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Bismuth-phosphate-based composite photocatalytic material and preparation method thereof

A composite photocatalysis and bismuth phosphate technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of large forbidden band width and low utilization rate of sunlight, and improve absorption characteristics , Improve photocatalytic activity, and facilitate operation

Inactive Publication Date: 2015-03-25
SHAANXI UNIV OF SCI & TECH
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

In the past two years, studies involving bismuth phosphate photocatalysts have been reported, but this type of photocatalyst has a large band gap, can only be excited by ultraviolet light, and has a low utilization rate of sunlight.

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0025] The preparation method of the above-mentioned bismuth phosphate-based composite photocatalytic material specifically comprises the following steps:

[0026] Step 1: Dissolving bismuth nitrate pentahydrate in nitric acid solution with a mass concentration of 65% to obtain solution A, wherein the mass ratio of bismuth nitrate pentahydrate and nitric acid is 1:5-10; phosphate, ammonium tungstate and vanadium Ammonium acid is dissolved in a sodium hydroxide solution with a concentration of 1-2mol / L to obtain a solution B, wherein the molar ratio of phosphate ions, tungstate ions, vanadate ions and sodium hydroxide is 1:0.1-0.3:0.1-0.3 : 1 ~ 4; Mix solution A and solution B evenly to obtain solution C, wherein the molar ratio of phosphate ion, tungstate ion, vanadate ion and bismuth ion in solution C is 1: 0.1 ~ 0.3: 0.1 ~ 0.3: 1.3 ~1.9; add ammonium fluoride to solution C to obtain solution D, wherein the molar ratio of bismuth ions to ammonium fluoride is 1:0.5~1;

[0027...

Embodiment 1

[0031] Step 1: Dissolving 6.31g bismuth nitrate pentahydrate in 31.55g mass concentration of 65% nitric acid solution to obtain solution A; 1.64g sodium phosphate, 3.04g ammonium tungstate and 0.12g ammonium metavanadate were dissolved in 20ml, 1mol / L sodium hydroxide solution to obtain solution B; mix solution A and solution B uniformly to obtain solution C; add 0.48g of ammonium fluoride to solution C to obtain solution D;

[0032] Step 2: Transfer the solution D obtained in step 1 to a hydrothermal reaction kettle, and place it in a microwave reactor and heat it to 150° C. for microwave hydrothermal treatment for 1 hour. After taking it out, it is naturally cooled to room temperature, and the obtained product is centrifuged and removed. Washed with ion water for 3 times, dried at 80° C. for 12 hours to obtain a bismuth phosphate-based composite photocatalytic material.

[0033] The photodegradation experiment was carried out on the bismuth phosphate-based composite photocat...

Embodiment 2

[0035] Step 1: Dissolving 9.22g bismuth nitrate pentahydrate in 92.2g mass concentration of 65% nitric acid solution to obtain solution A; 2mol / L sodium hydroxide solution to obtain solution B; mix solution A and solution B uniformly to obtain solution C; add 0.7g ammonium fluoride to solution C to obtain solution D;

[0036] Step 2: Transfer the solution D obtained in step 1 to a hydrothermal reaction kettle, and place it in a microwave reactor and heat it up to 250°C for 3 hours for microwave hydrothermal treatment. After taking it out, it is naturally cooled to room temperature, and the obtained product is centrifuged, and removed. Washed with ion water for 3 times, dried at 80° C. for 12 hours to obtain a bismuth phosphate-based composite photocatalytic material.

[0037]The photodegradation experiment was carried out on the bismuth phosphate-based composite photocatalytic material prepared in Example 2, and methyl orange was selected as the target pollutant. 0.02g of the ...

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Abstract

The invention discloses a bismuth-phosphate-based composite photocatalytic material. The bismuth-phosphate-based composite photocatalytic material comprises fluorine-nitrogen-codoped bismuth phosphate, bismuth tungstate and bismuth vanadate at a molar ratio of 1 to (0.1-0.3) to (0.1-0.3). The invention further discloses a preparation method of the bismuth-phosphate-based composite photocatalytic material. The preparation method comprises the steps of dissolving bismuth nitrate pentahydrate in a nitric acid solution, adding a mixed solution of phosphate, ammonium tungstate, ammonium metavanadate and sodium hydroxide solution, and carrying out microwave hydrothermal reaction, centrifugation and drying, so as to obtain the bismuth-phosphate-based composite photocatalytic material. According to the bismuth-phosphate-based composite photocatalytic material, by virtue of codoping of nonmetal fluorine and nitrogen ions, the capacity for capturing electrons at an interface among three semiconductors including bismuth phosphate, bismuth tungstate and bismuth vanadate is effectively improved, and the migration efficiency of electron holes is increased; the three semiconductors are compounded at the interface and can form a heterogeneous structure, so that the separation of photon-generated carriers is effectively promoted, and the photocatalytic activity of a composite system is improved.

Description

technical field [0001] The invention belongs to the technical field of inorganic environment-friendly photocatalytic materials, and in particular relates to a bismuth phosphate-based composite photocatalytic material, and also relates to a preparation method of the composite photocatalytic material. Background technique [0002] The preparation and application of highly active photocatalytic materials with high quantum efficiency and the ability to fully utilize solar energy has become a hot topic of widespread concern and research in the fields of materials science, chemistry, energy and environmental science. The two key issues in the research of photocatalytic materials are to improve the activity of photocatalysts and to expand the absorption wavelength of photocatalysts. Therefore, the design ideas of all new photocatalytic systems are based on these two issues. Starting from this purpose At present, most of the new photocatalytic systems mainly focus on composite metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J27/186A62D3/17A62D101/26A62D101/28
Inventor 李军奇刘辉何选盟朱振峰
Owner SHAANXI UNIV OF SCI & TECH
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