Bowl-shaped particle or dumbbell-shaped hollow particle of titanium dioxide and preparation method thereof

A titanium dioxide, dumbbell-shaped technology, applied in the directions of titanium dioxide, titanium oxide/hydroxide, nanotechnology, etc., can solve problems such as inability to prepare individual bowl-shaped particles, inability to adapt to industrial production, and easy occurrence of voids at the bottom of the bowl, without the need for Precision equipment, smooth bowl edges, mild conditions

Inactive Publication Date: 2011-12-14
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot prepare individual bowl-shaped particles, and the prepared bowl-shaped bottom is prone to voids due to PS occupation, and the equipment requirements are high, which cannot be adapted to industrial production

Method used

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  • Bowl-shaped particle or dumbbell-shaped hollow particle of titanium dioxide and preparation method thereof
  • Bowl-shaped particle or dumbbell-shaped hollow particle of titanium dioxide and preparation method thereof
  • Bowl-shaped particle or dumbbell-shaped hollow particle of titanium dioxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0020] Weigh 1 g of dumbbell-shaped PS microspheres and disperse them into 120 g of concentrated sulfuric acid, and modify them at a constant temperature of 24 hours at 30 °C to form a hydrophilic layer on the surface of PS. The long diameter of the dumbbell-shaped PS microspheres is 7.2 μm and the short diameter is 5 μm. Disperse the modified dumbbell-shaped PS into isopropanol solution of butyl titanate (60% concentration by mass), and stir at 30°C for 24 hours to make the modified dumbbell-shaped PS fully adsorb butyl titanate. Then centrifuge, then disperse into water, react for 8h and centrifuge to get PS / TiO 2 Core-shell particles. Finally put the PS / TiO 2 Core-shell particles are sintered at a sintering temperature of 450°C, and the heating rate is 100°C / min to obtain anatase TiO 2 Bowl-shaped particles. Such as figure 1 As shown, the diameter of the mouth of the bowl-shaped structure is 3.35 μm, the diameter of the bowl body is 5.02 μm, the height is 3.6 μm, the th...

Embodiment example 2

[0022] Weigh 1g of dumbbell-shaped PS microspheres and disperse them into 10g of concentrated sulfuric acid, and modify them at a constant temperature of 80°C for 2h to form a hydrophilic layer on the surface of PS. The long diameter of the dumbbell-shaped PS microspheres is 5.4 μm and the short diameter is 3.5 μm. Disperse the modified dumbbell-shaped PS into an ethanol solution of isobutyl titanate (50% by weight concentration), and stir at 20°C for 24 hours to make the modified dumbbell-shaped PS adsorb isobutyl titanate. Then centrifuge, disperse into water, react for 8h and then centrifuge to get PS / TiO 2 Core-shell particles. Finally put the PS / TiO 2 Core-shell particles are sintered at a sintering temperature of 430°C and a heating rate of 120°C / min to obtain anatase TiO 2 Bowl-shaped particles. Such as figure 2 As shown, the diameter of the mouth of the bowl-shaped structure is 3.15 μm, the diameter of the bowl body is 3.44 μm, the height is 2.68 μm, the thickness...

Embodiment example 3

[0024] Weigh 1g of dumbbell-shaped PS microspheres and disperse them into 800g of concentrated sulfuric acid, and modify them at a constant temperature of 50°C for 16 hours to form a hydrophilic layer on the surface of PS. The long diameter of the dumbbell-shaped PS microspheres is 5.4 μm and the short diameter is 4 μm. Disperse the modified dumbbell-shaped PS into an ethylene glycol solution of isopropyl titanate (concentration: 70% by mass), and stir at 50°C for 12 hours to make the modified dumbbell-shaped PS adsorb isopropyl titanate. Then centrifuge and disperse into water, centrifuge and wash after 36h to obtain PS / TiO 2 Core-shell particles. Finally put the PS / TiO 2 Core-shell particles are sintered at a sintering temperature of 350°C, and the heating rate is 5°C / min to obtain anatase TiO 2 Bowl-shaped particles. Such as image 3As shown, the dumbbell-shaped particles are connected by two spherical caps, the long diameter is 5.65 μm, the short diameter is 4.2 μm, th...

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Abstract

The invention belongs to the field of chemical engineering and new materials, and particularly relates to titanium dioxide bowl-shaped particles or dumbbell-shaped hollow particles and a preparation method thereof. The preparation method is characterized by firstly carrying out sulfonation modification on dumbbell-shaped polystyrene (PS) microspheres used as a template with concentrated sulfuric acid, then adsorbing a titanium dioxide precursor, then hydrolyzing to obtain dumbbell-shaped PS / TiO2 core-shell particles, and finally sintering the core-shell structure at different heating rates toobtain TiO2 particles with various morphologies. The crystal form of a product is controlled through the sintering temperature; the bowl-shaped or dumbbell-shaped hollow structure of the product is controlled through the heating rate; the surface roughness of the product can be effectively controlled through controlling the cross-linking degree of the dumbbell-shaped PS template; and the shell thickness of the product can be controlled through controlling the sulfonation modification time. Through the preparation method provided by the invention, not only are independent and beautiful bowl-shaped particles prepared, but also the preparation method is simple to operate, sophisticated equipment is not needed, the yield is more than 98%, the preparation method is suitable for industrial production, and the product can be massively prepared.

Description

technical field [0001] The invention belongs to the field of chemical engineering and new materials, and in particular relates to a preparation method of titanium dioxide bowl-shaped particles or titanium dioxide dumbbell-shaped hollow particles with controllable appearance. Background technique [0002] Titanium dioxide (TiO 2 ) is a new type of inorganic material with stable physical and chemical properties, safety, non-toxicity and low cost. It is widely used in photocatalysis, solar cells, coatings, sunscreen cosmetics, sensors and ceramic materials with excellent optical and electrical properties and white pigment properties. field. Anatase TiO 2 Due to their excellent photocatalytic properties, particles have been widely used in the fields of sewage treatment, antibacterial disinfection and air purification. Therefore, titanium dioxide has become a research hotspot at home and abroad, and titanium dioxide particles with various morphologies have been successfully sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047B82Y40/00
Inventor 杨穆王戈吴强陈瑜王倩
Owner UNIV OF SCI & TECH BEIJING
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