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Preparation method of carbon doped nano titanium dioxide thin film with visible light activity and use thereof

A nano-titanium dioxide and visible light technology, which is applied in nanostructure manufacturing, chemical instruments and methods, nanotechnology, etc., can solve the problems of expensive equipment, high energy consumption of sputtering coating, and difficult control of the method, and achieve the effect of simple equipment

Inactive Publication Date: 2009-07-29
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Carbon-doped nano-TiO has been reported 2 There are many ways to prepare thin films. Khan et al. prepared carbon-containing TiO with visible light response by heating Ti metal with gas flame. 2 The thin film improves the absorption performance of visible light, and a wider absorption platform of visible light band appears. The problem is that Khan's method is difficult to control; it is also reported that the use of CO 2 Preparation of Carbon-containing TiO by Sputtering Metallic Ti Target as Reactive Gas 2 thin films, we have also reported the method of sputtering Ti / C mixed target to prepare carbon-containing TiO 2 films, and anodized TiC films sputtered to obtain TiO 2-x C x Thin film and other methods
However, these methods have some disadvantages, such as high energy consumption of sputtering coating, expensive equipment, etc.

Method used

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  • Preparation method of carbon doped nano titanium dioxide thin film with visible light activity and use thereof
  • Preparation method of carbon doped nano titanium dioxide thin film with visible light activity and use thereof
  • Preparation method of carbon doped nano titanium dioxide thin film with visible light activity and use thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Prepare a TiC thin film on the surface of the Ti sheet by electrophoretic deposition at room temperature, fix the cleaned Ti sheet in the electrolytic cell, adjust the potential of the potentiostat to 10.0V, and use a titanium carbide suspension containing 10g / L as the electrophoretic deposition solution. Electrophoretic deposition for 2 hours, the current time change curve of the electrophoretic deposition process is as follows figure 2 Shown in the curve a. The obtained TiC film was heat-treated at 350 °C for 2 hours in an air atmosphere, at which time the TiC film transformed into carbon-containing TiO 2 film. image 3 Shows the carbon-containing TiO obtained by electrophoretic deposition of TiC film in this example after heat treatment 2 The photocurrent of the film, it can be seen that the stable short-circuit photocurrent under visible light is 0.23μA / cm 2 .

Embodiment 2

[0034] Prepare a TiC thin film on the Ti surface by electrophoretic deposition method at room temperature, fix the cleaned Ti sheet in the electrolytic cell, use a metal Pt sheet as the counter electrode, adjust the DC stabilized power supply voltage to 30V, and the distance between the electrodes to 1cm, electrophoretic deposition The solution is titanium carbide suspension containing 40g / L, electrophoretic deposition for 8 hours to obtain a TiC film, and the obtained TiC film is heat-treated at 450°C for 2 hours in an air atmosphere, and the TiC film is transformed into carbon-containing TiO 2 film. The XRD pattern of the obtained TiC thin film is as follows Figure 4 Shown in the b curve. The diffraction peak of titanium carbide can be clearly seen from the figure, indicating that titanium carbide has been successfully deposited on the surface of the substrate; at the same time Figure 4 The curve in middle c shows the XRD spectrum of titanium carbide powder after heat tr...

Embodiment 3

[0036] Prepare a TiC thin film on the surface of the Ti sheet by electrophoretic deposition at room temperature, fix the cleaned Ti sheet in the electrolytic cell, adjust the voltage to 13.5V, and use a titanium carbide suspension containing 10g / L as the electrophoretic deposition solution for 2 hours of electrophoretic deposition , the current-time variation curve of the electrophoretic deposition process is as follows figure 2 Shown in the b curve. The obtained TiC film was heat-treated at 350 °C for 2 hours in an air atmosphere, at which time TiC transformed into carbon-containing TiO 2 film. Figure 5 Shows the carbon-containing TiO obtained by electrophoretic deposition of TiC film in this example after heat treatment 2 The photocurrent of the film, it can be seen that the photocurrent under visible light is 0.68μA / cm 2 . Figure 6 Shown is the carbon-containing TiO prepared in this example 2 Photocurrent-potential curves of the film in different states, it can be s...

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Abstract

The invention discloses a method for preparing a carbon-doped nano titanium dioxide film with visible light activity, and application thereof. The preparation method comprises the following steps: using titanium carbide nano powder as a raw material, a direct-current regulated power supply or a constant potential rectifier as an input device and a suspension of nano titanium carbide as an electrophoresis depositing liquid, electromagnetically stirring the mixture during electrifying, and depositing titanium carbide nano granules on the surface of a substrate to form a TiC film; and thermally treating the formed TiC film by a muffle furnace to form the carbon-containing TiO2 film with the visible light activity when the color of the TiC film changes, wherein the input voltage during electrophoresis depositing is between 10 and 30 volts, and the electrophoresis time is between 0.5 and 10 hours; the electrophoresis depositing liquid adopts the suspension containing 10 to 40 grams per liter of nano titanium carbide; and the thermal treatment temperature is between 350 and 450 DEG C, and the oxidizing time is between 0.5 and 6 hours. Electrophoresis depositing equipment adopted by the method is simple, and the electrophoresis depositing solution can be used repeatedly, so the method can achieve energy conservation and emission reduction during production.

Description

technical field [0001] The invention relates to the technical field of titanium dioxide photocatalytic chemical industry, in particular to a method for preparing a carbon-doped nano-titanium dioxide thin film with visible light activity by electrophoretic deposition technology. Background technique [0002] Since the discovery in 1972 that the semiconductor titanium dioxide electrode splits water into hydrogen and oxygen under ultraviolet light, titanium dioxide has received extensive attention in the field of materials. TiO 2 It can be used in many aspects such as photocatalytic degradation of organic matter, sterilization and disinfection, sewage treatment, air purification, photolysis of water and hydrogen production. 2 The bandgap width is relatively large (3.2eV anatase type, 3.0eV rutile type), and the absorption of visible light is poor, which greatly limits its application range. At present, visible light active nano-TiO 2 The research on the preparation method ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J21/18B82B3/00C01B3/04H01M4/96
CPCY02E60/50Y02E60/364Y02E60/36
Inventor 崔晓莉朱蕾张晓艳顾君嗣
Owner FUDAN UNIV
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