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Hollow TiO2 microsphere synthesizing method

A microsphere, hollow technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems such as the inability to significantly reduce the specific surface area, the difficulty of separating the medium liquid, etc., to improve the light absorption efficiency, improve the reuse rate, and reduce the cost. Effect

Active Publication Date: 2012-10-03
溧阳常大技术转移中心有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, in TiO 2 As a photocatalyst, nano-TiO 2 The powder exhibits relatively high catalytic activity due to its nano-size effect and high specific surface area, but nano-TiO 2 It is difficult to separate the powder from the medium liquid during use
Therefore, it is also necessary to increase the particle size without significantly reducing its specific surface area.

Method used

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  • Hollow TiO2 microsphere synthesizing method

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) Mix 5 mL of n-butyl titanate with 2 mL of acetylacetone, and stir for 0.5 h. The reaction is exothermic. The next step can only be performed when the temperature of the system returns to room temperature.

[0029] (2) Take 50 mL of an aqueous solution of 72 mg / L dodecylbenzenesulfonic acid and slowly add it to the above liquid while stirring to form a milky white dispersion system. Stirring was continued for 1 h.

[0030] (3) The above dispersion system was transferred to a reactor with a polytetrafluoroethylene inner cup, and reacted at a temperature of 150 °C for 24 h.

[0031] (4) After the reaction product was centrifuged, washed with water and ethanol, it was dried at 100°C for 2 h.

[0032] (5) Finally, the sample was heat-treated in a muffle furnace at 550 °C for 0.5 h to obtain TiO 2 microsphere catalyst. Its electron microscope pictures are as figure 1 . It can be seen that the appearance of the particles is spherical, and the surface is relatively ...

Embodiment 2

[0046] (1) Mix 5 mL of n-butyl titanate with 2 mL of acetylacetone, and stir for 0.5 h. The reaction is exothermic. The next step can only be performed when the temperature of the system returns to room temperature.

[0047] (2) Take 50 mL of an aqueous solution of 800 mg / L dodecylbenzenesulfonic acid and slowly add it to the above liquid while stirring to form a milky white dispersion system. Stirring was continued for 1 h.

[0048] (3) The above dispersion system was transferred to a reactor with a polytetrafluoroethylene inner cup, and reacted at a temperature of 150 °C for 24 h.

[0049] (4) After the reaction product was centrifuged, washed with water and ethanol, it was dried at 100°C for 2 h.

[0050] (5) Finally, the sample was heat-treated in a muffle furnace at 550 °C for 0.5 h to obtain TiO 2 microsphere catalyst. Its electron microscope pictures are as figure 2 . The shape of the particles is similar to the product obtained in Example 1, except for the sphe...

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Abstract

The invention discloses a hollow TiO2 microsphere synthesizing method, and belongs to the field of solar energy utilizing photovoltaic technology and photocatalysts. In the hollow TiO2 microsphere synthesizing method, through hydrothermal treatment, tetrabutyl titanate is directly taken as an oil phase and forms an emulsion dispersion system with water to obtain a TiO2 hollow spherical particle; a hollow characteristic is obtained through simple change in the mixing sequence of raw materials; the substantial part of the TiO2 hollow spherical particle has a three-dimensional interpenetrating network structure formed by a nano TiO2 crystal grain and a nano-sized space; the average diameter of the spherical particle is 0.5-1.5 microns and can be adjusted by changing the adding amount of a surfactant; the specific surface area of the spherical particle is 32-97 m2 / g; the apparent density of the spherical particle is 1.91 g / cm3. When the hollow spherical particle is used as an electrode material of a dye-sensitized TiO2 solar cell, the optical path can be elongated and the utilization efficiency of light energy can be improved; and when the hollow spherical particle is used as a photocatalyst, the photocatalytic activity is high and the hollow spherical particle is easily separated from a liquid medium.

Description

technical field [0001] The invention relates to a hollow TiO 2 The invention discloses a method for preparing microspheres, which belongs to the field of photovoltaic technology and photocatalyst utilizing solar energy. Background technique [0002] The main goal of solar cell research is to improve the light-to-electricity conversion efficiency. For dye-sensitized TiO 2 Solar cell, its photoelectric conversion efficiency and TiO 2 The microstructure of the electrode is closely related. When the TiO making up the electrode 2 When the size of the particle increases to the wavelength of visible light, the optical path is prolonged due to the enhancement of its scattering effect on visible light, which is conducive to improving the light capture efficiency of dye molecules. But TiO 2 The increase in particle size is beneficial to light scattering and also reduces the TiO 2 specific surface area. While the small nano-sized TiO 2 Particles have a large specific surface a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
Inventor 董如林王彩霞刘淑赟陈智栋金长春王文昌
Owner 溧阳常大技术转移中心有限公司
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