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Photocatalyst LiSm2NbO6 with visible light response and preparation method thereof

A photocatalyst and visible light technology, applied in the field of inorganic photocatalytic materials, can solve the problems of limited types of photocatalysts, low light conversion efficiency, difficult synthesis, etc., and achieve a wide range of visible light response frequency, high light conversion efficiency and simple preparation method. Effect

Inactive Publication Date: 2015-06-03
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. Therefore, the types of photocatalysts reported to respond to visible light are still 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) 99.9% analytically pure chemical raw material Li 2 CO 3 、Sm 2 o 3 and Nb 2 o 5 The raw powder of LiSm 2 NbO 6 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 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 950°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, LiSm 2 NbO 6 powder.

[0021] The prepared photocatalyst, under the irradiation of visible light with a wavelength greater than 420nm, can remove 97.5% of methyl orange in 60 minutes.

Embodiment 2

[0023] (1) 99.9% analytically pure chemical raw material Li 2 CO 3 、Sm 2 o 3 and Nb 2 o 5 The raw powder of LiSm 2 NbO 6 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 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 980°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, LiSm 2 NbO 6 powder.

[0026] The prepared photocatalyst can remove 98.4% of methyl orange in 60 minutes under the irradiation of visible light with a wavelength greater than 420nm.

Embodiment 3

[0028] (1) 99.9% analytically pure chemical raw material Li 2 CO 3 、Sm 2 o 3 and Nb 2 o 5 The raw powder of LiSm 2 NbO 6 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 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 1000°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, LiSm 2 NbO6 powder.

[0031] The prepared photocatalyst can remove 98.0% of methyl orange in 60 minutes under the irradiation of visible light with wavelength greater than 420nm.

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Abstract

The invention discloses a wideband and efficient photocatalyst LiSm2NbO6 with visible light response and a preparation method thereof. The chemical formula of the photocatalyst is LiSm2NbO6. The invention also discloses a preparation method of the material. The photocatalyst obtained by the preparation method has the advantages of wide spectral response range, high light conversion efficiency, good stability, and the like. Irradiated by visible light, the photocatalyst has the functions of decomposing harmful chemical substances and organic biomass and killing bacteria. Besides, the preparation method is simple, is low in synthesis temperature and cost and is suitable for industrial production and application.

Description

technical field [0001] The invention relates to a photocatalyst LiSm responsive to visible light 2 NbO 6 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 oxid...

Claims

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Application Information

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IPC IPC(8): B01J23/20
Inventor 方维双苏和平李洁
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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