Preparation of doped titanium dioxide nano-tube

A technology of titanium dioxide and titanium dioxide lattice, applied in the field of nanomaterials, can solve the problems of difficult access and unfavorable doping ions, and achieve the effects of easy operation, controllable doping amount and good crystal shape

Inactive Publication Date: 2008-11-12
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrothermal method reacts titanium dioxide in a strong alkaline environment, which is not conducive to the existence of other doping ions, and the doping ions are not easy to enter the formed titanium dioxide lattice.

Method used

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  • Preparation of doped titanium dioxide nano-tube
  • Preparation of doped titanium dioxide nano-tube
  • Preparation of doped titanium dioxide nano-tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: In doped TiO 2 nanotube

[0015] 1. Preparation of In-doped TiO by sol-gel method 2 Nano powder. Take 12ml of tetrabutyl titanate and slowly drop it into a beaker mixed with 40ml of absolute ethanol, 2ml of deionized water and 1ml of hydrochloric acid. After stirring for half an hour, add 0.2ml of indium trichloride and drop it into the beaker; a transparent sol is obtained and left to stand. After a period of time, after gelling, it is dried at 100°C for 10-12 hours to obtain a dry gel; after grinding, it is calcined at 450°C for 2.5 hours and then taken out to obtain In-doped TiO 2 Nano powder.

[0016] 2. Doping 0.4g In with TiO 2 The nano powder was mixed with 18ml of 10mol / L NaOH solution and added to the reaction kettle for stirring. After half an hour, the autoclave was placed in an oven and heated to 110°C for 20 hours.

[0017] 3. Take out the reacted autoclave, after it cools naturally, centrifuge, pour off the supernatant, wash the precipitate with dei...

Embodiment 2

[0019] Example 2: N-doped TiO 2 nanotube

[0020] 1. Use TiCl 4 Preparation of N-doped TiO by hydrolysis 2 Nano powder. 25% ammonia water is added dropwise to 200mL under vigorous stirring, the concentration is about 0.1molL -1 In the titanium tetrachloride aqueous solution, a white precipitate was immediately produced in the system, and the addition of ammonia was stopped when the pH value of the system reached 5.5. Then it was allowed to stand and age for 24 hours, filtered, and the resulting precipitate was dried at 70°C, ground into powder, and sintered at 400°C for 4 hours. N-doped TiO 2 Nano powder

[0021] 2. Doping 0.4g N with TiO 2 The nano powder was mixed with 18ml of 10mol / L NaOH solution and added to the reaction kettle for stirring. After half an hour, the autoclave was placed in an oven and heated to 110°C for 20 hours.

[0022] 3. Take out the reacted autoclave, after it cools naturally, centrifuge, pour off the supernatant, wash the precipitate with deionized wate...

Embodiment 3

[0024] Example 3: N and Sn double-doped TiO 2 nanotube

[0025] 1. Preparation of N and Sn double-doped TiO by sol-gel method 2 Nano powder. Take 12ml of tetrabutyl titanate slowly drop into a beaker mixed with 40ml of absolute ethanol, 2ml of deionized water and 1ml of hydrochloric acid. After stirring for half an hour, add 0.2ml of tin tetrachloride, and after another half an hour, add 3ml of ammonia to obtain Transparent sol, let stand for a period of time, after gel, dry at 100℃ for 10-12 hours to obtain dry gel; after grinding, calcined at 450℃ for 2.5 hours, take it out to obtain N and Sn double-doped TiO 2 Nano powder.

[0026] 2. Double-doped TiO with 0.4g N and Sn 2 The nano powder was mixed with 18ml of 10mol / L NaOH solution and added to the reaction kettle for stirring. After half an hour, the autoclave was placed in an oven and heated to 110°C for 20 hours.

[0027] 3. Take out the reacted autoclave, after it cools naturally, centrifuge, pour off the supernatant, wash ...

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Abstract

The invention discloses a method for preparing a nanotube doped with titanium dioxide by a two-step presynthesis method. Firstly, a sol-gel method or a hydrolysis method and other methods are adopted to synthesize nano particles doped with the titanium dioxide for target elements; secondly, the nano particles are made into the nanotube doped titanium dioxide by the hydrolysis method. The method has simple and feasible process, wide and application range for the doped elements; moreover, the nanotube prepared by the method has thin tube wall, small tube diameter, large surface area, response to visible light, and wide application prospect in aspects such as photocatalysis, photosensing, photoelectric conversion and so on.

Description

【Technical Field】 [0001] The invention relates to a method for preparing doped titanium dioxide nanotubes, and belongs to the field of nanomaterials. 【Background technique】 [0002] Since the discovery that carbon nanotubes have excellent properties such as strong toughness, large specific surface area, and high strength, people have carried out extensive research on nanotubes of various materials. At the same time, because titanium dioxide has the advantages of low price and good stability, the application of titanium dioxide nanotubes in the degradation of organic matter, photoelectric conversion, photolysis of water to produce hydrogen, and optical sensors has attracted the attention of scientists around the world. [0003] However, because the band gap of titanium dioxide is 3.2eV, it can only absorb ultraviolet light with a wavelength of less than 387nm, while most of the sunlight is visible light, and the ultraviolet light only accounts for 5%. At present, the low utilizati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047
Inventor 曹亚安龙绘锦曹永强董江舟
Owner NANKAI UNIV
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