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SiO2-TiO2 composite nanomaterial of core-shell structure and preparation method and application thereof

A technology of nano-film material and shell structure, applied in separation methods, chemical instruments and methods, general water supply saving, etc., can solve the problem of not being able to achieve super-hydrophilic photocatalytic properties at the same time, not solving photocatalytic efficiency, not solving super-hydrophilic properties Water performance and other issues, to achieve the effect of high-efficiency photocatalytic properties, easy operation, and simple equipment

Inactive Publication Date: 2015-10-28
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Although the anatase nanomaterials prepared by this method have a high photocatalytic effect, the anatase nanomaterials prepared by this method do not solve the shortcomings of superhydrophilic properties.
And Chinese patent 103787586 A discloses a self-cleaning hydrophilic composite material and its preparation method. The self-cleaning hydrophilic composite material is a spherical shell material of hollow microspheres, and by improving the film structure from the microstructure, it can simultaneously The effectiveness of superhydrophilic properties and making it superhydrophilic is also extended, however, this method to prepare self-cleaning hydrophilic composites does not solve the disadvantage of low photocatalytic efficiency
Neither of these two methods can achieve superhydrophilic properties and efficient photocatalytic properties at the same time, and are not suitable for large-scale industrial applications.
In summary, current technologies fail to simultaneously satisfy the advantages of superhydrophilic properties and efficient photocatalytic properties.

Method used

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  • SiO2-TiO2 composite nanomaterial of core-shell structure and preparation method and application thereof
  • SiO2-TiO2 composite nanomaterial of core-shell structure and preparation method and application thereof
  • SiO2-TiO2 composite nanomaterial of core-shell structure and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0026] (1) Add tetraethyl orthosilicate (high purity), absolute ethanol (analytical grade), deionized water, ammonia water and a mass ratio of 109.6:923.5:26.7:5.8 into the reaction vessel in sequence, and keep the temperature at 30°C After reacting for 2 h, it was taken out, placed in a closed glass container, and aged in a constant temperature water bath at 25 °C for 7 d for later use. The ammonia in the sol was removed by reflux, and finally the sol was filtered through a 0.22 μm metafluoride membrane for later use. Alkali SiO 2 Sol, SiO 2 The content is 3% (by weight).

[0027] (2) Weigh 180 g of absolute ethanol and 20 g of concentrated hydrochloric acid, mix and dilute to prepare the catalyst. Weigh 150 g of base-catalyzed SiO 2 Add 3.20 g of butyl titanate to the sol and 0.96 g of the catalyst, add it while stirring in a constant temperature heating magnetic stirrer at 30 °C, after the dropwise addition is completed, react at constant temperature for 2 h, take it ou...

Embodiment 2

[0031] (1) Add tetraethyl orthosilicate (high purity), absolute ethanol (analytical grade), deionized water, ammonia water and a mass ratio of 109.6:923.5:26.7:5.8 into the reaction vessel in sequence, and keep the temperature at 30°C After reacting for 2 h, it was taken out, placed in a closed glass container, and aged in a constant temperature water bath at 25 °C for 7 d for later use. The ammonia in the sol was removed by reflux, and finally the sol was filtered through a 0.22 μm metafluoride membrane for later use. Alkali SiO 2 Sol, SiO 2 The content is 3% (by weight).

[0032] (2) Weigh 180 g of absolute ethanol and 20 g of concentrated hydrochloric acid, mix and dilute to prepare the catalyst. Weigh 150 g of base-catalyzed SiO 2 Add 5.48 g of butyl titanate to the sol and 1.64 g of the catalyst, add it while stirring in a constant temperature heating magnetic stirrer at 30 °C, after the dropwise addition, keep the constant temperature reaction for 2 hours, take it ou...

Embodiment 3

[0036] (1) Add tetraethyl orthosilicate (high purity), absolute ethanol (analytical grade), deionized water, ammonia water and a mass ratio of 109.6:923.5:26.7:5.8 into the reaction vessel in sequence, and keep the temperature at 30°C After reacting for 2 h, it was taken out, placed in a closed glass container, and aged in a constant temperature water bath at 25 °C for 7 days for later use. The ammonia in the sol was removed by reflux, and finally the sol was filtered through a 0.22 μm metafluoride membrane for later use. Alkali SiO 2 Sol, SiO 2 The content is 3% (by weight).

[0037] (2) Weigh 180 g of absolute ethanol and 20 g of concentrated hydrochloric acid, mix and dilute to prepare the catalyst. Weigh 150 g of base-catalyzed SiO 2 Add 7.19 g of butyl titanate to the sol and 2.16 g of the catalyst, add it while stirring in a constant temperature heating magnetic stirrer at 30 °C, after the dropwise addition is completed, react at constant temperature for 2 h, take it...

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Abstract

The invention discloses a SiO2-TiO2 composite nanomaterial of a core-shell structure and a preparation method and application thereof. The prepared SiO2-TiO2 composite nanomaterial of the core-shell structure has a super-hydrophilic property and an efficient photocatalysis property, the treatment process is short, the period is short, production efficiency can be greatly improved, and industrialization is easy to realize. Meanwhile, the application fields of self-cleaning materials can further be widened continuously, and the fields include air purification, sewage treatment, photocatalysis reactors, solar cell modules and the like.

Description

technical field [0001] The invention belongs to the field of self-cleaning nanomaterials, in particular to a core-shell structure SiO 2 -TiO 2 Composite nanomaterials and their preparation methods and applications. Background technique [0002] With the rapid development of my country's economy, environmental pollution has become one of the outstanding problems that need to be solved urgently. Due to the outstanding advantages of high degradation efficiency, mild reaction conditions, low energy consumption and less secondary pollution, nanomaterial photocatalytic technology has become one of the more promising environmental pollution control technologies. The sol-gel method has the advantages of low preparation temperature, simple process, and can prepare multi-component uniformly mixed films, and the film has uniform particle size and high purity. 2 The most common method for thin films. However, the sol-gel method usually requires high-temperature treatment to make TiO...

Claims

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Application Information

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IPC IPC(8): B01J21/08B01J35/10C02F1/30C02F1/74B01D53/86B01D53/72H01L31/048
CPCY02A20/212Y02E10/50Y02W10/37
Inventor 张欣向庄梦云苏文木林明月林丽晓赖凤麟
Owner FUJIAN AGRI & FORESTRY UNIV
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