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Synthesis technique of {001}-surface-exposed visible light titanium dioxide nanosheet with oxygen vacancy

A technology of titanium dioxide and synthesis process, which is applied in the field of synthesis process of visible light titanium dioxide nanosheets, which can solve the problems of limiting the application of photocatalysts and complicated processes, and achieve the effects of simple preparation process, good crystallinity, and strong controllability of reaction conditions

Inactive Publication Date: 2012-08-15
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, these processes are too complicated, which limits the TiO 2 Application of photocatalyst

Method used

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  • Synthesis technique of {001}-surface-exposed visible light titanium dioxide nanosheet with oxygen vacancy
  • Synthesis technique of {001}-surface-exposed visible light titanium dioxide nanosheet with oxygen vacancy
  • Synthesis technique of {001}-surface-exposed visible light titanium dioxide nanosheet with oxygen vacancy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Dissolve butyl titanate and titanium tetrafluoride with a molar ratio of 1:2 in a mixed solution of 1.25mL 20wt% nitric acid aqueous solution and 25mL ethanol, age at 40°C for 48h to form a gel, and then put it into a In a supercritical reactor with 250mL of ethanol, age at 10MPa and 260°C for 2h for extraction, and finally collect the sample directly after the extraction cools down.

[0023] figure 1 This is the FESEM spectrum of the morphology of visible light titanium dioxide nanosheets with oxygen defects exposed on the {001} plane obtained in this example. It can be seen from the figure that the sample is a single crystal nanosheet.

[0024] figure 2 This is the TEM image of visible light titania nanosheets with oxygen defects exposed on the {001} surface obtained in this example. The size is about 200 nm and the thickness is about 10 nm. The electron diffraction of the sample shows that it has a single crystal structure.

[0025] image 3 The XRD pattern of vi...

Embodiment 2

[0028] The operation steps of Example 1 were repeated, except that in a supercritical reactor, aging was carried out at 270° C. for 2 h for extraction. The result was similar to that of Example 1, but the nanosheets became 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

[0030] The operation steps of Example 1 were repeated, except that in a supercritical reactor, aging was carried out at 280° C. for 2 h for extraction. The result was similar to that of Example 1, but the nanosheets became 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 technique of a {001}-surface-exposed visible light titanium dioxide nanosheet with oxygen vacancy. The raw material proportion, aging time and temperature and supercritical extraction conditions are controlled to obtain a titanium dioxide nanosheet with favorable degree of crystallization and obvious single-crystal diffraction, wherein the particle sizes are uniform (50-200nm), and the thickness of the nanosheet is 10-20nm. The invention has the advantages of simple preparation process, strong reaction condition controllability and short synthesis time, does not need to introduce other composite semiconductors or dope visible-light-responsive elements in the synthesis process, and does not need treatment after the reaction; and the prepared product has potential application value in the fields of environmental treatment, hydrogen generation by photolyzing water, dye-sensitized solar cells, photoelectric materials and the like.

Description

technical field [0001] The invention relates to the field of photocatalysts, in particular to a synthesis process of visible-light titanium dioxide nanosheets with oxygen defects exposed on {001} planes. 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 the anatase titanium dioxide crystal, the reactivity of the {001} high-energy crystal plane is higher than that of the {101} crystal plane, and the currently synthesized titanium dioxide is mainly...

Claims

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Application Information

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IPC IPC(8): B01J21/06
Inventor 李和兴张鹏朱建李贵生
Owner SHANGHAI NORMAL UNIVERSITY
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