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Method for preparing Ag sensitized zinc oxide photocatalyst with visible light activity

A technology of silver-sensitized zinc oxide and visible light, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as poor effect, achieve fast heating, Improve visible light response, high utilization effect

Inactive Publication Date: 2007-05-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Noble metal doping can extend the wavelength of the excitation light that zinc oxide responds to from the ultraviolet region to the visible region, but the noble metals that can play a role are mainly noble metal particles, and the organic complexation method and spray drying in this patent require higher temperatures Zinc oxide is obtained by heat treatment with air, and the silver mainly exists in the form of silver oxide at this time, so that it is less effective in improving the visible light response of zinc oxide

Method used

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  • Method for preparing Ag sensitized zinc oxide photocatalyst with visible light activity
  • Method for preparing Ag sensitized zinc oxide photocatalyst with visible light activity

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Effect test

Embodiment 1

[0022] Dissolve 1g of zinc acetate in a mixed solution of ethylene glycol and glycerol, wherein the mass ratio of ethylene glycol: glycerol: zinc acetate is 50: 25: 1, and the mixed solution obtained after stirring evenly is heated by microwave circulation. After 5 cycles, the obtained suspension was filtered, washed, dried, and then roasted at 300°C to obtain zinc oxide; 0.2g of zinc oxide and 0.001g of silver nitrate were added to ethylene glycol, wherein ethylene glycol: The mass ratio of silver nitrate: zinc oxide is 50:0.005:1, and the mixed solution obtained after stirring evenly is heated and reduced by microwave circulation, and after 5 cycles; the obtained suspension is filtered and separated, washed with water and absolute ethanol respectively and drying to prepare a silver-sensitized zinc oxide photocatalyst with visible light activity.

Embodiment 2

[0024] Dissolve 1g of zinc acetate in a mixed solution of ethylene glycol and glycerol, wherein the mass ratio of ethylene glycol: glycerol: zinc acetate is 100: 50: 1, and the mixed solution obtained after stirring evenly is heated by microwave circulation. After 10 cycles, the resulting suspension was filtered, washed, dried, and then roasted at 300°C to obtain zinc oxide; 0.2g of zinc oxide and 0.002g of silver nitrate were added to ethylene glycol, wherein ethylene glycol: The mass ratio of silver nitrate: zinc oxide is 100:0.01:1, and the mixed solution obtained after stirring evenly is heated and reduced by microwave circulation, and after 10 cycles; the obtained suspension is filtered and separated, washed with water and absolute ethanol respectively and drying to prepare a silver-sensitized zinc oxide photocatalyst with visible light activity.

Embodiment 3

[0026] Dissolve 1g of zinc acetate in a mixed solution of ethylene glycol and glycerol, wherein the mass ratio of ethylene glycol: glycerol: zinc acetate is 150: 80: 1, and the mixed solution obtained after stirring is heated by microwave circulation. After 15 cycles, the obtained suspension was filtered, washed, dried, and then roasted at 400°C to obtain zinc oxide; 0.2g of zinc oxide and 0.004g of silver nitrate were added to ethylene glycol, wherein ethylene glycol: The mass ratio of silver nitrate: zinc oxide is 150:0.02:1, and the mixed solution obtained after stirring evenly is heated and reduced by microwave circulation, and after 10 cycles; the obtained suspension is filtered and separated, washed with water and absolute ethanol respectively , and dry to prepare a silver-sensitized zinc oxide photocatalyst with visible light activity as shown in Figure 1a, Figure 1b and Figure 2. Among them, Fig. 1a shows that the prepared zinc oxide is 30-50nm particles, and Fig. 1b s...

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Abstract

The invention relates to a method for preparing the silver sensitive zinc oxide catalyst with visible light activity, wherein it comprises dissolving the zinc acetate into the mixture of ethandiol and glycerin; mixing and heating with microwave; filtering, washing, drying and baking, to obtain the zinc oxide; then adding zinc oxide and silver nitrate into ethandiol; mixing and heating with microwave, reducing, filtering and separating, washing with water and alcohol, drying to obtain the final product. The invention has high silver utilization as 95%, and low silver content in Ag / ZnO composite, while its degrade rate on helianthin in one hour can reach 99.5% and 90.1% in two hours on fenol.

Description

technical field [0001] The invention relates to catalyst preparation technology, in particular to a preparation method of a silver-sensitized zinc oxide photocatalyst with high visible light activity. Background technique [0002] Since Professor Fujishima and Honda discovered TiO in 1972 2 Since water can be decomposed under light, photocatalytic technology has received extensive attention in environmental governance and energy utilization due to its advantages of simple process, low cost, no secondary pollution, and safety, and has become a hot research topic at home and abroad. TiO 2 Zinc oxide and zinc oxide are the most commonly used photocatalysts. Their band gap energy is 3.2eV. Under ultraviolet light with a wavelength of less than 385nm, they have high photocatalytic activity and can mineralize almost all organic pollutants to generate carbon dioxide and water. One of the catalysts for green environmental protection. However, its higher band gap energy can only h...

Claims

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Application Information

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IPC IPC(8): B01J23/60
Inventor 王红娟彭峰余皓朱汉财
Owner SOUTH CHINA UNIV OF TECH
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