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Biomimetic synthesis method of bismuth vanadate visible-light photocatalyst having hierarchical structure

A technology of hierarchical structure and biomimetic synthesis, applied in the field of photocatalysis, can solve the problems of no light response and low utilization rate of sunlight, and achieve the effects of simple and fast operation, uniform distribution and high visible light catalytic activity.

Inactive Publication Date: 2014-07-30
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 photocatalyst having hierarchical structure
  • Biomimetic synthesis method of bismuth vanadate visible-light photocatalyst having hierarchical structure
  • Biomimetic synthesis method of bismuth vanadate visible-light photocatalyst having hierarchical structure

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Experimental program
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Embodiment 1

[0011] Dissolve 0.685g of soluble starch in 50ml of nitric acid solution with a molar concentration of 1mol / L, stir evenly, add 1mmol of bismuth nitrate, and continue stirring for 2h to obtain a mixed solution; add 1mmol of ammonium metavanadate to the mixed solution, and stir for 0.5 h, use ammonia water to adjust the pH of the system to 1, continue to stir for 0.5h, transfer to a hydrothermal reaction kettle for 24h at 180°C for hydrothermal reaction, centrifuge, wash, and vacuum dry at 60°C to obtain figure 1 Bismuth vanadate visible photocatalyst 1 is shown as a hollow twin sphere, which is a hierarchical structure composed of smaller particles.

Embodiment 2

[0013] Dissolve 0.685g of soluble starch in 50ml of nitric acid solution with a molar concentration of 1mol / L, stir evenly, add 1mmol of bismuth nitrate, and continue stirring for 2h to obtain a mixed solution; add 1mmol of ammonium metavanadate to the mixed solution, and stir for 0.5 h, use ammonia water to adjust the pH of the system to 2, continue to stir for 0.5h, transfer to a hydrothermal reaction kettle for 24h at 180°C, centrifuge, wash, and vacuum dry at 60°C to obtain figure 2 The cauliflower-like bismuth vanadate visible photocatalyst 2 is shown. The cauliflower is a hierarchical structure composed of smaller particles.

Embodiment 3

[0015] Dissolve 0.342g of soluble starch in 50ml of nitric acid solution with a molar concentration of 1mol / L, stir evenly, add 0.5mmol of bismuth nitrate, and continue stirring for 2h to obtain a mixed solution; add 0.5mmol of ammonium metavanadate to the mixed solution, Stir for 0.5h, adjust the pH of the system to 4 with ammonia water, continue stirring for 0.5h, transfer to a hydrothermal reaction kettle for 24h at 180°C, centrifuge, wash, and vacuum dry at 60°C to obtain image 3 The pinwheel-shaped bismuth vanadate visible photocatalyst 3 is shown. The pinwheel is composed of four wing-shaped impellers, and the impellers are composed of feather-like nanosheets.

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Abstract

The invention discloses a biomimetic synthesis method of a bismuth vanadate visible-light photocatalyst having a hierarchical structure, and belongs to the technical field of photocatalysis. The biomimetic synthesis method comprises the steps: (1) dissolving soluble starch in a nitric acid solution with the molar concentration of 1 mol / L, stirring uniformly, then adding bismuth nitrate, and continuing to stir for 2 h to obtain a mixed solution; (2) adding ammonium metavanadate into the mixed solution obtained in the step (1), stirring for 0.5 h, adjusting the pH of the system to 1-10 with aqua ammonia, continuing to stir for 0. 5 h, transferring into a hydrothermal reaction kettle, carrying out a hydrothermal reaction for 24 h at a temperature of 180 DEG C, carrying out centrifugal separation, washing, carrying out vacuum drying at a temperature of 60 DEG C, and thus obtaining the bismuth vanadate visible-light photocatalyst having the hierarchical structure. The synthesis method is simple and easy to implement and friendly to the environment; and the synthesized bismuth vanadate visible-light photocatalyst is uniform in morphology, has the hierarchical structure, and has higher visible-light catalytic activity.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a biomimetic synthesis method of a bismuth vanadate visible light catalyst with a hierarchical structure. 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 the treatment of environmental pollution. 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...

Claims

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Application Information

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IPC IPC(8): C01G31/00B01J23/22
Inventor 邢新艳马玉雪杨林李静樊广燕丁慧芳席国喜
Owner HENAN NORMAL UNIV
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