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In-situ doped type bismuth phosphate-cuprous oxide composite photocatalyst and preparation method thereof

A cuprous oxide, in-situ doping technology, used in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of large forbidden band width and low utilization of sunlight, and achieve improved The effect of absorption characteristics, improved capture capacity, and simple process

Inactive Publication Date: 2015-04-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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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Effect test

preparation example Construction

[0027] The preparation method of the above-mentioned in-situ doped bismuth phosphate-cuprous oxide composite photocatalyst specifically comprises the following steps:

[0028] 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 to nitric acid is 1:5-10; dissolving phosphate in water to obtain solution B , wherein the mass ratio of phosphate and water is 1:5-10; mix solution A and solution B uniformly to obtain solution C, wherein the molar ratio of bismuth ions and phosphate ions in solution C is 1:1; ammonium fluoride Add solution C to obtain solution D, wherein the molar ratio of bismuth ions to ammonium fluoride is 1:0.5~1; dissolve copper sulfate pentahydrate, pentapentyl alcohol and sodium hydroxide in water to obtain solution E, in which copper sulfate pentahydrate , pentapentyl alcohol, sodium hydroxide and water in a mass ratio of 1: 0.5 to ...

Embodiment 1

[0033] Step 1: Dissolve 4.85g of bismuth nitrate pentahydrate in 24.25g of nitric acid solution with a mass concentration of 65% to obtain solution A; dissolve 1.64g of sodium phosphate in 8.2g of water to obtain solution B; mix solution A and solution B evenly Obtain solution C; add 0.185g of ammonium fluoride to solution C to obtain solution D; dissolve 0.5g of copper sulfate pentahydrate, 0.25g of pentapentyl alcohol and 1.5g of sodium hydroxide in 15g of water to obtain solution E; Add to solution D, mix and stir evenly to obtain solution F;

[0034] Step 2: Transfer the solution F to a hydrothermal reaction kettle, and place it in a microwave reactor, heat it to 150°C for 1 hour, take it out and cool it to room temperature naturally, centrifuge the obtained product, and wash it with deionized water for 3 Second, dry at 80°C for 12 hours to obtain an in-situ doped bismuth phosphate-cuprous oxide composite photocatalyst.

[0035] The photodegradation experiment was carried...

Embodiment 2

[0037] Step 1: Dissolve 4.85g of bismuth nitrate pentahydrate in 48.5g of nitric acid solution with a mass concentration of 65% to obtain solution A; dissolve 1.64g of sodium phosphate in 16.4g of water to obtain solution B; mix solution A and solution B evenly Obtain solution C; add 0.37g ammonium fluoride to solution C to obtain solution D; dissolve 2.5g copper sulfate pentahydrate, 3.75g pentapentyl alcohol and 15g sodium hydroxide in 150g water to obtain solution E; add solution E dropwise In solution D, mix and stir evenly to obtain solution F;

[0038]Step 2: Transfer the solution F 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 washed with deionized water for 3 hours. Second, dry at 80°C for 12 hours to obtain an in-situ doped bismuth phosphate-cuprous oxide composit...

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Abstract

A disclosed in-situ doped type bismuth phosphate-cuprous oxide composite photocatalyst is composed of fluorine-nitrogen co-doped bismuth phosphate and cuprous oxide with the molar ratio of 1:0.2-1. The invention also discloses a preparation method for the photocatalyst. The preparation method comprises: dissolving bismuth nitrate pentahydrate in a nitric acid solution, then adding a phosphate solution and ammonic chloride, then adding a mixed solution of copper sulfate pentahydrate, xylitol and sodium hydroxide, stirring uniformly, and performing microwave hydrothermal reaction, centrifugation and drying to obtain the photocatalyst. Through co-doping of nonmetal fluorine and nitrogen ions, the in-situ doped type bismuth phosphate-cuprous oxide composite photocatalyst effectively improves the electron capture capability of a bismuth phosphate semiconductor at the interface and enhances the electron cavity migration efficiency. Through nonmetal ion co-doping, the oxygen cavity concentration in the bismuth phosphate semiconductor is increased, and further the photocatalytic activity of bismuth phosphate is improved.

Description

technical field [0001] The invention belongs to the technical field of inorganic environment-friendly photocatalytic materials, and specifically relates to an in-situ doped bismuth phosphate-cuprous oxide composite photocatalyst, and also relates to a preparation method of the composite photocatalyst. 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 met...

Claims

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Application Information

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IPC IPC(8): B01J27/186B01J27/24C02F1/30
Inventor 李军奇刘辉何选盟朱振峰
Owner SHAANXI UNIV OF SCI & TECH
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