring the mixed solution at 100°C Evaporate to dryness in a water bath; then place it in a muffle furnace for 5 hours at 600° C. to obtain a bismuth vanadate-mod...

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PUM

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Abstract

The invention discloses a bismuth vanadate-modified boron nitride nanosheet composite material, which uses boron nitride nanosheets as a catalyst carrier, and bismuth vanadate is loaded on the boron nitride nanosheets, wherein the boron nitride nanosheets and bismuth vanadate The molar ratio is 1:0.01~0.6. The invention also discloses its preparation method, dissolving bismuth nitrate pentahydrate in nitric acid solution with a concentration of 10%, then adding boron nitride nanosheets and sodium metavanadate to obtain a mixed solution, stirring the mixed solution evenly by ultrasonic, and evaporating to dryness in a water bath ; Then place it in a muffle furnace for processing. The composite material of the present invention uses the nitrogen vacancies existing on the surface of boron nitride nanosheets to cause it to have a certain electronegativity, attracts the photogenerated holes in the valence band of bismuth vanadate after excitation by light to promote the migration of holes, and then improves the photogenerated load. In addition, the large specific surface area of ​​boron nitride nanosheets is conducive to increasing the adsorption performance of the composite system, which is beneficial to the improvement of photocatalytic efficiency.

Description

technical field [0001] The invention belongs to the technical field of inorganic environment-friendly catalytic materials, and specifically relates to a bismuth vanadate-modified boron nitride nanosheet composite material, and also relates to a preparation method of the composite material. Background technique [0002] Semiconductor photocatalytic technology has attracted increasing attention due to its high efficiency, and is used to solve environmental pollution problems and convert solar energy. The selection of high-efficiency photocatalysts is the most important aspect of semiconductor photocatalysis technology. At present, there are about 200 kinds of semiconductors that can be used for photocatalytic reactions. However, low quantum efficiency and serious photocorrosion phenomenon affect most photocatalysts. Applications. Therefore, how to improve the separation efficiency of photogenerated electrons and holes in semiconductor photocatalysts to suppress their rapid re...

Claims

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Application Information

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IPC IPC(8): B01J27/24B82Y30/00
CPCB01J27/24B01J35/004B82Y30/00
Inventor 李军奇刘辉何选盟朱振峰
Owner SHAANXI UNIV OF SCI & TECH
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