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Titanium dioxide nano tube and preparation method thereof

A titanium dioxide and nanotube technology, applied in the field of preparing nanomaterials, can solve the problems of reducing the redox potential of photogenerated electrons and holes, the limitation of industrial application, and the reduction of photocatalytic performance, and achieves a wide absorption wavelength range, excellent photocatalytic effect, Easy-to-use effects

Inactive Publication Date: 2015-04-22
ZHEJIANG SCI-TECH UNIV
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Problems solved by technology

[0004] Since the band gap of titanium dioxide is 3.12eV, it can only absorb ultraviolet light with a wavelength less than 387nm, which makes the utilization rate of sunlight energy only about 4%, resulting in low light conversion efficiency and greatly restricting industrial applications.
In order to expand the TiO 2 The photoresponse range of TiO 2 A large number of modification studies have been carried out, such as metal ion doping, noble metal deposition, semiconductor recombination, dye sensitization and non-metal ion doping, etc. Although these methods can make TiO 2 The photoresponse region produces a red shift, reducing the TiO 2 However, the reduction of the forbidden band width will reduce the redox potential of photogenerated electrons and holes, resulting in a decrease in photocatalytic performance.

Method used

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  • Titanium dioxide nano tube and preparation method thereof
  • Titanium dioxide nano tube and preparation method thereof
  • Titanium dioxide nano tube and preparation method thereof

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preparation example Construction

[0030] A preparation method of titanium dioxide nanotubes, it comprises the following steps:

[0031] 1) Solution configuration: the concentration of NaOH solution is 10mol / L, and the concentration of hydrochloric acid solution is 1moL / L;

[0032] 2) Hydrothermal reaction: Add a certain amount of commercially available titanium dioxide powder into high-concentration NaOH solution, mix ultrasonically for 15-25 minutes or magnetically stir for 2-3 hours to fully mix the two, and transfer the mixed solution to the reaction kettle. To the oven, hydrothermal reaction for a period of time;

[0033] The parts by weight of each component of the preparation method batching of described titanium dioxide nanotubes are:

[0034] NaOH solution: 95-98 parts

[0035] TiO2: 2-5 parts

[0036] Reaction temperature: 120-140°C

[0037] Response time: 32-36h

[0038] 3) Separation and washing of the intermediate: After the hydrothermal reaction in step 2), the reaction kettle is naturally co...

Embodiment 1

[0046] Embodiment 1: a kind of preparation method of titanium dioxide nanotube, it comprises the following steps:

[0047] 1) Solution configuration: the concentration of NaOH solution is 10mol / L, and the concentration of hydrochloric acid solution is 1moL / L;

[0048] 2) Hydrothermal reaction: Add 1 part of commercially available titanium dioxide powder to 95 parts of high-concentration NaOH solution in parts by mass, mix ultrasonically for 15 minutes to fully mix the two, transfer the mixed solution to the reaction kettle and move it to the oven , hydrothermal reaction at a high temperature of 120°C for 32 hours;

[0049] 3) Separation and washing of intermediates: After the hydrothermal reaction in step 2), the reaction kettle is naturally cooled to normal temperature, the intermediates are taken out, acidified with a prepared 1mol / L hydrochloric acid solution, and the pH is kept at 1.5, and the magnetic Stir with a stirrer for 24 hours, seal it with a plastic wrap, then pe...

Embodiment 2

[0052] Embodiment 2: a kind of preparation method of titanium dioxide nanotube, it comprises the following steps:

[0053] 1) Solution configuration: the concentration of NaOH solution is 10mol / L, and the concentration of hydrochloric acid solution is 1moL / L;

[0054]2) Hydrothermal reaction: Add 3 parts of commercially available titanium dioxide powder into 97 parts of high-concentration NaOH solution, stir magnetically for 3 hours to fully mix the two, transfer the mixed solution to the reaction kettle and move it to an oven, and heat it at a high temperature of 140 Hydrothermal reaction at ℃ for 34 hours;

[0055] 3) Separation and washing of intermediates: After the hydrothermal reaction in step 2), the reaction kettle is naturally cooled to normal temperature, the intermediates are taken out, acidified with a prepared 1mol / L hydrochloric acid solution, and the pH is kept at 1.5, and the magnetic Stir with a stirrer for 24 hours, seal it with a plastic wrap, then perform ...

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Abstract

The invention relates to a titanium dioxide nano tube and a preparation method thereof. Commercially available titanium dioxide is adopted as a raw material, high-concentration sodium hydroxide is used as a raw material, the raw materials are processed at a high temperature for a period of time to obtain a sodium titanate midbody, then the midbody is separated from a high-concentration sodium hydroxide solution, the block-shaped midbody is slightly crushed and stirred and washed by acid solution, the midbody is converted to the form of titanic acid, and the titanic acid is heated to obtain the titanium dioxide nano tube. By adopting the method, the efficiency is high, the yield is high, the high temperature roasting is not needed, the alkaline liquid and acid liquid can be recycled, the high-efficient utilization of the resource can be realized, the low-carbon environment-friendly ecological concept can be satisfied, the prepared nano tube is excellent in performance, wider in absorption wavelength range, excellent in photo catalytic effect and capable of being widely used such as photo catalyst, lithium battery and the like.

Description

technical field [0001] The invention relates to a method for preparing nanomaterials, in particular a method for preparing titanium dioxide nanotubes. Background of the invention [0002] Energy shortages, environmental pollution and a large amount of CO 2 The greenhouse effect caused by emissions has become the most important problem facing the development of the world today. The development of new energy and renewable energy and the control of CO 2 Emissions and realization of CO 2 The utilization of resources and the mitigation of the greenhouse effect have become the consensus of all sectors of society. Nanomaterials have a large specific surface area, as well as special pore volume and surface area, so their physical and chemical properties are special, and they have attractive application prospects in the fields of photocatalysis and lithium batteries. Titanium dioxide nanotubes have a wider absorption range for waves than micron-sized titanium dioxide, which is ben...

Claims

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Application Information

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IPC IPC(8): B01J21/06B82Y40/00B82Y30/00
Inventor 魏猛杨子昂万军民彭志勤王秉胡智文
Owner ZHEJIANG SCI-TECH UNIV
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