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Photocatalyst Li2WV2O9 with visible light response and preparation method thereof

A photocatalyst and visible light technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of limited photocatalyst types, poor stability, and low photoconversion efficiency and other problems, to achieve excellent catalytic performance, low cost, and simple preparation methods

Active Publication Date: 2014-01-22
扬州华亨电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]Although photocatalytic research has been carried out for several years, the types of photocatalysts with visible light response reported are still very limited, and there are still low photoconversion efficiency and poor stability. Therefore, it is necessary to research and develop new high-efficiency photocatalysts with visible light response.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) 99.9% analytically pure chemical raw material Li 2 CO 3 、WO 3 and V 2 o 5 , press Li 2 W V 2 o 9 Chemical formula weighing ingredients.

[0019] (2) Mix the raw materials prepared in step (1), put them into a ball mill jar, add zirconia balls and absolute ethanol, ball mill for 8 hours, mix and grind until fine, take it out and dry it, and pass through a 200-mesh sieve.

[0020] (3) Pre-fire the uniformly mixed powder in step (2) at 780°C, keep it warm for 6 hours, cool it down to room temperature naturally, and then use a ball mill to make the particle diameter smaller than 2 μm, that is, Li 2 W V 2 o 9 powder.

[0021] The prepared photocatalyst can remove 97.9% of methyl orange in 120 minutes under the irradiation of visible light with a wavelength greater than 420nm.

Embodiment 2

[0023] (1) 99.9% analytically pure chemical raw material Li 2 CO 3 、WO 3 and V 2 o 5 , press Li 2 W V 2 o 9 Chemical formula weighing ingredients.

[0024] (2) Mix the raw materials prepared in step (1), put them into a ball mill jar, add zirconia balls and absolute ethanol, ball mill for 8 hours, mix and grind until fine, take it out and dry it, and pass through a 200-mesh sieve.

[0025] (3) Pre-fire the uniformly mixed powder in step (2) at 790°C, keep it warm for 6 hours, cool it down to room temperature naturally, and then use a ball mill to reduce the particle diameter to less than 2 μm to obtain Li 2 W V 2 o 9 powder.

[0026] The prepared photocatalyst can remove 98.8% of methyl orange in 120 minutes under the irradiation of visible light with a wavelength greater than 420nm.

Embodiment 3

[0028] (1) 99.9% analytically pure chemical raw material Li 2 CO 3 、WO 3 and V 2 o 5 , press Li 2 W V 2 o 9 Chemical formula weighing ingredients.

[0029] (2) Mix the raw materials prepared in step (1), put them into a ball mill jar, add zirconia balls and absolute ethanol, ball mill for 8 hours, mix and grind until fine, take it out and dry it, and pass through a 200-mesh sieve.

[0030] (3) Pre-fire the uniformly mixed powder in step (2) at 800°C, keep it warm for 6 hours, cool it down to room temperature naturally, and then use a ball mill to make the particle diameter smaller than 2 μm, that is, Li 2 W V 2 o 9 powder.

[0031] The prepared photocatalyst can remove 98.4% of methyl orange in 120 minutes under the irradiation of visible light with wavelength greater than 420nm.

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Abstract

The invention discloses a vanadate photocatalyst Li2WV2O9 with visible light response and a preparation method thereof. The chemical composition formula of the vanadate photocatalyst is Li2WV2O9. The invention also discloses the preparation method of the material. The preparation method is simple and is low in cost. The prepared photocatalyst has excellent catalytic performance, has the function of decomposing harmful chemical substances when irradiated by visible light and has good stability and good application prospect.

Description

technical field [0001] The invention relates to a photocatalyst Li with visible light response 2 W V 2 o 9 The invention and a preparation method thereof belong to the field of inorganic photocatalytic materials. Background technique [0002] With the development of society and economy, people pay more and more attention to energy and ecological environment. Solving the problems of energy shortage and environmental pollution is an urgent need to achieve sustainable development, improve people's quality of life and ensure national security. [0003] Since the late 1970s, people have proposed the use of photocatalysts to decompose organic substances such as pesticides and odorous substances in water and the atmosphere, and self-cleaning of solid surfaces coated with photocatalysts. The principle of photocatalytic reaction is that after the photocatalyst absorbs photons higher than its bandgap energy, holes and electrons are generated, and these holes and electrons undergo o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30C01G41/00
Inventor 方亮韦珍海唐莹
Owner 扬州华亨电气有限公司
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