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Magnetic titanium dioxide hollow ball and preparation method thereof

A titanium dioxide and hollow sphere technology is applied in the magnetic titanium dioxide hollow sphere and its preparation. Controllable thickness and easy operation

Inactive Publication Date: 2009-05-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steps of this method are simple, but the prepared TiO 2 Hollow spheres are uneven in size
[0004] In 2006, the Chinese invention patent "A Preparation Method of Mesoporous Hollow Spherical Titanium Dioxide Powder" (CN1834021A) reported that titanium tetrachloride was used as a precursor to prepare TiO with a mesoporous hollow spherical structure by spray drying. 2 particles, but the size of spherical particles prepared by this method is not uniform, and there are certain requirements for equipment
[0005] Some TiO 2 The preparation method of hollow spheres, however, while the synthesis method is becoming more and more mature, TiO 2 The recycling of hollow spheres after use has received less attention, and TiO 2 Particles are light, so it is not easy to precipitate, filter and recover
And the magnetic TiO 2 Hollow ball, not only has TiO 2 Excellent photocatalytic performance, and easy fluidization and separation and recovery, so the development of magnetic TiO 2 Hollow spheres have certain innovation and obvious practical application value, so far, no magnetic TiO 2 Hollow ball related news

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of polystyrene template spheres with a size of 560 nm

[0031] At room temperature, 220 mL of deionized water and 26 mL of styrene were added to a three-neck flask protected by nitrogen, and stirred at 300 rpm for 30 minutes, then the temperature was raised to 70°C in a water bath at a rate of 1°C / min. Then, 20 mL of an aqueous potassium persulfate solution with a concentration of 30 g / L was dropped into the three-necked flask, and reacted at 70° C. for 20 hours. After the reaction solution was cooled to room temperature, it was centrifuged and washed twice with deionized water and ethanol to obtain polystyrene template spheres.

[0032] (2) Preparation of polystyrene spheres coated with cobalt ferrite precursor

[0033] At room temperature, ultrasonically disperse 80 mg template polystyrene spheres in 50 mL of a mixed salt solution of cobalt nitrate and ferric chloride for 20 minutes, wherein the molar concentration of divalent cobalt ions is 0.025 mol...

Embodiment 2

[0039] (1) Preparation of polystyrene template spheres with a size of 560 nm

[0040] At room temperature, 220 mL of deionized water and 26 mL of styrene were added to a three-neck flask protected by nitrogen, and stirred at 300 rpm for 30 minutes, then the temperature was raised to 70°C in a water bath at a rate of 1°C / min. Then, 20 mL of an aqueous potassium persulfate solution with a concentration of 30 g / L was dropped into the three-necked flask, and reacted at 70° C. for 20 hours. After the reaction solution was cooled to room temperature, it was centrifuged and washed twice with deionized water and ethanol to obtain polystyrene template spheres.

[0041] (2) Preparation of polystyrene spheres coated with cobalt ferrite precursor

[0042] At room temperature, ultrasonically disperse 80 mg template polystyrene spheres in 50 mL of a mixed salt solution of cobalt nitrate and ferric chloride for 20 minutes, wherein the molar concentration of divalent cobalt ions is 0.025 mol...

Embodiment 3

[0048] (1) Preparation of polystyrene template spheres with a size of 560 nm

[0049] At room temperature, 220 mL of deionized water and 26 mL of styrene were added to a three-neck flask protected by nitrogen, and stirred at 300 rpm for 30 minutes, then the temperature was raised to 70°C in a water bath at a rate of 1°C / min. Then, 20 mL of an aqueous potassium persulfate solution with a concentration of 30 g / L was dropped into the three-necked flask, and reacted at 70° C. for 20 hours. After the reaction solution was cooled to room temperature, it was centrifuged and washed twice with deionized water and ethanol to obtain polystyrene template spheres.

[0050] (2) Preparation of magnetic cobalt ferrite hollow spheres

[0051] At room temperature, ultrasonically disperse 80 mg template polystyrene spheres in 50 mL of a mixed salt solution of cobalt nitrate and ferric chloride for 20 minutes, wherein the molar concentration of divalent cobalt ions is 0.025 mol / L, and the molar ...

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Abstract

The invention provides a magnetic titanium dioxide hollow sphere and a preparation method thereof, which belong to the technical field of magnetic nanomaterials. The magnetic TiO2 hollow sphere is characterized by the monodisperse property, contains magnetic cobalt ferrite and anatase TiO2 with the photocatalytic activity, and has the following formula: TiO2 / CoFe2O4. The magnetic TiO2 hollow sphere is prepared by the template method. The magnetic component is spinel ferrite prepared by the co-precipitation method. The TiO2 precursor is titanium tetrachloride. The magnetic TiO2 hollow sphere has the advantages that the magnetic material has the characteristics of light weight and large specific surface area, has photocatalytic property, can decompose organic dyes, and is enriched and recovered by an applied magnetic field. Furthermore, the preparation method adopts inexpensive titanium tetrachloride as the TiO2 precursor and adopts water as a reaction medium, and has the advantages of easy operation, easy promotion, good economic benefit and environmental protection. Additionally, the particle size and the shell thickness of the magnetic TiO2 hollow sphere are adjustable and controllable, and can meet various needs in practical application. The magnetic TiO2 hollow sphere has good application prospects in the fields of photo-catalysis, photocells, gas sensors and the like.

Description

technical field [0001] The invention belongs to the technical field of magnetic nanomaterials, in particular to a magnetic titanium dioxide (TiO 2 ) hollow spheres and a preparation method thereof, monodisperse magnetic titanium dioxide hollow spheres with photocatalytic properties. technical background [0002] Hollow spheres with a particle size of nanometer to micrometer have certain stability and surface permeability, and have a large specific surface area and low density. As a new type of functional material, hollow spheres have been used in the fields of catalysis, biomedicine, environmental protection, and materials, such as catalysts, drug carriers, shape-selective adsorbents, and chemical sensors. Titanium dioxide (TiO 2 ) is an n-type semiconductor compound, the shape and size of the particles will have an important impact on its optical and electrical properties, therefore, TiO 2 Hollow spheres have great application potential in the fields of photocatalysts, p...

Claims

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Application Information

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IPC IPC(8): B01J23/74B01J21/06B01J35/08
Inventor 张慧侯荣郤玉生段雪
Owner BEIJING UNIV OF CHEM TECH
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