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Preparation method of bismuth vanadate visible light photocatalysis material

A photocatalytic material, bismuth vanadate technology, applied in the field of environmental pollution control, can solve the problem of low catalytic efficiency of visible light, achieve good degradation effect, easy to obtain and cheap raw materials

Inactive Publication Date: 2012-10-17
SHENYANG LIGONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a bismuth vanadate visible light photocatalytic material with simple preparation process, easy operation, low cost and equipment requirements for the low visible light catalytic efficiency of bismuth vanadate photocatalytic material and the deficiency of existing modification technology The preparation method, the photocatalyst obtained by this method has high visible light catalytic activity, and can quickly degrade organic pollutants in dye wastewater

Method used

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  • Preparation method of bismuth vanadate visible light photocatalysis material
  • Preparation method of bismuth vanadate visible light photocatalysis material
  • Preparation method of bismuth vanadate visible light photocatalysis material

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Embodiment 1

[0026] The preparation method of the bismuth vanadate of the present embodiment may further comprise the steps:

[0027] 1) Take Bi(NO 3 ) 3 ·5H 2 O (97%), NH 4 VO 3 (98.5%) as the source material and citric acid (99.5%) as the chelating agent. Weigh 0.01 mol, 4.8580 g of Bi(NO 3 ) 3 ·5H 2 O and 0.02 mol, 4.2028 g of citric acid monohydrate (C 6 h 8 o 7 ·H 2 O), add citric acid monohydrate to 50mL Bi(NO 3 ) 3 ·5H 2 O solution, A solution was obtained. Weigh 0.01 mol, 1.1698 g of NH at a molar ratio of 1:2 4 VO 3 and 0.02 mol, 4.2028 g of citric acid monohydrate (C 6 h 8 o 7 ·H 2 O), solution B dissolved in 50 mL of boiling distilled water. Mix liquid A and liquid B according to the molar ratio of Bi:V=1:1, adjust the pH value to about 6.5 with ammonia water, keep stirring at 80 ℃, evaporate, and finally obtain the dark blue bismuth vanadate precursor sol.

[0028] 2) The dried bismuth vanadate precursor sol was put into a muffle furnace and calcined at 500°...

Embodiment 2

[0033] With Bi(NO 3 ) 3 ·5H 2 O (97%), NH 4 VO 3 (98.5%) as the source material and citric acid (99.5%) as the chelating agent. Weigh 0.01 mol, 4.8580 g of Bi(NO 3 ) 3 ·5H 2 O and 0.02 mol, 4.2028 g of citric acid monohydrate (C 6 h 8 o 7 ·H 2 O), add citric acid monohydrate to 50mL Bi(NO 3 ) 3 ·5H 2 O solution, A solution was obtained. Weigh 0.01 mol, 1.1698 g of NH at a molar ratio of 1:2 4 VO 3 and 0.02 mol, 4.2028 g of citric acid monohydrate (C 6 h 8 o 7 ·H 2 O), solution B dissolved in 50 mL of boiling distilled water. Mix liquid A and liquid B according to Bi:V=1:1 molar ratio, according to Eu 3+ with Bi 3+ The molar ratio is 0.1% adding Eu(NO 3 ) 3 In the mixed solution, adjust the pH value to about 6.5 with ammonia water, continue to stir at 80 ° C, evaporate, and finally obtain a dark blue bismuth vanadate precursor sol.

[0034] 2) Put the dried bismuth vanadate precursor sol into a muffle furnace and calcinate at 500°C for 5 hours to obtain...

Embodiment 3

[0038] According to the preparation method of the present invention of embodiment 2, only the Eu in embodiment 2 3+ with Bi 3+ The molar ratio was changed to 0.2%, and 0.1% Eu was prepared 3+ Doped bismuth vanadate photocatalytic material. The UV-vis spectrum of the product obtained is shown in figure 1 (c), BiVO synthesized in this example 4 The optical absorption threshold of 556nm, the forbidden band width is 2.19 eV. figure 2 (c) is the XRD pattern of the product, the BiVO synthesized in this example 4 at 18.7 0 , 28.8 0 , 30.5 0 , 34.5 0 , 35.1 0 , 37.8 0 , 39.8 0 , 42.4 0 , 47.2 0 , 53.2 0 , 59.8 0 , 63.6 0 , 69.3 0 The diffraction peak at the position is the characteristic peak of monoclinic bismuth vanadate, but the characteristic peak is obviously shifted to a small angle, and the unit cell volume is 310.85 nm 3 . image 3 (b) is the SEM image of the product. It can be seen from the image that some particles in the generated product sample are re...

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Abstract

The invention discloses a method for synthesizing a Eu<3+>-doped BiVO4 visible light photocatalysis material by using a citric acid complexed sol-gel method. The preparation method is simple, and the visible light activity of the obtained photocatalyst is high. According to the invention, Bi(NO3)3.5H2O (97%) and NH4VO3 (98.5%) are adopted as source materials; citric acid (99.5%) is adopted as a chelating agent; Eu(NO3)3 is adopted as a doping source material; the pH value is regulated by using ammonia water, and a deep blue sol is prepared; the sol is dried by baking, and is calcined for 5h under the temperature of 500 DEG C, such that the Eu<3+>-doped bismuth vanadate photocatalysis material is obtained. Compared with non-doped bismuth vanadate, oxygen vacancies and V<4+> with catalytic activities in the Eu<3+>-doped bismuth vanadate crystals are increased. After doping, red shift occurs in the light absorption performance of the sample, the band gap can be narrowed, such that the visible light photocatalytic activity is substantially improved. The method provided by the invention is advantaged in simple process, mild condition, and good repeatability. The method can be widely applied in photocatalytic degradation of organic pollutants, and has a good application prospect in environment treatment.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control, and relates to a preparation method of a bismuth vanadate visible light photocatalytic material. Background technique [0002] With the continuous development of human beings, the control and treatment of environmental pollution is a major issue that human society faces and urgently needs to be solved. Among many environmental pollution control technologies, the heterogeneous photocatalytic process using semiconductors as catalysts has become an ideal environment due to its advantages of reacting at room temperature and directly using sunlight as a light source to drive oxidation-reduction reactions. pollution control technology. BiVO 4 As a new type of semiconductor photocatalytic material, due to its narrow band gap (about 2.4eV), the wavelength response range extends to about 520nm, stable photochemical performance, strong redox ability, non-toxic, cheap and other adv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22C02F1/30
Inventor 王敏姜承志刘琼车寅生
Owner SHENYANG LIGONG UNIV
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