Method for preparing high efficiency metallic, non-metallic ion co-doped nano-TiO2 visible-light responsive photocatalyst

A catalyst and non-metallic technology, applied in the field of photocatalysis, to achieve the effect of simple preparation process, low equipment requirements, and enhanced inhibition

Inactive Publication Date: 2008-11-12
NANKAI UNIV
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  • Description
  • Claims
  • Application Information

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The invention has been proved by domestic and foreign patent science and te

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  • Method for preparing high efficiency metallic, non-metallic ion co-doped nano-TiO2 visible-light responsive photocatalyst
  • Method for preparing high efficiency metallic, non-metallic ion co-doped nano-TiO2 visible-light responsive photocatalyst
  • Method for preparing high efficiency metallic, non-metallic ion co-doped nano-TiO2 visible-light responsive photocatalyst

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preparation example Construction

[0022] ②Pure TiO 2 Catalyst preparation

[0023] Preparation steps and Ti 1-x A x O 2-y B y Similar, except that no metal salt is added, and high-purity water (18.2MΩcm -1 ) Or the corresponding alcohol instead of the solution of the compound containing the non-metallic element for dropwise addition.

[0024] 3. When preparing the above sol, the amount of various reactants added is:

[0025] The molar ratio of metal salt to titanate is 1:1000-1:2

[0026] The volume ratio of diluent to titanate is 1:10-20:1

[0027] The volume ratio of acid catalyst to titanate is 1:30-1:2

[0028] The molar ratio of the compound containing non-metal elements to the titanate is 1:30-10:1

[0029] The titanate is any one or a mixture of tetrabutyl titanate, isopropyl titanate, propyl titanate or ethyl titanate.

[0030] The diluent is any one or a mixture of anhydrous ethanol, anhydrous methanol, propanol or isopropanol.

[0031] The acid catalyst is any one or a mixture of hydrochloric acid, sulfu...

Embodiment 1

[0037] 1. Nitrogen and nickel ions co-doped visible light catalyst (Ti 1-x Ni x O 2-y N y ) Preparation

[0038] At room temperature, 628.4mg of NiCl 2 ·5H 2 O was dissolved in 40ml of absolute ethanol, stirred until completely dissolved, 15ml of tetrabutyl titanate was slowly dropped into the reaction system, stirred for 0.5h, and then 4.16ml of concentrated hydrochloric acid was added dropwise (to control the sol-gel The hydrolysis process of the system makes the polycondensation reaction complete), stirring, and after 12 hours of standing and aging, 3ml of ammonia water is slowly dropped during the stirring process, and a large amount of white precipitate appears. After stirring for 3 hours at room temperature, the system became a white gel. The gel was dried at 100°C, ground into powder, and sintered at 450°C for 2 hours to obtain a visible light catalyst co-doped with nitrogen and nickel ions ( Ti 1-x Ni x O 2-y N y )sample.

[0039] 2. TiO 2-y N y Catalyst preparation

[004...

Embodiment 2

[0044] 1. Visible light catalyst co-doped with boron and zinc ions (Ti 1-x Zn x O 2-y B y ) Preparation

[0045] Add 1.098g zinc acetate (molecular formula Zn(CH3COO) 2 ·2H 2 O) Dissolve in 25ml of absolute ethanol, stir to dissolve, slowly drop 15ml of tetrabutyl titanate into the reaction system, stir for 0.5h, and then add 4.16ml of concentrated hydrochloric acid dropwise (control the sol-gel system The process of hydrolysis, the polycondensation reaction is complete), stir, stand and age for 2 hours, slowly drop in the ethanol solution of boric acid (0.307g of boric acid dissolved in 25ml of absolute ethanol) during the stirring process, and continue to stir at room temperature When the system becomes a gel, the gel is dried at 100°C, ground into powder, and sintered at 450°C for 2 hours to obtain a visible light catalyst co-doped with boron and zinc ions (Ti 1-x Zn x O 2-y B y )sample.

[0046] 2. TiO 2-y B y Catalyst preparation

[0047] Preparation steps and Ti 1-x Zn x O 2...

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Abstract

The invention discloses a process for preparing a high efficiency nanometer Tio2 visible light catalyst codoped with metal and non metallic ion, belonging to the photocatalysis technology field. The invention adopts titanic acid ester as precursor, uses metal salt and non-metallic compound as dopant, in accordance with sol-gel method, prepares the nanometer TiO2-based photocatalyst with codoping, high efficiency and visible light catalytic activity, wherein the catalytic activity is greatly higher than that of single-doped TiO2-based catalyst. The invention is characterized by the following: 1. due to codoping of the metal and non metallic ion, discrete localized doping level is formed respectively on the lower part of the conduction band energy level and the upper part of the valence band energy level of the TiO2-based catalyst, thus increasing the absorption of visible light and greatly improving the catalytic activity; 2. the doping level can inhibit the recombination of photogenerated carrier, promote the probability of the photogenerated carrier entering into the photocatalytic reaction and efficiently degrade pollutant molecules.

Description

【Technical Field】 [0001] The invention belongs to the research field of photocatalysis technology, and is mainly used for environmental purification of water and air (removal of organic and inorganic pollutants in the environment). 2 Visible light catalyst method. 【Background technique】 [0002] TiO 2 It has the special functions of sterilization and degradation of environmental pollutants under ultraviolet light, and has the advantages of low price and good stability. It is a kind of environmental purification material with good performance. Using nano TiO 2 Based on the photocatalyst, the use of solar energy to achieve environmental purification, not only saves energy, but also can sterilize and degrade pollutants (organic and inorganic pollutants) in the atmosphere and water. It is an ideal science and technology for environmental management. The attention of the scientific community. [0003] However, currently TiO 2 Based on the catalyst, there are still key problems in the ...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J23/755B01J23/14B01J21/06B01J21/02B01J37/02C02F1/30A61L9/22
Inventor 曹亚安曹永强龙绘锦
Owner NANKAI UNIV
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