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Visible-light responsive photocatalyst LiFe3Si2O9 and preparation method thereof

A photocatalyst, visible light technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of limited types of photocatalysts, low light conversion efficiency, difficult synthesis, etc. Wide response frequency range, simple preparation method and high light conversion efficiency

Inactive Publication Date: 2016-11-30
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, niobate photocatalyst Pb 3 Nb 4 o 13 、BiNbO 4 and Bi 2 MbO 7 (M=Al, Ga, In, Y, rare earth elements and Fe) etc. and niobium potassium composite oxide photocatalysts such as KNbO 3 , KNb 3 o 8 、K 4 Nb 6 o 17 and K 6 Nb 10.6 o 30 have good photocatalytic performance, but their intrinsic photocatalytic effect is weak or inactive in the visible light range.
[0005] Although photocatalysis research has been carried out for several years, most of the exploration and development of visible light-responsive photocatalysts are based on experience summaries obtained through a large number of experiments. Predict its photocatalytic performance in nature, so the types of photocatalysts with visible light response reported are still very limited, and there are problems such as low photoconversion efficiency, difficult synthesis, poor stability and narrow spectral response range, research and development of new preparations High-efficiency photocatalysts with simple methods and broad-band visible light response are difficult problems that scientists in the field have been eager to solve but have always been difficult to achieve, which largely limits the wide application and development of photocatalysts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) The analytically pure chemical raw material Li 2 CO 3 , Fe 2 o 3 and SiO 2 powder by LiFe 3 Si 2 o 9 The composition weighs the 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, take out and dry, and pass through a 200-mesh sieve.

[0020] (3) Pre-fire the uniformly mixed powder in step (2) at 1050°C, keep it warm for 6 hours, cool it down to room temperature naturally, and then pulverize it through a ball mill to make the average particle diameter smaller than 2 μm, and then LiFe is obtained. 3 Si 2 o 9 powder.

[0021] The prepared photocatalyst has a methyl orange removal rate of 97.2% in 60 minutes under the irradiation of visible light with a wavelength greater than 420nm.

Embodiment 2

[0023] (1) The analytically pure chemical raw material Li 2 CO 3 , Fe 2 o 3 and SiO 2 powder by LiFe 3 Si 2 o 9 The composition weighs the 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, take out and dry, and pass through a 200-mesh sieve.

[0025] (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 pulverize it with a ball mill to make the average diameter of the particles smaller than 2 μm, that is, LiFe 3 Si 2 o 9 powder.

[0026] The prepared photocatalyst has a methyl orange removal rate of 98.7% in 60 minutes under the irradiation of visible light with a wavelength greater than 420nm.

Embodiment 3

[0028] (1) The analytically pure chemical raw material Li 2 CO 3 , Fe 2 o 3 and SiO 2 powder by LiFe 3 Si 2 o 9 The composition weighs the 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, take out and dry, 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 average particle diameter smaller than 2 μm, that is, LiFe3 Si 2 o 9 powder.

[0031] The prepared photocatalyst can remove 98.1% of methyl orange in 60 minutes under the irradiation of visible light with a wavelength greater than 420nm.

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PUM

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Abstract

The invention discloses a wide-frequency and high-efficiency visible-light responsive photocatalyst LiFe3Si2O9 and a preparation method thereof. The chemical composition of the photocatalyst is LiFe3Si2O9. The invention also discloses a preparation method of the material. The photocatalyst has the advantages of wide spectrum response range, high light conversion efficiency and good stability, and has the functions of decomposing harmful chemical substances, organic biomass and sterilization under visible light irradiation; in addition, the preparation method is simple, low in the synthesis temperature and cost, and suitable for industrial production and applications.

Description

technical field [0001] The invention relates to a photocatalyst LiFe responsive to visible light 3 Si 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 social 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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IPC IPC(8): B01J23/78A62D3/30A62D101/26A62D101/28
CPCA62D3/30B01J23/002B01J23/78A62D2101/26A62D2101/28B01J2523/00B01J35/39B01J2523/11B01J2523/41B01J2523/842
Inventor 徐敏育段炼邓酩
Owner GUILIN UNIVERSITY OF TECHNOLOGY