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A kind of preparation method of hollow titanium dioxide microsphere

A technology of titanium dioxide and silicon dioxide, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve problems such as difficult-to-control reactions, achieve simple preparation process, stable structure, and improve electron transmission efficiency.

Inactive Publication Date: 2016-01-13
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many ways to prepare hollow titanium dioxide microspheres, such as hydrothermal method, etc., but the traditional preparation method is usually carried out in a closed and high-pressure reactor, which is difficult to control the reaction, including the thickness of the shell, porosity and crystallinity

Method used

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  • A kind of preparation method of hollow titanium dioxide microsphere
  • A kind of preparation method of hollow titanium dioxide microsphere
  • A kind of preparation method of hollow titanium dioxide microsphere

Examples

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Embodiment 1

[0029] A preparation method of hollow titanium dioxide microspheres, comprising the following steps:

[0030] (1) Take tetraethyl silicate, deionized water, ethanol and ammonia water and mix and stir for 4 hours. The volume ratio of tetraethyl silicate: deionized water: ethanol: ammonia water (mass fraction is 28%) is 1:5:25 : 0.5.

[0031] (2) Centrifuge the mixed solution in step (1) to separate the silica microspheres, wash with ethanol, and disperse into the ethanol solution. The mass and volume ratio of the silica microspheres to ethanol is 1g / 10mL.

[0032] (3) Disperse the silica-ethanol mixture into the mixture of hydroxypropyl cellulose, ethanol and deionized water and stir for 30 minutes. The mass of the hydroxypropyl cellulose is the total mass of the silica-ethanol mixture. 3-5%; the mass of the deionized water is 10% of the total mass of the silica-ethanol mixed solution; the mass of the ethanol is 15-20 times the total mass of the silica-ethanol mixed solution. ...

Embodiment 2

[0039] Photocatalytic degradation of rhodamine B with the titanium dioxide hollow microspheres made: get 5 mg of titanium dioxide microspheres, put them into 25 ml of rhodamine B solution, the concentration of rhodamine B is 20 mg / L. The volume of the reactor is 50mL, and the mixed solution is stirred for 30 minutes to ensure that it reaches the adsorption equilibrium. Turn on the 300W mercury lamp, take 1ml solution every 5min to measure the concentration of rhodamine B, and analyze its degradation degree. The results showed that its degradation rate reached 98% within 30 minutes.

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Abstract

The invention discloses a method for preparing hollow titania microspheres, which comprises firstly preparing a silica particle prefabricated body, then introducing titania sol to cover the silica surface to form a silica-titania core-shell structure, and then passing The sodium hydroxide solution removes the silica core structure, and hydrochloric acid removes the impure structure of the microspheres, and finally obtains structurally stable titanium dioxide hollow microspheres after calcination. The hollow titanium dioxide microspheres provided by the invention not only have higher crystallinity and porosity, but also improve the electron transmission efficiency and the photocatalytic degradation effect on organic pollution, the preparation process is simple, the cost is low, and the synthesized microspheres have a stable structure.

Description

technical field [0001] The invention relates to a method for preparing hollow titanium dioxide microspheres, belonging to the technical field of water treatment. Background technique [0002] Titanium dioxide has been proven to be a good photocatalyst, which has found applications in the fields of separation, energy storage, solar energy utilization, and catalysis and photocatalysis. It is currently recognized that the catalytic activity of titanium dioxide is affected by factors such as its own crystallinity and specific surface area. Among them, titanium dioxide hollow microspheres have good crystallinity, porosity and large specific surface area (reaction area) and have great application prospects. There are many ways to prepare hollow titanium dioxide microspheres, such as hydrothermal method, etc., but the traditional preparation method is usually carried out in a closed and high-pressure reactor, which is difficult to control the reaction process, including shell thic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06C01G23/053B01J35/10
CPCB01J21/063C01G23/053C01P2002/72C01P2004/04
Inventor 李轶臧怡文李林泽张文龙王大伟
Owner HOHAI UNIV
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