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Synthetic method of titanium dioxide self-assembled particles

A technology of titanium dioxide and synthesis methods, applied in the direction of titanium dioxide, titanium oxide/hydroxide, nanotechnology, etc., can solve the problems of equipment and experimenter hazards, operation hazards, etc., and achieve the effect of rich variety, easy operation, and loose preparation conditions

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The usual hydrothermal method can realize the shape control of titanium dioxide, but the previously disclosed materials mostly use highly corrosive acids or alkalis as solvents, which is dangerous to operate and may cause harm to equipment and experimenters

Method used

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  • Synthetic method of titanium dioxide self-assembled particles
  • Synthetic method of titanium dioxide self-assembled particles
  • Synthetic method of titanium dioxide self-assembled particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] At room temperature and under magnetic stirring conditions, 20 mL of tetraisopropyl titanate was dropped into 120 mL of ultrapure water at 10 mL / min, and white flocculent precipitates gradually appeared. Add 40mL of 25wt% tetrapropylammonium hydroxide aqueous solution to the above system at 20mL / min, and the white precipitate in the solution gradually disappears. Transfer the above solution to a 200mL static reaction kettle, seal it, and put it into a 120°C drying oven to react for 24 hours. Take out the reaction kettle, and after cooling down to room temperature naturally, the white powder will be separated by centrifugation. Washed with ultrapure water three times, each time the white powder was separated by centrifugation at a speed of 8000 rpm, and finally dried at 70°C for 24 hours to collect the white powder and obtain product A for scanning and transmission electron microscope observation. SEM results show that the appearance is cauliflower-like, with a size of ...

Embodiment 2

[0044] According to the process of Example 1, with TiCl 4 For titanium precursor, TiCl 4 The addition amount was 5 mL, and the sample treatment conditions were the same as in Example 1 to obtain product B, which was used for scanning electron microscopy and transmission observation. The SEM results show that the appearance is a mixture of cauliflower and rod shapes, the size of the cauliflower shape is about 200nm, the length of the rod shape is about 300 nm, and the diameter is about 50nm; the electron diffraction results of the transmission electron microscope show that the titanium dioxide is an anatase structure; the high resolution results of the transmission electron microscope show that the titanium oxide particles are It is formed by axial self-assembly of anatase titanium dioxide nanowires.

Embodiment 3

[0046] According to the process of Example 1, 25mL of tetraisobutyl titanate was dropped into 120mL of deionized water to form a white flocculent precipitate, and 30mL of 15wt% tetramethylammonium hydroxide aqueous solution was added to the above system at 20mL / min , the white precipitate in the system gradually disappeared and turned into a transparent solution. Transfer the above solution to a 200mL static reaction kettle, seal it, and put it in a 140°C drying oven to react for 12 hours. The reactor was taken out, and after being naturally cooled to room temperature, the white powder was separated by centrifugation, and the centrifugation speed was 7000rpm. The sample processing conditions were the same as in Example 1, and the product C was obtained, which was used for scanning and transmission electron microscope observation. The SEM results showed that the appearance was cauliflower-shaped and the size was about 300nm; the electron diffraction results of the transmission e...

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Abstract

The invention discloses a synthetic method of titanium dioxide self-assembled particles. According to the synthetic method, water is taken as a solvent, TiCl4 or an organic alkanol titanium oxide is taken as a titanium oxide precursor, an alkylammonium hydroxide is added as a protective agent, and cauliflower-shaped and rod-shaped titanium dioxide nanoparticles are synthesized via hydrothermal method. The synthetic method is simple; synthetic conditions are not strict; operation is simple; the prepared titanium dioxide nanoparticles possess cauliflower-shaped or rod-shaped appearance, and a structure which is formed via self-assembly of titanium dioxide nanowires along an axial direction. The synthesized titanium dioxide possesses relatively high photocatalytic activity.

Description

technical field [0001] The invention relates to a method for synthesizing anatase titanium oxide nanoparticles. Background technique [0002] Titanium dioxide is an important semiconductor material with a wide range of uses. It can be used as photocatalyst, absorbing material, gas sensor, humidity sensor, PTC element, surface coating, and even cosmetic additives. Titanium dioxide is widely favored by researchers because of its stable chemical properties, clean and pollution-free, non-toxic to the human body and low price. [0003] The uses of titanium dioxide powder are various, and the physical and chemical properties required for each use are also different, so it is necessary to synthesize a variety of titanium dioxide powders with different properties. Generally, the main factors affecting the physical and chemical properties of titanium dioxide are crystal form, shape, size, surface hydroxyl distribution and self-assembled structure. Titanium dioxide has three crystal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B82Y40/00
Inventor 郭长友沈智奇凌凤香王少军杨卫亚季洪海王丽华
Owner CHINA PETROLEUM & CHEM CORP
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