Preparation method and application of TiO2 nanotube coated with amorphous layer

A nanotube, amorphous technology, applied in chemical instruments and methods, physical/chemical process catalysts, titanium dioxide, etc., can solve the problems of low utilization efficiency, low mineralization rate, slow degradation rate, etc., to improve absorption performance, high Mineralization rate, simple effect of raw materials

Inactive Publication Date: 2014-10-15
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The photosensitization mechanism overcomes the problem of low utilization efficiency of sunlight by titanium dioxide as a photocatalyst, but the photosensitization catalysts currently reported generally have a slow degradation rate, especially a very low mineralization rate, and cannot further reduce organic pollutants to small molecules. Fragments are oxidized to harmless carbon dioxide gas

Method used

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  • Preparation method and application of TiO2 nanotube coated with amorphous layer
  • Preparation method and application of TiO2 nanotube coated with amorphous layer
  • Preparation method and application of TiO2 nanotube coated with amorphous layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Disperse 2g of titanium oxide powder (Degussa P25) in 40mL of 10mol / L sodium hydroxide aqueous solution, transfer the solution to a hydrothermal kettle, heat to 150°C, and keep the temperature constant for 24 hours. When the temperature of the reaction kettle drops to room temperature, pour Remove the upper clear layer, transfer the white solid substance at the bottom to a beaker, ultrasonically disperse, and wash with deionized water several times to remove excess sodium hydroxide. The obtained white solid was dispersed into 40 mL of 0.05 mol / L nitric acid solution, and after aging for 6 hours, the white solid was separated by centrifugation. After repeating the above acid exchange process twice, wash with deionized water several times, centrifuge until the pH value of the washing solution reaches neutral, and dry in vacuum at 60°C to obtain titanate nanotube samples.

Embodiment 2

[0045] The titanate nanotube sample obtained in Example 1 was put into a muffle furnace, and the temperature was raised to 350° C. under an air atmosphere, and kept at a constant temperature for 4 hours to obtain a titanium dioxide nanotube sample coated with an amorphous layer.

[0046] The transmission electron microscope picture of the titanium dioxide nanotube sample is as follows figure 2 As shown, in the high-resolution transmission electron microscope image (b), it can be seen that the main body of the titanium dioxide nanotube sample is an anatase phase with a one-dimensional tubular structure, and the surface layer is amorphous titanium dioxide.

[0047] The titanate nanotubes prepared in Example 1, and the XRD patterns of the titanium dioxide nanotubes after annealing at different treatment temperatures for 4 hours are as follows image 3 As shown, it can be seen that with the increase of annealing temperature, the content of titanium dioxide in the anatase phase gr...

Embodiment 3

[0049] 30 mg of the titanium dioxide sample prepared in Example 2 was ultrasonically dispersed in 100 mL of 10 mg / L rhodamine B aqueous solution, and after stirring for 30 minutes in a dark place, visible light photosensitized degradation of rhodamine B was achieved under the irradiation of a 300W Xe lamp. The ultraviolet component in is filtered out by cut-off filter (exit light wavelength>420nm). Samples were taken at different time intervals, the titanium oxide nanotubes were removed by centrifugation, and the absorption spectrum of the supernatant was measured to obtain Figure 4 The change process shown, while measuring the total carbon content (TOC) in the solution to get Figure 5 .

[0050] from Figure 4 It can be seen that the photosensitized degradation process of rhodamine B is completed in about 1 hour. With commercial P25 particles (Degussa, Degussa) as a contrast, using Rhodamine B as a substitute for organic pollutants, under the same conditions, the photose...

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Abstract

The invention discloses a preparation method and application of a TiO2 nanotube coated with an amorphous layer. According to the preparation method, titanium oxide powder is firstly adopted and subjected to hydrothermal reaction in a sodium hydroxide solution to obtain a sodium titanate nanotube; the sodium titanate nanotube is washed and subjected to acid exchange to obtain a titanic acid nanotube; lastly, the titanic acid nanotube is subjected to annealing at a proper temperature to obtain the titanium dioxide coated with the amorphous layer. The main body of the titanium dioxide nanotube is an anatase phase and adopts a one-dimensional tubular structure; a part of amorphous titanium dioxide remains on the surface of main body of the titanium dioxide nanotube. As the amorphous titanium dioxide layer is adopted, the specific surface area of the material is higher and the surface functional groups are rich; moreover, the material has certain light absorbing characteristics in a visible light region and the TiO2 nanotube can be applied in the field of water treatment, sensing, dye stuff/ quantum dot sensitization solar batteries.

Description

technical field [0001] The invention relates to a method for preparing amorphous layer-coated TiO 2 Methods of nanotubes and their use in water treatment, photocatalysis, Li-ion batteries, sensing, dye / quantum dot sensitized solar cells. Background technique [0002] Titanium dioxide nanomaterials have a wide range of application values ​​in photocatalysis, water treatment, lithium-ion batteries, sensing, dye / quantum dot sensitized solar cells and other fields. The controlled synthesis technology of titanium dioxide materials is a research hotspot in the field of materials. [0003] The use of titanium dioxide nanomaterials to achieve photocatalytic degradation of organic pollutants has attracted much attention in the environmental field. However, because titanium dioxide is a wide-bandgap semiconductor, only part of the ultraviolet light can be used for photocatalytic degradation, and sunlight is the main component. Visible light cannot be effectively utilized because it c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053C02F1/30B01J21/06
Inventor 徐东升李建明李琦
Owner PEKING UNIV
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