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Co-doped bismuth phosphate-base composite photocatalytic material and preparation method thereof

A composite photocatalysis and bismuth phosphate technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of low utilization of sunlight and large forbidden band width, etc., to improve photocatalysis Activity, improve absorption properties, enhance the effect of migration efficiency

Active Publication Date: 2015-04-01
陕西万华环境工程有限公司
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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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preparation example Construction

[0023] The preparation method of the above-mentioned co-doped bismuth phosphate-based composite 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 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; transfer solution C to a hydrothermal reaction kettle, and place it in a microwave reactor and heat it to 150~250°C for 1~3h with ...

Embodiment 1

[0029] Step 1: Dissolving 6.31g bismuth nitrate pentahydrate in 31.55g mass concentration is 65% nitric acid solution to obtain solution A. Dissolve 1.64g sodium phosphate, 3.04g ammonium tungstate and 0.12g ammonium metavanadate in 20ml, concentration It is a 1mol / L sodium hydroxide solution to obtain solution B; mix solution A and solution B evenly to obtain solution C; transfer solution C to a hydrothermal reaction kettle, and place it in a microwave reactor and heat it to 150°C by microwave Hydrothermal treatment for 1 hour, take it out and cool it to room temperature naturally, centrifuge the obtained product, wash with deionized water 3 times, and dry at 80°C for 12 hours to obtain a mixed powder of bismuth phosphate, bismuth tungstate and bismuth vanadate;

[0030] Step 2: Disperse 3.85g of the mixed powder obtained in step 1 in 65ml of ammonium fluoride solution with a concentration of 0.1mol / L, then transfer to a hydrothermal reaction kettle, and place it in a microwav...

Embodiment 2

[0033]Step 1: Dissolving 9.22g bismuth nitrate pentahydrate in 92.2g mass concentration of 65% nitric acid solution to obtain solution A, 1.64g sodium phosphate, 9.12g ammonium tungstate and 0.36g ammonium metavanadate were dissolved in 20ml, concentration 2mol / L sodium hydroxide solution to obtain solution B; mix solution A and solution B evenly to obtain solution C; transfer solution C to a hydrothermal reaction kettle, and place it in a microwave reactor and heat it to 250°C with microwaves After hydrothermal treatment for 3 hours, take it out and cool it down to room temperature naturally, centrifuge the obtained product, wash it with deionized water three times, and dry it at 80°C for 12 hours to obtain a mixed powder of bismuth phosphate, bismuth tungstate and bismuth vanadate;

[0034] Step 2: Disperse 3.85g of the mixed powder obtained in step 1 in 13ml of ammonium fluoride solution with a concentration of 1mol / L, then transfer it to a hydrothermal reaction kettle, and ...

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PUM

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Abstract

A disclosed co-doped bismuth phosphate-base composite photocatalytic material is composed of fluorine-nitrogen co-doped bismuth phosphate, bismuth tungstate and bismuth vanadium oxide, and the molar ratio of fluorine-nitrogen co-doped bismuth phosphate, bismuth tungstate and bismuth vanadium oxide is 1:0.1-0.3:0.1-0.3. The invention also discloses a preparation method of the material. The preparation method comprises: performing microwave hydrothermal reaction on bismuth nitrate pentahydrate, a phosphate, ammonium tungstate and ammonium metavanadate to obtain a mixed powder, then adding ammonium chloride and performing microwave hydrothermal reaction again, and centrifuging and drying to obtain the material. The co-doped bismuth phosphate-base composite photocatalytic material effectively improves the electron capture capability of the three semiconductors bismuth phosphate, bismuth tungstate and bismuth vanadium oxide at the interfaces through co-doping of nonmetal fluorine and nitrogen ions, and enhances the electron cavity migration efficiency. The three semiconductors bismuth phosphate, bismuth tungstate and bismuth vanadium oxide can form a heterostructure at the interfaces, separation of photocarriers is effectively facilitated, and further the photocatalytic activity of the 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 co-doped 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 compos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J27/199C02F1/30
Inventor 李军奇刘辉何选盟朱振峰
Owner 陕西万华环境工程有限公司
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