Titanium dioxide hollow nanosphere and preparation method thereof

A hollow nano, titanium dioxide technology, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of increasing time and labor costs, existing dangers, hidden dangers of environmental pollution, etc., to improve utilization rate, size Uniform, highly reproducible results

Inactive Publication Date: 2014-10-01
ZHEJIANG NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The hard template method is a common method for synthesizing a large number of titanium dioxide hollow structures with uniform size and regular structure. However, this method has its own obvious weaknesses, mainly because it requires additional steps to remove the template after wrapping the titanium dioxide shell.
The silicon dioxide template is the most common hard template. In the process of etching silicon dioxide, on the one hand, time and labor costs are increased; on the other hand, etching requires the use of hydrofluoric acid or concentrated sodium hydroxide solution. It is dangerous in actual operation and has potential pollution hazards to the environment

Method used

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  • Titanium dioxide hollow nanosphere and preparation method thereof
  • Titanium dioxide hollow nanosphere and preparation method thereof
  • Titanium dioxide hollow nanosphere and preparation method thereof

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preparation example Construction

[0037] Correspondingly, the present invention also provides a preparation method of titanium dioxide hollow nanospheres, comprising the following steps:

[0038] a) mixing cyclohexane, nonionic surfactant, co-surfactant, deionized water and ammonia water, and stirring to obtain a first mixed solution;

[0039] b) Mix ethyl orthosilicate, N-aminoethyl-γ-aminopropyltrimethoxysilane and cyclohexane, then add them into the first mixed solution, and obtain a second mixed solution after stirring;

[0040] c) Add ethanol to the second mixed solution, and disperse into isopropanol after centrifugal cleaning to form O-SiO 2 Isopropanol solution of nanospheres, O means organic hybridization;

[0041] d) The O-SiO 2The isopropanol solution of nanoparticles is dispersed in a mixed solution containing isopropanol, deionized water and ammonia water to form a dispersion;

[0042] e) Inject the isopropanol solution of diisopropyl di(acetylacetonate) titanate into the dispersion, stir, cent...

Embodiment 1

[0056] a. In a 50ml glass bottle, mix cyclohexane, Tritox X-100, n-hexanol, deionized water and ammonia water evenly, with a volume ratio of 150:35:35:8:2, and stir until clear;

[0057] b. Mix 300 microliters of tetraethyl orthosilicate, 150 microliters of N-aminoethyl-γ-aminopropyltrimethoxysilane and 1 milliliter of cyclohexane evenly, then add it to the mixed solution in the previous step at one time, and stir 24 hours;

[0058] c. Add an equal volume of ethanol to the mixed solution formed in the previous step to demulsify, then centrifuge and wash, and then disperse it in 16 ml of isopropanol to form organic hybrid silica nanospheres (O-SiO 2 Nanospheres) in isopropanol solution, "O" means organic hybridization;

[0059] d. In a 50 ml glass bottle, mix isopropanol, deionized water and ammonia water to form a mixed solution, and 1 ml of O-SiO with a concentration of 0.1 mol / L 2 The nanosphere isopropanol solution is added to the aforementioned mixed solution to form ...

Embodiment 2

[0063] a. In a 50ml glass bottle, mix cyclohexane, Tritox X-100, n-hexanol, deionized water and ammonia water evenly, with a volume ratio of 150:35:35:8:2, and stir until clear;

[0064] b. Mix 300 microliters of tetraethyl orthosilicate, 150 microliters of N-aminoethyl-γ-aminopropyltrimethoxysilane and 1 milliliter of cyclohexane evenly, then add it to the mixed solution in the previous step at one time, and stir 24 hours;

[0065] c. Add an equal volume of ethanol to the mixed solution formed in the previous step to demulsify, then centrifuge and wash, and then disperse it in 16 ml of isopropanol to form organic hybrid silica nanospheres (O-SiO 2 Nanospheres) in isopropanol solution, "O" means organic hybridization;

[0066] d. In a 50 ml glass bottle, mix isopropanol, deionized water and ammonia water to form a mixed solution, and 1 ml of O-SiO with a concentration of 0.1 mol / L 2 The nanosphere isopropanol solution is added to the aforementioned mixed solution to form ...

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Abstract

The invention provides a titanium dioxide hollow nanosphere and a preparation method thereof. Firstly, a micro-emulsion method is utilized to compound organic hybridization silica nanosphere to provide a template for compounding the titanium dioxide hollow nanosphere. According to the invention, titanium diisopropoxide bis(acetylacetonate) is used as a titanium source to cladding a titanium dioxide shell; the uniform cladding of the titanium dioxide shell on the outer layer of O-SiO2 nano-particles is realized when an isopropanol solution of the titanium diisopropoxide bis(acetylacetonate) is filled into a dispersion liquid. According to the invention, spontaneous dissolution of an O-SiO2 template in an alkaline environment and the assisting corrosion effect of the shell are utilized to compound the titanium dioxide hollow nanosphere structure at one step. The preparation method is simple in process, easy to operate and excellent in repeatability; the titanium dioxide hollow nanosphere is uniform in size; the hollow structure effectively increases the specific area, facilitates photocatalysis and improves the photocatalysis activity; the titanium dioxide hollow nanosphere has the visible light responsive property and is high in visible light utilization efficiency.

Description

technical field [0001] The invention relates to the technical field of inorganic nanomaterials, in particular to a titanium dioxide hollow nanosphere and a preparation method thereof. Background technique [0002] Titanium dioxide (TiO 2 ) as a non-toxic, stable and efficient photocatalyst has been widely used in the fields of life and environmental protection such as coatings, antibacterial agents, water treatment, and pollutant degradation. As a photocatalyst, under the irradiation of ultraviolet light, the electrons on the valence band of titanium dioxide jump to the conduction band, generating electron-hole pairs, then the electrons and holes are separated, migrate to the surface of titanium dioxide, and then interact with water and oxygen around the surface Oxygen-containing free radicals are produced, and the formed oxygen-containing free radicals have super-strong oxidizing ability, which can oxidize most organic matter and completely degrade them into carbon dioxide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B01J21/06B82Y30/00B82Y40/00
Inventor 李正全李磊郑蒙蒙周诗琪
Owner ZHEJIANG NORMAL UNIVERSITY
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