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Synthetic method for high-activity N-F co-doped bismuth vanadate visible light photocatalytic material

The technology of a photocatalytic material and a synthesis method is applied in the field of preparing N-F co-doped bismuth vanadate photocatalytic material, which can solve the problems of low visible light catalytic efficiency and the like, and achieve the effects of cheap and easy-to-obtain raw materials, good dispersibility and good degradation effect.

Inactive Publication Date: 2013-10-30
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of N-F co-doped bismuth vanadate 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

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  • Synthetic method for high-activity N-F co-doped bismuth vanadate visible light photocatalytic material
  • Synthetic method for high-activity N-F co-doped bismuth vanadate visible light photocatalytic material
  • Synthetic method for high-activity N-F co-doped bismuth vanadate visible light photocatalytic material

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Experimental program
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Embodiment 1

[0027] The preparation method of the bismuth vanadate of the present embodiment may further comprise the steps:

[0028] 1) With a mass percentage of 97% Bi(NO 3 ) 3 ·5H 2 O, 98.5% NH 4 VO 3 As the source material, citric acid with a mass percentage of 99.5% was used as a chelating agent, and 4.8580 g (0.01 mol) of Bi(NO 3 ) 3 ·5H 2 O and 4.2028 g (0.02 mol) 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 6-7 with ammonia water, keep stirring at 80 °C, evaporate, and finally obtain the dark blue bismuth vanadate precursor sol.

[0029] 2) The dried bismuth vanadate precursor sol was put i...

Embodiment 2

[0033] 1) With a mass percentage of 97% Bi(NO 3 ) 3 ·5H 2 O, 98.5% NH 4 VO 3 As the source material, citric acid with a mass percentage of 99.5% was used as a chelating agent, and 4.8580 g (0.01 mol) of Bi(NO 3 ) 3 ·5H 2 O and 4.2028 g (0.02 mol) 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 to obtain A solution; weigh 0.01 mol, 1.1698 g of NH with 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), dissolved in 50mL boiling distilled water to obtain liquid B; mix liquid A and liquid B according to the molar ratio of Bi:V=1:1, and 4 The molar ratio of F to Bi is 2% and NH is added 4 F in the mixed solution, and then adjust the pH value to 6-7 with ammonia water, continue to stir at 80 ° C, evaporate, and finally obtain the dark blue bismuth vanadate precursor sol.

[0034] 2) The dried bismuth vanadate precursor sol was put into a muffle furna...

Embodiment 3

[0038] According to the preparation method of the present invention of embodiment 2, different conditions are: NH 4 The molar ratio of F and Bi is changed to 4%, and the bismuth vanadate photocatalytic material of 4% N-F is prepared, and the UV-vis spectrum of the obtained product is shown in figure 1 (c), BiVO synthesized in this example 4 The optical absorption threshold of 556nm, the forbidden band width is 2.23 eV. figure 2 (c) is the XRD pattern of the product, the BiVO synthesized in this example 4 at 18.7 o , 28.8 o , 30.5 o , 34.5 o , 35.1 o , 37.8 o , 39.8 o , 42.4 o , 47.2 o , 53.2 o , 59.8 o , 63.6 o , 69.3 o 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 310.33 nm 3 .

[0039] The photocatalytic performance of the synthesized bismuth vanadate was detected according to the method described in Example 1, an...

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Abstract

The invention discloses a synthetic method for high-activity N-F co-doped bismuth vanadate visible light photocatalytic material prepared through the citric acid complexation sol-gel method and a preparation process. The method employs Bi(NO3)3.5H2O(97%) and NH4VO3(98.5%) as source materials, citric acid(99.5%) as a chelating agent, NH4F as N and F sources, and utilizes ammonium hydroxide to regulate the pH value, and dark blue sol is prepared, dried, calcined to obtain the N-F co-doped bismuth vanadate photocatalytic material. When the material is compared to bismuth vanadate without being doped, because of the synergistic effects of N and F, oxygen vacancies and V4+ with catalytic activity are increased N-F co-doped bismuth vanadate crystals, the band-gap energy is narrower and the photocatalytic activity is raised obviously in visible light. The method is advantaged by simple process, mild conditions and good repeatability. The photocatalytic material can be widely used in photocatalytic degradation of organic pollutants, and has wide application prospects in environmental governance.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control and relates to a method for preparing an N-F co-doped bismuth vanadate photocatalytic material by a citric acid complex sol-gel method. Background technique [0002] With the development of modern industry, especially the organic chemical industry and printing and dyeing industry, the environmental pollution of human living is increasing day by day. For some high-concentration and refractory organic wastewater, it is difficult to achieve ideal results by using traditional biochemical and chemical treatment methods. The photocatalytic oxidation method has become one of the most promising methods in the treatment of organic wastewater due to its universality in degrading various organic and inorganic pollutants, energy saving and no secondary pollution. Semiconductor photocatalyst technology, in which TiO 2 is one of the most widely studied photocatalysts, but due to TiO 2...

Claims

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Application Information

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IPC IPC(8): B01J23/22C02F1/30
CPCY02W10/37
Inventor 王敏张东刘琼
Owner SHENYANG LIGONG UNIV
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