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Pore structured niobate photocatalyst K6MNb15O42 and preparation method thereof

A pore structure and photocatalyst technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of limited photocatalyst types, poor stability, and light conversion efficiency Low-level problems, to achieve the effect of excellent catalytic performance, low cost, and simple preparation method

Inactive Publication Date: 2013-07-10
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]Although photocatalytic research has been carried out for several years, the types of photocatalysts with visible light response reported are still very limited, and there are still low photoconversion efficiency and poor stability. Therefore, it is necessary to research and develop new high-efficiency photocatalysts with visible light response.

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 , Fe 2 o 3 and Nb 2 o 5 , press K 6 FeNb 15 o 42 Chemical formula weighing 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 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 particle diameter smaller than 2 μm, and then you can get niobic acid with a pore structure Salt K 6 FeNb 15 o 42 powder.

[0021] The prepared photocatalyst can remove 98.5% of methyl orange in 120 minutes under the irradiation of visible light with a wavelength greater than 420nm.

Embodiment 2

[0023] (1) 99.9% analytically pure chemical raw material K 2 CO 3 , Fe 2 o 3 and Nb 2 o 5 , press K 6 FeNb 15 o 42 Chemical formula weighing 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 1015°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 particle diameter smaller than 2 μm, and then you can get niobic acid with a pore structure Salt K 6 FeNb 15 o 42 powder.

[0026] The prepared photocatalyst can remove 98.7% of methyl orange in 120 minutes under the irradiation of visible light with a wavelength greater than 420nm.

Embodiment 3

[0028] (1) 99.9% analytically pure chemical raw material K 2 CO 3、Cr 2 o 3 and Nb 2 o 5 , press K 6 CrNb 15 o 42 Chemical formula weighing 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 1020°C, keep it warm for 6 hours, cool it down to room temperature naturally, and then use ball mill pulverization to make the particle diameter smaller than 2 μm, and then you can get niobic acid with a pore structure Salt K 6 CrNb 15 o 42 powder.

[0031] The prepared photocatalyst can remove 98.9% of methyl orange in 120 minutes under the irradiation of visible light with a wavelength greater than 420nm.

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Abstract

The invention discloses a visible-light responding pore structured niobate photocatalyst K6MNb15O42 and a preparation method thereof. The chemical composition general formula of the pore structured niobate photocatalyst is K6MNb15O42, wherein M is one of Fe and Cr. The invention also discloses the preparation method of the material. The preparation method is simple and is low in cost. The prepared photocatalyst has excellent catalytic performance, has the function of decomposing harmful chemical substances under visible light irradiation and has good stability and good application prospect.

Description

technical field [0001] The invention relates to a visible light-responsive pore structure niobate photocatalyst K 6 Nb 15 o 42 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] In 1972, Fujishima discovered TiO 2 Semiconductor electrodes have the effect of photolyzing water under ultraviolet light irradiation, which has triggered an upsurge of research on semiconductor photocatalysis. Its main fields include: (1) Using sunlight as energy and oxygen in the air as oxidant to promote the complete decomposition of organic pollutants in water and air into CO 2 、H 2 O and other inorga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847B01J23/26C01G49/02C01G37/02C01G33/00
Inventor 方亮唐莹韦珍海
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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