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Fluorine-nitrogen co-doped bismuth phosphate- cuprous oxide photocatalytic material and preparation method thereof

A photocatalytic material, cuprous oxide technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of low utilization rate of sunlight, large forbidden band width, etc. ability, improve absorption characteristics, promote separation effect

Inactive Publication Date: 2015-03-11
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

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The preparation method of the above-mentioned fluorine and nitrogen co-doped bismuth phosphate-cuprous oxide photocatalytic material specifically comprises the following steps:

[0024] 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, in which the molar ratio of bismuth ions and ammonium fluoride is 1:0.5~1; transfer solution D to a hydrothermal reaction kettle, and place it in a microwave reactor and heat it to 150~250°C by microwave Microwave hydrothermal treatment for 1 to 3 hours, take it out and cool it dow...

Embodiment 1

[0029] 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 Solution C was obtained; 0.185g of ammonium fluoride was added to solution C to obtain solution D; solution D was transferred to a hydrothermal reaction kettle, and placed in a microwave reactor, heated to 150°C by microwave for microwave hydrothermal treatment for 1 hour, and cooled naturally after taking it out After reaching room temperature, the obtained product was centrifuged, washed three times with deionized water, and dried at 80°C for 12 hours to obtain fluorine and nitrogen co-doped bismuth phosphate powder;

[0030] Step 2: the fluorine, nitrogen co-doped bismuth phosphate powder that 3.04g step 1 obtains is dispersed in the copper chloride dihydrate solution that 200ml concentration is 0.01mol / L, obtains sus...

Embodiment 2

[0033] 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 Solution C was obtained; 0.375g of ammonium fluoride was added to solution C to obtain solution D; solution D was transferred to a hydrothermal reaction kettle, and placed in a microwave reactor to be heated to 250°C for 3 hours by microwave hydrothermal treatment, and then cooled naturally after taking it out After reaching room temperature, the obtained product was centrifuged, washed three times with deionized water, and dried at 80°C for 12 hours to obtain fluorine and nitrogen co-doped bismuth phosphate powder;

[0034] Step 2: the fluorine that 3.04g step 1 obtains, nitrogen co-doped bismuth phosphate powder are dispersed in the copper chloride dihydrate solution that 100ml concentration is 0.1mol / L, obtain suspens...

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Abstract

A disclosed fluorine-nitrogen co-doped bismuth phosphate-cuprous oxide photocatalytic material is composed of fluorine-nitrogen co-doped bismuth phosphate and cuprous oxide, wherein the molar ratio of fluorine-nitrogen co-doped bismuth phosphate to cuprous oxide is 1:0.2-1. A disclosed preparation method for the composite photocatalyst comprises: dispersing a fluorine-nitrogen co-doped bismuth phosphate powder in copper(II) chloride dihydrate, then dropwise adding polyvinylpyrrolidone and a sodium hydroxide solution, then adding an L-ascorbic acid solution, transferring to a hydrothermal reaction kettle to perform microwave hydrothermal processing, and naturally cooling to room temperature, and performing centrifugal separation, washing and drying on the obtained product, so as to obtain the composite photocatalyst. Through co-doping of nonmetal fluorine and nitrogen ions, the electron capturing capability on the interface of a bismuth phosphate semiconductor is effectively improved, the electron cavity migration efficiency is enhanced, and the oxygen vacancy concentration in the bismuth phosphate semiconductor is increased, and thus 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 a fluorine and nitrogen co-doped bismuth phosphate-cuprous oxide photocatalytic material, and the invention also relates to a preparation method of the 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...

Claims

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Application Information

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