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Visible light response photocatalyst BaLa4W7O28 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. problems such as low conversion efficiency, to achieve the effects of excellent catalytic performance, low cost and simple preparation method

Active Publication Date: 2014-01-08
平邑经济开发区投资发展有限公司
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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
We are to BaLa 4 W 7 o 28 、SrLa 4 W 7 o 28 and CaLa 4 W 7 o 28 and other composite oxides were studied on the photocatalytic performance, and it was found that BaLa 4 W 7 o 28 photocatalytic performance with excellent visible light response, but SrLa 4 W 7 o 28 and CaLa 4 W 7 o 28 Photocatalytic properties 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 , La 2 o 3 and WO 6 , by BaLa 4 W 7 o 28 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 1080°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, and then get BaLa 4 W 7 o 28 powder.

[0021] The prepared photocatalyst can remove 98.7% 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 , La 2 o 3 and WO 6 , by BaLa 4 W 7 o 28 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 1090°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 BaLa 4 W 7 o 28 powder.

[0026] The prepared photocatalyst, under the irradiation of visible light with a wavelength greater than 420nm, can remove 99.1% of methyl orange within 120 minutes.

Embodiment 3

[0028] (1) 99.9% analytically pure chemical raw material BaCO 3 , La 2 o 3 and WO 6 , by BaLa 4 W 7 o 28 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 1100°C, keep it warm for 6 hours, cool it down to room temperature naturally, and then pulverize it with a ball mill to make the particle diameter smaller than 2 μm to obtain BaLa 4 W 7 o 28 powder.

[0031] The prepared photocatalyst can remove 98.8% 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 visible light response photocatalyst BaLa4W7O28 and a preparation method thereof. The chemical formula of the photocatalyst is BaLa4W7O28. The invention also discloses a preparation method of the material. The preparation method disclosed by the invention is simple and low in cost; the prepared photocatalyst has excellent catalytic performance, an effect of decomposing harmful chemical substances under the irradiation of visible light, high stability and a good application prospect.

Description

technical field [0001] The invention relates to a photocatalyst BaLa responsive to visible light 4 W 7 o 28 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30
Inventor 苏聪学郭欢欢方亮
Owner 平邑经济开发区投资发展有限公司
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