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Visible-light-responsive photocatalyst Ba3W2O9 and preparation method thereof

A photocatalyst, ba3w2o9 technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve photocatalytic performance without visible light response and low photoconversion efficiency , poor stability and other issues, to achieve excellent catalytic performance, simple preparation method, and low cost

Active Publication Date: 2013-12-11
安徽上阡科技信息咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although photocatalysis 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 problems such as low photoconversion efficiency, poor stability and narrow spectral response range, so the research and development of new photocatalysts with Efficient photocatalysts responsive to visible light are highly desirable
Existing literature [K.R. Poeppelmeier, A.J. Jacobson, J.M. Longo, The structure of Ba 3 W 2 o 9 ; an example of face-shared octahedra with tungsten (VI), Materials Research Bulletin, 1980, 15: 339-345] reported the composite oxide Ba 3 W 2 o 9 The synthesis and crystal structure of Ba 3 W 2 o 9 、Sr 3 W 2 o 9 and Ca 3 W 2 o 9 conducted photocatalytic performance studies and found that Ba 3 W 2 o 9 photocatalytic performance with excellent visible light response, but the Sr 3 W 2 o 9 , Ca 3 W 2 o 9 Photocatalytic performance without 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 BaCO 3 and WO 3 , press Ba 3 W 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 1100°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, Ba 3 W 2 o 9 powder.

[0021] The prepared photocatalyst can remove 97.2% 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 BaCO 3 and WO 3 , press Ba 3 W 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 1130°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, Ba 3 W 2 o 9 powder.

[0026] The prepared photocatalyst can remove 98.3% 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 BaCO 3 and WO 3 , press Ba 3 W 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 1150°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, Ba 3 W 2 o 9 powder.

[0031]The prepared photocatalyst can remove 98.1% of methyl orange in 120 minutes under the irradiation of visible light with a wavelength greater than 420nm.

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Abstract

The invention discloses a visible-light-responsive photocatalyst Ba3W2O9 and a preparation method thereof. The chemical composition formula of the photocatalyst is Ba3W2O9. The invention also discloses a preparation method of the material. The preparation method disclosed by the invention is simple and low in cost; and the prepared photocatalyst has the advantages of excellent catalytic property and high stability, has the function of decomposing harmful chemical substances under visible light irradiation, and thus, has favorable application prospects.

Description

technical field [0001] The present invention relates to a kind of photocatalyst Ba of visible light response 3 W 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 electro...

Claims

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Application Information

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IPC IPC(8): B01J23/30
Inventor 方亮韦珍海苏和平
Owner 安徽上阡科技信息咨询有限公司
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