Synthetic method of self-assembly nano titanium dioxide

A technology of titanium dioxide and self-assembly, applied in the direction of titanium dioxide, titanium oxide/hydroxide, nanotechnology, etc., can solve the problems of environmental pollution and high cost, and achieve the effects of reducing environmental pollution, large product output and loose reaction conditions

Active Publication Date: 2016-12-07
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0011] Patent CN103771505A discloses a synthesis method of self-assembled titanium dioxide. Organic ammonium hydroxide is used as template and peptizer, titanate is hydrolyzed in water, and hydrothermal reaction is performed at low temperature to prepare titanium dioxide with self-assembled structure. The method requires a high concentration of organic ammonium hydroxide, which is costly and causes environmental pollution

Method used

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  • Synthetic method of self-assembly nano titanium dioxide

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Embodiment 1

[0042] Mix 100 mL of ethanol aqueous solution at a volume ratio of 1:1, and drop 10 mL of tetraisopropyl titanate into the ethanol aqueous solution at room temperature and magnetic stirring at a rate of 10 mL / min, and a white colloidal solution gradually appears. After stirring for 20 minutes, 5 mL of 25 wt % tetraethylammonium hydroxide aqueous solution was added, and stirring was continued for 30 minutes. Transfer the above solution to a 500mL static reaction kettle, seal it, put it into a 100°C drying oven for 24 hours of constant temperature reaction, add 10 grams of ammonium bicarbonate, raise the temperature to 120°C, and react at a constant temperature for 24 hours. Take out the reaction kettle, and after cooling down to room temperature naturally, the white powder will be separated by centrifugation. Wash with distilled water three times, and separate the white powder by centrifugation each time. The centrifugation speed is 8000rpm, and finally dry at 70°C for 24 hours...

Embodiment 2

[0044] According to the experimental process of Example 1, the ratio of the aqueous ethanol solution is 1:2, and tetraisobutyl titanate is used as the titanium source. The sample processing conditions were the same as in Example 1 to obtain product B. It is used for transmission electron microscope observation. The transmission electron microscope results show that the particle size of titanium dioxide is about 65 nanometers, and has a self-assembled structure. The diameter of the assembled spindle fiber is 9 nanometers and the length is 55 nanometers.

Embodiment 3

[0046] According to the experimental process of Example 1, 10 mL of 30 wt % tetraethylammonium hydroxide aqueous solution was added, and the sample treatment conditions were the same as in Example 1 to obtain product C. For transmission electron microscope observation, the transmission electron microscope results show that the particle size of titanium dioxide is about 85 nanometers, and has a self-assembled structure. The diameter of the assembled spindle fiber is 12 nanometers and the length is 78 nanometers.

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Abstract

The invention discloses a synthetic method of self-assembly nano titanium dioxide. According to the method, a titanium oxide precursor is hydrolyzed in an ethanol aqueous solution, low-concentration alkyl ammonium hydroxide is added as a protective agent, low-temperature hydro-thermal pretreatment is employed; weak alkali salt is added, a hydro-thermal reaction is re-carried out under high temperature to form the dendritic titanium dioxide self-assembly particles. The method has the characteristics of low reaction temperature, high output, little usage amount of alkyl ammonium hydroxide, and little pollution.

Description

technical field [0001] The invention relates to a method for synthesizing titanium dioxide nanoparticles, in particular to a method for synthesizing self-assembled nanometer titanium dioxide particles. Background technique [0002] Titanium dioxide is an important semiconductor material. It has many excellent properties such as stable chemical performance, low price, clean and pollution-free, and good biocompatibility. It especially has very high photocatalytic activity. It is considered to be the most promising green material. Environmentally friendly photocatalysts have always been a research hotspot in the field of heterogeneous photocatalysis. [0003] TiO 2 There are many synthetic methods, which can be roughly divided into gas-phase method and liquid-phase method. TiCl 4 Steam and oxygen react instantly at high temperature to produce titanium dioxide powder. This method has harsh experimental conditions, requires high temperature, and is highly corrosive to equipmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047B82Y30/00
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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