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Synthesis technology for visible light titanium dioxide nanosheet with exposed {001} face and oxygen defects

A technology of titanium dioxide and synthesis process, applied in the direction of titanium dioxide, titanium oxide/hydroxide, nanotechnology, etc., can solve the problems of high electron-hole recombination rate, low sunlight utilization rate, low quantum efficiency, etc., and achieve simple preparation process , Obvious single crystal diffraction, particle uniform effect

Inactive Publication Date: 2012-09-12
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At the same time, due to the anatase phase of TiO 2 The band gap is wide (~3.2eV), the light absorption wavelength is mainly limited to the ultraviolet region, and the utilization rate of sunlight is low (about 5%); the electron-hole recombination rate is relatively high, and the quantum efficiency is low, which limits Nano TiO 2 Application of materials in photocatalysis

Method used

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  • Synthesis technology for visible light titanium dioxide nanosheet with exposed {001} face and oxygen defects
  • Synthesis technology for visible light titanium dioxide nanosheet with exposed {001} face and oxygen defects
  • Synthesis technology for visible light titanium dioxide nanosheet with exposed {001} face and oxygen defects

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Embodiment 1

[0025] Dissolve butyl titanate and titanium tetrafluoride with a molar ratio of 1:2 in a mixed solution of 1.25mL 20% nitric acid aqueous solution and 25mL ethanol to obtain solution A. The molar volume ratio of Ti element to the solution is 3:26.25. The solution was aged at 40°C for 2 days to form a gel, and then placed in a supercritical reactor filled with 250mL of ethanol, aged at 260°C for 2h for extraction, and finally the samples were collected directly after the extraction cooled down. attached figure 1 The FESEM spectrum of the morphology of visible-light titania nanosheets with oxygen defects exposed on the {001} surface obtained in this case is given. It can be seen from the figure that the sample is a single crystal nanosheet. attached figure 2 The TEM image of visible titanium dioxide nanosheets with oxygen defects exposed on the {001} surface obtained in this case is given. The size is about 200nm and the thickness is about 10nm. The electron diffraction of the...

Embodiment 2

[0027] Repeat the operation steps of Example 1, the difference is that in the supercritical reactor, aging at 270 ° C for 2h extraction, the result is similar to Example 1, but the nanosheets become larger and thinner. The microstructure of the sample is consistent with that of Example 1, the crystallinity is consistent with that of Example 1, and the diffuse reflectance results show that the sample has a visible light response.

Embodiment 3

[0029] Repeat the operation steps of Example 1, the difference is that in the supercritical reactor, aging at 280 ° C for 2h extraction, the result is similar to Example 1, but the nanosheets become relatively larger and thinner. . The microstructure of the sample is consistent with that of Example 1, the crystallinity is consistent with that of Example 1, and the diffuse reflectance results show that the sample has a visible light response.

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Abstract

The invention discloses a synthesis technology for a visible light titanium dioxide nanosheet with an exposed {001} face and oxygen defects. The synthesis technology comprises the following steps of: 1-, dissolving a precursor of titanium in a solvent A to obtain a solution B; 2-, ageing the solution B at the temperature of 40 DEG C for two days; and 3-, treating a product after ageing is ended through the supercritical extraction technique to obtain the visible light titanium dioxide nanosheet with the exposed {001} face and the oxygen defects. The synthesis technology for the visible light titanium dioxide nanosheet with the exposed {001} face and the oxygen defects has the advantages that 1-, the preparation process is simple and convenient; the reaction condition is strong in controllability; the synthesis time is short; other compound semiconductors or corresponding elements doped with visible light do not need to be introduced in the synthetic process; and retreatment is not needed after the reaction is ended; 2-, a prepared catalyst is very good in crystalline and has obvious single crystal diffraction. The synthesis technology for the visible light titanium dioxide nanosheet with the exposed {001} face and the oxygen defects has a potential application value in the aspects of environmental control, producing hydrogen by water photolysis, dye sensitized solar cells, photoelectric materials and the like.

Description

technical field [0001] The invention relates to a preparation method of titanium dioxide nanosheets, in particular to a synthesis process of visible light titanium dioxide nanosheets with exposed {001} planes and oxygen defects. Background technique [0002] TiO 2 is an important semiconductor photocatalyst, TiO 2 Because of its green, non-toxic, high catalytic activity, good chemical stability, cheap and easy to obtain, it has become a typical photocatalyst. The photocatalytic performance of titanium dioxide mainly depends on the crystal phase, crystallinity, specific surface area, structure and exposed crystal facets. Studies have shown that the average surface energy of each crystal face of anatase titanium dioxide crystal is: 0.90J m -2 {001}>0.53J·m -2 {100}>0.44J·m -2 {101}. Therefore, in anatase titanium dioxide crystals, the reactivity of {001} high-energy crystal planes is higher than that of {101} crystal planes, but currently synthesized titanium dioxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B82Y40/00
CPCY02P20/54
Inventor 李贵生张鹏张蝶青李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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