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Hydrotreated TiO2 nanotube array and preparation method thereof

A nanotube array, hydrogen technology, applied in the field of nanomaterials, can solve the problems of limitation, insufficient utilization of visible light and infrared light, poor electrical conductivity of nanomaterials, etc., achieving simple preparation process, excellent ability to utilize visible light and infrared light, and obvious advantages. The effect of electrical conductivity

Active Publication Date: 2012-12-26
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For now, nitrogen-doped TiO 2 Nanomaterials exhibit maximum visible light responsiveness, but their ability to utilize visible and infrared light is significantly insufficient
In addition, TiO obtained without heat treatment or heat treatment by traditional techniques 2 The poor electrical conductivity of nanomaterials limits the TiO 2 Application of Nanomaterials in the Field of Electrochemistry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Machining a metal sheet with a thickness of 300 μm into an area of ​​20 cm 2 square sheet, then polish the processed metal sheet with silicon carbide sandpaper, then clean it with acetone and ethanol in turn, and dry it for use; the metal sheet is a titanium sheet;

[0023] (2) Place the metal sheet dried in step (1) as an anode in the electrolytic cell, and electrolytically oxidize it for 72 hours at a voltage of 70V and a temperature of 30°C, and then place the electrolytically oxidized metal sheet in Ultrasonic oscillation in absolute ethanol to obtain TiO separated from the matrix 2 Nanotube array; the electrolytic oxidation electrolyte contains 0.28% by mass of ammonium fluoride, and the balance is a mixed solvent, wherein the mixed solvent is formed by mixing ethylene glycol and deionized water at a volume ratio of 49:1;

[0024] (3) TiO described in step (2) 2 The nanotube array was heat-treated for 50 hours under the protection of hydrogen atmosphere at a ...

Embodiment 2

[0027] The preparation method of this embodiment is the same as that of Example 1, except that the metal sheet used is a binary titanium alloy sheet, a ternary titanium alloy sheet or a quaternary titanium alloy sheet, wherein the binary titanium alloy sheet is a TiNb alloy sheet, TiTa alloy sheet, TiZr alloy sheet, TiFe alloy sheet, TiV alloy sheet or TiAl alloy sheet, ternary titanium alloy sheet is a ternary titanium alloy sheet composed of Ti and two of Nb, Ta, Zr, Fe, Al and V The quaternary titanium alloy sheet is a quaternary titanium alloy sheet composed of Ti and three of Nb, Ta, Zr, Fe, Al and V.

[0028] The TiO of the hydrogenation treatment that present embodiment prepares 2 The nanotube array has an excellent ability to utilize visible light and infrared light, and its ability to photocatalyze the degradation of the same organic pollutants is comparable to that of untreated TiO 2 Compared with the nanotube array, there is a greater improvement, and the hydrogena...

Embodiment 3

[0030] (1) Machining a metal sheet with a thickness of 100 μm into an area of ​​1 cm 2 Then the processed metal sheet is polished with silicon carbide sandpaper, then cleaned with acetone and ethanol in turn, and dried for use; the metal sheet is a TiTa alloy sheet, and the mass percentage of Ti in the alloy sheet is The content is 80%;

[0031](2) Place the metal sheet dried in step (1) as an anode in the electrolytic cell, and electrolytically oxidize it for 7 hours at a voltage of 20V and a temperature of 70°C, and then place the electrolytically oxidized metal sheet in Ultrasonic oscillation in absolute ethanol to obtain TiO separated from the matrix 2 Nanotube array; the electrolytic oxidation electrolyte contains 0.32% by mass of ammonium fluoride, and the balance is a mixed solvent, wherein the mixed solvent is formed by mixing ethylene glycol and deionized water at a volume ratio of 49:1;

[0032] (3) TiO described in step (2) 2 The nanotube array was heat-treated f...

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Abstract

The invention discloses a hydrotreated TiO2 nanotube array. Ti<n+> contained in the hydrotreated TiO2 nanotube array accounts for 1-3 percent of the total number of titanium ions, wherein n is a positive integer which is not more than 3; the color of the hydrotreated TiO2 nanotube array is black or greenblack, and the conductivity is 0.01S.cm<-1>-8.9S.cm<-1>. The invention also discloses a preparation method of the hydrotreatedTiO2 nanotube array, comprising the following steps of: preparing the TiO2 nanotube array by adopting electrolytic oxidation; and then carrying out hydrotreating heat treatment on the prepared TiO2 nanotube array to obtain the hydrotreated TiO2 nanotube array. The hydrotreated TiO2 nanotube array disclosed by the invention has excellent capability in using visible light and infrared light, is obviously enhanced in electrical conductivity and is better enhanced in capability in photocatalytic degradation of homogenic organic pollutants compared with that of a non-hydrogenated TiO2 nanotube array.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, in particular to a hydrogenated TiO 2 Nanotube arrays and methods of making them. Background technique [0002] The ability of semiconductors to use sunlight and infrared light to photolyze water to produce hydrogen and decompose pollutants in water has attracted the attention of many countries. However, the application of semiconductors in the field of photocatalysis is limited due to the fast recombination rate of photogenerated electrons and holes. TiO 2 Nano powder, especially TiO 2 Due to the huge specific surface area, the nanotube array can promote the rapid progress of the surface reaction, so it is widely used as a semiconductor catalyst in the field of clean energy and the environment based on the utilization of solar energy. Currently in order to increase the TiO 2 Nanomaterials use solar energy, especially the efficiency of visible light, and many scholars have carried out r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/20B01J21/06B01J23/745B01J23/22B01J23/847C01B3/04C02F1/30C02F101/38
CPCY02E60/364Y02E60/36
Inventor 李广忠汤慧萍张文彦康新婷李纲
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH