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Bismuth molybdate composite photocatalytic material and preparation method thereof

A technology of composite photocatalysis and bismuth molybdate is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., to achieve the effects of improving migration efficiency, low cost and mild reaction conditions

Inactive Publication Date: 2016-05-11
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a bismuth molybdate composite photocatalytic material, which solves the problem that the existing ones are all based on improving the transmission rate of photogenerated electrons, but by increasing the migration rate of photogenerated holes to improve the separation of photogenerated carriers Efficiency is neglected

Method used

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preparation example Construction

[0021] The preparation method of the above-mentioned bismuth molybdate composite photocatalytic material is specifically implemented according to the following steps:

[0022] Step 1, mix hexagonal boron nitride powder, sodium nitrate and concentrated sulfuric acid according to the mass ratio of 1:0.5~1:30~60, put them in an ice-water bath and stir evenly, add potassium permanganate and continue stirring for 8~24h , the mass ratio of hexagonal boron nitride powder and potassium permanganate is 1:0.5~1, then add hydrogen peroxide (the mass ratio of potassium permanganate and hydrogen peroxide is 1:8~16) and continue stirring for 0.5~1h. Centrifuge at 3000rpm for 10min, filter the upper suspension with microporous suction, wash with deionized water until neutral, and dry to obtain boron nitride nanosheets;

[0023] Step 2, dissolving bismuth nitrate pentahydrate in a nitric acid solution with a concentration of 10%, the mass ratio of bismuth nitrate pentahydrate and nitric acid ...

Embodiment 1

[0025] Step 1, mix 1g of hexagonal boron nitride powder, 0.5g of sodium nitrate and 30g of concentrated sulfuric acid, mix them in an ice-water bath and stir evenly, add 0.5g of potassium permanganate and continue to stir for 8 hours, then add 4g of hydrogen peroxide to continue to stir for reaction After 0.5h, centrifuge at 3000rpm for 10min, filter the upper suspension with microporous suction, wash with deionized water until neutral, and dry at 60°C for 12h to obtain boron nitride nanosheets;

[0026] 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 0.09g of ammonium paramolybdate to obtain a mixed solution, ultrasonically stirring the mixed solution, and transferring Put it in a hydrothermal reaction kettle, heat it in an oven to 120°C for hydrothermal treatment for 5 hours, then cool it down to room temperature naturally, finally centrifuge and wash it, and dry it at 80°C for 12...

Embodiment 2

[0028] Step 1, mix 1g of hexagonal boron nitride powder, 1g of sodium nitrate and 60g of concentrated sulfuric acid, put them in an ice-water bath and stir evenly, add 1g of potassium permanganate and continue stirring for 24 hours, then add 16g of hydrogen peroxide and continue stirring for 1 hour Centrifuge at 3000rpm for 10min, filter the upper suspension with microporous suction, wash with deionized water until neutral, and dry at 60°C for 12h to obtain boron nitride nanosheets;

[0029] 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 5.29g of ammonium paramolybdate to obtain a mixed solution, ultrasonically stirring the mixed solution, and transferring to A hydrothermal reaction kettle was placed in an oven and heated to 220°C for hydrothermal treatment for 30 hours, then naturally cooled to room temperature, finally centrifuged and washed, and dried at 80°C for 12 hours to obt...

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Abstract

The invention discloses a bismuth molybdate composite photocatalytic material. A boron nitride nanosheet serves as a catalyst carrier, and the boron nitride nanosheet is loaded with bismuth molybdate, wherein the molar ratio of the boron nitride nanosheet to bismuth molybdate is 1: (0.01-0.6). The invention further discloses a preparation method of the bismuth molybdate composite photocatalytic material. Bismuth nitrate pentahydrate is dissolved in a nitric acid solution with the concentration being 10%, then the boron nitride nanosheet and ammonium heptamolybdate are added, a mixed solution is obtained, the mixed solution is evenly stirred in an ultrasonic mode, transferred into a hydrothermal reaction kettle and placed in an oven to be subjected to a hydrothermal reaction, then the product is naturally cooled to room temperature, finally, centrifugal separating, washing and dying are performed, and the bismuth molybdate composite photocatalytic material is obtained. The composite photocatalytic material has certain electronegativity because of nitrogen vacancy on the surface of the boron nitride nanosheet, photogenerated holes, formed after illumination stimulation, of a bismuth molybdate valence band are absorbed so that migration of the holes can be promoted, and therefore the migration efficiency of photon-generated carriers is improved; besides, the large specific surface area of the boron nitride nanosheet is favorable for improvement of the adsorption performance of a composite system.

Description

technical field [0001] The invention belongs to the technical field of inorganic environment-friendly catalytic materials, in particular to a bismuth molybdate composite photocatalytic material, and also relates to a preparation method of the composite photocatalytic 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 recombination i...

Claims

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Application Information

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IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/39
Inventor 李军奇刘辉何选盟朱振峰
Owner SHAANXI UNIV OF SCI & TECH
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