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Preparation method and application of iron hydroxide/bismuth vanadate composite photocatalyst

A technology of iron hydroxide and bismuth vanadate, which is applied in the field of photocatalysis, can solve the problems of rare, expensive, and limited precious metal elements, and achieve the effects of low production cost, easy operation, and simple process

Active Publication Date: 2016-07-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

RuO 2 and IrO 2 Considered to be the best co-catalyst in the oxygen evolution reaction, but the rare and expensive characteristics of noble metal elements limit large-scale commercial energy production

Method used

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  • Preparation method and application of iron hydroxide/bismuth vanadate composite photocatalyst
  • Preparation method and application of iron hydroxide/bismuth vanadate composite photocatalyst
  • Preparation method and application of iron hydroxide/bismuth vanadate composite photocatalyst

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Experimental program
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Embodiment 1

[0035] Preparation of bismuth vanadate: Add bismuth chloride and ammonium metavanadate with a molar ratio of 1:1 into a beaker containing deionized water and mix evenly, add dropwise 1mol / L ethanolamine solution, the corresponding mole of ethanolamine and bismuth chloride The ratio is 400:1, and the precursor is obtained by mixing and stirring; the precursor is placed in the reactor, and BiVO is synthesized by hydrothermal method at 160 °C 4 , the bismuth vanadate was centrifugally settled, washed with distilled water and absolute ethanol, dried and ground to obtain yellow bismuth vanadate powder.

Embodiment 2

[0037] Preparation of bismuth vanadate: Add bismuth chloride and ammonium metavanadate with a molar ratio of 1:1 into a beaker containing deionized water and mix evenly, add dropwise 1mol / L ethanolamine solution, the corresponding mole of ethanolamine and bismuth chloride The ratio is 500:1, and the precursor is obtained by mixing and stirring; the precursor is placed in the reaction kettle, and BiVO is synthesized by hydrothermal method at 180°C 4 , the bismuth vanadate was centrifugally settled, washed with distilled water and absolute ethanol, dried and ground to obtain yellow bismuth vanadate powder.

[0038] Some crystal structure studies were performed on the bismuth vanadate product prepared by the method described above. figure 1 figure 2 XRD diffraction pattern and SEM pattern of bismuth vanadate under hydrothermal conditions at 160°C, a is the XRD diffraction pattern of bismuth vanadate prepared in the experiment, b is the diffraction pattern of #14-1688#PDF card. ...

Embodiment 3

[0040] Preparation of iron hydroxide / bismuth vanadate composite material: Mix yellow bismuth vanadate powder, urea, and distilled water evenly in a molar ratio of 1:40:4000, add concentrated nitric acid, concentrated nitric acid, and vanadic acid to the mixed solution drop by drop The molar mass ratio of bismuth is 1:7, which provides an acidic environment and prevents Fe 3+hydrolysis. Then add ferric nitrate nonahydrate solution, so that the molar ratio of iron and bismuth vanadate is 0.01:1; heat in an oil bath at 80°C for 4h, and react under stirring conditions. Let the heated liquid stand for 30 minutes. Pour off the supernatant, divide the yellow powder at the bottom into centrifuge tubes, add deionized water, oscillate evenly and put it in the centrifuge for centrifugation (centrifuge at 9000r / min for 5min), pour off the supernatant, and repeat the above steps , washed 4 times with water, and washed 4 times with alcohol at the same time to obtain a yellow precipitate. ...

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Abstract

The invention relates to a preparation method and an application of an iron hydroxide / bismuth vanadate composite photocatalyst. Bismuth vanadate and a composite photocatalyst thereof are prepared with a hydrothermal method; the obtained bismuth vanadate powder adopts a flaky monoclinic structure phase. A template and an organic surfactant are not used, the bismuth vanadate powder in a flaky structure can be obtained by controlling the dosage of ethanolamine, and the supporting amount of iron hydroxide on bismuth vanadate can be controlled by controlling the mass ratio of bismuth vanadate to an iron salt aqueous solution; when the composite photocatalyst is applied to photocatalytic water splitting for oxygen generation, iron hydroxide and bismuth vanadate overcome the defect of high probability of recombination of photon-generated carriers of bismuth vanadate due to different conduction band positions and different valance band positions, and the composite photocatalyst has high photocatalytic water splitting activity for oxygen generation. Further, a preparation process is simple and convenient, the production cost is lower, the actual production requirement is met, and the process is simple and easy to operate.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, and relates to a preparation method and application of an iron hydroxide / bismuth vanadate composite photocatalyst. Background technique [0002] Myrvanadate is an environmentally friendly pigment with excellent performance, and it also has the functions of photolyzing water and degrading organic pollutants. It has three different crystal forms of tetragonal zirconium silicate type, tetragonal scheelite type and monoclinic scheelite type, so its properties are also different. Studies have shown that bismuth vanadate with a monoclinic structure has a narrow band gap (2.4eV) and strong oxidation ability, can absorb a large amount of visible spectrum, can use more energy from sunlight, and has the strongest photocatalytic activity. The application value is the highest. Adopt hydrothermal method to synthesize the BiVO of monoclinic structure in the present invention 4 , does not use any temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847C25B11/06C25B1/04
CPCC25B1/04C25B11/04B01J23/8472B01J35/39Y02E60/36
Inventor 刘乐全刘敏叶金花王德法刘明阳
Owner TIANJIN UNIV
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