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Preparation method of porous titanium dioxide/silicon dioxide/carbon nanocomposite material

A technology of porous titanium dioxide and silicon dioxide, applied in the direction of catalyst activation/preparation, chemical instruments and methods, nanotechnology, etc. The effect of grain growth, short preparation time and simple process

Active Publication Date: 2020-09-15
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many reports like this, but most of them require prefabricated carbon materials or the introduction of additional carbon sources and surface modifiers, and the preparation process is complicated and costly, making it difficult to scale up the system production
For this reason, the Chinese patent (application number: 201611115449.8, publication number: CN106673118B) proposes a method for preparing anatase TiO without adding an external carbon source and using a combination of solvothermal and heat treatment. 2 / C composite material method, but solvothermal often requires high temperature and high pressure environment and reaction kettle and other equipment, which has certain restrictions on its large-scale application
Lettmann et al prepared TiO by acid-catalyzed sol-gel method 2 / C composite material, but the preparation time is longer (Visible Light Photodegradation of 4-Chlorophenol with a Coke-Containing Titanium Dioxide Photocatalyst.Appl.Catal B:Environ, 2001, 32(4):215-227)

Method used

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  • Preparation method of porous titanium dioxide/silicon dioxide/carbon nanocomposite material
  • Preparation method of porous titanium dioxide/silicon dioxide/carbon nanocomposite material
  • Preparation method of porous titanium dioxide/silicon dioxide/carbon nanocomposite material

Examples

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Effect test

Embodiment 1

[0043] Example 1: TiO 2 / SiO 2 / C composite material

[0044] First, mix 4ml of absolute ethanol, 1ml of acetonitrile, 1ml of ethyl orthosilicate and 4ml of tetrabutyl titanate to prepare solution A; then prepare solution B with 30ml of distilled water, 96ml of absolute ethanol, 40ml of acetonitrile and 2.4ml of ammonia water, and stirred for 30 minutes; under the condition of a water bath at 40°C, add 1ml of solution A to solution B every 1 hour dropwise, after adding solution A, stir for 4 hours; then centrifuge the product, and wash the centrifuged product with water and absolute ethanol for 2 times; followed by drying in a blast drying oven at 60°C for 10h; the white powder was obtained by grinding, and finally placed in a tube furnace with nitrogen as a protective atmosphere, and the temperature was raised to 300°C at a rate of 5°C / min. Heat treatment at 3°C / min to 650°C for 2 hours, cool to room temperature and grind to obtain gray TiO 2 / SiO 2 / C nanocomposite, its ...

Embodiment 2

[0045] Example 2: TiO 2 / SiO 2 / C composite material

[0046] First, mix 4ml of absolute ethanol, 1ml of acetonitrile, 1ml of ethyl orthosilicate and 4ml of tetrabutyl titanate to prepare solution A; then prepare solution B with 30ml of distilled water, 96ml of absolute ethanol, 50ml of acetonitrile and 2.4ml of ammonia water, And stir for 1h; under the condition of 40℃ water bath, add 1ml of solution A to solution B every 1h, add solution A, and stir for 4h; then centrifuge the product, wash the centrifuged product with water and absolute ethanol for 2 times; followed by drying in a blast drying oven at 60°C for 10h; the white powder was obtained by grinding, and finally placed in a tube furnace with nitrogen as a protective atmosphere, and the temperature was raised to 300°C at a rate of 5°C / min. Heat treatment at 3°C / min to 650°C for 2 hours, cool to room temperature and grind to obtain gray TiO 2 / SiO 2 / C nanocomposites.

Embodiment 3

[0047] Example 3: TiO 2 / SiO 2 / C composite material

[0048] First, mix 4ml of absolute ethanol, 1ml of acetonitrile, 1ml of ethyl orthosilicate and 4ml of tetrabutyl titanate to prepare solution A; then prepare solution B with 30ml of distilled water, 96ml of absolute ethanol, 60ml of acetonitrile and 2.4ml of ammonia water, And stirred for 1h, under the condition of 40℃ water bath, drop 1ml of solution A to solution B every 1h, add solution A, stir for 4h; then centrifuge the product, wash the centrifuged product with water and absolute ethanol for 2 times; followed by drying in a blast drying oven at 60°C for 10h; the white powder was obtained by grinding, and finally placed in a tube furnace with nitrogen as a protective atmosphere, and the temperature was raised to 300°C at a rate of 5°C / min. Heat treatment at 3°C / min to 650°C for 2 hours, cool to room temperature and grind to obtain gray TiO 2 / SiO 2 / C nanocomposites.

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Abstract

The invention discloses a preparation method of a porous titanium dioxide / silicon dioxide / carbon nanocomposite material. The preparation method comprises the following steps: mixing an alcohol solvent, acetonitrile, an organic silicon source and a titanium source to obtain a solution A; mixing distilled water, an alcohol solvent, acetonitrile and an alkali liquor, and stirring to obtain a solutionB; adding the solution A into the solution B at a certain rate, continuously stirring after the addition of the solution A is finished, washing, drying, grinding to obtain powder, and performing heattreatment on the powder to obtain the porous titanium dioxide / silicon dioxide / carbon nanocomposite material. Under the condition of no external carbon source, acetonitrile is used for inhibiting incomplete hydrolysate of the organic titanium source and the silicon source and serves as a carbon source, the acetonitrile can be hydrolyzed to generate a large amount of ammonia water under the condition that a small amount of ammonia water is added in the early stage, the use amount of the ammonia water is reduced, and the added SiO2 can effectively inhibit growth of TiO2 grains under the high-temperature condition. In addition, the preparation method is simple in process, green, non-toxic, short in preparation time, low in cost and easy to enlarge system production.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a preparation method of a porous titanium dioxide / silicon dioxide / carbon nanocomposite material. Background technique [0002] With the rapid development of social economy, the problem of water pollution has been plagued by human beings, especially organic pollutants such as dyes, pesticides, and antibiotics in water are mostly stable in structure and difficult to biodegrade, which is extremely unfavorable to human life and biological survival. For this problem, scientists have been working on developing effective methods and suitable catalytic materials for the removal of organic pollutants in water. Among them, TiO 2 Due to its chemical and thermal stability, high refractive index, nontoxicity, and low cost, it has been extensively studied in the field of photodegradation, dye-sensitized solar cells, self-cleaning coatings, and solar water splitting. ...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J37/08B01J37/03B01J35/02B82Y30/00B82Y40/00
CPCB01J21/18B01J21/08B01J21/063B01J37/08B01J37/036B82Y30/00B82Y40/00B01J35/40Y02E60/10
Inventor 孟庆男谢章雯汤玉斐赵康
Owner XIAN UNIV OF TECH