Visible light responding photocatalyst LiFe3Sn2O9 and preparation method thereof

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

Inactive Publication Date: 2017-01-04
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) Analyze pure chemical raw material Li 2 CO 3 , Fe 2 O 3 And SnO 2 The powder is LiFe 3 Sn 2 O 9 The composition of the 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 1100°C, keep it for 6 hours, cool it naturally to room temperature, and then pulverize it with a ball mill to make the average particle diameter smaller than 2μm, to obtain LiFe 3 Sn 2 O 9 powder.

[0021] The prepared photocatalyst, under visible light with a wavelength greater than 420nm, the removal rate of methyl orange reached 96.8% in 60 minutes.

Embodiment 2

[0023] (1) Analyze pure chemical raw material Li 2 CO 3 , Fe 2 O 3 And SnO 2 The powder is LiFe 3 Sn 2 O 9 The composition of the weighing ingredients.

[0024] (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.

[0025] (3) Pre-fire the uniformly mixed powder in step (2) at 1130°C, keep it for 6 hours, cool it naturally to room temperature, and then pulverize it by a ball mill to reduce the average particle diameter to less than 2μm, which is LiFe 3 Sn 2 O 9 powder.

[0026] The prepared photocatalyst has a removal rate of 98.6% for methyl orange in 60 minutes under the irradiation of visible light with a wavelength greater than 420nm.

Embodiment 3

[0028] (1) Analyze pure chemical raw material Li 2 CO 3 , Fe 2 O 3 And SnO 2 The powder is LiFe 3 Sn 2 O 9 The composition of the weighing ingredients.

[0029] (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.

[0030] (3) Pre-fire the uniformly mixed powder in step (2) at 1150°C, keep it for 6 hours, cool it naturally to room temperature, and then pulverize it by a ball mill to reduce the average particle diameter to less than 2μm to obtain LiFe 3 Sn 2 O 9 powder.

[0031] The prepared photocatalyst has a removal rate of 97.5% for methyl orange under the irradiation of visible light with a wavelength greater than 420nm in 60 minutes.

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PUM

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Abstract

The invention discloses a visible light responding photocatalyst LiFe3Sn2O9 and a preparation method thereof. The chemical formula of the photocatalyst is LiFe3Sn2O9. The invention further discloses a preparation method of the material. The photocatalyst disclosed by the invention has the advantages of being wide in spectral response range, high in light conversion efficiency, good in stability and the like, and has functions of harmful chemical substance decomposition, organic biomass decomposition and sterilization under the radiation of visible light, and in addition, is simple in preparation method, low in synthesis temperature, low in cost and applicable to industrial production and application.

Description

Technical field [0001] The invention relates to a photocatalyst LiFe responsive to visible light 3 Sn 2 O 9 The preparation method thereof belongs to the field of inorganic photocatalytic materials. Background technique [0002] With the development of social economy, people are paying more and more attention to energy and ecological environment. Solving energy shortage and environmental pollution is an urgent need to achieve sustainable development, improve people's quality of life, and ensure national security. [0003] From the late 1970s, people proposed the use of photocatalysts to decompose organics such as pesticides and malodorous substances in the water and the atmosphere, and self-cleaning of solid surfaces coated with photocatalysts. The principle of the photocatalytic reaction is that the photocatalyst generates holes and electrons after absorbing photons higher than its band gap energy. These holes and electrons undergo oxidation and reduction reactions respectively to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/835
CPCB01J23/002B01J23/835B01J35/004B01J35/023B01J37/0036B01J2523/00B01J2523/11B01J2523/43B01J2523/842
Inventor 徐敏育段炼唐莹
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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