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Preparation method of composite titanium dioxide nanoparticles

A nanoparticle, titanium dioxide technology, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of limited photocatalytic activity, blocking irradiation, etc., and achieve uniform size, easy operation, and stable particle structure Effect

Inactive Publication Date: 2015-10-28
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the composites of titanium dioxide and noble metals use the composite form of depositing noble metals on the surface of titanium dioxide. However, the above-mentioned composite forms have structural defects, that is, the noble metal partially blocks the light from the semiconductor on the surface, and the improvement of photocatalytic activity is relatively limited. , so it is necessary to find a better composite structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] S1. Disperse 35 parts of ethyl titanate in 96 parts of organic solvent through ultrasonic oscillation equipment, add 3.6 parts of amine salt, stir evenly at room temperature, put the reaction solution in the reaction kettle, and react for 2 hours under the condition of 160°C , naturally cooled to room temperature, separated the solid phase, and obtained powder;

[0027] S2. Put the product obtained in step S1 into a mixing mixer, add 2 parts of flame retardant synergist, 5 parts of brominated flame retardant, and 0.1 part of heat stabilizer in sequence to obtain a mixed material;

[0028] S3. Put the mixed material obtained in step S2 into a twin-screw extruder, control the screw speed to 180rpm, fill the delivery pump with liquid carbon dioxide, control the delivery pressure to 7.4MPa, and heat the carbon dioxide to the critical temperature (31°C), After converting it into supercritical carbon dioxide, inject it into the third-fourth zone and fifth-eighth zone of the e...

Embodiment 2

[0034] S1. Disperse 38 parts of ethyl titanate in 110 parts of organic solvent through ultrasonic oscillation equipment, add 4.1 parts of amine salt, stir evenly at room temperature, put the reaction solution in a reaction kettle, and react for 3.5 hours at 280°C Afterwards, naturally cool to room temperature, separate the solid phase, and obtain powder;

[0035] S2. Put the product obtained in step S1 into a mixing mixer, add 6 parts of flame retardant synergist, 7 parts of brominated flame retardant, and 1 part of heat stabilizer in sequence to obtain a mixed material;

[0036] S3. Put the mixed material obtained in step S2 into a twin-screw extruder, control the screw speed to 600rpm, fill the delivery pump with liquid carbon dioxide, control the delivery pressure to 50MPa, and heat the carbon dioxide to the critical temperature (31°C), so that After it is converted into supercritical carbon dioxide, it is injected into the third-fourth zone and fifth-eighth zone of the ext...

Embodiment 3

[0042] S1. Disperse 36.5 parts of ethyl titanate in 103 parts of organic solvent through ultrasonic oscillation equipment, add 3.85 parts of amine salt, stir evenly at room temperature, put the reaction solution in a reaction kettle, and react for 2.75 hours at 220°C Afterwards, naturally cool to room temperature, separate the solid phase, and obtain powder;

[0043] S2. Put the product obtained in step S1 into a mixing mixer, add 4 parts of flame retardant synergist, 6 parts of brominated flame retardant, and 0.55 parts of heat stabilizer in sequence to obtain a mixed material;

[0044] S3. Put the mixed material obtained in step S2 into a twin-screw extruder, control the screw speed to 390rpm, fill the delivery pump with liquid carbon dioxide, control the delivery pressure to 28.7MPa, and heat the carbon dioxide to the critical temperature (31°C), After converting it into supercritical carbon dioxide, inject it into the third-fourth zone and fifth-eighth zone of the extruder...

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PUM

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Abstract

The invention discloses a preparation method of composite titanium dioxide nanoparticles. The preparation method comprises the following steps: dispersing titanium ethoxide in an organic solvent through ultrasonic oscillation equipment, adding amine salt, uniformly stirring at room temperature, placing a reaction solution into a reaction vessel and reacting for 2-3.5h, naturally cooling to room temperature, separating out a solid phase, placing the solid phase into a mixing agitator, successively adding a flame retardant synergist, a brominated flame retardant and a heat stabilizer, uniformly mixing, pouring the mixture into a twin-screw extruder, and injecting supercritical carbon dioxide to obtain mixed powders; dispersing the mixed powders into a mixed solution containing isopropanol, deionized water and ammoniacal liquor through the ultrasonic oscillation equipment so as to form a dispersion; and adding the dispersion into an aqueous solution of chloroauric acid, stirring in a dark place, conducting an ultrasonic reaction and drying so as to obtain the composite nanoparticles. The preparation method has a simple process, is easy to operate and has good repeatability. The prepared composite nanoparticles have advantages of stable granule structure, uniform size, flame retardance, heat resistance and corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of inorganic nanomaterials, in particular to a method for preparing composite titanium dioxide nanoparticles. Background technique [0002] Titanium dioxide (TiO 2 ) as a non-toxic, stable, and efficient photocatalyst has been widely used in environmental and energy fields such as water treatment, pollutant degradation, and solar cells. As a photocatalyst, the electrons in the valence band of titanium dioxide jump to the conduction band under the excitation of ultraviolet light, generating electron-hole pairs, then the electrons and holes are separated, migrate to the surface of titanium dioxide, and then react with water and oxygen around the surface to generate Oxygen-containing free radicals, the formed oxygen-containing free radicals have super-strong oxidizing ability, can oxidize most organic matter, and completely degrade them into carbon dioxide and water. However, in practical applications, it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38C01G23/053B82Y30/00B82Y40/00
CPCY02P20/54
Inventor 邢锦娟冉林涛张艳萍
Owner BOHAI UNIV
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