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Prepn. process of mesic hole hollow ball-shape titania powder

A technology of hollow spherical titanium dioxide, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of changing the catalytic performance and photocatalytic performance of mesoporous hollow spherical titanium dioxide powder, affecting the popularization and application, etc., so as to facilitate the scale-up experiment and process Good process and good photocatalytic performance

Inactive Publication Date: 2007-11-14
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These residual impurities will change the catalytic performance and photocatalytic performance of mesoporous hollow spherical titanium dioxide powder, thus affecting the promotion and application of titanium dioxide powder in industry and environmental protection

Method used

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  • Prepn. process of mesic hole hollow ball-shape titania powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Fix a three-necked bottle with a capacity of 500mL in an ice-water bath, take 200mL of deionized water and put it into the three-necked bottle; install a condenser tube on the middle port of the three-necked bottle, and use tap water to condense; install a contact type on one port of the three-necked bottle Thermometer to monitor and control the temperature of the reaction system; take TiCl 4 Put 100mL into a dry constant-pressure separating funnel, and install the constant-pressure separating funnel on the other side port of the three-necked flask; under the condition of magnetic stirring and ice-water bath cooling, turn on the switch of the constant-pressure separating funnel, Titanium chloride solution is slowly dropped into deionized water, and the temperature of the entire dropping and mixing process is controlled at about 20°C by controlling the dropping speed and the temperature of the ice-water bath; with the addition of titanium tetrachloride, the color of t...

Embodiment 2

[0041] (1) adopt the device described in step (1) in embodiment 1, get pure water (H 2 (2) 300mL is packed into there-necked bottle; Get TiCl 4 Put 100mL into a dry constant-pressure separating funnel; under the conditions of magnetic stirring and ice-water bath cooling, turn on the switch of the constant-pressure separating funnel, slowly drop the titanium tetrachloride solution into pure water, and control the dropping speed and The temperature of the ice-water bath keeps the temperature of the entire dropping and mixing process at about 5°C; after the addition of titanium tetrachloride is completed, continue to stir for 2 hours. At this time, the mixed system is a light yellow-green sol. Cool it to room temperature and place it ;

[0042] (2) adopt the device described in step (2) in embodiment 1, after titanium tetrachloride aqueous sol is placed 50 hours, get 100mL above-mentioned sol and pack in the there-necked bottle of 500mL; Take H 2 O 300mL was put into a dry cons...

Embodiment 3

[0046] (1) adopt the device described in step (1) in embodiment 1, get pure water (H 2 (2) 100mL is packed into there-necked bottle; Get TiCl 4 Put 100mL into a dry constant-pressure separating funnel; under the conditions of magnetic stirring and ice-water bath cooling, turn on the switch of the constant-pressure separating funnel, slowly drop the titanium tetrachloride solution into pure water, and control the dropping speed and The temperature of the ice-water bath keeps the temperature of the entire dropping and mixing process at about 30°C; after the titanium tetrachloride is added dropwise, continue stirring for another 2 hours. At this time, the mixed system is a light yellow-green sol. Cool it to room temperature and place it ;

[0047] (2) Adopt the device and equipment described in step (2) in Example 1, after placing the titanium tetrachloride hydrosol for 30 hours, get 100mL of the above-mentioned sol and pack it into a 500mL there-necked bottle; get 350mL of deio...

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Abstract

This invention relates to a method to prepare mezoporous empty-centered titanium dioxide powders, which comprises following steps: titanium chloride is made into hydrosol with pure water, diluted and introduced into a spray dryer for spray drying. The subsequent product is empty-centered ball-shaped powder made up of nanosized titanium dioxide particles and the preceding titanium chloride is titanium tetrachloride or titanium trichloride. The titanium dioxide particles prepared in this invention all have mezoporous empty-centered ball-shaped structure and the empty-centered wall is made up of nanosized titanium dioxide particles and mezopores, on the surface of which titanium atoms possess a fraction of as high as 70%. As only titanium tetrachloride is adopted as precursor and no other reagent is necessary, the product is highly pure and has excellent photocatalytic properties. This method has the advantages of high yield, low cost, easily controlled technique and convenience for magnification experiment. Besides, there are not severe requirements for facilities and this method is suitable for industrial production.

Description

(1) Technical field [0001] The invention relates to a method for preparing mesoporous hollow spherical titanium dioxide powder. (2) Background technology [0002] Since the preparation of porous titanium dioxide powder was reported in 1995, due to its wide range of uses, it can be used not only as a filler for composite materials with low dielectric constant and low specific gravity, but also as a carrier for slow-release microcapsule systems and drug delivery. In the field of catalysis, the catalyst can also be filled into the hollow to improve the catalytic performance. Therefore, its preparation has attracted extensive attention. At present, there have been many reports on the preparation methods of porous titanium dioxide powder in domestic and foreign literatures, but these methods are all based on the template method, that is, cellulose, micromicelle, polypropylene microsphere or microsuspension are required template, and in the subsequent processing process, the abo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053
Inventor 李国华
Owner ZHEJIANG UNIV OF TECH
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