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Low-concentration copper-doped titanium dioxide nanotube photocatalyst and preparation method thereof

A technology of titanium dioxide and photocatalyst, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, chemical instrument and method, etc. It can solve the problems of low stability of doping metal doping, complicated process, and unfavorable large-scale production. , to achieve a clear effect

Inactive Publication Date: 2011-11-16
NANKAI UNIV
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AI Technical Summary

Problems solved by technology

Although there are many methods of doping metal ions, such as sol-gel method, photoreduction deposition method, impregnation method, etc., the preparation of metal doping by sol-gel method is the most widely studied, but the method is complicated and not conducive to large-scale Production, while the doping stability of impregnation doped metals is not high

Method used

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  • Low-concentration copper-doped titanium dioxide nanotube photocatalyst and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0010] The preparation of example 1 pure titania nanotube catalyst

[0011] (1) First cut the titanium plate and the nickel plate into several rectangles with equal area of ​​4cm×10cm. Then the cut titanium sheet and nickel sheet were polished with metallographic sandpaper until there were no scratches on the surface, and the oxide layer on the surface of the titanium sheet was removed, followed by ultrasonic cleaning in distilled water, acetone, and distilled water for 25 minutes, and finally placed in air to dry .

[0012] (2) Select 0.5wt% NH 4 F+0.3M(NH 4 ) 2 SO 4 +glycerin+water (volume ratio 2:1) is the electrolyte, using a DC stabilized power supply, the titanium sheet is used as the anode, the nickel sheet is used as the cathode, the voltage is 30V, the anodic oxidation time is 2h, and a magnetic stirrer is used for stirring, room temperature ( 25°C) for anodic oxidation.

[0013] (3) After the reaction, wash the sample with distilled water and dry it in the air....

example 2

[0014] The preparation of example 2 copper-doped titania nanotubes

[0015] (1) Doping pretreatment, pure TiO prepared by anodic oxidation 2 Nanotubes should be soaked in acetone for 5 minutes before doping, and washed with distilled water to remove reducing substances on the nanotubes.

[0016] (2) Using a DC regulated power supply with a range of 0-30V to prepare amorphous pure TiO 2 The nanotube is the cathode, the nickel sheet is the anode, 0.01M copper sulfate is selected as the electrolyte, the voltage is 0.5V, the electrochemical deposition time is 1h, the magnetic stirrer is used for stirring, and the electrodeposition reaction is carried out at room temperature (25°C).

[0017] (3) Prepared copper-doped TiO 2 The nanotubes were rinsed with distilled water and left to air dry.

[0018] (4) Put the prepared copper-doped titanium dioxide nanotubes into a tubular resistance furnace for calcination in air for 2 h, the calcination temperature is 500 °C, 600 °C, 700 °C, a...

example 3

[0019] Example 3 Application example of low concentration copper-doped titanium dioxide nanotube photocatalytic degradation of methyl orange

[0020] Using the prepared low-concentration copper-doped titanium dioxide nanotubes to carry out the experiment of ultraviolet photocatalytic degradation of methyl orange, the concentration of methyl orange is 20mg L -1 , with a 400W high-pressure mercury lamp as the ultraviolet light source, the degradation rate of methyl orange was 89.9% after irradiating for 60 minutes, and the catalyst still had a high degradation rate after repeated use.

[0021] Using the prepared low-concentration copper-doped titanium dioxide nanotubes to carry out the solar photocatalytic degradation experiment of methyl orange, the concentration of methyl orange is 5mg L -1 , select sunlight (Nanjing, China, mid-August, direct sunlight during 12:00-14:00) as the light source, after 120 minutes of sunlight irradiation, the methyl orange degradation rate of copp...

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Abstract

The invention relates to the field of titanium dioxide photocatalysis, in particular to researches in application of a titanium dioxide nanotube modified through metal doping to the field of photocatalysis. The invention provides a simple and feasible preparation method of a copper-doped TiO2 nanotube catalyst. According to the preparation method provided by the invention, low-concentration copper is effectively doped into a titanium dioxide nanotube array through adoption of a constant-voltage electrodeposition method; and the copper inside the titanium dioxide nanotube exists in the form of copper oxide; the copper-doped TiO2 nanotube catalyst has a good photocatalytic activity under ultraviolet light and sunlight; and the composition of electron hole pairs contained in titanium dioxide is effectively inhibited through copper doping, and therefore the photocatalytic property of the titanium dioxide nanotube is enhanced. The preparation method of the photocatalyst is a constant-voltage electrochemical deposition method, in which copper sulfate is taken as electrolyte, and a preparation process is simple; and in addition, the prepared copperdoped TiO2 nanotube catalyst has a stable property and can be used repeatedly.

Description

technical field [0001] The invention relates to the field of nano-titanium dioxide photocatalysis, in particular to the field of preparation and application of metal copper-doped modified titanium dioxide nanotube photocatalyst. The catalyst prepared by the method is especially suitable for catalyzing the degradation of methyl orange under the irradiation of ultraviolet light and sunlight, and achieves a higher degradation rate. Background technique [0002] Photocatalytic oxidation technology belongs to a new type of advanced oxidation technology. It is developed for the characteristics of high concentration, high toxicity and poor biodegradability of organic wastewater pollutants. Research and development of new photocatalytic oxidation materials to treat difficult biochemical organics has become a water treatment One of the most important research topics in the field of technical research. Among various photocatalytic materials, TiO 2 The material has the advantages of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72B01J37/34C02F1/32
CPCY02W10/37
Inventor 肖羽堂何志坚王瑶李志花许双双
Owner NANKAI UNIV
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