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Method for preparing nitrogen-doped titanium dioxide nanotube array

A technology of nanotube array and titanium dioxide, which is applied in the direction of coating, surface reaction electrolytic coating, electrolytic coating, etc., can solve the problem of low photocatalytic efficiency, achieve high heat utilization rate, mature process, and simple operation

Inactive Publication Date: 2010-12-22
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the existing problems of TiO2 nanotubes in the prior art: 1) Excessive band gap ( 3.2 eV) can only absorb ultraviolet light which accounts for only 4% of solar energy; 2) the recombination of photogenerated electrons and holes leads to very low photocatalytic efficiency

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  • Method for preparing nitrogen-doped titanium dioxide nanotube array
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  • Method for preparing nitrogen-doped titanium dioxide nanotube array

Examples

Experimental program
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Embodiment 1

[0038] Example 1: Industrial pure titanium is pretreated by grinding, polishing, ultrasonic cleaning and drying, etc., and then put it into the LD-70 ion nitriding furnace filled with dilute ammonia gas (the furnace chamber maintains negative pressure), With the inner wall of the furnace as the anode and the sample as the cathode, high voltage is applied to generate glow discharge, the nitriding temperature is 500 °C, and the nitriding time is 15 hours. After the ion nitriding process is completed, the sample is cooled to room temperature with the furnace, and then the sample is taken out; Measure 1.74 ml of hydrofluoric acid (40 vol.%), add ethylene glycol to 200 ml, and prepare 200 ml of HF / ethylene glycol anodic oxidation electrolyte; the nitrided metal titanium is used as the anode, and the graphite sheet is used as the anode. The cathode was anodized for 3 hours with an external DC voltage of 15 V, and then the obtained sample was calcined in air at 500 °C for 3 hours.

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Embodiment 2

[0040] Example 2: The titanium alloy is pretreated by grinding, polishing, ultrasonic cleaning and drying in sequence, and then it is put into an LD-70 ion nitriding furnace filled with dilute ammonia gas (the furnace chamber maintains negative pressure), so as to The inner wall of the furnace is the anode, and the sample is used as the cathode. High voltage is applied to generate glow discharge. The nitriding temperature is 700 °C, and the nitriding time is 20 hours. After the ion nitriding process is completed, the sample is cooled to room temperature with the furnace, and then the sample is taken out; Take 2.61 ml of hydrofluoric acid (40 vol.%), add ethylene glycol to 200 ml, and prepare 200 ml of HF / ethylene glycol anodic oxidation electrolyte; the nitrided metal titanium is used as the anode, and the graphite sheet is used as the cathode , applied a DC voltage of 30 V, anodized for 4 hours, and then the obtained samples were calcined in air at 400 °C for 6 hours.

[0041...

Embodiment 3

[0042] Example 3: Put commercially pure titanium (TA2) through pretreatments such as grinding, polishing, ultrasonic cleaning and drying in sequence, and then put it into an LD-70 ion nitriding furnace filled with dilute ammonia gas (the furnace chamber maintains negative pressure), with the inner wall of the furnace as the anode and the sample as the cathode, high voltage is applied to generate glow discharge, the nitriding temperature is 600 °C, and the nitriding time is 5 hours. After the ion nitriding process is completed, the sample is cooled to room temperature with the furnace, and then Take out the sample; measure 3.48 ml hydrofluoric acid (40 vol.%), add ethylene glycol to 200 ml, and prepare 200 ml HF / ethylene glycol anodic oxidation electrolyte; use the nitriding-treated titanium metal as the anode, The graphite sheet was used as the cathode, and a 25 V DC voltage was applied, anodized for 2 hours, and then the obtained sample was calcined in air at 600 °C for 4 hour...

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Abstract

The invention provides a method for preparing a nitrogen-doped titanium dioxide nanotube array and application. The method comprises the following steps of: performing nitriding on the surface of industrially pure titanium or titanium alloy by an ion nitriding technique; and then growing the nitrogen-doped titanium dioxide nanotube array on the nitrided surface of the titanium in situ by an anodizing technique. The nitrogen-doped titanium dioxide nanotube array is applied in the field of visible light catalytic degradation. Compared with an undoped titanium dioxide nanotube array, the nitrogen-doped titanium dioxide nanotube array has the advantages that: an ultraviolet visible diffuse reflectance spectrum generates obvious red shift, the forbidden band width is reduced from 3.22 eV to 2.89 eV, photon-generated carrier concentration is doubled approximately, and the organic pollutant degrading efficiency is increased by about 5 times.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic materials, and in particular relates to a method for "in-situ" preparation of non-metal-doped titania nanotubes arrays (titania nanotubes arrays, TNT for short) by means of surface chemical heat treatment combined with anodic oxidation method, especially by using iontophoresis Combining nitrogen technology with anodic oxidation technology to prepare nitrogen (N) doped titania nanotubes arrays (N-doped titania nanotubes arrays, N-TNT for short). Background technique [0002] Titanium dioxide (TiO 2 ) has broad application prospects in the fields of new energy, biomedicine, and photocatalysis due to its chemical inertness, good biocompatibility, strong antioxidant capacity, and ability to resist chemical corrosion and photocorrosion. With the in-depth development of nanotechnology, nanostructured TiO 2 Especially TiO with unique tubular structure 2 Nanotubes, because of their many novel pr...

Claims

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Application Information

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IPC IPC(8): C25D11/26
Inventor 潘春旭江旭东杨涵王永钱
Owner WUHAN UNIV
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