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Visible light responsive photocatalyst AgYW2O8 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: 2016-01-13
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) 99.9% analytical pure chemical raw material Ag 2 O, Y 2 O 3 And WO 3 The original powder according to AgYW 2 O 8 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 800°C, keep it warm for 6 hours, cool it naturally to room temperature, and then pulverize it by a ball mill to make the average particle diameter smaller, less than 2μm, to obtain AgYW 2 O 8 powder.

[0021] The prepared photocatalyst, under visible light with a wavelength greater than 420nm, the removal rate of methyl orange reached 97.7% in 60 minutes.

Embodiment 2

[0023] (1) 99.9% analytical pure chemical raw material Ag 2 O, Y 2 O 3 And WO 3 The original powder according to AgYW 2 O 8 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 830°C, keep it for 6 hours, cool it naturally to room temperature, and then pulverize with a ball mill to make the average particle diameter smaller, less than 2μm, to obtain AgYW 2 O 8 powder.

[0026] The prepared photocatalyst, under visible light with a wavelength greater than 420nm, the removal rate of methyl orange reached 98.1% in 60 minutes.

Embodiment 3

[0028] (1) 99.9% analytical pure chemical raw material Ag 2 O, Y 2 O 3 And WO 3 The original powder according to AgYW 2 O 8 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-burn the uniformly mixed powder in step (2) at 850°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, less than 2μm, to obtain AgYW 2 O 8 powder.

[0031] The prepared photocatalyst, under visible light with a wavelength greater than 420nm, the removal rate of methyl orange reached 97.9% in 60 minutes.

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Abstract

The invention discloses a broadband and high efficiency visible light responsive photocatalyst AgYW2O8 and a preparation method thereof. The chemical composition of the photocatalyst is AgYW2O8. The invention also discloses a preparation method of the material. The photocatalyst prepared by the method provided by the invention has the advantages of wide spectral response range, high light conversion efficiency and good stability, etc, and has the effects of harmful chemical substance and organic biomass decomposition and sterilization under visible light irradiation. In addition, the preparation method has the characteristics of simplicity, low synthesis temperature and low cost, thus being suitable for industrial production and application.

Description

Technical field [0001] The invention relates to a photocatalyst AgYW responsive to visible light 2 O 8 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 water and air, 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 respectively undergo oxidation and reduction reactions to decompose harmful c...

Claims

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Application Information

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IPC IPC(8): B01J23/68
Inventor 覃杏柳罗昊苏聪学
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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