Preparation method for TiO2 nanotube array film with high catalytic properties and application of TiO2 nanotube array film

A nanotube array and thin film technology, applied in the field of photocatalysis, can solve the problems of slow photocatalytic reaction rate, unsatisfactory catalytic performance, low utilization rate of sunlight, etc., and achieve optimized anatase crystallinity, high commercial value, catalytic Excellent efficiency

Inactive Publication Date: 2014-09-03
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] Although TiO 2 It has many advantages in photocatalytic performance, and has been developed rapidly in recent years, but so far, TiO 2 There are still the following problems in the application of photocatalytic materials: (1) TiO 2 The photocatalytic quantum yield is low, generally only about 4%, so the photocatalytic reaction rate is slow; (2) Due to its wide band gap, it can only absorb and utilize ultraviolet light, making its utilization rate of sunlight low; (3) Conventional TiO 2 In the practical application of photocatalysts, it is difficult to maintain high photocatalytic activity and meet the physical performance requirements in specific environments, etc.
For example, the researchers prepared TiO by the anodic oxidation method 2 Nanotube array films try to improve the photocatalytic performance by greatly increasing the specific surface area, but from the perspective of practical application, its catalytic performance is still not ideal and needs to be further improved

Method used

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  • Preparation method for TiO2 nanotube array film with high catalytic properties and application of TiO2 nanotube array film
  • Preparation method for TiO2 nanotube array film with high catalytic properties and application of TiO2 nanotube array film
  • Preparation method for TiO2 nanotube array film with high catalytic properties and application of TiO2 nanotube array film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Place the metal Ti sheet in acetone, ethanol and deionized water in sequence, wash it for 10 minutes respectively, and dry it with high-pressure nitrogen as the anode;

[0040] (2) Metal Mo is used as the cathode. Using an ethylene glycol solution of 0.09mol / L ammonium fluoride and 1.8wt.% deionized water as the electrolyte, pass a 60V DC voltage between the two electrodes and keep it for 1 hour to obtain amorphous TiO 2 nanotube array films (such as figure 1 shown);

[0041] (3) TiO 2 The thin film is placed in a crucible, in pure N 2 Annealing is performed in a mixed gas atmosphere of gas and water vapor. The temperature rise rate of the annealing furnace is set at 10°C / min, and the temperature is raised to 200°C for 0.5 hours, and the gas flow rate is in the range of 0.4 liters / min.

Embodiment 2

[0043] Preparation of TiO by anodic oxidation 2 The implementation steps of the nanotube array thin film are the same as (1) (2) of Example 1.

[0044] The heating rate of the annealing furnace is set at 10°C / min, and the pure N 2 Under the atmosphere, the temperature was raised to 200 ° C and kept for 0.5 hours, and the TiO was annealed according to the step (3) of Example 1. 2 Nanotube Array Films. Gained sample utilizes XRD to test its degree of crystallization, the result is as follows figure 2 Shown in the b curve.

[0045] The temperature rise rate of the annealing furnace is set at 10°C / min, and the pure N in the annealing atmosphere 2 Mixed with water vapor, the temperature was raised to 200 ° C and kept for 0.5 hours, according to the step (3) of Example 1 to anneal TiO 2 Nanotube Array Films. Gained sample utilizes XRD to test its degree of crystallization, the result is as follows figure 2 The middle c curve is shown.

[0046] XRD shows that at 200 °C, the...

Embodiment 3

[0049] Preparation of TiO by anodic oxidation 2 The implementation steps of the nanotube array are the same as (1) (2) of Embodiment 1.

[0050] The same as embodiment 2 for the annealing treatment step of sample, obtain sample and utilize XRD to test its degree of crystallization, the result is as follows figure 2 In b, c curve shown.

[0051] Compare the photocatalytic efficiency of two kinds of samples, take Rhodamine b as the target degradation dye, the experimental procedure is the same as that described in Example 2, pure N 2 The degradation results of atmosphere annealed samples are as follows: Figure 4 As shown in the b curve, the degradation results of the samples mixed with water vapor annealing are as follows Figure 4 The middle c curve is shown. where pure N 2 The degradation efficiency of rhodamine b within 1 hour of atmosphere annealed sample was 21.58%, and the degradation efficiency of sample mixed with water vapor annealed was 31.19%, and the latter wa...

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Abstract

The invention belongs to the technical field of photocatalysis and particularly relates to a preparation method for a TiO2 nanotube array film with high catalytic properties and application of the TiO2 nanotube array film. The preparation method comprises the following steps of: firstly, cleaning the surface of a Ti sheet and preparing the TiO2 nanotube array film by using an anodic oxidation method; secondly, feeding the TiO2 nanotube array film in an alumina crucible; thirdly, feeding the alumina crucible into a tubular furnace and introducing proper atmosphere; meanwhile, doping water vapor in the atmosphere to obtain mixed gas and carrying out heat treatment; and cooling and then taking out the alumina crucible to obtain the TiO2 nanotube array film. The preparation method disclosed by the invention is simple in process and low in preparation temperature; the obtained TiO2 nanotube array film has better anatase crystallinity and higher photocatalytic degradation capability compared with a sample subjected to pure gas atmosphere annealing; and a novel prospect for the application of the TiO2 nanotube array film is opened up.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis. Specifically related to a TiO 2 Preparation method of nanotube and its application in the field of photocatalysis. Background technique [0002] TiO 2 As a transition metal oxide, it has been widely used in photocatalysis, dye-sensitized solar cells and some biotechnology fields due to its superior structural characteristics, and has gradually become the focus of recent research at home and abroad. Research in the field of semiconductor photocatalysis has shown that TiO 2 It has a series of special excellent properties, such as good physical and chemical stability, no photocorrosion after exposure to light, good acid and alkali resistance, and no toxicity to organisms; abundant sources and low cost; large energy gap, generating photogenerated electrons and space The potential of the hole is high, and it has strong oxidizing and reducing properties. In terms of environmental protection...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/26B01J21/06C02F1/32
CPCY02W10/37
Inventor 李梦琳王娇黄高山刘照乾梅永丰
Owner FUDAN UNIV
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