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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 directions of titanium dioxide, titanium oxide/hydroxide, etc., can solve problems such as difficulty in hydrolysis, and achieve the effects of strong operability, simple method and process, and wide application prospects.

Inactive Publication Date: 2007-11-28
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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
Comparison scheme
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 obtained product was characterized by a transmission electron microscope (see FIG. 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 obtained product was characterized by a transmission electron microscope (see FIG. 2A ) and a...

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 Then re-centrifuge to precipitate, then wash with absolute ethanol and ultrasonically redisperse, centrifuge to precipitate, and dry to obtain a core-shell structure product.

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Abstract

The present invention relates to preparation process of core-shell material and hollow material, and is especially water phase one-step synthesis process for preparing nanometer crystallized anatase type titania material in core-shell and hollow structure. Water soluble titanium peroxide precursor is treated through a sol-gel process so as to coat a nanometer titania layer onto the surface of polystyrene, and the nanometer titania layer in the shell is crystallized directly at relatively low temperature to form nanometer anatase type titania without needing sintering. Furthermore, the precursor may be controlled properly, so that the polystyrene core serving as the template may be dissolved spontaneously after the shell is formed and crystallized and nanometer hollow titania may be obtained directly in water phase. The present invention is simple, easy to operate, low in cost and suitable for batch production, and may find wide application in different aspects.

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 Applications(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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