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Preparation method for bismuth vanadate composite photocatalyst loaded with strontium ferrite

The technology of strontium ferrite and bismuth vanadate is applied in the field of preparation of bismuth vanadate composite photocatalyst, can solve the problems of low photocatalytic efficiency and recovery rate, etc., and achieve the effects of enriching categories, reducing costs, and simple process steps

Inactive Publication Date: 2014-01-01
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to target the existing BiVO 4 In order to solve the problem of low photocatalytic efficiency and recovery rate, a preparation method of bismuth vanadate composite photocatalyst supported by strontium ferrite is proposed. The preparation process is simple and the cost is low. High-efficiency photocatalytic reaction, easy recycling, and the recovered composite photocatalyst also has high photocatalytic performance, which is suitable for effectively degrading organic pollutants in aromatic heterocyclic dye wastewater

Method used

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  • Preparation method for bismuth vanadate composite photocatalyst loaded with strontium ferrite

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Embodiment 1

[0022] A kind of preparation method of the bismuth vanadate composite photocatalyst supported by strontium ferrite, its concrete steps are as follows:

[0023] (1) Preparation of bismuth vanadate solution

[0024] With Bi(NO 3 ) 3 ·5H 2 O and NH 4 VO 3 As raw material, tartaric acid (C 4 h 6 o 6 ) as complexing agent, using nitric acid and water as solvent, according to Bi(NO 3 ) 3 ·5H 2 The amount of species of O (mol): NH 4 VO 3 The amount of substance (mol): C 4 h 6 o 6 The amount of substance (mol) is a ratio of 1:1:2, Bi(NO 3 )3 ·5H 2 O and C 4 h 6 o 6 Add it into a reaction vessel filled with 2mol / L nitric acid solution and stir at constant temperature for 30min, then adjust the pH to 7.5 with ammonia water to obtain solution A, and mix NH 4 VO 3 Add it into hot water at 70°C and dissolve to obtain solution B. Mix the two solutions A and B, and stir at constant temperature for 30 minutes to obtain a bismuth vanadate solution.

[0025] (2) Preparati...

Embodiment 2

[0030] A kind of preparation method of the bismuth vanadate composite photocatalyst supported by strontium ferrite, with embodiment 1, wherein:

[0031] In step (1), with Bi(NO 3 ) 3 ·5H 2 The amount of species of O (mol): NH 4 VO 3 The amount of substance (mol): C 4 h 6 o 6 The amount of substance (mol) is a ratio of 1:1:1, Bi(NO 3 ) 3 ·5H 2 O and C 4 h 6 o 6 Add it into a reaction vessel filled with 3mol / L nitric acid solution and stir at constant temperature for 60min, then adjust pH=6 with ammonia water to obtain solution A, and mix NH 4 VO 3 Add it into hot water at 60°C to dissolve to obtain solution B. Mix the two solutions A and B, and stir at constant temperature for 45 minutes to obtain a bismuth vanadate solution.

[0032] The (2) step is the same as embodiment 1.

[0033] In step (3), m[BiVO 4 ]: m[SrFe 12 o 19 ]=100:5 strontium ferrite was added to the bismuth vanadate solution obtained above, and ultrasonically oscillated for 45 minutes to obta...

Embodiment 3

[0035] A kind of preparation method of the bismuth vanadate composite photocatalyst supported by strontium ferrite, with embodiment 1, wherein:

[0036] In step (1), with Bi(NO 3 ) 3 ·5H 2 The amount of species of O (mol): NH 4 VO 3 The amount of substance (mol): C 4 h 6 o 6 The amount of substance (mol) is a ratio of 1:1:3, Bi(NO 3 ) 3 ·5H 2 O and C 4 h 6 o 6 Add it into the reaction vessel filled with 4mol / L nitric acid solution and stir at constant temperature for 90min, then adjust the pH=5 with ammonia water to obtain solution A, mix NH 4 VO 3 Add it into hot water at 50°C to dissolve to obtain solution B. The two solutions A and B were mixed, and stirred at constant temperature for 60 minutes to obtain a bismuth vanadate solution.

[0037] The (2) step is the same as embodiment 1.

[0038] In step (3), m[BiVO 4 ]: m[SrFe 12 o 19 ] = 100:25 strontium ferrite, added to the bismuth vanadate solution obtained above, and ultrasonically oscillated for 60 min...

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Abstract

The invention relates to a preparation method for a bismuth vanadate composite photocatalyst loaded with strontium ferrite, and belongs to the field of inorganic catalytic materials. According to the preparation method, bismuth vanadate adopts the structure of scheelite in the monoclinic system; while the degradation rate, of the composite photocatalyst loaded with the strontium ferrite, for methylene blue can reach 93 percent in 5h, the degradation rate, of a similar composite photocatalyst of bismuth vanadate loaded with ferroferric oxide, for the methylene blue can reach 80 percent in 8 h. Moreover, the prepared composite photocatalyst has photocatalysis activity in relatively-wide wavelength range, and can efficiently and cyclically degrade organic pollutants in heteroaromatic dye-type wastewater under the irradiation of ultraviolet light, visible light and natural light through photocatalysis. Meanwhile, the composite catalyst is convenient to recover with the recovery rate not less than 92 percent; the degradation rate, of the recovered composite catalyst, for the methylene blue can reach 60 percent in 5h. The preparation method is simple and has an excellent application prospect.

Description

Technical field [0001] The invention relates to a preparation method of a strontium ferrite-supported bismuth vanadate composite photocatalyst, and belongs to the technical field of inorganic environmentally friendly photocatalytic materials. Background technique [0002] With the continuous development of mankind, environmental problems and energy crisis are major issues that human society is facing and urgently need to be solved. The use of photocatalysis to degrade environmental pollutants and improve energy recycling has the advantages of reacting at room temperature and directly using sunlight as a light source to drive oxidation-reduction reactions. It is an ideal environmental pollution control technology. Recent research results on visible light-responsive semiconductor photocatalysts are mainly divided into two categories. One is for TiO 2 Doping modification, doping TiO 2 It shows certain visible light catalytic activity, but its light absorption is weak and its...

Claims

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Application Information

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IPC IPC(8): B01J23/847A62D3/17A62D101/20
Inventor 刘成伦叶荷萍徐龙君谢太平廖婷
Owner CHONGQING UNIV
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