Preparation method of ultra-thin titanium dioxide nanosheet

A technology of titanium dioxide and nanosheets, which is applied in the field of ultra-thin single crystal titanium dioxide nanosheets, can solve the problems of large particles, and achieve the effects of simple preparation process, high ratio and strong reactivity

Inactive Publication Date: 2011-04-13
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Yang (Yang) et al (Anatase TiO 2 single crystals with a large percentage of reactive facets. Nature. 2008.453, 638-641) synthesized TiO with exposed high active facets for the first time 2 Particles, but larger (micron scale), followed by Yang et al. (Solvothermal Synthesis and Photoreactivity of Anatase TiO 2 Nanosheets with Dominant{001}Facets.J.Am.Chem.Soc.2009.131:4078-4083) prepared TiO with sheet-like structure 2 Particles, although the ratio of highly active surface to surface area has been greatly improved, but the particle size is still greater than 100 nm

Method used

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  • Preparation method of ultra-thin titanium dioxide nanosheet
  • Preparation method of ultra-thin titanium dioxide nanosheet
  • Preparation method of ultra-thin titanium dioxide nanosheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Inject 25ml of n-butyl titanate and 4.0ml of hydrofluoric acid into a 50ml polytetrafluoroethylene reactor sequentially, put them in a stainless steel container, press tightly, seal, and keep at 170°C for 20h. After the reaction, the supernatant was removed, and the white or blue product at the bottom was washed with alcohol several times, washed with water, and then vacuum-dried for 12 hours to obtain the target product. Picture 1-1 with Figure 1-2 It is a transmission electron microscope photo of the target product. It can be seen that titanium dioxide is a sheet structure, mainly rectangular and square, with a thickness of 4.4nm. Depend on Figure 1-3 It can be seen that the flaky titanium dioxide is anatase.

Embodiment 2

[0032]Inject 25ml of n-butyl titanate and 3.0ml of hydrofluoric acid into a 50ml polytetrafluoroethylene reactor sequentially, put them in a stainless steel container, press tightly, seal, and keep at 170°C for 20h. After the reaction, the supernatant was removed, and the white or blue product at the bottom was washed with alcohol several times, washed with water, and then vacuum-dried for 12 hours to obtain the target product. diagram 2-1 with Figure 2-2 It is a transmission electron microscope photo of the target product. It can be seen that the titanium dioxide is a sheet structure, mainly rectangular and square, with a small amount of irregular shape, and the thickness is 3.2nm.

Embodiment 3

[0034] Inject 25ml of n-butyl titanate and 3.0ml of hydrofluoric acid into a 50ml polytetrafluoroethylene reactor in sequence, put them in a stainless steel container, press tightly, seal, and keep at 160°C for 20h. After the reaction, the supernatant was removed, and the white or blue product at the bottom was washed with alcohol several times, washed with water, and then vacuum-dried for 12 hours to obtain the target product. Figure 3-1 with Figure 3-2 It is a transmission electron microscope photo of the target product. It can be seen that titanium dioxide is a sheet structure, mainly rectangular and square, with an increase in the number of irregularly shaped nanosheets compared to Example 2, and a thickness of 2.5nm.

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Abstract

The invention relates to a preparation method of an ultra-thin titanium dioxide nanosheet. The ultra-thin titanium dioxide nanosheet is synchronized by using a wet chemical method. The synchronized titanium dioxide nanosheet is of an anatase titanium type and mainly square, rectangular and other irregular shapes, and the thickness of the ultra-thin titanium dioxide nanosheet in the [001] crystallographic orientation is 0.5-5.0 nanometers; and (001) crystal surfaces with high reactivity are arranged on the upper bottom surface and the lower bottom surface of the ultra-thin titanium dioxide nanosheet. The titanium dioxide nanosheet with the structure has important application in the fields of environmental science and new energy.

Description

technical field [0001] The invention relates to a titanium dioxide nanometer material, especially an ultra-thin single-crystal titanium dioxide nanosheet with a high-reactivity surface. This product has very important uses in the fields of environmental protection and clean energy. Background technique [0002] Before the limited fossil energy is gradually exhausted, the research on new alternative energy has become imminent, and has already attracted great attention from governments all over the world. Solar energy is an inexhaustible, renewable and clean energy that does not produce any environmental pollution. The new solar photocatalytic hydrogen production system is an important content of current solar energy utilization research. As a clean energy, hydrogen has the advantages of high calorific value, no pollution to the environment, and direct conversion from chemical energy to electrical energy (fuel cell), etc., and has attracted more and more attention from researc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B82B3/00
Inventor 杨化桂杨晓华
Owner EAST CHINA UNIV OF SCI & TECH
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