Visible light responsible photocatalysis material of AgTO2 type composite oxide and its application

A composite oxide, photocatalytic material technology, applied in metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical/physical process, etc., can solve the problem of low solar energy utilization and low quantum yield , can only work outdoors or in places with ultraviolet lamps, 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

[0041] Preparation of AgTO by Ion Exchange Method 2 :

[0042] In the present invention, the ion exchange method is used to synthesize AgTO 2 (T=Al, Ga, In, Cr, Fe, Co, Ni), use raw material as follows (all are produced by Sinopharm Chemical Reagent Co., Ltd.): Li 2 CO 3 (99.99%), Al 2 o 3 (99.99%), Ga 2 o 3 (99.9%), In 2 o 3 (99.9%), Cr 2 o 3 (99.0%), Fe2 o 3 (99.0%), Co 2 o 3 (99.0%), NiO (99.0%), AgNO 3 (99.8%) and KNO 3 (99.0%). Preparing LiTO according to the stoichiometric ratio 2 (T=Al, Ga, In, Cr, Fe, Co, Ni): LiAlO 2 、LiCoO 2 Use Li 2 CO 3 with Al 2 o 3 or Co 2 o 3 Sintered at 900°C for 12 hours; LiGaO 2 , LiInO 2 , LiCrO 2 , LiFeO 2 Use Li 2 CO 3 with Ga 2 o 3 、In 2 o 3 、Cr 2 o 3 , Fe 2 o 3 Sintered at 750°C for 12 hours; LiNiO 2 Use Li 2 CO 3 Sintered with NiO at 650°C for 12 hours. The obtained precursor samples were mixed with AgNO 3 、KNO 3 Mix according to the molar ratio of 1:3:1, and then sinter at 275°C-400°C for 12 ...

Embodiment 2

[0044] AgTO 2 or AgTO 2 Preparation of M / AgTO by doping modified material as host material 2 , M x o y / AgTO 2 , M / (AgTO 2 doped modified material), M x o y / (AgTO 2 Doped modified material) composite material:

[0045] Get the AgTO prepared by 1g embodiment 1 2 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 AgTO 2 The powder is mixed with salt solution and ground for half an hour, and dried in an oven. To prepare M / AgTO 2 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 hydrogen atmosphere. Sintering under reduc...

Embodiment 3

[0048] AgTO 2 Thin film doctor blade method (Doctor Blade Method) preparation and AgTO 2 Surface coating layer preparation:

[0049] In the preparation of AgTO 2 For thin films, take a small amount of AgTO prepared in Example 1 2 (T=Al, Ga, In, Cr, Fe, Co, Ni) Add 2-4 drops each of polyvinyl alcohol and acetylacetone to the powder, mix to form a slurry, and directly use the doctor blade method (Doctor Blade Method) to mix the slurry Coat the substrate (20mm×20mm) and sinter at 400°C for 2-5 hours to produce a film. Weigh the substrate and the substrate with the film to obtain the weight of the film layer, which is about 10mg-30mg.

[0050] When preparing the surface coating layer, take 100mg of AgTO 2 (T=Al, Ga, In, Cr, Fe, Co, Ni) 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 th...

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PUM

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Abstract

The invention relates to a visible light-response photo-catalyst material of AgTO2 composite oxide, whose formula is presented by the AgTO2 as composite oxide semiconductor (wherein, T presents Al, Ga, In, Cr, Fe, Co, Ni). And its properties can be modified by doping oxide, hydrate, organic salt and inorganic salt of the metals as alkali metals, alkaline-earth metals, transient metal, Ge, Sn, Pb, Sb or Bi as raw material, while the doping mount is 0.1-20% (mass fraction). Said composite oxide semiconductor can decompose 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 AgTO composed of Ag and another metal (common valence is +3) 2 Type composite oxide (also known as multiple metal oxide) semiconductor materials and their applications. 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 environmental purification, new energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50B01J23/54B01J23/68B01J23/74B01J37/12B01J37/16C02F1/30C09D7/12
CPCY02W10/37
Inventor 欧阳述昕邹志刚
Owner NANJING UNIV
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