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Visible light-responsive photocatalyst li 2 the si 3 ta 8 o 27 and its preparation method

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 problem of limited photocatalyst types, narrow spectral response range, photocatalytic The effect is weak and other problems, and the effect of low cost, wide spectral response range and simple preparation method is achieved

Active Publication Date: 2016-08-24
SHANDONG XINGQIANG CHEM IND TECH RES INST CO LTD
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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, the types of photocatalysts with visible light response reported are still very limited, and there are still problems such as low photoconversion efficiency, poor stability and narrow spectral response range, so the research and development of new photocatalysts with Efficient photocatalysts responsive to visible light are highly desirable

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 O, SiO 2 and Ta 2 o 5 The raw powder of Li 2 Si 3 Ta 8 o 27 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 distilled water, ball mill for 8 hours, mix and grind until fine, take it out and dry it, pass through a 200-mesh sieve.

[0020] (3) Pre-fire the uniformly mixed powder in step (2) at 1100°C, keep it warm for 6 hours, cool it down to room temperature naturally, and then pulverize it through a ball mill to make the average particle diameter smaller than 2 μm, that is, Li 2 Si 3 Ta 8 o 27 powder.

[0021] The prepared photocatalyst can remove 97.6% of methyl orange in 60 minutes under the irradiation of visible light with a wavelength greater than 420nm.

Embodiment 2

[0023] (1) 99.9% analytically pure chemical raw material Li 2 O, SiO 2 and Ta 2 o 5 The raw powder of Li 2 Si 3 Ta 8 o 27 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 distilled water, ball mill for 8 hours, mix and grind until fine, take it out and dry it, pass through a 200-mesh sieve.

[0025] (3) Pre-fire the uniformly mixed powder in step (2) at 1120°C, keep it warm for 6 hours, cool it down to room temperature naturally, and then pulverize it through a ball mill to make the average particle diameter smaller than 2 μm, that is, Li 2 Si 3 Ta 8 o 27 powder.

[0026] The prepared photocatalyst can remove 98.9% 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 O, SiO 2 and Ta 2 o 5 The raw powder of Li 2 Si 3 Ta 8 o 27 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 distilled water, ball mill for 8 hours, mix and grind until fine, take it out and dry it, pass through a 200-mesh sieve.

[0030] (3) Pre-fire the uniformly mixed powder in step (2) at 1150°C, keep it warm for 6 hours, cool it down to room temperature naturally, and then pulverize it through a ball mill to make the average particle diameter smaller than 2 μm, that is, Li2 Si 3 Ta 8 o 27 powder.

[0031] The prepared photocatalyst can remove 98.2% 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 visible-light response light catalyst Li2Si3Ta8O27 and a preparation method thereof. The chemical composition formula of the light catalyst is Li2Si3Ta8O27. The invention also discloses a preparation method of the visible-light response light catalyst Li2Si3Ta8O27. The obtained light catalyst has the advantages of wide spectral response range, high light conversion rate, high stability and the like, and has the functions of decomposing harmful chemical substances and organic biomasses and killing bacteria under the irradiation of visible light; in addition, the preparation method is simple, the synthesis temperature is low, the cost is low, and the light catalyst is suitable for industrial production and application.

Description

technical field [0001] The invention relates to a photocatalyst Li with visible light response 2 Si 3 Ta 8 o 27 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 und...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/847
Inventor 罗昊苏和平李洁
Owner SHANDONG XINGQIANG CHEM IND TECH RES INST CO LTD