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Method for synthesizing anatase type crystallizing titanium dioxide nano nuclear-shell or shell structure material by water phase one-step method

An anatase type, titanium dioxide technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve problems such as difficult hydrolysis, and achieve the effects of strong operability, low cost, and simple process flow

Inactive Publication Date: 2009-06-24
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Different from the synthesis of other core-shell and hollow-shell structure semiconductor materials, due to the strong polarity of titanium ions, it is relatively difficult to control its hydrolysis. As an alternative, the alcoholysis of organic compounds of titanium as precursors is widely used, but the defects of this type of method are also prominent. In order to obtain the shell structure of crystallized titanium dioxide, high temperature sintering steps or special hydrothermal Reaction conditions are essential

Method used

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  • Method for synthesizing anatase type crystallizing titanium dioxide nano nuclear-shell or shell structure material by water phase one-step method
  • Method for synthesizing anatase type crystallizing titanium dioxide nano nuclear-shell or shell structure material by water phase one-step method
  • Method for synthesizing anatase type crystallizing titanium dioxide nano nuclear-shell or shell structure material by water phase one-step method

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Take 5g of commercially available polystyrene microsphere powder with a particle size of about 200nm, add 0.25g of cetyltrimethylammonium bromide as a dispersant and ultrasonically disperse it in 1000ml of pure water; Dissolve 30% aqueous hydrogen peroxide solution (ratio of 4 to the number of moles of titanium ions), adjust the pH of the solution to 7 with 2.5% ammonia water, and add 200ml of this solution to the above-mentioned polystyrene emulsion , at a temperature of 80-100 ° C, strong mechanical stirring and reflux reaction for 1 hour, centrifugation at a speed of 2500 rpm to obtain the product, the obtained product was washed three times with pure water and ultrasonically redispersed, and then re-centrifuged to precipitate, then washed with absolute ethanol and ultrasonically Redisperse, centrifuge, and dry to obtain a core-shell structure product.

[0030] The morphology of the resulting product was obtained by transmission electron microscopy (see Figure 1A ) ...

Embodiment 2

[0032] Take 5g of commercially available polystyrene microsphere powder with a particle size of about 200nm, add 0.25g of cetyltrimethylammonium chloride as a dispersant and ultrasonically disperse it in 1000ml of pure water; Dissolve 30% aqueous hydrogen peroxide solution (ratio of 4 to the molar number of titanium ions), adjust the pH of the solution to 3 with 2.5% ammonia water by mass, and add 200ml of this solution to the polystyrene emulsion , at a temperature of 80-100 ° C, strong mechanical stirring and reflux reaction for 1 hour, centrifugation at a speed of 2500 rpm to obtain the product, the obtained product was washed three times with pure water and ultrasonically redispersed, and then re-centrifuged to precipitate, then washed with absolute ethanol and ultrasonically Redisperse, centrifuge, and dry to obtain a product with a shell structure.

[0033] The morphology of the resulting product was obtained by transmission electron microscopy (see Figure 2A ) and sca...

Embodiment 3

[0035] Take 5g of commercially available polystyrene microsphere powder with a particle size of about 500nm, add 0.15g of dodecyltrimethylammonium bromide and 0.15g of dodecyltrimethylammonium chloride as dispersants and ultrasonically disperse in 1000ml In pure water; the orthotitanic acid precipitation is dissolved in 30% aqueous hydrogen peroxide solution (with the molar ratio of titanium ions being 4) with a mass percent concentration, and the pH of the solution is regulated by 2.5% ammonia solution 7. Add 200ml of this solution into the above polystyrene emulsion, at a temperature of 80-100°C, reflux with strong mechanical stirring for 1 hour, centrifuge at 2500rpm to obtain the product, wash the obtained product three times with pure water and redisperse it ultrasonically Afterwards, re-centrifuge to precipitate, then wash with absolute ethanol and redisperse by ultrasonication, centrifuge to precipitate, and dry to obtain a core-shell structure product.

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Abstract

The invention relates to a preparation method of a core-shell-empty-shell structure material, in particular to a method for one-step synthesis of anatase-type crystallized titanium dioxide nano-core-shell or empty-shell structure material in an aqueous phase. In the present invention, the water-soluble titanium peroxide precursor is used for the first time to coat the nano-titanium oxide layer on the surface of polystyrene through the sol-gel method, and the shell-layer titanium oxide is directly crystallized into anatase nano-titanium dioxide at a relatively low temperature in the water phase without sintering. Not only that, through the control of the precursor, after the shell layer is formed and crystallized, the polystyrene core as the template can be dissolved spontaneously, so that the nano-titanium dioxide hollow shell structure can be directly obtained in the water phase. Compared with the traditional preparation method, the method of the present invention has simple flow, strong operability, relatively low cost, is suitable for batch preparation, has the possibility of industrial production, and is suitable for environmental purification, drug transportation, photonic crystals, etc. It has broad application prospects.

Description

technical field [0001] The invention relates to a preparation method of a core-shell-empty-shell structure material, in particular to a method for one-step synthesis of anatase-type crystallized titanium dioxide nano-core-shell or empty-shell structure material in an aqueous phase. Background technique [0002] Core-shell and hollow-shell nanomaterials have great application prospects in the fields of catalysis, chromatography, protection of biologically active reagents, wastewater treatment, macromolecular slow-release systems, etc., and the controllable preparation of core-shell and hollow-shell nanomaterials is becoming increasingly The focus of people's research. Due to the photocatalytic activity of the nano-titanium dioxide core-shell and empty-shell structure, it has a wide range of application prospects in the fields of environmental purification, catalysis, coatings, photoelectric conversion, etc.; not only that, due to the low absorption of titanium dioxide in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053
Inventor 只金芳吴良专
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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