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Ultrafast preparation method of N and Ti<3+> codoped porous TiO2 nanosheet

A nanosheet and co-doping technology, applied in the direction of nanotechnology, titanium oxide/hydroxide, titanium dioxide, etc., can solve the problems of high temperature and long time required, and achieve short time consumption and fast deflagration reaction rate , the effect of reducing the cost of preparation

Active Publication Date: 2017-07-18
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] These N and Ti 3+ The methods of doping all have the disadvantages of high temperature and long time required, and it is necessary to achieve N and Ti 3+ The co-doping and adjustable concentration generally require two-step treatment with nitrogen precursor and reducing component, respectively.

Method used

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  • Ultrafast preparation method of N and Ti&lt;3+&gt; codoped porous TiO2 nanosheet
  • Ultrafast preparation method of N and Ti&lt;3+&gt; codoped porous TiO2 nanosheet
  • Ultrafast preparation method of N and Ti&lt;3+&gt; codoped porous TiO2 nanosheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1 g TiO at room temperature 2 Nanosheets and 0.2g NaN 3 Add the powder into 5mL deionized water, stir it with magnetic force to make it evenly mixed, pour it slowly into an ark filled with liquid nitrogen and freeze it quickly, and place it in a closed explosive device after freeze-drying; use electric ignition or heating to trigger Deflagration reaction, collect the obtained product after the reaction, wash it repeatedly with deionized water, and get N, Ti 3+ Co-doped porous TiO 2 Nanosheets.

Embodiment 2

[0040] 1 g TiO at room temperature 2 Nanosheets and 0.1 g NaN 3 The powder was added to 5 mL of deionized water, stirred evenly by magnetic force, slowly poured into an ark filled with liquid nitrogen and quickly frozen, and placed in a closed explosive device after freeze-drying; other steps were the same as in Example 1.

Embodiment 3

[0042] 1 g TiO at room temperature 2 Nanosheets and 0.3g NaN 3 The powder was added to 5 mL of deionized water, stirred evenly by magnetic force, slowly poured into an ark filled with liquid nitrogen and quickly frozen, and placed in a closed explosive device after freeze-drying; other steps were the same as in Example 1.

[0043] The N, Ti that embodiment 1~3 prepares 3+ Co-doped porous TiO 2 Nanosheets and Raw TiO 2 Nanosheets were analyzed and compared. The result is as Figure 2-8 shown.

[0044] Among them, from figure 2 It can be seen in the XRD pattern of NaN 3 After the deflagration treatment, the diffraction peaks of the samples prepared in Examples 1-3 did not change significantly, and they were all anatase phase TiO 2 (JCPDS Card21-1272), stating NaN 3 Deflagration treatment did not produce impurities.

[0045] from image 3 It can be seen in the Raman spectrum that the N, Ti prepared in Examples 1-3 3+ Co-doped porous TiO 2 The Raman peak of the nanos...

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Abstract

The invention discloses an ultrafast preparation method of an N and Ti<3+> codoped porous TiO2 nanosheet. The ultrafast preparation method is characterized in that a preparation of the N and Ti<3+> codoped porous TiO2 nanosheet is realized by using a deflagration reaction of NaN3 and comprises the following steps: firstly, adding the TiO2 nanosheet and the NaN3 with certain mass proportions into deionized water, uniformly stirring, then slowly introducing a mixture into liquid nitrogen, enabling the mixture to be quickly frozen, carrying out freeze drying and subsequently putting the mixture into a closed bomb vessel; secondly, initiating the NaN3 in the closed bomb vessel for carrying out the deflagration reaction by adopting an electric ignition mode or a heating mode; after the reaction is ended, collecting products, washing with the deionized water and drying to obtain the N and Ti<3+> codoped porous TiO2 nanosheet. The preparation method disclosed by the invention has the advantages of simple conditions, self-sustaining heat release, no need of complex equipment, extremely-high rate of the deflagration reaction and extremely-short consumed time. Therefore, the preparation cost is greatly reduced, the preparation period is shortened, and industrial scale production can be realized.

Description

technical field [0001] The invention relates to the field of photoelectric semiconductor materials, a kind of N, Ti 3+ Co-doped porous TiO 2 Ultrafast method for the preparation of nanosheets. Background technique [0002] TiO 2 Semiconductor compounds have attracted widespread attention in the fields of photoelectric conversion and photocatalysis due to their good stability. But its wide forbidden band width (E g =3.0-3.2eV) determines the TiO 2 Materials can only undergo photoelectric conversion and photocatalysis under the irradiation of ultraviolet light. This part of light energy only accounts for 3 to 4% of the total energy in solar energy, and it is a pity that visible light, which accounts for more than 40% of the total energy of sunlight, cannot be used. . By doping N element can be in TiO 2 A new valence band energy level is formed above the valence band (N 2p ), Ti 3+ Doping can form a transition energy level below the conduction band, which can effective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047B82Y40/00
CPCC01G23/08C01P2002/72C01P2002/82C01P2002/84C01P2002/85C01P2002/86C01P2004/04C01P2004/22C01P2004/80
Inventor 杨光成刘有松杨云涛李小东李瑞
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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