Visible-light-responded photocatalyst K2Ni2Sb8O23 and preparation method thereof

A photocatalyst and visible light technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of limited types of photocatalysts, low photoconversion efficiency, and difficult synthesis and other problems, to achieve the effects of wide frequency range of visible light response, high light conversion efficiency, and simple preparation method

Active Publication Date: 2015-06-24
CHINA THREE GORGES UNIV
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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 K 2 CO 3 , NiO and Sb 2 O 5 The original powder press K 2 Ni 2 Sb 8 O 23 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 950°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 K 2 Ni 2 Sb 8 O 23 powder.

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

Embodiment 2

[0023] (1) 99.9% analytically pure chemical raw material K 2 CO 3 , NiO and Sb 2 O 5 The original powder press K 2 Ni 2 Sb 8 O 23 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 980°C, keep it warm 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 K 2 Ni 2 Sb 8 O 23 powder.

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

Embodiment 3

[0028] (1) 99.9% analytically pure chemical raw material K 2 CO 3 , NiO and Sb 2 O 5 The original powder press K 2 Ni 2 Sb 8 O 23 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 1000°C, keep it 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 K 2 Ni 2 Sb 8 O 23 powder.

[0031] The prepared photocatalyst, under visible light with a wavelength greater than 420nm, the removal rate of methyl orange reached 98.2% in 60 minutes.

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Abstract

The invention discloses a broadband and efficient visible-light-responded photocatalyst K2Ni2Sb8O23 and a preparation method thereof. The chemical composition formula of the photocatalyst is K2Ni2Sb8O23. The invention further discloses the preparation method of the photocatalyst. The photocatalyst disclosed by the invention has the advantages of wide spectral response range, high light conversion efficiency, good stability and the like; the photocatalyst plays a role in decomposing harmful chemical substances and organic biomass and sterilizing under the irradiation of visible light; in addition, the preparation method is simple, is low in synthesis temperature and low in cost and is applicable to industrial production and application.

Description

Technical field [0001] The invention relates to a visible light-responsive photocatalyst K 2 Ni 2 Sb 8 O 23 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): B01J23/843
Inventor 方清方亮孙宜华李东升
Owner CHINA THREE GORGES UNIV
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