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Visible light responsible photocatalytic material of Ag2ZO4 type composite oxide, its preparation and application

A technology of composite oxides and photocatalytic materials, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc. Problems such as local work, inability to absorb visible light, slow overall reaction rate, etc.

Inactive Publication Date: 2006-07-12
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently chemically stable titanium dioxide (TiO 2 ) is the main research object, and its wide industrial application is greatly restricted. The main problems include: 1. The quantum yield is low, the overall reaction rate is slow, and it is difficult to treat industrial waste gas and wastewater with large volume and high concentration; 2. The utilization rate of solar energy is low. Since the band gap of titanium dioxide is 3.2eV, it can only show activity under the irradiation of ultraviolet rays shorter than 400nm, so it can only absorb the ultraviolet part of sunlight and cannot absorb visible light, so it can only be used outdoors. Or work where there is a UV lamp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Preparation of Ag by Chemical Solution Precipitation 2 ZO 4 :

[0044] In the present invention, utilize the chemical solution precipitation method to synthesize Ag 2 ZO 4 (Z=Cr, Mo, W, Mn), the raw materials used are as follows (all sold by Sinopharm Chemical Reagent Co., Ltd.): AgNO 3 (99.8%), K 2 CrO 4 (99.5%), Na 2 MoO 4 (99.5%), Na 2 WO 4 (99.5%) and K 2 MnO 4 (99.5%). AgNO 3 Prepared as O.1mol / L solution, K 2 CrO 4 、Na 2 MoO 4 、Na 2 WO 4 and K 2 MnO 4 Prepare a solution of 0.05mol / L, and mix AgNO 3 The solution was slowly added to K 2 CrO 4 、Na 2 MoO 4 、Na 2 WO 4 and K 2 MnO 4 solution, respectively, to obtain Ag 2 CrO 4 、Ag 2 MoO 4 、Ag 2 WO 4 and Ag 2 MnO 4 The precipitate was filtered and dried to obtain a sample. Auxiliary sonication can be added during the reaction to make the Ag 2 ZO 4 The degree of crystallization is better and the reaction efficiency is higher. The particle size of the powder prepared by the above pr...

Embodiment 2

[0046] to Ag 2 ZO 4 or Ag 2 ZO 4 Preparation of M / Ag by doping modified material as host material 2 ZO 4 , M x o y / Ag 2 ZO 4 , M / (Ag 2 ZO 4 doped modified material), M x o y / (Ag 2 ZO 4 Doped modified material) composite material:

[0047] Get the Ag prepared by 1g embodiment 1 2 ZO 4 Several parts of powder, take the prepared AgNO according to the loading capacity 3 (1g / 100ml), Bi(NO 3 ) 3 ·5H 2 O(1g / 100ml), Ni(NO 3 ) 2 ·6H 2 O(1g / 100ml), Zn(NO 3 ) 2 ·6H 2 O (1g / 100ml), H 2 PtCl 6 ·6H 2 O (1g / 100ml), RuCl 3 ·3H 2 O (1g / 100ml) and other salt solutions, the Ag 2 ZO 4 The powder is mixed with salt solution and ground for half an hour, and dried in an oven. To prepare M / Ag 2 ZO 4 For composite materials (M=metal), place the powder in a tube furnace at 300-1200°C (different sintering temperatures are used according to the decomposition temperature of the above-mentioned salts), sinter in an air atmosphere for 3-12 hours, and then sinter in a hydr...

Embodiment 3

[0050] Ag 2 ZO 4 Thin film doctor blade method (Doctor Blade Method) preparation and Ag 2 ZO 4 Surface coating layer preparation:

[0051] In the preparation of Ag 2 ZO 4 During thin film, get the Ag that a small amount of embodiment 1 prepares 2 ZO 4 (Z=Cr, Mo, W, Mn) Add 2-4 drops of polyvinyl alcohol and acetylacetone to the powder, mix to form a slurry, and directly coat the slurry on the substrate with the Doctor Blade Method (20mm×20mm), sintering at 400°C for 2-5 hours can produce a film, weigh the substrate and the substrate with the film, and the weight of the film layer can be obtained, about 10mg-30mg.

[0052] When preparing the surface coating layer, take 100mg of Ag 2 ZO 4 (Z=Cr, Mo, W, Mn) powder, suspended in 100ml of water or organic solvent, the suspension is divided into 3-5 times and all sprayed on the surface of building materials (1m 2 ), an annealing treatment at 300-1000°C (different temperatures are used depending on the substrate material) f...

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Abstract

The invention relates to a visible light-response photo-catalyst material of Ag2ZO4 and relative preparation and application. Its formula presents as Ag2ZO4 as composite oxide semiconductor of photo-catalyst material (wherein, Z presents Cr, Mo, W, and Mn). The properties of said Ag2ZO4 can be modified by doping alkali metals, alkaline-earth metals, transient metal, Al, Ga, In, Ge, Sn, Pb, Sb or Bi to realize the improvement on the stability and light resistance while the doping mount is 0.1-10% (mass fraction). Said composite oxide semiconductor can be used to decompose the harmful chemical material via photo-catalyst, while it is characterized in that it can effectively decompose and remove the harmful chemical material in the radiation of ultraviolet light and visible light.

Description

1. Technical field [0001] The invention relates to a photocatalytic material (also known as photocatalyst). Especially photocatalytic materials that respond to visible light, this photocatalytic material is Ag composed of Ag and another metal (the common valence is +6) 2 ZO 4 Type compound metal oxide (also known as multi-element metal oxide) semiconductor material and its preparation and application. 2. Technical background [0002] In the 20th century, the rapid economic growth and the take-off of large-scale industrial production brought negative effects—the earth’s ecological environment is getting worse and worse, and there is a shortage of ore energy such as oil and coal. Needless to say, environmental hormones such as dioxane, pesticides and odorous substances in water and air also threaten people's safe and comfortable life. In the 21st century, the governments of various countries have been fully aware of environmental and energy issues, and have raised environme...

Claims

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Application Information

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IPC IPC(8): B01J23/68B01J23/54B01J37/03B01J37/12B01J37/16C02F1/30C09D7/12
CPCY02W10/37
Inventor 欧阳述昕张海涛邹志刚
Owner NANJING UNIV
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