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Preparation method of hollow titanium dioxide microspheres

A titanium dioxide, silicon dioxide technology, 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, improve electron transmission efficiency, high crystallinity. Effect

Inactive Publication Date: 2015-02-04
HOHAI UNIV
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  • 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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  • Preparation method of hollow titanium dioxide microspheres
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  • Preparation method of hollow titanium dioxide microspheres

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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 mixture in step (1) to separate the silica microspheres, wash with ethanol, and disperse them 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 min. The mass of the hydroxypropyl cellulose is the total mass of the silica-ethanol mixture. 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 to 20 times the total mass of the silica ethanol mixed solution.

[0033]...

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, and 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 preparation method of hollow titanium dioxide microspheres. The preparation method comprises the following steps: firstly, preparing a silicon dioxide particle prefabricate; then, introducing a titanium dioxide sol to cover the surface of silicon dioxide to form a core-shell structure of silicon dioxide-titanium dioxide; then, removing silicon dioxide core structure by using a sodium hydroxide solution; removing impure structures of the microspheres by using hydrochloric acid; and calcining to finally obtain the hollow titanium dioxide microspheres in stable structures. The hollow titanium dioxide microspheres disclosed by the invention not only have high degree of crystallinity and porosity, but also the electron transport efficiency and the photocatalytic degradation effect on organic pollution are improved. The preparation method is simple in preparation process and low in cost, and the synthesized microspheres are stable in structure.

Description

Technical field [0001] The present invention involves a preparation method of hollow titanium dioxide micro -ball, which is a technical field in the field of water treatment. Background technique [0002] Titanium dioxide is proven to be a good photocatalyst, which has been applied in the fields of separation, energy reserves, solar utilization, and catalytic and photocatalytic fields.At present, the catalytic activity of titanium dioxide is affected by factors such as the crystallization and comparison area of its own.Among them, titanium dioxide hollow micro -balls have a good crystallization, porous, and large -scale surface area (reaction area). It has huge application prospects.There are many ways to prepare titanium dioxide microspheres, such as water heat method, but traditional preparation methods are usually performed in closed and high -pressure reactors. This method is difficultEssence Invention content [0003] In order to solve the lack of existing technology, the p...

Claims

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Application Information

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IPC IPC(8): C01G23/053B01J21/06B01J35/10
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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