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Method for preparing titanium dioxide nanometer material with exposed nonmetal-metal co-doped (001) surface

A technology of nanomaterials and metal doping, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., to achieve the effects of improved transfer efficiency, easy control of the preparation process, and improved degradation efficiency

Inactive Publication Date: 2012-10-10
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Disadvantages: The particle size of TiN, TiC or TiS2 is too large, and the non-metal doped (001) surface exposed TiO2 prepared by hydrothermal reaction is submicron Particles or flakes, which have a great influence on its photocatalytic performance
[0006] However, due to the high degree of crystallinity of the TiO2 nanostructure, it is difficult to incorporate metal ions into TiO2 by chemical means sub>lattice; at the same time, metal ion precursors will largely affect the nucleation and growth of (001) facet exposed TiO2 nanostructures
Therefore, the preparation conditions for non-metal-metal co-doped (001) surface exposed TiO2 nanostructures are extremely harsh, and it is difficult to achieve controllable preparation. So far, metal-doped and non-metal-metal co-doped (001 ) surface exposed TiO2 nanostructures have not been reported

Method used

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  • Method for preparing titanium dioxide nanometer material with exposed nonmetal-metal co-doped (001) surface
  • Method for preparing titanium dioxide nanometer material with exposed nonmetal-metal co-doped (001) surface
  • Method for preparing titanium dioxide nanometer material with exposed nonmetal-metal co-doped (001) surface

Examples

Experimental program
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Embodiment 1

[0031] 1) Add 1 g of titanium dioxide, 0.1 g of ferric nitrate, 0.1 g of ammonium fluoride and 40 mL of 5 mol / L sodium hydroxide solution into the hydrothermal reaction kettle and stir well. Then it was hydrothermally reacted at 110 °C for 24 hours, and then the reaction product was acid-washed, washed with water, and dried to obtain N+Fe co-doped H 2 Ti 3 o 7 nanomaterials. ，

[0032] 2) Take 1 g N+Fe co-doped H 2 Ti 3 o 7 Nanomaterials, 0.6 ml of hydrofluoric acid with a concentration of 0.96mol / L was added to the hydrothermal reaction kettle, and the hydrothermal reaction was carried out at 150 °C for 10 hours, and then the reaction products were washed with water and dried to obtain +Fe co-doped (001) facet exposed TiO2 nanomaterials.

[0033] figure 1 Shown is the N+Fe co-doped (001) surface exposed TiO prepared in Example 1 2 Anatase phase TiO prepared by nanomaterials and comparative examples 2 The X-ray diffraction (XRD) comparison chart of nanoparticles, as...

Embodiment 2

[0035]1) Take 5 g of titanium dioxide, 5 g of chromium chloride, 5 g of ammonium fluoride and 40 mL of 10 mol / L sodium hydroxide solution into the hydrothermal reaction kettle and stir well. Then it was subjected to a hydrothermal reaction at a temperature of 150 °C for 48 hours, and then the reaction product was acid-washed, washed with water, and dried in sequence to obtain N+Cr co-doped H 2 Ti 3 o 7 nanomaterials. ，

[0036] 2) Take 1 g N+Cr co-doped H 2 Ti 3 o 7 Nanomaterials, 1.2 ml of hydrofluoric acid with a concentration of 1.92 mol / L was added to the hydrothermal reaction kettle, and the hydrothermal reaction was carried out at 200 ° C for 18 hours, and then the reaction product was washed with water in sequence and dried to obtain N+Cr co-doped (001) facet exposed TiO2 nanomaterials.

[0037] figure 2 Shown is the N+Cr co-doped (001) surface exposed TiO prepared in Example 2 2 High-resolution transmission electron microscope (HRTEM) image of nanomaterials. ...

Embodiment 3

[0039] 1) Take 10 g of titanium dioxide, 1 g of nickel nitrate, 1 g of ammonium fluoride and 40 mL of 15 mol / L sodium hydroxide solution into the hydrothermal reaction kettle and stir well. Then it was subjected to hydrothermal reaction at 130 °C for 72 hours, and then the reaction product was acid-washed, washed with water, and dried in sequence to obtain N+Ni co-doped H 2 Ti 3 o 7 nanomaterials. ，

[0040] 2) Take 1 g N+Ni co-doped H 2 Ti 3 o 7 Nanomaterials, 2.4 ml of hydrofluoric acid with a concentration of 3.84mol / L was added to the hydrothermal reaction kettle, and the hydrothermal reaction was carried out at 180 °C for 24 hours, and then the reaction product was washed with water and dried to obtain +Ni co-doped (001) facet exposed TiO2 nanomaterials.

[0041] image 3 Shown is the high-resolution transmission electron microscope (HRTEM) image of the N+Ni co-doped (001) surface exposed TiO2 nanomaterial prepared in Example 3. It can be seen from the figure that...

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Abstract

The invention relates to a method for preparing a TiO2 nanometer material with an exposed nonmetal-metal co-doped (001) surface. The method includes synthesizing a nonmetal-metal co-doped H2Ti3O7 nanometer material by a hydrothermal method; and using the H2Ti3O7 nanometer material as a titanium source, adding a defined amount of hydrofluoric acid into the titanium source in a second hydrothermal synthesis process, and finally preparing the TiO2 nanometer material with the exposed nonmetal-metal co-doped (001) surface. The method is simple in process, a preparation process is controlled easily, production efficiency is high, and actual application of nanometer TiO2 is greatly promoted. Compared with an anatase TiO2 nanometer material, the prepared TiO2 nanometer material with the exposed nonmetal-metal co-doped (001) surface has the advantages that visible light absorption efficiency, photon-generated carrier transfer efficiency and photoelectrochemical reaction efficiency are obviously improved, and the TiO2 nanometer material with the exposed nonmetal-metal co-doped (001) surface has an excellent application prospect in photocatalytic environmental management, dye-sensitized solar cells, harmful gas monitoring and the like.

Description

technical field [0001] The invention relates to a preparation method of a titanium dioxide nanometer material, in particular to a preparation method of a nonmetal-metal co-doped (001) surface exposed titanium dioxide nanometer material. Background technique [0002] With the development of nano-science and technology, nano-semiconductor materials have been widely used in various fields such as environmental protection and new energy materials. Nano-TiO 2 Due to the fact that no photocorrosion occurs after illumination, good acid and alkali resistance, stable chemical properties, non-toxic to organisms, rich sources, high potential points for generating photogenerated electrons and holes, and strong redox performance and other excellent characteristics, It has broad application prospects in the fields of photocatalytic purification, dye-sensitized solar cells, and harmful gas monitoring. Theoretical and experimental studies in recent years have proved that TiO with (001)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
Inventor 潘春旭张豫鹏
Owner WUHAN UNIV
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