Composite oxide photocatalyst Li2ZnM3O8 and its preparation method

A composite oxide and photocatalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of limited types of visible light-responsive photocatalysts, etc. Achieve the effects of excellent catalytic performance, low cost and simple preparation method

Inactive Publication Date: 2011-11-02
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the types of photocatalysts with visible light response reported are still very limi...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) 99.9% analytically pure chemical raw material Li 2 CO 3 , ZnO and SnO 2 , press Li 2 ZnSn 3 o 8 Chemical formula weighing ingredients;

[0021] 2) Put the raw materials prepared in step (1) into a ball mill tank, add zirconia balls and absolute ethanol, ball mill for 8-10 hours, mix and grind, take out and dry, and pass through a 200-mesh sieve;

[0022] 3) Pre-fire the uniformly mixed powder in step (2) at 920°C, keep it warm for 8 hours, cool it down to room temperature naturally, and then reduce the particle diameter to less than 2 μm by ball milling to obtain the composite oxide photocatalyst Li 2 ZnSn 3 o 8 powder.

[0023] The prepared photocatalyst can remove 96.5% of methyl orange in 120 minutes under the irradiation of visible light with a wavelength greater than 420nm.

Embodiment 2

[0025] 1) 99.9% analytically pure chemical raw material Li 2 CO 3 , ZnO and TiO 2 , press Li 2 ZnTi 3 o 8 Chemical formula weighing ingredients;

[0026] 2) Put the raw materials prepared in step (1) into a ball mill tank, add zirconia balls and absolute ethanol, ball mill for 10 hours, mix and grind, take out and dry, and pass through a 200-mesh sieve;

[0027] 3) Pre-fire the uniformly mixed powder in step (2) at 850°C, keep it warm for 4 hours, cool it down to room temperature naturally, and then pulverize it through a ball mill to reduce the particle diameter to less than 2 μm to obtain the composite oxide Li 2 ZnTi 3 o 8 Photocatalyst powder.

[0028] The prepared photocatalyst can remove 97.9% of methyl orange in 120 minutes under the irradiation of visible light with a wavelength greater than 420nm.

Embodiment 3

[0030] 1) 99.9% analytically pure chemical raw material Li 2 CO 3 , ZnO and ZrO 2 , press Li 2 ZnZr 3 o 8 Chemical formula chemical formula weighing ingredients;

[0031] 2) Put the raw materials prepared in step (1) into a ball mill tank, add zirconia balls and absolute ethanol, ball mill for 6 hours, mix and grind, take out and dry, and pass through a 200-mesh sieve;

[0032] 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 reduce the particle diameter to less than 2 μm to obtain the composite oxide Li 2 ZnZr 3 o 8 Photocatalyst powder.

[0033] 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 composite oxide photocatalyst Li2ZnM3O8 and its preparation method. The chemical general formula of the composite oxide photocatalyst is Li2ZnM3O8, wherein M is one element from the group consisting of Sn, Zr and Ti. The preparation method comprises the following steps of: weighing and proportioning 99.9% analytically pure chemical raw materials Li2CO3, ZnO and MO2 according to the chemical formula of Li2ZnM3O8, wherein M is one element from the group consisting of Sn, Zr and Ti; placing the proportioned raw materials into a ball-milling tank, adding zirconia balls and anhydrous ethanol, carrying out ball milling for 8-10 hours, mixing, grinding, taking out to dry, and sieving through a 200-mesh sieve; pre-burning the above uniformly mixed powders at the temperature of 850-950 DEG C, keeping warm for 4-8 hours, naturally cooling to room temperature, making the diameter of the particles small by ball milling until the diameter reaches below 2 microns to obtainthe composite oxide photocatalyst Li2ZnM3O8 powder. The preparation method provided by the invention is simple and has low cost; and the photocatalyst prepared by the method has excellent catalytic performance.

Description

technical field [0001] The invention relates to a composite oxide photocatalyst Li which responds to visible light 2 ZnM 3 o 8 The invention and a preparation method thereof belong to the field of inorganic photocatalytic materials. Background technique [0002] Since the 20th century, the rapid economic growth has brought serious negative effects-global environmental problems. Environmental pollution is a matter of great concern to all countries in the world. It has led to the continuous decline in the quality of people's drinking water and industrial water sources, resulting in increasing air pollution, resulting in continuous destruction of the ecological environment, and posing a serious threat to human survival. In order to solve these problems, people control and control environmental pollution through various methods. A large number of studies have shown that almost all organic pollutants can be effectively photocatalytically degraded, decolorized, detoxified, and...

Claims

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Application Information

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IPC IPC(8): B01J23/14B01J23/06C02F1/30C02F1/58C02F1/50
Inventor 胡长征刘洁群方亮
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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