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Titanate photocatalyst Sr(i)x(/i)Ca3-(i)x(/i)Ti2O7 and preparation method thereof

A photocatalyst and titanate technology, which is 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 photoconversion Low efficiency and other problems, to achieve the effect of excellent catalytic performance, low cost, simple preparation method

Inactive Publication Date: 2013-07-24
GUILIN UNIVERSITY OF TECHNOLOGY
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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 SrCO 3 and TiO 2 , press Sr 3 Ti 2 o 7 Chemical formula weighing ingredients.

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

[0020] (3) Pre-fire the uniformly mixed powder in step (2) at 1200°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 3 Ti 2 o 7 powder.

[0021] 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 2

[0023] (1) 99.9% analytically pure chemical raw material CaCO 3 and TiO 2 , by Ca 3 Ti 2 o 7 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 pulverize it with a ball mill to make the particle diameter smaller than 2 μm, to obtain titanate Ca 3 Ti 2 o 7 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 SrCO 3 , CaCO 3 and TiO 2, by SrCa 2 Ti 2 o 7 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 1240°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 SrCa 2 Ti 2 o 7 powder.

[0031] 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.

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Abstract

The invention discloses a titanate photocatalyst Sr(i)x( / i)Ca3-(i)x( / i)Ti2O7 with visible-light response and a preparation method thereof. The chemical composition formula of the titanate photocatalyst is SrxCa3-xTi2O7, in which x is greater than or equal to 0 but less than or equal to 3. The invention further discloses the preparation method of the material. The preparation method provided by the invention is simple and low in cost. The photocatalyst prepared is excellent in catalytic performance and good in stability, and has the effect of decomposing harmful chemical substances under visible light irradiation and good application prospect.

Description

technical field [0001] The invention relates to a visible light responsive titanate photocatalyst Sr x Ca 3?x Ti 2 o 7 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 sal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/02
Inventor 方亮唐莹韦珍海
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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