Visible-light-responsive photocatalyst Sr5Ce2Ti8O25 and preparation method thereof

A photocatalyst and visible light technology, used in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Catalytic performance and other problems, to achieve the effect of low cost, simple preparation method and excellent catalytic performance

Active Publication Date: 2013-12-18
东台城东科技创业园管理有限公司
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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.
There are literature [G. Subodh, J. James, M. T. Sebastian, R. M. Paniago, A. Dias, and R. L. Moreira. Structure and microwave dielectric properties of Sr 2+n Ce 2 Ti 5+n o 15+3n (n≤10) homologous series. Chem. Mater. 19(2007)4077–4082.] reported titanate Sr 5 Ce 2 Ti 8 o 25 The preparation and microwave dielectric properties of ceramics, but there is no research report on the photocatalytic properties of this type of compound

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、 CeO 2 and TiO 2 , press Sr 5 Ce 2 Ti 8 o 25 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 1230°C, keep it warm for 6 hours, cool it down to room temperature naturally, and then use a ball mill to pulverize the particle diameter to be smaller than 2 μm to obtain titanate Sr 5 Ce 2 Ti 8 o 25 powder.

[0021] The prepared photocatalyst can remove 98.0% 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、 CeO 2 and TiO 2 , press Sr 5 Ce 2 Ti 8 o 25 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 1250°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, to obtain Sr 5 Ce 2 Ti 8 o 25 powder.

[0026] The prepared photocatalyst can remove 98.5% 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、 CeO 2 and TiO 2 , press Sr 5 Ce 2 Ti 8 o 25 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 use a ball mill to make the particle diameter smaller than 2 μm, that is, to obtain Sr 5 Ce 2 Ti 8 o 25 powder.

[0031] The prepared photocatalyst can remove 97.7% 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 Sr5Ce2Ti8O25 and a preparation method thereof. The chemical composition of the photocatalyst is Sr5Ce2Ti8O25. 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 invention relates to a visible light responsive titanate photocatalyst Sr 5 Ce 2 Ti 8 o 25 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] In 1972, Fujishima discovered TiO 2 Semiconductor electrodes have the effect of photolyzing water under ultraviolet light irradiation, which has triggered an upsurge of research on semiconductor photocatalysis. Its main fields include: (1) Using sunlight as energy and oxygen in the air as oxidant to promote the complete decomposition of organic pollutants in water and air into CO 2 、H 2 O and other inorganic salt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10C01G23/00
Inventor 苏和平方亮韦珍海
Owner 东台城东科技创业园管理有限公司
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