Biomimetic synthesis method of bismuth vanadate visible-light-driven photocatalyst with different microtopographies

A biomimetic synthesis technology of bismuth vanadate with morphology, applied in vanadium compounds, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of no photoresponse and low utilization rate of sunlight, and achieve simple and fast operation, High visible photocatalytic activity and controllable product morphology

Inactive Publication Date: 2014-11-19
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But TiO 2 There are still some shortcomings that are difficult to overcome, such as the low utilization rate of sunlight, which can only absorb ultraviolet light accounting for 4% of the total energy of sunlight, and has almost no photoresponse in the visible light range.

Method used

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  • Biomimetic synthesis method of bismuth vanadate visible-light-driven photocatalyst with different microtopographies
  • Biomimetic synthesis method of bismuth vanadate visible-light-driven photocatalyst with different microtopographies
  • Biomimetic synthesis method of bismuth vanadate visible-light-driven photocatalyst with different microtopographies

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Weigh 0.25g of gelatin and dissolve it in 50mL of dilute nitric acid solution with a molar concentration of 1mol / L, wait for the gelatin to dissolve completely, add 1mmol Bi(NO 3 ) 3 ·5H 2O solid, after stirring for 1 h, add 1 mmol NH 4 VO 3 Powder, after stirring for another 30 minutes, adjust the pH of the solution to 1 with ammonia water, then stir for 40 minutes, transfer the precursor solution to a 80mL hydrothermal reactor and react at 180°C for 24 hours. After the reaction, take out the reactor and cool it to room temperature. Centrifuge the yellow precipitate generated by the reaction, wash it repeatedly with deionized water and absolute ethanol, and then put it in a vacuum oven and dry it at 60°C for 12 hours to obtain disc-shaped and columnar bismuth vanadate visible photocatalyst 1, and its scanning electron microscope image See figure 1 .

Embodiment 2

[0019] Weigh 0.25g of gelatin and dissolve it in 50mL of dilute nitric acid solution with a molar concentration of 1mol / L, wait for the gelatin to dissolve completely, add 1mmol Bi(NO 3 ) 3 ·5H 2 O solid, after stirring for 1 h, add 1 mmol NH 4 VO 3 After stirring for another 30 minutes, the pH of the solution was adjusted to 4 with ammonia water, and then after stirring for 40 minutes, the precursor solution was transferred to a 80mL hydrothermal reactor and reacted at 180°C for 24 hours. After the reaction, the reactor was taken out and cooled to room temperature. Centrifuge the yellow precipitate generated by the reaction, wash it repeatedly with deionized water and absolute ethanol, and then put it in a vacuum drying oven at 60 ° C for 12 hours to obtain a maple leaf-shaped bismuth vanadate visible photocatalyst 2. The scanning electron microscope picture is shown in figure 2 .

Embodiment 3

[0021] Weigh 0.25g of gelatin and dissolve it in 50mL of dilute nitric acid solution with a molar concentration of 1mol / L, wait for the gelatin to dissolve completely, add 1mmol Bi(NO 3 ) 3 ·5H 2 O solid, after stirring for 1 h, add 1 mmol NH 4 VO 3 Powder, after stirring for another 30 minutes, adjust the pH of the solution to 7 with ammonia water, then stir for 40 minutes, transfer the precursor solution to a 80mL hydrothermal reactor and react at 180°C for 24 hours. After the reaction, take out the reactor and cool it to room temperature. Centrifuge the yellow precipitate generated by the reaction, wash it repeatedly with deionized water and absolute ethanol, and then put it in a vacuum drying oven at 60°C for 12 hours to obtain the flaky bismuth vanadate visible photocatalyst 3. The scanning electron microscope picture is shown in image 3 .

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Abstract

The invention discloses a biomimetic synthesis method of a bismuth vanadate visible-light-driven photocatalyst with different microtopographies. The method comprises the following steps: dissolving 0.125-1 g of gelatin into 50 ml of dilute nitric acid solution with a molar concentration of 1 mol/L; after the gelatin is completely dissolved, adding 1 mmol of a Bi(NO3)3.5H2O solid, stirring for 1 h, adding 1 mmol of NH4VO3 powder, and stirring for 30 min; adjusting the pH value of the obtained solution to be 1-9 by using ammonium hydroxide; after stirring for 40 min, transferring a precursor solution to a hydrothermal reaction kettle with a volume of 80 ml to react for 24 h at a temperature of 120-180 DEG C; after the reaction is completed, taking the obtained product out of the reaction kettle and cooling to room temperature, carrying out centrifugal separation so as to obtain a yellow precipitate, and repeatedly washing the yellow precipitate by using deionized water and anhydrous ethanol; putting the obtained product into a drying oven to dry for 12 h at a temperature of 60 DEG C, so that the bismuth vanadate visible-light-driven photocatalyst with different microtopographies is prepared. According to the invention, synthesis in organic reagents or in mixed solvents of organic reagents and water is avoided, therefore, the biomimetic synthesis method is an environment-friendly synthesis method; the prepared bismuth vanadate visible-light-driven photocatalyst with different microtopographies has a high visible-light catalytic activity.

Description

technical field [0001] The invention belongs to the technical field of visible light catalytic materials, and in particular relates to a biomimetic synthesis method of bismuth vanadate visible light catalysts with different microscopic shapes. Background technique [0002] As an advanced oxidation technology, photocatalytic degradation of pollutants has great application prospects in environmental remediation and has received more and more attention. The photocatalyst is the core of this technology. Among many semiconductor photocatalysts, TiO 2 Due to its biological inertness, strong oxidation, low cost and high efficiency, resistance to light corrosion and chemical corrosion, and strong stability, it is considered to be the most suitable photocatalyst for environmental pollution control. But TiO 2 There are still some shortcomings that are difficult to overcome, such as the low utilization rate of sunlight, which can only absorb ultraviolet light accounting for 4% of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00B01J23/22C02F1/30
Inventor 邢新艳马玉雪任晓倩樊广燕李静丁慧芳杨林席国喜
Owner HENAN NORMAL UNIV
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