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Visible-light responsive photocatalyst SrTi5O11 and preparing 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 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: 2013-12-04
江苏品胜照明集团有限公司
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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
Titanate SrTiO 3 、BaTi 4 o 9 Research reports on the photocatalytic performance of SrTiO 3 、BaTi 4 o 9 Does not have photocatalytic performance in the visible light range
Our study on titanate BaTi 5 o 11 and SrTi 5 o 11 、CaTi 5 o 11 conducted research on photocatalytic performance in the visible light segment, and found that SrTi 5 o 11 photocatalytic performance with excellent visible light response, but BaTi 5 o 11 and CaTi 5 o 11 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 SrCO 3 and TiO 2 , press SrTi 5 o 11 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 1250°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, and then you can get titanate SrTi 5 o 11 powder.

[0021] 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 2

[0023] (1) 99.9% analytically pure chemical raw material SrCO 3 and TiO 2 , press SrTi 5 o 11 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 1270°C, keep it warm for 6 hours, cool it down to room temperature naturally, and then use ball mill pulverization to make the particle diameter smaller than 2 μm, and then obtain titanate SrTi 5 o 11 powder.

[0026] The prepared photocatalyst can remove 98.9% 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 SrCO 3 and TiO 2 , press SrTi 5 o 11 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 1280°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, and then obtain titanate SrTi 5 o 11 powder.

[0031] The prepared photocatalyst can remove 98.2% 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 SrTi5O11 and a preparing method thereof. The chemical composition formula of the titanate photocatalyst is SrTi5O11. The invention further discloses the preparing method of the photocatalyst SrTi5O11. The preparing method is simple and low in cost, the prepared photocatalyst has good catalytic performance, the effect that harmful chemicals are decomposed under visible light irradiation is achieved, stability is good, and great application prospect is achieved.

Description

technical field [0001] The invention relates to a photocatalyst SrTi responsive to visible light 5 o 11 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 oxida...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/02
Inventor 唐莹方亮韦珍海
Owner 江苏品胜照明集团有限公司