Titanium oxide nano tube and preparing method thereof

A titanium oxide, titanate nanotube technology, applied in the direction of titanium oxide/hydroxide, titanium dioxide, etc., can solve the problems of thick nanotube diameter, harsh condition control requirements, harsh condition control, etc., and achieve easy large-scale industrial production. , the speed environment is friendly, the conditions are easy to control the effect

Inactive Publication Date: 2004-09-15
TSINGHUA UNIV
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Problems solved by technology

Synthesis of TiO by Template Method 2 The morphology of nanotubes is directly affected by the uniformity and thickness of the pore structure of the template. At the same time, the synthesis process also has a great influence on the product, and the condition control requirements are relatively strict. For example, the morphology of the product is very sensitive to the time of impregnation. To obtain Nanotubes, the impregnation time is very short, usually a few seconds, so it is difficult to achieve industrial mass production
The shorter the immersion time, the thinner the tube wall obtained, and the longer the immersion time, only nanowires can be obtained, and the obtained nanotubes are usually amorphous TiO 2 , and the tube wall is usually composed of nanoparticles, due to the limitation of the template, the diameter of the nanotube is relatively large, and the specific surface area is relatively small, and the sol-gel method usually requires expensive organic alkoxides as raw materials. High cost, not suitable for

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  • Titanium oxide nano tube and preparing method thereof
  • Titanium oxide nano tube and preparing method thereof
  • Titanium oxide nano tube and preparing method thereof

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Example Embodiment

[0027] The preparation process of the present invention mainly includes the following two aspects:

[0028] 1. Preparation of titanate nanotubes using industrially produced titanium dioxide as a raw material

[0029] This method of preparing titanate nanotubes makes full use of the pulverization effect of ultrasonic to fully pulverize large-particle materials into fine particles, increase the contact area between the materials, and reduce the mass transfer resistance of the reaction; at the same time, it uses ultrasonic cavitation to produce The instantaneous local ultra-high temperature and ultra-high pressure accelerates the reaction, and then uses low-temperature hydrothermal crystallization to obtain titanate nanotubes. After post-treatment, titanate nanotubes are formed.

[0030] Process steps: mix 1 to 5 grams of industrially produced titanium dioxide with 40 ml of 5 to 20 moles / liter NaOH solution, place them in an ultrasonic generator, and perform ultrasonic chemical react...

Example Embodiment

[0035] Example 1

[0036] Preparation of titanate nanotubes

[0037] Weigh 1.0 g of industrially produced anatase titanium dioxide powder, put it in a conical flask, add 40 ml of 10 mol / l NaOH solution, and put it in an ultrasonic generator. The ultrasonic temperature is 35°C and 0.2W / cm 2Ultrasound at the power of 5 hours. Then it was transferred to a 50mL polytetrafluoroethylene lined autoclave and reacted hydrothermally at 125°C for 20 hours. The white product was separated from the excess alkali by centrifugation, and 0.1 mol / L of HNO was used. 3 Neutralize to pH 2-6, age, rinse with deionized water, exchange with absolute ethanol three times, and dry to obtain titanate nanotubes. Its molecular formula is H 2 Ti 3 O 7 ·H2O.

[0038] Repeat the above steps, the ultrasonic temperature is 85℃, and 0.2W / cm 2 The titanate nanotubes can be obtained by sonicating at a power of 2 hours.

[0039] Repeat the above steps, the ultrasonic temperature is 35℃, and 95W / cm 2 The titanate nanot...

Example Embodiment

[0047] Example 2

[0048] Weigh 1.0 g of industrially produced rutile crystal titanium dioxide powder, put it into a conical flask, add 40 ml of 10 mol / l NaOH solution, and put it into the ultrasonic generator at a rate of 0.2W / cm 2 The power of ultrasonic for 5 hours, the temperature is 85 ℃. Then it was transferred to a 50mL polytetrafluoroethylene-lined autoclave and reacted hydrothermally at 125°C for 30 hours. The white product was separated from the excess alkali by centrifugation, and 0.1 mol / L HNO was used. 3 After neutralizing to pH 2-6, aging for 8 hours, then rinsing with deionized water, then exchanging with absolute ethanol three times, and drying to obtain titanate nanotubes. Its molecular formula is H 2 Ti 3 O 7 ·H2O.

[0049] Repeat the above steps, the ultrasonic temperature is 85℃, and 0.2W / cm 2 The titanate nanotubes can be obtained by sonicating at a power of 3 hours.

[0050] Repeat the above steps, the ultrasonic temperature is 35℃, and 95W / cm 2 The titanate ...

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Abstract

The invention relates to a Ti oxide nano tube and preparing method. Its character: using TiO2 of various crystal shapes as raw material, and making ultrasonic processing, hydrothermal reaction and after treatment in NaOH solution to obtain titanic acid nano tube, and then baking to form TiO2 nano tube with anatase structure. The TiO2 nano tube has uniform appearance, small tube diameter and large specific surface area. It has wide applied prospect in the fields of photocatalysis, environmental purification, solar cell, gas and wet sensitive materials, etc. It has low energy consumption, simple device, and easy controlled condition, easy to realize large-scale industrial production.

Description

technical field [0001] The invention relates to a titanium oxide nanotube and a preparation method thereof, belonging to the technical field of nanomaterial preparation. Background technique [0002] In 1991, Japanese scientist Iijima discovered carbon nanotubes. Due to their special chemical, physical and mechanical properties, carbon nanotubes have attracted the attention of scientists from all over the world. Carbon nanotubes usually need to be produced at high temperature. Following carbon nanotubes, nanomaterials with one-dimensional structures such as nanotubes, nanowires, and nanorods have become research hotspots. [0003] TiO 2 It is an oxide semiconductor material with a wide range of uses, and has broad application prospects in photocatalysis, environmental purification, catalyst carriers, lithium-ion batteries, gas sensors, and solar cells. TiO 2 There are three crystal forms, namely anatase, rutile and brookite. Due to TiO 2 Wide range of applications, peopl...

Claims

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Application Information

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IPC IPC(8): C01G23/047
Inventor 张中太李俊荣唐子龙
Owner TSINGHUA UNIV
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